{"uid":"cap_RyIjJhjEJXWkfofokFRc6","slug":"underground-substrate-symposium-merchant-key-attestation-2d63f9f3","name":"Underground Substrate Symposium Merchant Key Attestation","description":"x402 conformance verification for wallet developers. Pay $1.00 USDC on Base or Solana; receive an Ed25519-signed attestation that your client completed a real 402→auth→settle→deliver cycle on production infrastructure. Includes @maraventano/map decoder source (src/read.js) inline for URL parsing in future transactions. Use in CI pipelines, before SDK releases, or as agent-to-agent trust anchor.","url":"https://underground.substratesymposium.com/api/merchant-key?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"1","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":"$1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_DCyYIOn7bhVKF0WHbXgKr","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a signed Ed25519 attestation certifying a wallet and merchant key for x402 protocol conformance","exampleAgentPrompt":"Get me a signed Ed25519 attestation from the Underground Substrate Symposium that certifies my wallet and merchant key are fully x402 conformant.","exampleUseCases":[{"title":"Verify x402 compliance for payment gateway","prompt":"I need to prove to our payment processor that our wallet setup fully supports the x402 protocol—can you get us a signed attestation from the Underground Substrate Symposium?"},{"title":"Certify merchant key for third-party integration","prompt":"We're integrating with a partner platform that requires cryptographic proof of x402 conformance. Can you grab a signed Ed25519 attestation certifying our merchant key?"},{"title":"Audit wallet compliance before production launch","prompt":"Before we go live with our payment system, I want to get a signed attestation from Underground Substrate Symposium confirming our wallet and merchant key meet x402 standards end-to-end."}],"resultDescription":"A signed Ed25519 attestation confirming end-to-end x402 conformance for the calling wallet and merchant key, along with inline source for the @maraventano/map decoder.","failureModes":["Payment not received — returns 402 if $1 USDC is not provided","Invalid wallet or merchant key — attestation cannot be generated","Network or service unavailability — endpoint unreachable","Malformed GET request — missing required method or type fields"],"whenToPreferThis":"Use this endpoint when you need a cryptographically signed Ed25519 attestation proving that a wallet and merchant key are fully conformant with the x402 payment protocol, particularly when integration verification or third-party proof of x402 compliance is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T18:50:19.025Z","isFirstParty":false,"canonicalSlug":"underground-substrate-symposium-merchant-key-attestation-2d63f9f3"}