{"id":"301d03bc-6d8b-4208-9a9d-c14f003c0aa4","shortId":"c7Cw5c","kind":"x402","title":"Historical USD/CHF forex data via x402 micropayment on Base, $0.02 per request.","tagline":"Historical USD/CHF forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical exchange rate data for the USD/CHF currency pair. It is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-call APIs spanning finance, analytics, AI/ML, and utilities. All endpoints use the x402 protocol for payment, settling in USDC on the Base network at $0.02 per request with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/forex/USDCHF/history` accepts POST requests and returns JSON. The x402 challenge confirms it is live, advertising a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 \"exact\" scheme to the provider's wallet address.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint's exact input parameters (e.g., date range, granularity) and response format are unknown and must be discovered by calling the endpoint with payment.","tags":[],"capabilities":["forex-history","usd-chf","x402-payment","usdc-base","pay-per-request","historical-exchange-rates","json-api"],"categories":["finance","forex"],"synonyms":["USD CHF exchange rate history","forex historical data","currency pair history","dollar swiss franc rate","FX rate API","USDCHF historical prices"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.","Request parameters (date range, granularity, etc.) are undocumented and must be guessed or discovered experimentally.","Response schema is unknown — no example responses are available.","No OpenAPI or machine-readable spec provided.","The broader lowpaymentfee.com platform lists many endpoint categories but provides no detailed docs for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDCHF/history","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/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The request body format and response structure are entirely 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'0.02':10,22,77,122 '000':112 '0x8335':117 '20':111 '6':126 'FX rate API' 'USD CHF exchange rate history' 'USDCHF historical prices' 'accept':94 'address':141 'advertis':107 'ai/ml':58 'analyt':57 'api':54,82,151 'avail':179 'base':9,21,74,113,119 'broad':47 'call':53,203 'challeng':102 'confirm':103 'connect':160 'content':166 'crawl':182 'currenc':35 'currency pair history' 'data':4,16,31 'date':190 'decim':127 'discov':201 'doc':150 'document':142 'dollar swiss franc rate' 'e.g':189 'endpoint':26,62,91,184,205 'equal':121 'exact':134,186 'exampl':178 'exchang':29 'extrem':147 'financ':56 'forex':3,15 'forex historical data' 'forex-history' 'format':195 'given':123 'granular':192 'histor':1,13,28 'historical-exchange-rates' 'input':187 'json':99 'json-api' 'key':83 'limit':85 'live':106 'lowpaymentfee.com':42 'made':130 'maxamountrequir':109 'micropay':7,19 'must':199 'network':75 'offer':45 'openapi':170 'page':155 'pair':36 'paramet':188 'part':39 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':68,128,207 'per':11,23,52,78 'platform':43 'post':95 'price':152 'prompt':162 'protocol':66 'provid':27,138 'rang':191 'rate':30,84 'readm':154 'render':157 'request':12,24,79,96 'request/response':173 'requir':88 'respons':194 'return':98 'schema':174 'scheme':135 'settl':69 'site':145 'span':55 'spars':148 'spec':171 'specif':90 'subscript':87 'suit':48 'unit':114 'unknown':197 'usag':177 'usd-chf' 'usd/chf':2,14,34 'usdc':71,116,124 'usdc-base' 'use':63 'util':60 'via':5,17,131 'wallet':140,161 'x402':6,18,65,101,133 'x402-payment'","prices":[{"id":"a1bc086f-48b9-4b1e-8d8b-262ae1cde280","listingId":"301d03bc-6d8b-4208-9a9d-c14f003c0aa4","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/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:50.298Z"}],"sources":[{"listingId":"301d03bc-6d8b-4208-9a9d-c14f003c0aa4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDCHF/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:50.298Z","lastSeenAt":"2026-04-29T13:05:03.216Z"}],"details":{"listingId":"301d03bc-6d8b-4208-9a9d-c14f003c0aa4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDCHF/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","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/USDCHF/history"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF/history"},{"claim":"All endpoints 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 platform offers Finance & Web3, Data & Analytics, AI & ML, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving historical USD/CHF exchange rates for backtesting trading strategies","Feeding forex history into financial models or dashboards","Programmatic access to currency data without API key management","Agent-driven forex data retrieval with automatic micropayment"],"bestFor":["Developers needing on-demand forex history without subscriptions","AI agents that can pay per call via x402/USDC on Base","Low-volume or sporadic forex data consumers who want no commitments"],"notFor":["High-frequency trading requiring sub-second latency and bulk data (no documented bulk endpoint)","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.446Z"},"updatedAt":"2026-04-29T13:05:03.216Z"}}