{"uid":"cap_MFPU6Ic-xI7OFRtcvW1RV","slug":"quantaflow-x402-api-gateway-frankfurter-proxy-57235e8b","name":"QuantaFlow x402 API Gateway — Frankfurter Proxy","description":"Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.","url":"https://quanta-roan.vercel.app/api/service/frankfurter?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"body":{"type":"string","description":"Optional JSON body forwarded to POST requests."},"path":{"type":"string","description":"Path below the selected upstream origin."},"query":{"type":"object"},"method":{"enum":["GET","POST"],"type":"string"}}},"responseSchema":{"description":"The upstream response body and content type are passed through after successful payment."},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_INUEsFAbEggod6Sm-nIal","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Proxies requests to the Frankfurter currency exchange rate API via the x402 micropayment protocol, charging $0.01 USDC per call.","exampleAgentPrompt":"What's the current EUR to USD exchange rate? Use the Frankfurter proxy and charge my wallet the $0.01 USDC fee.","exampleUseCases":[{"title":"Live currency rate lookup","prompt":"Can you get me the latest exchange rate from EUR to USD and GBP right now? Go ahead and pay the micropayment fee from my wallet."},{"title":"Historical exchange rate query","prompt":"What was the exchange rate between JPY and USD on January 15, 2024? Pull it from the Frankfurter proxy."},{"title":"Supported currencies listing","prompt":"Fetch me the full list of currencies that Frankfurter supports — I need to know which ones I can query rates for."}],"resultDescription":"The raw upstream Frankfurter API response body (JSON) containing exchange rate data, currency lists, or historical rate data, along with the content type header — passed through as-is after the x402 micropayment is settled.","failureModes":["Payment failure — insufficient USDC balance causes 402 Payment Required with no upstream call made","Invalid path — malformed or unsupported Frankfurter path returns upstream 404 or 400 error","Upstream unavailability — Frankfurter service down returns a gateway error","Invalid query parameters — unsupported currency codes or date formats return Frankfurter validation errors","Network timeout — slow upstream response may cause gateway timeout"],"whenToPreferThis":"Choose this endpoint when you need Frankfurter ECB exchange rate data and are operating in a web3/x402 micropayment context where per-call USDC billing is acceptable. It is ideal for agents that already have an x402-capable wallet and want to avoid API key management for currency data. Prefer direct Frankfurter API access if you need higher volume without per-call fees.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:48:02.948Z","isFirstParty":false,"canonicalSlug":"quantaflow-x402-api-gateway-frankfurter-proxy-57235e8b"}