{"id":"83d8ff70-1adb-4edd-93ff-bb19e730bc60","shortId":"Cwm6SC","kind":"x402","title":"Real-time EUR/USD forex exchange rate via x402 micropayment on Base network.","tagline":"Real-time EUR/USD forex exchange rate via x402 micropayment on Base network.","description":"This endpoint returns the current EUR/USD foreign exchange rate, accessible through the x402 payment protocol on the Base network. Each request costs $0.02 in USDC (USD Coin), settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, spanning finance, analytics, AI/ML, crypto, and utility categories. All endpoints on the platform share the same $0.02/request pricing model and x402 payment flow. The specific endpoint at `/api/v1/forex/EURUSD/rate` serves forex market data for the EUR/USD currency pair.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of the response format beyond the x402 challenge's declared `application/json` MIME type. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual response structure after payment is unknown.","tags":[],"capabilities":["forex-rate","eurusd","real-time-data","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["EUR/USD rate","euro dollar exchange rate","forex API","currency exchange rate","FX rate","EURUSD price","foreign exchange data"],"warnings":["No documentation available beyond the landing page listing — docs, API, pricing, and README pages are all empty (wallet-connect only).","No OpenAPI schema or example response provided; the actual response format after payment is unknown.","The specific /api/v1/forex/EURUSD/rate path is not listed on the landing page (the site lists /api/v1/finance/rates instead), so this may be an unlisted or alternate endpoint.","Cannot verify data source, update frequency, or accuracy of the forex rate returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/EURUSD/rate","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/forex/EURUSD/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no example responses, no description of the response schema. The site's docs/pricing/API pages all render only a wallet-connect prompt. Pricing is clear ($0.02/request in USDC on Base), but the actual data returned after payment is 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'/request':103 '0.02':49,102 '402':181 'EUR/USD rate' 'EURUSD price' 'FX rate' 'access':36 'actual':189 'addit':147 'ai/ml':89 'analyt':88 'api':60,82,133 'application/json':172 'base':12,25,44 'base-network' 'beyond':166 'broader':75 'call':81 'categori':93 'chain':57 'challeng':169,186 'coin':53 'commit':68 'confirm':178 'connect':142 'cost':48 'crypto':90 'currenc':122 'currency exchange rate' 'current':31 'data':118 'declar':171 'descript':161 'detail':149 'doc':132 'document':124 'endpoint':28,70,95,112,176 'eur/usd':4,17,32,121 'euro dollar exchange rate' 'eurusd' 'exampl':156 'exchang':6,19,34 'extrem':129 'financ':87 'flow':109 'foreign':33 'foreign exchange data' 'forex':5,18,116 'forex API' 'forex-rate' 'format':165 'key':61 'limit':64 'live':179 'lowpaymentfee.com':85 'market':117 'micropay':10,23 'mime':173 'model':105 'network':13,26,45 'no-api-key' 'offer':83 'on-chain':55 'openapi':153 'page':137 'pair':123 'part':72 'pay':79 'pay-per-cal':78 'pay-per-request' 'payload':158 'payment':40,108,193 'per':80 'platform':98 'price':104,134 'prompt':144 'protocol':41 'rate':7,20,35,63 'readm':136 'real':2,15 'real-tim':1,14 'real-time-data' 'render':139 'request':47 'request/response':157 'respons':164,190 'return':29,180 'schema':154 'serv':115 'settl':54 'share':99 'site':127 'span':86 'spars':130 'specif':111 'structur':191 'suit':76 'technic':148 'time':3,16 'type':174 'unknown':195 'upfront':67 'usd':52 'usdc':51 'usdc-settlement' 'util':92 'valid':184 'via':8,21 'wallet':143 'x402':9,22,39,107,168,185 'x402-payment'","prices":[{"id":"e11ef2b6-8e21-4620-9060-848f5325aef8","listingId":"83d8ff70-1adb-4edd-93ff-bb19e730bc60","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/forex/EURUSD/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:34.199Z"}],"sources":[{"listingId":"83d8ff70-1adb-4edd-93ff-bb19e730bc60","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/EURUSD/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:34.199Z","lastSeenAt":"2026-04-28T16:09:46.533Z"}],"details":{"listingId":"83d8ff70-1adb-4edd-93ff-bb19e730bc60","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/EURUSD/rate\n# Returns 402 with x402 challenge. Include X-PAYMENT header with valid payment proof to receive the EUR/USD rate.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/EURUSD/rate"},{"claim":"All endpoints on the platform cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base (6 decimals), so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current EUR/USD exchange rate for trading bots or financial dashboards","Programmatic currency conversion in payment or invoicing applications","Agent-driven forex data retrieval without API key management","On-demand FX rate lookups for DeFi or cross-border payment workflows"],"bestFor":["Agents or bots that need on-demand EUR/USD rates without subscription overhead","Developers wanting keyless, pay-per-call forex data on Base","Low-volume or sporadic forex rate lookups at $0.02 per call"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk rate feeds","Users who need historical forex data or OHLCV candles (not indicated as supported)","Anyone without a Base-network USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:18.241Z"},"updatedAt":"2026-04-28T16:09:46.533Z"}}