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Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Payments & trading

NullClear Arbiter

By mithgalalfayez

Autonomous x402 payment schema-escrow arbiter, spend firewall, failover & ERC-8004 Sybil oracle

WebsiteSource codeFinance & payments
Connect to NullClear Arbiter
Checks passed
13 / 22

2 failed · 7 not measured

Median response
68 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
13

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Responded

The server completed its last measured handshake. This is an observation, not a guarantee.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
410
Reliability & speedDoes it respond consistently and quickly?
103
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
400
Publisher identityCan the publisher be traced to its source?
312

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 72 ms.

  • Pass
    Valid handshake

    protocolVersion 2024-11-05, serverInfo.name nullclear-mcp.

  • Pass
    Lists tools

    tools/list returned 13 tools.

  • Fail
    Current protocol

    Negotiated 2024-11-05. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 68 ms over 2 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 72 ms over 2 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    2 of 2 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Pass
    Stable tool list

    No tool was removed and no required parameter was added in the last 30 days.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Pass
    Parameters documented

    37 of 39 parameters have a description (95%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Not measured
    Website matches publisher

    This namespace is not a reverse domain, so the website comparison does not apply.

  • Pass
    Source repo linked

    A repository URL is on file.

  • Fail
    Repo owner matches

    The GitHub repository owner does not match the namespace login.

  • Pass
    Recently updated

    Updated 2026-10-16T01:05:08.244503Z, within 180 days.

  • Not measured
    Open-source licence

    The GitHub licence lookup has not returned an OSI result yet.

Start using NullClear Arbiter

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

claude mcp add --transport http nullclear-arbiter https://api.nullclear.dev/mcp

Capabilities

Tools 13

decode_calldata_or_failed_tx

[ZERO API KEY REQUIRED] Universal Calldata, Custom Revert Error & Failed Transaction Post-Mortem Decoder. Accepts raw hex calldata/revert bytes (0x...) OR a 66-char transaction hash (0x...), replays reverted transactions at their exact block, decodes 4-byte signatures & parameters, and flags malicious approvals (approve / permit / setApprovalForAll).

Discovered
inspect_contract_abi_and_proxy

[ZERO API KEY REQUIRED] Resolves EIP-1967, EIP-1822, and EIP-1167 proxy implementation addresses via eth_getStorageAt and extracts decoded 4-byte PUSH4 function selectors and dangerous opcodes (SELFDESTRUCT / DELEGATECALL) directly from on-chain bytecode without an Etherscan or Basescan API key.

Discovered
nullclear_check_reputation

Inspect an AI agent's trust score (0-100), clearing reliability, Sybil wash-trade penalty flags, and corporate KYA backing on Base

Discovered
nullclear_crypto_market_oracle

Fetch multi-exchange spread-verified crypto spot prices (ETH/USDC, BTC/USDC, SOL/USDC, BASE/USDC) with cryptographic NullClear invariant receipts. Works out-of-the-box with zero configuration (10 free daily calls included).

Discovered
nullclear_discover_verified_x402_apis

Search the live NullClear Ecosystem Directory for audited, high-uptime x402 & ERC-8004 APIs by topic/keyword, category, minimum uptime, or max latency. Automatically returns the NullClear-protected Zero-Loss Proxy URL ('https://api.nullclear.dev/https://...') for each endpoint.

Discovered
nullclear_escrow_x402_call

Execute an x402-gated HTTP API call through NullClear deferred schema escrow. Guarantees payment is only settled if upstream returns valid data matching your schema contract. Supports 10 free daily trial calls with zero wallet setup.

Discovered
nullclear_safe_fetch

Zero-config drop-in URL fetcher with automatic Canonical LLM Refusal Guard, HTTP 5xx crash guard, empty-JSON guard, and cryptographic execution receipt. Protects agents from hallucinated or broken API responses.

Discovered
nullclear_token_security_audit

Audit any Base ERC-20 token address for honeypot risk, buy/sell taxes, verified bytecode, and x402 compatibility via NullClear Bazaar. Works out-of-the-box with zero configuration (10 free daily calls included).

Discovered
nullclear_verify_kya_mandate

Verify an agent's Know Your Agent (KYA) corporate liability mandate, active validity, and whether a proposed transaction amount is within corporate limits

Discovered
nullclear_wallet_risk_score

Check any wallet or agent address on Base for OFAC sanctions, Sybil wash-trading concentration flags, and ERC-8004 counterparty reputation. Works out-of-the-box with zero configuration (10 free daily calls included).

Discovered
read_url_clean_markdown

[ZERO API KEY REQUIRED] Converts any public web URL or documentation page into clean, token-efficient Markdown (<400 tokens) with cryptographic SHA-256 provenance and zero HTML clutter.

Discovered
scan_token_forensics

[ZERO API KEY REQUIRED] Block-pinned on-chain security, EIP-1967/1822 proxy resolution, instruction-boundary opcode disassembly, honeypot, and buy/sell tax audit for Base, Ethereum (ETH), or Solana tokens. Includes cross-chain self-healing auto-detection and <400-token deterministic provenance receipt (100 free calls/day/IP).

Discovered
simulate_transaction_preflight

[ZERO API KEY REQUIRED] Pre-flight EVM transaction simulator. Dry-runs eth_call + eth_estimateGas on Base or Ethereum before signing/broadcasting, decodes any custom revert reason, detects unlimited drainer approvals, and outputs recommendedAgentAction ('EXECUTE_SAFE', 'ABORT_WILL_REVERT', or 'ABORT_DRAINER_APPROVAL').

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected72 ms13
Connected63 ms13

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