{"id":"4f8e5568-9abd-4bd0-b429-3c649fb1262e","shortId":"FwzNH3","kind":"x402","title":"Real-time EUR/CHF forex rate via x402 micropayment on Base for $0.02 per request.","tagline":"Real-time EUR/CHF forex rate via x402 micropayment on Base for $0.02 per request.","description":"This endpoint returns the current EUR/CHF foreign exchange rate, accessible through the x402 payment protocol on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals) and requires no API keys, accounts, or rate limits — just an x402-compatible payment header.\n\nThe endpoint is part of a broader API platform at lowpaymentfee.com that offers data & analytics, AI/ML inference, finance & Web3, and infrastructure utility endpoints, all priced uniformly at $0.02 per call. Payment settles on-chain via USDC on Base to the provider's wallet. The x402 challenge confirms the endpoint is live and accepting POST requests with JSON responses.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The exact data source for the forex rate is not disclosed.","tags":[],"capabilities":["forex-rate","eur-chf","x402-payment","usdc-base","real-time-data","per-request-pricing","no-api-key"],"categories":["finance","forex"],"synonyms":["EUR/CHF exchange rate","euro swiss franc rate","forex API","currency conversion","FX rate","foreign exchange rate API","EURCHF spot rate"],"warnings":["No OpenAPI or schema documentation available — response format must be discovered empirically","Docs, pricing, and README pages render only 'Connect wallet' with no technical content","Data source for the EUR/CHF rate is undisclosed; accuracy and freshness guarantees are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/EURCHF/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/EURCHF/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond a wallet connect prompt. The endpoint's data source and response format are entirely 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'/pricing':147 '/readme':149 '0.02':13,28,53,106 '000':55 '20':54 '6':61 'EUR/CHF exchange rate' 'EURCHF spot rate' 'FX rate' 'accept':132 'access':40 'account':68 'addit':160 'ai/ml':94 'analyt':93 'api':66,86 'base':11,26,48,56,117 'beyond':139 'broader':85 'call':108 'chain':113 'challeng':125 'compat':76 'confirm':126 'connect':155 'cost':52 'currency conversion' 'current':35 'data':92,181 'decim':62 'descript':174 'detail':162 'disclos':189 'document':138 'endpoint':32,80,101,128 'eur-chf' 'eur/chf':4,19,36 'euro swiss franc rate' 'exact':180 'exampl':169 'exchang':38 'financ':96 'foreign':37 'foreign exchange rate API' 'forex':5,20,185 'forex API' 'forex-rate' 'header':78 'infer':95 'infrastructur':99 'json':136 'key':67 'land':141 'limit':71 'live':130 'lowpaymentfee.com':89 'micropay':9,24 'network':49 'no-api-key' 'offer':91 'on-chain':111 'openapi':166 'page':142,150 'part':82 'payload':171 'payment':44,77,109 'per':14,29,107 'per-request-pricing' 'platform':87 'post':133 'price':103 'prompt':157 'protocol':45 'provid':120 'rate':6,21,39,70,186 'real':2,17 'real-tim':1,16 'real-time-data' 'render':152 'request':15,30,51,134 'request/response':170 'requir':64 'respons':137,177 'return':33 'schema':178 'settl':110 'sourc':182 'spars':144 'spec':167 'technic':161 'time':3,18 'uniform':104 'unit':57 'usdc':59,115 'usdc-base' 'util':100 'via':7,22,114 'wallet':122,156 'web3':97 'x402':8,23,43,75,124 'x402-compatible':74 'x402-payment'","prices":[{"id":"f73c5478-84d2-4841-9eb9-35ccb8872c13","listingId":"4f8e5568-9abd-4bd0-b429-3c649fb1262e","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/EURCHF/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":"2026-04-18T18:46:37.784Z"}],"sources":[{"listingId":"4f8e5568-9abd-4bd0-b429-3c649fb1262e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/EURCHF/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:37.784Z","lastSeenAt":"2026-04-29T14:34:10.058Z"}],"details":{"listingId":"4f8e5568-9abd-4bd0-b429-3c649fb1262e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/EURCHF/rate \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/EURCHF/rate"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/EURCHF/rate"}],"useCases":["Fetching the current EUR/CHF spot rate for trading bots or financial dashboards","Integrating real-time forex data into agent workflows without API key management","Pay-per-call currency rate lookups for low-volume or sporadic use cases"],"bestFor":["Agents or bots that need on-demand EUR/CHF rates without subscription commitments","Developers prototyping forex-dependent features with minimal setup","x402-native applications settling micropayments on Base"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk historical data","Users who need comprehensive multi-pair forex coverage from a single endpoint","Applications that cannot handle on-chain USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:18.085Z"},"updatedAt":"2026-04-29T14:34:10.058Z"}}