{"id":"6359cc93-0aaf-4d50-8171-426bb892e70e","shortId":"3sS7Nj","kind":"x402","title":"Pay-per-call AUD/CHF forex rate data via x402 on Base (USDC).","tagline":"Pay-per-call AUD/CHF forex rate data via x402 on Base (USDC).","description":"This endpoint at lowpaymentfee.com provides AUD/CHF (Australian Dollar to Swiss Franc) foreign exchange rate data, accessible via the x402 payment protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns JSON.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call APIs spanning finance, AI/ML, data analytics, and utility services, all priced at $0.02 per request and settled on-chain via USDC on Base. This specific endpoint falls under the Finance & Web3 category, alongside other endpoints for price feeds, exchange rates, token quotes, and gas estimates.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual data format and fields returned are unknown.","tags":[],"capabilities":["forex-rate","aud-chf","x402-payment","usdc-base","pay-per-call","json-response"],"categories":["finance","forex"],"synonyms":["AUD CHF exchange rate","Australian Dollar Swiss Franc","forex API","currency conversion","FX rate","foreign exchange rate API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content.","No request or response schema documented; actual data fields and format are unknown.","No OpenAPI or machine-readable spec found.","Endpoint behavior (real-time vs. historical, data source, update frequency) is entirely unspecified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/AUDCHF","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","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/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the docs pages are empty. The listing is effectively a stub with only the payment challenge and landing page to go 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'402':183 'AUD CHF exchange rate' 'Australian Dollar Swiss Franc' 'FX rate' 'accept':70 'access':42 'actual':187 'ai/ml':91 'alongsid':121 'analyt':93 'api':59,88,142 'aud-chf' 'aud/chf':5,18,32 'australian':33 'avail':169 'base':12,25,56,111 'broad':81 'call':4,17,87 'catalog':82 'categori':120 'chain':107 'challeng':184 'confirm':177 'connect':148 'cost':50 'crawl':172 'currency conversion' 'data':8,21,41,92,188 'detail':155 'doc':139 'document':134,164 'dollar':34 'endpoint':28,69,114,123,175 'estim':133 'exampl':168 'exchang':39,127 'extrem':136 'fall':115 'feed':126 'field':191 'financ':90,118 'foreign':38 'foreign exchange rate API' 'forex':6,19 'forex API' 'forex-rate' 'format':189 'franc':37 'gas':132 'host':79 'json':75 'json-response' 'key':60 'limit':63 'live':178 'lowpaymentfee.com':30,78 'materi':173 'network':57 'on-chain':105 'openapi':159 'page':143 'pay':2,15,85 'pay-per-cal':1,14,84 'pay-per-call' 'payment':46 'per':3,16,86,101 'post':71 'price':98,125,140 'prompt':150 'protocol':47 'provid':31,77 'quot':130 'rate':7,20,40,62,128 'render':145 'request':49,72,102 'request/response':162 'requir':67 'return':74,179,192 'schema':163 'servic':96 'settl':104 'span':89 'spars':137 'spec':160 'specif':113 'subscript':66 'swiss':36 'technic':154 'token':129 'unknown':194 'usag':167 'usdc':13,26,53,109 'usdc-base' 'util':95 'valid':181 'via':9,22,43,108 'wallet':149 'web3':119 'x402':10,23,45,182 'x402-payment'","prices":[{"id":"27d11215-450d-4339-b0f9-4b9aed1cdcbb","listingId":"6359cc93-0aaf-4d50-8171-426bb892e70e","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 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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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/AUDCHF"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/AUDCHF"}],"useCases":["Fetching real-time or recent AUD/CHF exchange rate for trading applications","Incorporating AUD/CHF rate data into financial dashboards or reports","Automated currency conversion calculations involving AUD and CHF"],"bestFor":["Agents or apps needing on-demand AUD/CHF forex data without API key management","Micropayment-friendly workflows where per-call pricing is preferred","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk rate plans","Users who need comprehensive multi-pair forex data in a single call","Applications that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:18.353Z"},"updatedAt":"2026-04-29T15:05:03.120Z"}}