{"id":"f98cb0da-b7f9-4e64-8d6d-89d61c93b812","shortId":"tAvMZB","kind":"x402","title":"AUD/CHF forex exchange rate via x402 micropayment on Base for $0.02 per request.","tagline":"AUD/CHF forex exchange rate via x402 micropayment on Base for $0.02 per request.","description":"This endpoint provides the current AUD/CHF (Australian Dollar to Swiss Franc) foreign exchange rate. It is part of a broader suite of APIs hosted at lowpaymentfee.com, which covers finance, analytics, AI/ML, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/forex/AUDCHF/rate` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is made via the `X-PAYMENT` header with no API keys or rate limits required. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, 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 endpoint URL pattern (`/forex/AUDCHF/rate`) and the broader site category (\"Finance & Web3 — Market data and financial calculations\") strongly suggest it returns a current or recent exchange rate, but the exact response format is unknown.","tags":[],"capabilities":["forex-rate","aud-chf","x402-payment","usdc-base","micropayment","real-time-data","no-api-key"],"categories":["finance","forex"],"synonyms":["AUD CHF exchange rate","Australian Dollar Swiss Franc","forex rate API","currency conversion","FX rate","AUDCHF spot rate","currency pair rate"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","The /forex/AUDCHF/rate path does not appear in the site's listed endpoints; it may be undocumented or dynamically generated","No example responses available to verify data quality or freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/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/AUDCHF/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, network, and asset details. However, 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 purpose is inferable from its URL but not formally 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'/forex/audchf/rate':195 '0.02':11,24,108 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':145 '20':102 '6':113 'AUD CHF exchange rate' 'AUDCHF spot rate' 'Australian Dollar Swiss Franc' 'FX rate' 'accept':84 'addit':172 'address':136 'ai/ml':57 'analyt':56 'api':49,128,158 'asset':142 'aud-chf' 'aud/chf':1,14,32 'australian':33 'base':9,22,77,104,147 'beyond':149 'broader':46,198 'calcul':207 'categori':200 'challeng':92 'confirm':93 'connect':167 'contract':143 'cover':54 'crypto':58 'currency conversion' 'currency pair rate' 'current':31,213 'data':204 'decim':114 'descript':186 'detail':174 'doc':157 'document':148 'dollar':34 'endpoint':28,63,81,95,192 'exact':220 'exampl':181 'exchang':3,16,39,216 'extrem':154 'financ':55,201 'financi':206 'foreign':38 'forex':2,15 'forex rate API' 'forex-rate' 'format':222 'franc':37 'header':125 'host':50 'json':89 'key':129 'land':151 'limit':132 'live':97 'lowpaymentfee.com':52 'made':119 'market':203 'maximum':100 'micropay':7,20 'micropayment' 'network':78 'no-api-key' 'openapi':178 'page':152,162 'part':43 'pattern':194 'payload':183 'payment':70,117,124,135 'per':12,25,115 'platform':66 'post':85 'price':159 'prompt':169 'protocol':71 'provid':29 'rate':4,17,40,131,217 'readm':161 'real-time-data' 'recent':215 'render':164 'request':13,26,86,116 'request/response':182 'requir':98,133 'respons':189,221 'return':88,211 'schema':190 'servic':61 'settl':72 'sinc':110 'site':199 'spars':155 'spec':179 'specif':80 'strong':208 'suggest':209 'suit':47 'swiss':36 'technic':173 'unit':105 'unknown':224 'url':193 'usd':109 'usdc':74,107,111,141 'usdc-base' 'use':67,112 'util':60 'via':5,18,120 'wallet':168 'web3':202 'x':123 'x-payment':122 'x402':6,19,69,91 'x402-payment'","prices":[{"id":"0115774c-fc3d-472d-a5c6-71e780b216e6","listingId":"f98cb0da-b7f9-4e64-8d6d-89d61c93b812","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/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":"2026-04-18T18:46:32.380Z"}],"sources":[{"listingId":"f98cb0da-b7f9-4e64-8d6d-89d61c93b812","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:32.380Z","lastSeenAt":"2026-04-29T15:05:03.111Z"}],"details":{"listingId":"f98cb0da-b7f9-4e64-8d6d-89d61c93b812","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/AUDCHF/rate \\\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":"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/AUDCHF/rate"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/AUDCHF/rate"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site categorizes finance endpoints under 'Finance & Web3 — Market data and financial calculations'","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current AUD/CHF exchange rate for trading bots or portfolio dashboards","Programmatic currency conversion calculations involving AUD and CHF","Embedding live forex data into financial applications without API key management","Agent-driven forex lookups paid per-call via x402 micropayments"],"bestFor":["Agents or apps needing on-demand AUD/CHF rates without subscription commitments","Developers who want pay-per-call forex data settled in crypto (USDC on Base)","Low-volume or bursty forex data consumers who prefer no rate limits or API keys"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk historical data","Users who need forex rates for many currency pairs in a single call","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:18.353Z"},"updatedAt":"2026-04-29T15:05:03.111Z"}}