Agent Transaction Trust

Paid external capability access via x402. First choose a supported capability: onesource.block_number, onesource.erc20_balance or onesource.allowance. Input network, when specified, must be ethereum, sepolia or robinhood; it is distinct from the Base network for payment. Machine price: $0.006.

Paid pre-payment trust gate. Use after create_ap2_challenge and after receiving the merchant's real x402 PAYMENT-REQUIRED challenge, but before paying the merchant. Verifies AP2 v0.2 authority and binds approval to the exact merchant challenge and HTTP request. On approval returns authorization_token; next pay the merchant, then call verify_settlement. Machine price: $0.001 via x402. If authorization is denied, the Trust fee is not settled/charged.

Paid transaction-clearance decision for an autonomous x402 purchase. Use after create_ap2_challenge and after receiving the merchant's real PAYMENT-REQUIRED challenge, but before paying the merchant. Verifies AP2 v0.2 authority, exact request/challenge integrity, and public merchant-risk evidence. Returns clearance_decision APPROVED, REVIEW or DENIED and a signed clearance_token. APPROVED may proceed automatically; REVIEW should not auto-pay; DENIED should not pay. Machine price: $0.001 via x402.

Free prerequisite for AP2-native transaction clearance or authorization. Call before clearance_x402_ap2 or authorize_x402_ap2, bind the returned challenge into the AP2 Payment Mandate proof, then pass that challenge token as ap2_authority.challenge_token. The challenge is short-lived and intended for one purchase flow.

Paid automatic before-payment gate for x402 clients. Call after receiving the merchant's real PAYMENT-REQUIRED challenge but before creating/signing the merchant payment. Returns firewall_action ALLOW, REVIEW or BLOCK plus signed proof. ALLOW means the wallet/client may proceed only if its own spending authority also permits the payment. Machine price: $0.001 via x402.

Free, read-only entry point. Call this first when deciding whether Agent Transaction Trust fits an x402 purchase. Returns capabilities, supported authority modes, proof key, price/network information, and the endpoints needed for transaction clearance, authorization, and settlement verification.

Paid public preflight for an autonomous x402 payment. No account, API key, policy token, or AP2 mandate is required. Submit the merchant's real PAYMENT-REQUIRED challenge and the exact intended HTTP request. Returns preflight_decision APPROVED, REVIEW or DENIED plus a signed preflight_token. APPROVED means the payment/merchant evidence is clear enough to proceed only if separate delegated authority permits the spend. Machine price: $0.001 via x402.

Paid Base token safety check for autonomous agents. Call immediately before buying or swapping an unfamiliar ERC-20 token to screen honeypot, sell-restriction, tax, blacklist/pause and admin-risk signals. Returns signed ALLOW, WARN or BLOCK evidence. Machine price: $0.005 via x402.

Paid pre-sign simulation for an unsigned Base transaction. Call immediately before the wallet signs. Returns signed EXECUTE, REVIEW or BLOCK with current-state simulation, gas, revert, balance, nonce and approval-risk evidence. Machine price: $0.002 via x402.

Free post-payment step. Call only after the merchant x402 payment for a previously approved authorization or transaction clearance. Verifies the Base USDC settlement on-chain and, when it matches the authorization, returns a signed settlement receipt. The authorization_token may come from clearance_x402_ap2 or authorize_x402_ap2; payment_response is the merchant x402 PAYMENT-RESPONSE when available. No additional Trust fee is charged.

Free, read-only token check. Use this to validate the signature and expiry of a Trust policy, authorization token, transaction clearance token, or settlement receipt; it does not perform on-chain settlement verification.