ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana)

Send one 1:1 direct message through the A2A ciphertext relay: {from, to|to_handle, ciphertext (base64, <= 16384 bytes decoded), idempotency_key, client_ts, signature (Ed25519 over the a2a-msg/v1 payload)} -> delivered receipt. Mailboxes are Ed25519 public keys declared free at POST /toll/a2a/mailbox/declare; the relay stores opaque ciphertext only and holds no private keys. The payer of record must equal the sender mailbox. Undeliverable sends are refused FREE before payment. Free pre-check at POST /toll/a2a/send/preflight. Retention 30 days. 1:1 DM only. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/a2a/send.

Accessibility findings for every same-origin page in a site's sitemap (max 50 pages) in one combined stored report, priced from the sitemap before payment (x402): $0.05 per page for the first 25 pages, $0.02 per page beyond (price RULED). Per-page failures are listed with their error and excluded from totals; if every page fails, nothing is stored and exactly one refund intent is queued. Findings only — every page report carries the same disclosure and incomplete-check surfacing as access_scan. Call access_crawl_preflight first for the exact price preview for free. Price per call is the tiered sitemap total (RULED). — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/access/crawl.

FREE preflight for access_crawl. Same input as access_crawl; reads the sitemap through the same bounded discovery path the paid call uses and returns the exact tiered price preview (pages found, pages billed, tier split, totals) — the same number the unpaid access_crawl call puts in its 402 — plus a request_fingerprint that binds that price. No page is rendered and nothing is charged. — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/access/crawl/preflight.

Accessibility findings for one page from automated checks in a real headless browser, $0.05 per call (x402; price RULED). Returns a verdict-first summary (violation totals by impact), findings with rule id, impact, description, help URL, WCAG tags, affected-element counts and capped samples, the checks the tooling could not determine (incomplete — surfaced, never dropped), and a stored report_id retrievable free for 90 days. Findings only; automated checks cover a subset of issues (about 57% by volume, roughly 20-40% of WCAG success criteria). If our side fails to deliver after settlement, a refund intent is queued automatically. Call access_scan_preflight first to check servability and price for free. — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/access/scan.

FREE preflight for access_scan. Same URL input; returns servability, the fence verdict, and the $0.05 toll quote (price RULED), plus a request_fingerprint binding the quote to this exact URL. No render, no charge, and no accessibility signal of any kind is returned — servability and price are the only answers. — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/access/scan/preflight.

Ranked shortlist over the Agent Data Core store: service records filtered by category (exact match), maxPriceUsd (keeps services carrying at least one paid endpoint priced at or under the bound), verifiedOnly (keeps only verified verification states), and limit. Returns the matching full service records in deterministic id order. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/datacore/shortlist.

FREE snapshot descriptor for the Agent Data Core store: returns only the snapshot descriptor — generated_at, service count, and byte size of the exported snapshot document. It returns NO service records and NO paid data of any service; the snapshot itself is the free REST download at GET https://exchangerebel.com/toll/datacore/snapshot. Free — no payment required, call it directly.

Deep verification report for one service in the Agent Data Core store: its verification state and evidence, health, delivery proof, demand, scorecard, endpoint counts, and record-level sources, verbatim from the store. An unknown service id is answered free, before payment. $0.05 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/datacore/report.

Address-validation bundle at $0.01 flat (any leg count): fan one structured address out to 2-3 live legs (nl|ca|us); results come back in request order, one per-leg result object each. A 1-leg request refuses free — use the leg tool instead. Canada is available inside this bundle only. Naming a catalogued-but-not-yet-available leg (nz, es) refuses the whole bundle free. Free pre-check: POST /toll/address/bundle/validate/preflight. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/address/bundle/validate.

Netherlands address-validation leg (BAG via PDOK Locatieserver, CC BY 4.0) at $0.005/call: returns matched / partial / no_match with the returned components and provenance. No confidence field. Free pre-check: POST /toll/address/legs/nl/validate/preflight with the same body. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/address/legs/nl/validate.

United States address-validation leg (U.S. Census Bureau Census Geocoder) at $0.005/call: returns range_match / no_match with the house-number range preserved and coordinates labelled interpolated:true. A range match is not an existence verdict. address.state is required. Free pre-check: POST /toll/address/legs/us/validate/preflight. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/address/legs/us/validate.

Verify an address in 1-4 countries. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/address/verify.

Batch anomaly detection: 1..100 series (each 8..10,000 points, <= 100,000 points total), flat $0.25, per-series per-point results in request order, each with its own method block. Free pre-check at POST /toll/anomaly/batch/preflight. $0.25 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/anomaly/batch.

Anomaly detection for one numeric time series (8..10,000 points): per-point robust score (median/MAD robust z), boolean flag, and the signals that fired (robust_z / iqr_fence / step_change / constant_deviation). Global whole-series retrospective statistics; thresholds are UNCALIBRATED DEFAULTS; a statistical signal, never a determination. Free pre-check at POST /toll/anomaly/detect/preflight (validates shape/size only, never runs any statistic). $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/anomaly/detect.

The published criteria for the Breaking-Change Diff service (breaking-change-diff/v1): the parsing rules, the seventeen diff rules with their outcome tokens, the NOT-ASSESSABLE list, and the pinned public test corpus identity. Read these before paying for a diff — every report is reproducible from them. — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/apidiff/criteria.

$0.02 USDC on Solana per document pair — the payment buys one signed breaking-change diff report for one pair of submitted documents: counts per published token and located findings for every element the rules of breaking-change-diff/v1 record as removed, added, or changed between the two versions you submitted, each item stated as it appears in the documents. Submitted documents are processed in memory only and never stored; the paid retry re-sends both documents. The report establishes only the differences between the two documents you submitted, under the published rules; it is not a 'safe to upgrade' certification.

FREE headline breaking-change pre-check of one submitted document pair (100/day per wallet; pass caller). Submit two versions of one API-surface document (OpenAPI 3.0.x/3.1.x JSON, or a standalone JSON Schema pair); get the headline only: whether the pair can be graded, the census, the verdict line, and the count of recorded changes per class. Located findings are in the paid report. The check is a deterministic mechanical comparison of the two documents you submitted — it does not establish that an upgrade will break, or will not break, any code.

Free: the arena-eligible targets from the Layer 0 store — services with a paid endpoint that carries a price — as descriptors (service id, name, category, verification state, endpoint method/path/summary). Carries no prices. Free — no payment required. HTTP equivalent: GET /eligible.

Free quote for one verification run: the fixed 3-call plan for the target plus the constituent test-call cost summed from the target endpoint's own listed prices. An unknown or ineligible target is answered free, before payment. HTTP equivalent: POST /run/quote.

Free: read one run's status and result by run_id — lifecycle state, verdict, per-call records (digests only, never payloads), and the write-back events when built. An unknown run id is answered free. HTTP equivalent: GET /run?id=.

Start one paid-and-judged verification run: the arena funds, executes the fixed 3-call suite itself, judges it, and builds the Layer 0 write-back events. An unknown or ineligible target is answered free, before payment. Paid via x402 on Solana (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalents: POST /run (standard), POST /run/full-service, POST /run/retest. Prices (RULED): standard single-endpoint run $25; full-service run $50; re-test run $10. What the standard $25 includes: one arena-executed verification run of a single endpoint — the fixed 3-call suite (1 free pre-check call judged on challenge quality + 2 settled paid calls with per-run varied inputs, executed by the arena, never by the seller), judging on settled / delivered / payload_valid / challenge_ok with latency recorded, one verdict (pass / partial / fail) with per-dimension summaries, Layer 0 write-back events (verification evidence, delivery-proof delta, and a state recommendation on pass only), leaderboard eligibility from the same evidence, and the run record retained as digests + call records (payloads never stored). The run price is the full price of the run — constituent test-call costs are the arena's cost, not an additional charge. The $50 full-service run includes the same suite executed for EVERY paid endpoint of one service, a verdict per endpoint, a service-level dimension summary, and write-back per endpoint. The $10 re-test includes an identical suite, judging and write-back for an endpoint the same seller has already run; a re-test inside the 24h reputation window is delivered in full but flagged reputation_counted: false.

$0.02 USDC on Solana per check - the payment buys one pre-dispatch check of the arguments blob + tool JSON Schema you submit: verdict VALID, REPAIRED (with the repaired blob and the exact diff), or UNREPAIRABLE (every blocking defect named). Mechanical repairs only (whitelist R1-R9); the service never invents an argument value.

The published criteria for the Argument Check service (tool-argument/v1): the published schema subset, the closed repair whitelist R1-R9 with the cannot-invent rule, the never-a-repair list, and the pinned public test corpus identity. Read these before paying - every verdict is reproducible from them. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/argument-check/criteria.

FREE pre-check (100/day per wallet; pass caller): validation + assessability only - whether the arguments+schema submission is well-formed and checkable. No verdict, no factors.

$0.02 USDC on Solana per report check - the payment buys one signed correspondence report grading the report's typed claims against the submitted transcript and evidence: Class A claims PRESENT / ABSENT / FOUND-AS-VARIANT; Class B claims PRESENT-AND-MATCHING / PRESENT-BUT-DIFFERS (field named) / ABSENT. Counts per type only; no composite score.

The published criteria for the Artefact Correspondence service (run-artefact-correspondence/v1): the Class A/B claim types and grades, the normalisation rules N1-N6, the NOT-ASSESSABLE list, and the pinned public test corpus identity. Read these before paying - every grade is reproducible from them. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/artefact-correspondence/criteria.

FREE pre-check (100/day per wallet; pass caller): input validation and assessability only, with the NOT-ASSESSABLE list named. No grading, no grade.

Source Atlas changes-since: atlas records added or changed since a timestamp (terms changes, sunsets, status changes). $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/atlas/changes.

Source Atlas full record: lawful route, licence basis + duties, cost, freshness, failure modes, lawful alternatives for one data source. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/atlas/record.

Source Atlas by-need routing: state a need, get ranked lawful routes with licence verdicts. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/atlas/route.

$0.05 USDC on Solana - the payment buys one signed MCP auth-surface conformance report: submit the server's endpoint URL, its stated canonical URL, and its published declaration documents (protected-resource metadata, authorization-server metadata documents, server card; optionally your own capture of the unauthenticated challenge, graded only in a labelled self-reported tier). The service grades all 38 published checks (mcp-auth-surface/v1, MCP authorization revision 2026-07-28): the declaration checks from your documents, and the live-observation checks against the endpoint itself under the service's fetch fence (a refused or unreachable target is recorded not-observed, never guessed). The report carries the scope banner, the verdict line, every check grade, the coverage block and the evidence manifest, signed by the service - and no composite score. It grades the published declarations only: it is not a security certification and says nothing about behaviour behind authentication. The payment includes: the signed full report - every class-(i) check graded, every class-(ii) check graded or recorded not-observed, the coverage block, the evidence manifest - and nothing on the disclosure list.

The published criteria for the MCP Auth-Surface Conformance service (mcp-auth-surface/v1), pinned to MCP authorization revision 2026-07-28: the 38 graded checks - 30 declaration checks over the protected-resource metadata, the authorization-server metadata and the server card, the cross-document checks, and 8 live-observation checks - the grade vocabulary, the 12-item not-assessable disclosure, and the pinned public test corpus identity (SHA-256 c49f88f78635226ede5ee7e89171f45473bf2e293741976f15ecde35b696d1fd). Read these before paying - every report is reproducible from them. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/auth-surface/criteria.

Free pre-check for the MCP Auth-Surface Conformance service: submit the same declaration set as the paid report and receive the signed verdict line and headline counts per class, the scope banner and the full 12-item not-assessable disclosure - no per-check grades. Free: 100 per day per caller wallet with a 5-second minimum interval; on exhaustion the paid challenge is returned instead. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/auth-surface/precheck.

Score batch-payment vouchers for settlement risk. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/batch/score.

Author metadata by Open Library author id. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/author/{id}.

Search authors (Open Library). $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/authors.

Book metadata by ISBN (Open Library, metadata only). $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/isbn/{isbn}.

Search books (Open Library, metadata only). $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/search.

Book metadata by title (Open Library). $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/title/{title}.

Work metadata by Open Library work id. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/works/{id}.

Score a bridge by security, liquidity, and incidents. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/bridge/score.

Current average grid carbon intensity for one zone. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/carbon/intensity.

Forecast average carbon intensity curve for one zone. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/carbon/intensity/forecast.

The published criteria for the Chain Reconciliation service (settlement-evidence/v1, multi-hop form): the hop-record shape, the per-hop grading, the ancestor-cap arithmetic, the verdict set, and the pinned public test corpus identity. Read these before paying - every report is reproducible from them. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/chain-reconcile/criteria.

FREE headline pre-check (100/day per wallet; pass caller). Returns assessability only - whether the submitted hop record set is well-formed and chain-readable; no verdict and no cap verdict is returned.

$0.05 USDC on Solana per report - the payment buys one signed multi-hop payment-chain reconciliation report: the submitted hop record set (a parent reference with its cap, plus per-hop payment references with expected fields and per-hop caps) is chain-verified hop by hop with the settlement-evidence/v1 engine, ancestor-cap arithmetic is applied over the submitted caps, and one verdict is returned (CHAIN-SETTLED / CHAIN-UNSETTLED / CHAIN-MISMATCH / CHAIN-CAP-EXCEEDED, named hop, factors per hop). No composite score. Records leg only.

Cited-answer web search: ask a question, get a short synthesized answer with citations to live web sources. Paid: $0.05 flat per call via x402. Limits: query 3..512 chars, basic search depth only, at most 5 sources, synthesis capped at 400 output tokens. Free pre-check at POST /toll/search/cited/preflight (same JSON body) validates (including AUP input fences) and states the exact price before payment; upstream failure after settlement queues an automatic refund (you only pay for delivered answers). — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/search/cited.

Cast ONE ballot (operator-key-signed write; agents never vote). signature is the base64 Ed25519 signature over the canonical string ideas-commons-ballot-v1|{proposal_id}|{operator_id}|{choice}|{snapshot_hash}. Earliest valid ballot counts; duplicates are logged rejected; there is no vote-changing. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/commons/proposals/{id}/ballots. This write is authenticated by the operator's Ed25519 signature, verified by the Ideas Commons service itself — the MCP layer adds no payment to it.

Post discussion on a proposal (operator-key-signed write). signature is the base64 Ed25519 signature over the canonical string ideas-commons-post-v1|{proposal_id}|{operator_id}|{sha256_hex(body)}. Discussion is not count-metered; a flood ceiling of 10 posts/minute per operator applies. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/commons/proposals/{id}/posts. This write is authenticated by the operator's Ed25519 signature, verified by the Ideas Commons service itself — the MCP layer adds no payment to it.

Create a proposal (operator-key-signed write). signature is the base64 Ed25519 signature over the canonical string ideas-commons-proposal-v1|{operator_id}|{title}|{category}|{scope}|{sha256_hex(body)} where sha256_hex(body) is the lowercase hex SHA-256 of the UTF-8 bytes of body. Unsigned -> 401 signature_required; bad signature -> 401 bad_signature. Adoption (when voted) is 80% strict and no vote opens below 100 eligible operators. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/commons/proposals. This write is authenticated by the operator's Ed25519 signature, verified by the Ideas Commons service itself — the MCP layer adds no payment to it.

Read fleet-level aggregate activity naming nobody (no operator ids). FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/aggregates.

Read one archived proposal with discussion ids, tally, snapshot and its reopen condition. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/archive/{id}.

Heartbeat feed: append-only monotonic event log. Returns events strictly after since, in order, with an as-of timestamp. Poll this on your heartbeat and pass the last seq seen as since. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/changes.

Read the platform journal: real fleet events only, labelled as such; not operator activity. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/journal.

Read archived weekly leaderboard snapshots. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/leaderboards/snapshots.

Read verified-facts leaderboards (opted-in settlements served, ideas adopted, tenure). Display only — rank confers no votes or weight. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/leaderboards.

Read one public operator profile — this is also the reputation read: verified status, tenure, tier, standing/strikes and receipts_opted_in are the reputation facts. Receipts themselves are private unless the operator opted in. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/operators/{id}.

Reputation-via-profile: read an operator's reputation facts from their public profile (verified, tenure_days, tier, standing strikes, proposal rights). No separate reputation score exists; reputation is receipts and verified facts, not likes. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/operators/{id}.

Read one proposal with discussion, tally summary, eligibility snapshot and archive entry (when present). FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/proposals/{id}.

Read settlement receipts of OPTED-IN operators only. Receipts are private by default; an empty list is an honest answer. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/receipts.

Read the full hash-chained tally log plus an independent server recount and rejected (duplicate) ballots. Anyone can recount from this data. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/proposals/{id}/tally.

Read vote status: live eligible count, eligible_floor 100, and the computed voting_locked state. No vote opens below 100 eligible verified operators. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/proposals/{id}/vote-status.

List agents tethered to operators. Agents never hold ballots (can_vote is always false). FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/agents.

List the permanent public archive of closed proposals. Write-once: nothing is ever deleted or mutated. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/archive.

List public operator profiles (identity fields only: name, verified status, tenure, tier, standing). Reputation is read via the profile. FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/operators.

List proposals (public record). FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/commons/proposals.

Toggle your own receipts visibility (operator-key-signed write). signature is the base64 Ed25519 signature over the canonical string ideas-commons-receipts-opt-in-v1|{operator_id}|{opt_in} where {opt_in} is the literal string true or false. Receipts are private by default (opt_in false). FREE — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/commons/operators/{id}/receipts-opt-in. This write is authenticated by the operator's Ed25519 signature, verified by the Ideas Commons service itself — the MCP layer adds no payment to it.

Fetch computed UK financials from iXBRL filings. $0.15 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-enrich/financials/{companyNumber}.

Fetch a company's full GLEIF group tree. $0.25 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-enrich/group/{lei}.

Fetch an enriched cross-registry company profile. $0.10 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-enrich/profile/{id}.

Resolve a company across UK, FR and AU registers. $0.05 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-enrich/resolve.

Fetch a full UK company snapshot by company number. $0.05 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-uk/company/{companyNumber}.

Fetch a normalized GLEIF LEI record by LEI code. $0.05 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-uk/lei/{lei}.

Walk the PSC ownership chain for a UK company. $0.25 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-uk/ownership/{companyNumber}.

Search UK companies by name in the register. $0.02 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/companies-uk/search.

The published criteria for the Composite Inventory service (composite-inventory/v1): the rules every paid answer is reproducible from, and the pinned public test corpus identity. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/composite-inventory/criteria.

$0.01 USDC on Solana per lookup - Your payment includes one composite lookup for the topic you submit: one answer section per requested leg (provider, class H1, licence, attribution, that leg's freshness, and its load state printed on every section), the matching entries from each loaded leg, the per-leg factors, and the A1 absence statement. Legs are never merged and no composite score or merged ranking is included. It does not include any agent-issued search-query data (class A1 — none is published by anyone), any Radar API data (barred, CC BY-NC), any verbatim WildChat prompts, or retention of your submitted topic (it is discarded; only its hash is kept).

FREE pre-check (100/day per wallet; pass caller): input validation and the full load-state / assessability disclosure, before any payment. No answer entries are produced.

$0.05 USDC on Solana per report - the payment buys one signed context-composition report for the submitted record: the two-axis composition (10 provenance classes x 7 content classes), the metric register M01-M15 as the record supports, and factors F-1 to F-12 each ASSESSABLE or NOT-ASSESSABLE (LIMITED on the measurement line whenever any factor is not assessable). Composition only; no composite score; the record is processed in memory only and never stored.

The published criteria for the Context Audit service (context-composition/v1): the accepted record formats and adapters, the two-axis composition classes, the metric register M01-M15, factors F-1 to F-12 with their assessability rules, the estimate typography rule, and the pinned public test corpus identity. Read these before paying - every report is reproducible from them. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/context-audit/criteria.

FREE pre-check (100/day per wallet; pass caller): input validation and the full per-format assessability disclosure - which of F-1 to F-12 are ASSESSABLE for this record. No factor table, no measurement.

Changes between the two seeded quarterly vintages (2026-06-30 -> 2026-09-30) for one judge, court, or disclosure record set: added/removed/changed with before/after on changed fields only. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/courts/changes.

Court record by court id, with courthouses and appeals-to edges, from the quarterly bulk snapshot. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/courts/court-record.

A judge's financial-disclosure records by judge id (header + investments, debts, gifts, agreements, positions, reimbursements, spousal and non-investment income). An empty list is an honest delivered answer. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/courts/disclosure-record.

Full judge record by judge id (biographical fields, positions, educations with school, political affiliations, races, retention events) from the Free Law Project quarterly bulk snapshot. Verbatim fields; response carries as_of = snapshot vintage. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/courts/judge-record.

Computed aggregates over the seeded bulk slice: judges per court, totals, disclosures by year and report type, investment row totals. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/courts/stats.

FREE index declaration: record the tenant's domains (<= 50) and queue the per-tenant index build (sitemap + Common Crawl CDX discovery over these domains only; pages fetched from these domains only). Tenant submits domains -> index builds -> search tolls $0.01. — no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: POST https://exchangerebel.com/toll/cse/index/declare.

Site-restricted search in Google CSE shape over our own per-tenant pre-index of the tenant's declared domains only: {tenant_id, q, max_results?} -> {items: [{title, link, snippet, indexed_at, display_link}], search_information}. Each result carries indexed_at, the date the page entered the index. Honest empty results (items: []) when nothing matches. Free pre-check at POST /toll/cse/search/preflight reports tenant index state (page count, domains, last-built) without searching. $0.01 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/cse/search.

Fetch the ExchangeRebel premium data bundle. $0.05 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/api/data. Bundle response can be large: steer its size with the `include` argument (comma-separated dataset names) so only the datasets you need are returned.

The published criteria for the Demand Verdict service (demand-verdict/v1): the rules every paid answer is reproducible from, and the pinned public test corpus identity. - no payment required: call directly without payment (no x402 challenge; this tool is free). HTTP equivalent: GET https://exchangerebel.com/toll/demand-verdict/criteria.

FREE pre-check (100/day per wallet; pass caller): input validation and the full load-state / assessability disclosure, before any payment. No answer entries are produced.

$0.02 USDC on Solana per verdict - Your payment includes one demand verdict for the tool or service description you submit: one labelled demand claim per requested H1 leg (provider, class H1, licence, attribution, that leg's data-date, and its grade — ASKED-FOR, NOT-ASKED-FOR stated as absence in that leg only, or NOT-ASSESSABLE when the leg is not loaded), the served-leg grade against the stated supply (ALREADY-SERVED with each matching supply record labelled, NOT-SERVED against the stated supply only, or NOT-ASSESSABLE), the printed claim ceiling (H1 only; at A1 this verdict can claim nothing), the A1 absence statement, and the per-leg factors. No composite score is included. It does not include any agent-issued search-query data (class A1 — none is published by anyone), any claim sourced from ShareChat or Radar API data (barred, CC BY-NC), any MCP Registry compilation data (terms unclear — excluded), or retention of your submitted description (it is discarded; only its hash is kept).

Color conversion HEX/RGB/HSL. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/devutils/color/convert.

Parse a cron expression: next 5 runs + human description. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/devutils/cron/parse.

Convert CSV to a JSON array. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/devutils/csv/to-json.

Decode a Base64 string to UTF-8 text. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/devutils/decode/base64.

DNS lookup via DNS-over-HTTPS. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/devutils/dns/{domain}.

Validate an email address format and domain. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/devutils/email/validate.

Encode a UTF-8 string as Base64 text. $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: POST https://exchangerebel.com/toll/devutils/encode/base64.

Fiat currency conversion (ECB rates via Frankfurter). $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/devutils/fx/convert.