{"id":"2087b30c-b0a9-4f7c-a262-769d7e19bd09","shortId":"HNVBJz","kind":"x402","title":"USD/CHF forex rate via x402 micropayment on Base for $0.02 per request.","tagline":"USD/CHF forex rate via x402 micropayment on Base for $0.02 per request.","description":"This endpoint provides USD/CHF foreign exchange rate data, accessible through the x402 payment protocol. It is part of a broader suite of APIs hosted at lowpaymentfee.com covering finance, analytics, AI/ML, crypto, and utility services. Each request costs $0.02, paid in USDC on the Base network — no API keys, no rate limits, and no subscriptions required.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 `X-PAYMENT` header using the \"exact\" scheme, settling to a specified wallet address in USDC (contract 0x8335…2913 on Base). The x402 challenge was successfully captured, confirming the endpoint is live.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact structure of the forex data returned (bid/ask, mid-rate, timestamp, etc.) is unknown and must be discovered by making a paid request.","tags":[],"capabilities":["forex-rate","usd-chf","x402-payment","usdc-base","micropayment","per-request-pricing","no-api-key","json-response"],"categories":["finance","forex"],"synonyms":["USD CHF exchange rate","dollar swiss franc rate","forex API","currency pair rate","FX rate USDCHF","foreign exchange data"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all returned only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request body and response structure are unknown.","The exact nature of the forex data (real-time vs delayed, fields returned, data source) is undocumented.","Provider hosts many diverse endpoint categories (AI, analytics, crypto, utils) all at $0.02 — quality and reliability of each is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDCHF","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/USDCHF","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, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no example payloads. The actual data returned is entirely 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'/docs':135 '/pricing':136 '/readme':139 '0.02':10,22,62 '0x8335':111 '2913':112 'FX rate USDCHF' 'USD CHF exchange rate' 'accept':82 'access':33 'address':107 'ai/ml':54 'analyt':53 'api':47,71 'avail':165 'base':8,20,68,114 'beyond':127 'bid/ask':174 'broader':44 'captur':120 'challeng':117 'confirm':121 'connect':145 'content':151 'contract':110 'cost':61 'cover':51 'crypto':55 'currency pair rate' 'data':32,172 'discov':185 'document':126,160 'dollar swiss franc rate' 'endpoint':26,81,123 'etc':179 'exact':100,167 'exampl':163 'exchang':30 'extrem':132 'financ':52 'foreign':29 'foreign exchange data' 'forex':2,14,171 'forex API' 'forex-rate' 'handl':90 'header':97 'host':48 'json':87 'json-response' 'key':72 'land':129 'limit':75 'live':125 'lowpaymentfee.com':50 'make':187 'micropay':6,18 'micropayment' 'mid':176 'mid-rat':175 'must':183 'network':69 'no-api-key' 'openapi':155 'page':130,140 'paid':63,189 'part':41 'payload':164 'payment':37,88,96 'per':11,23 'per-request-pricing' 'post':83 'prompt':147 'protocol':38 'provid':27 'rate':3,15,31,74,177 'request':12,24,60,84,190 'request/response':158 'requir':79 'return':86,142,173 'schema':159 'scheme':101 'servic':58 'settl':102 'spars':133 'spec':156 'specifi':105 'structur':168 'subscript':78 'success':119 'suit':45 'timestamp':178 'unknown':181 'usd-chf' 'usd/chf':1,13,28 'usdc':65,109 'usdc-base' 'use':98 'util':57 'via':4,16,91 'wallet':106,146 'x':95 'x-payment':94 'x402':5,17,36,93,116 'x402-payment'","prices":[{"id":"4f746ad5-4790-41de-aa1f-167f8813a5f9","listingId":"2087b30c-b0a9-4f7c-a262-769d7e19bd09","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/USDCHF","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:45.562Z"}],"sources":[{"listingId":"2087b30c-b0a9-4f7c-a262-769d7e19bd09","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDCHF","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:45.562Z","lastSeenAt":"2026-04-29T13:34:31.271Z"}],"details":{"listingId":"2087b30c-b0a9-4f7c-a262-769d7e19bd09","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDCHF \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with status 402, confirming it is live.","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals = $0.02).","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF"},{"claim":"Payment settles in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching real-time or recent USD/CHF exchange rates for trading bots or dashboards","Integrating forex data into agent workflows that can pay per-call via x402","Building financial applications that need on-demand currency conversion data without subscription commitments"],"bestFor":["Agents or apps needing USD/CHF rates with zero onboarding friction","x402-compatible clients that can pay in USDC on Base","Low-volume or sporadic forex data needs where per-request pricing is economical"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk rate plans","Users who need comprehensive multi-pair forex feeds in a single call","Developers who require detailed API documentation and schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.694Z"},"updatedAt":"2026-04-29T13:34:31.271Z"}}