{"id":"ffc190a9-9b69-47c6-b4bd-947570132dab","shortId":"u5brm6","kind":"x402","title":"Historical AUD/CHF forex data via x402 micropayment on Base, $0.02 per request.","tagline":"Historical AUD/CHF forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical forex data for the AUD/CHF currency pair. It is part of the lowpaymentfee.com platform, which offers a range of data, AI, finance, and utility APIs all priced at $0.02 per request using the x402 payment protocol. Payment is settled 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. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02 per call. The payment is made via the x402 \"exact\" scheme to the provider's wallet address.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, 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 example payloads available. The exact request parameters (e.g., date range, granularity) and response format (e.g., OHLC candles, close prices, timestamps) are unknown and must be discovered by calling the endpoint.","tags":[],"capabilities":["forex-history","aud-chf","x402-payment","usdc-base","micropayment","financial-data","currency-pair-history"],"categories":["finance","data"],"synonyms":["AUD CHF historical rates","Australian dollar Swiss franc history","forex historical data API","currency exchange rate history","AUD/CHF OHLC","fx rate history","foreign exchange data"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","Request parameters (date range, granularity, etc.) are completely unknown — no schema or examples provided.","Response format is undocumented; callers must discover the shape experimentally.","No OpenAPI or machine-readable spec found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/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/AUDCHF/history","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request parameters, no response schema, and no examples. The docs pages are empty. This is effectively a stub listing with only the payment challenge and landing page to go 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'/docs':144 '/pricing':145 '/readme':148 '0.02':10,22,57,117 '000':105 '0x8335':110 '20':104 '6':113 'AUD CHF historical rates' 'AUD/CHF OHLC' 'Australian dollar Swiss franc history' 'accept':86 'address':134 'advertis':100 'ai':49 'api':53,75 'aud-chf' 'aud/chf':2,14,33 'avail':173 'base':9,21,72,106,112 'beyond':136 'call':119,198 'candl':187 'challeng':94 'close':188 'confirm':95 'connect':154 'content':160 'currenc':34 'currency exchange rate history' 'currency-pair-history' 'data':4,16,30,48 'date':179 'decim':114 'discov':196 'document':135 'e.g':178,185 'endpoint':26,85,97,200 'equal':116 'exact':127,175 'exampl':171 'extrem':141 'financ':50 'financial-data' 'foreign exchange data' 'forex':3,15,29 'forex historical data API' 'forex-history' 'format':184 'fx rate history' 'granular':181 'histor':1,13,28 'json':91 'key':76 'land':138 'limit':79 'live':99 'lowpaymentfee.com':41 'made':123 'maxamountrequir':102 'micropay':7,19 'micropayment' 'must':194 'network':73 'offer':44 'ohlc':186 'openapi':164 'page':139,149 'pair':35 'paramet':177 'part':38 'payload':172 'payment':63,65,121 'per':11,23,58,118 'platform':42 'post':87 'price':55,189 'prompt':156 'protocol':64 'provid':27,131 'rang':46,180 'rate':78 'render':151 'request':12,24,59,88,176 'request/response':167 'requir':83 'respons':183 'return':90 'schema':168 'scheme':128 'settl':67 'spars':142 'spec':165 'subscript':82 'timestamp':190 'unit':107 'unknown':192 'usdc':69,109 'usdc-base' 'use':60 'util':52 'via':5,17,124 'wallet':133,155 'x402':6,18,62,93,126 'x402-payment'","prices":[{"id":"af3c9aba-7b5a-4f8a-929e-80c6ba800d2c","listingId":"ffc190a9-9b69-47c6-b4bd-947570132dab","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/AUDCHF/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":"2026-04-18T18:46:35.401Z"}],"sources":[{"listingId":"ffc190a9-9b69-47c6-b4bd-947570132dab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:35.401Z","lastSeenAt":"2026-04-28T14:34:58.352Z"}],"details":{"listingId":"ffc190a9-9b69-47c6-b4bd-947570132dab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/AUDCHF/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","source_url":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/history"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/history"},{"claim":"All APIs 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 platform offers Finance & Web3 category APIs including market data and financial calculations","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving historical AUD/CHF exchange rates for backtesting trading strategies","Building financial dashboards that display forex history","Feeding currency pair data into quantitative models or analytics pipelines","Comparing AUD/CHF trends over time for risk assessment"],"bestFor":["Agents or apps needing on-demand forex history without API key management","Micropayment-based access to financial data with no subscription commitment","Developers building on Base who want seamless crypto-native API payments"],"notFor":["Users needing real-time streaming forex quotes (this is a history endpoint)","Bulk historical data downloads where per-request pricing would be cost-prohibitive","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:18.24Z"},"updatedAt":"2026-04-28T14:34:58.352Z"}}