{"uid":"cap_T5GOCSe6F439rq3OKFivd","slug":"polyform-fx-rate-usd-to-currency-conversion-f89c8e2b","name":"Polyform FX Rate — USD to Currency Conversion","description":"Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.","url":"https://api.polyform.org/v1/fx/rate?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":{"type":"json","example":{"base":"USD","date":"2026-09-28","rates":{"EUR":{"rate":0.923,"converted":0.923}},"amount":1,"source":"European Central Bank via Frankfurter"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_q1qHwWdYmaxG9KgWE-Efd","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current USD exchange rate for one or more currencies, sourced from the European Central Bank via Frankfurter, paid per-call with USDC on Base.","exampleAgentPrompt":"What's today's exchange rate from USD to EUR? I need the live rate from the European Central Bank.","exampleUseCases":[{"title":"Invoice currency conversion for freelancer","prompt":"I'm invoicing a client in Germany for $1,500 USD — what's the current USD to EUR exchange rate so I can show the euro equivalent on the invoice?"},{"title":"Travel budget planning in GBP","prompt":"I'm heading to London next month and want to know how many British pounds my $2,000 travel budget is worth at today's rate."},{"title":"Real-time FX check for trading dashboard","prompt":"Fetch the current USD to CHF exchange rate — I need the latest figure from the European Central Bank for my portfolio tracker."}],"resultDescription":"Returns a JSON object with the base currency (USD), today's date, the requested target currency and its rate against USD, the converted amount, and the data source (European Central Bank via Frankfurter).","failureModes":["Unsupported or invalid currency code returns an error","ECB/Frankfurter data source unavailable causes fetch failure","Payment not confirmed on Base results in 402 rejection","Malformed query parameters return a 400 error"],"whenToPreferThis":"Choose this endpoint when you need a reliable, ECB-sourced USD exchange rate with no API key or account setup, and you are comfortable paying $0.003 USDC per call via x402 on Base. Ideal for AI agents that need one-off or infrequent FX lookups without a subscription commitment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:44:51.015Z","isFirstParty":false,"canonicalSlug":"polyform-fx-rate-usd-to-currency-conversion-f89c8e2b"}