{"uid":"cap_k-VQ-XJeBc5epm9nUMacG","slug":"salt19-commerce-receipt-verifier-80020292","name":"SALT19 Commerce Receipt Verifier","description":"SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.","url":"https://api.salt19.com/v1/commerce-receipt","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"policy":{"type":"object","properties":{"allowed_assets":{"type":"array","items":{"type":"string"},"maxItems":32},"allowed_payees":{"type":"array","items":{"type":"string"},"maxItems":64},"blocked_payees":{"type":"array","items":{"type":"string"},"maxItems":64},"allowed_networks":{"type":"array","items":{"type":"string"},"maxItems":32},"spend_24h_atomic":{"type":"string","pattern":"^[0-9]+$"},"max_amount_atomic":{"type":"string","pattern":"^[0-9]+$"},"max_per_day_atomic":{"type":"string","pattern":"^[0-9]+$"},"max_timeout_seconds":{"type":"integer","maximum":3600,"minimum":1}},"additionalProperties":false},"request":{"type":"object","required":["resource"],"properties":{"body":{},"method":{"type":"string","maxLength":16},"resource":{"type":"string","maxLength":2048,"minLength":1},"parameters":{"type":"object"},"content_type":{"type":"string","maxLength":128}},"additionalProperties":false},"delivery":{},"settlement":{"type":"object"},"payment_payload":{"type":"object"},"payment_required":{"type":"object","required":["x402Version","accepts"],"properties":{"accepts":{"type":"array","items":{"type":"object"},"maxItems":16,"minItems":1},"resource":{"type":"object"},"extensions":{"type":"object"},"x402Version":{"enum":[2],"type":"integer"}},"additionalProperties":true},"expected_delivery":{"type":"object","properties":{"expected_sha256":{"type":"string","pattern":"^[0-9a-fA-F]{64}$"},"required_fields":{"type":"array","items":{"type":"string"},"maxItems":64}},"additionalProperties":false},"target_salt19_operation_id":{"type":"string","maxLength":128,"minLength":8}}},"responseSchema":{"type":"json","example":{"receipt":{"id":"...","signing_key_id":"...","verification_url":"https://api.salt19.com/proof402/receipts/...","signature_algorithm":"Ed25519"},"verdict":"VERIFIED_LOCAL_EVIDENCE","commerce_root":"..."}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.04","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ZDeXe9m037cZ2v3VOTSLz","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies and issues a cryptographically signed receipt for an x402 micropayment transaction, confirming payment settlement and delivery against policy constraints.","exampleAgentPrompt":"After the x402 payment goes through for that API call, verify the settlement and get me a signed Ed25519 receipt from SALT19 — check the payment against my policy allowing only USDC on Base with a max of 1000000 atomic units, and use operation ID 'evomind-op-20240601' so I can audit it later.","exampleUseCases":[{"title":"Auditing agent micropayment compliance","prompt":"My AI agent just paid for a data lookup using x402 — can you verify the payment against my spend policy (max 500000 atomic units per transaction, USDC only, no blocked payees) and return a signed receipt I can store for compliance audits?"},{"title":"Confirming paid content delivery","prompt":"I paid for a file via x402 and got a payload back — verify the payment was legitimate, check the delivered content matches the expected SHA256 hash, and give me a SALT19-signed receipt proving I received what I paid for."},{"title":"Enforcing per-day spend limits for an agent fleet","prompt":"My agent fleet is making x402 payments autonomously — after each payment, validate it against a 24-hour rolling spend cap of 10000000 atomic units and issue a signed receipt so I can track every transaction's verification status."}],"resultDescription":"A JSON object containing a signed receipt with a unique receipt ID, a signing key ID, a verification URL (at api.salt19.com/proof402/receipts/), the signature algorithm (Ed25519), a verdict string (e.g. VERIFIED_LOCAL_EVIDENCE), and a commerce root hash attesting to the transaction.","failureModes":["Payment payload does not satisfy the provided policy (blocked payee, disallowed asset, or exceeded spend limit) — returns a rejection verdict","Invalid or malformed x402Version (only version 2 is accepted) — validation error","Expected SHA256 hash does not match delivered content — delivery verification failure","Target operation ID is missing or too short (minimum 8 characters) — schema validation error","Policy spend_24h_atomic or max_amount_atomic value is not a valid numeric string — request rejected","Accepts array in payment_required is empty or exceeds 16 items — schema constraint violation"],"whenToPreferThis":"Use this endpoint when you need a cryptographically signed, auditable receipt for an x402-protocol micropayment — especially when operating autonomous agents that must enforce spend policies, verify content delivery integrity via SHA256, or produce compliance records. Prefer this over generic payment webhooks or off-chain confirmations when you need Ed25519-attested proof with a publicly verifiable URL hosted by SALT19.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:50:39.669Z","isFirstParty":false}