{"id":"2773a741-446c-410e-921b-9fbde6047155","shortId":"gyccz5","kind":"x402","title":"Pay-per-call USD/CHF forex rate via x402 on Base, settled in USDC at $0.02/request.","tagline":"Pay-per-call USD/CHF forex rate via x402 on Base, settled in USDC at $0.02/request.","description":"This endpoint provides the current USD/CHF foreign exchange rate through a simple POST request, paid per call using the x402 protocol on the Base network. Payment is settled in USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe endpoint is part of a broader suite of APIs offered at lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. The forex rate endpoint specifically targets the USD/CHF currency pair and returns JSON. The x402 challenge confirms the endpoint is live, discoverable, and accepts POST requests.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, and /README pages all render only a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. Callers should expect a JSON object containing the current USD/CHF exchange rate, but the exact field names and structure are unknown.","tags":[],"capabilities":["forex-rate","usd-chf","x402-payment","usdc-settlement","base-network","per-call-pricing","no-api-key","real-time-data"],"categories":["finance","forex"],"synonyms":["USD CHF exchange rate","dollar swiss franc rate","forex API","currency conversion","FX rate","USDCHF spot rate","foreign exchange rate API"],"warnings":["No OpenAPI specification or response schema available — response format is unknown","Documentation pages (/docs, /pricing, /README) render only a wallet-connect prompt with no content","No example request or response payloads are provided anywhere in the crawl material","The broader site lists many endpoints but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDCHF/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/USDCHF/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/pricing/README pages are empty wallet-connect stubs. The listing is functional but minimally 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'/pricing':166 '/readme':168 '/request':17,34 '0.02':16,33,71,128 '000':75 '20':74 '6':79 'FX rate' 'USD CHF exchange rate' 'USDCHF spot rate' 'accept':154 'addit':180 'ai/ml':116 'analyt':115 'api':82,108 'attach':91 'base':11,28,58,76 'base-network' 'beyond':158 'broader':105 'call':4,21,51 'caller':89,199 'challeng':146 'coin':66 'confirm':147 'connect':176 'contain':205 'cost':69 'currenc':139 'currency conversion' 'current':39,207 'data':114,120 'decim':80 'descript':194 'detail':182 'discover':152 'document':157 'dollar swiss franc rate' 'endpoint':36,100,134,149 'exact':213 'exampl':189 'exchang':42,209 'expect':201 'field':214 'finance/crypto':118 'foreign':41 'foreign exchange rate API' 'forex':6,23,132 'forex API' 'forex-rate' 'header':95 'infer':117 'json':143,203 'key':83 'land':160 'limit':86 'live':151 'lowpaymentfee.com':111 'market':119 'name':215 'network':59 'no-api-key' 'object':204 'offer':109 'openapi':186 'page':161,169 'paid':49 'pair':140 'part':102 'pay':2,19 'pay-per-cal':1,18 'payload':191 'payment':60,94 'per':3,20,50,72,129 'per-call-pricing' 'post':47,155 'price':125 'prompt':177 'protocol':55 'provid':37 'rate':7,24,43,85,133,210 'real-time-data' 'render':171 'request':48,73,98,130,156 'request/response':190 'requir':88 'respons':197 'return':142 'schema':198 'servic':123 'settl':12,29,62 'simpl':46 'simpli':90 'span':113 'spars':163 'spec':187 'specif':135 'structur':217 'suit':106 'target':136 'technic':181 'uniform':126 'unit':77 'unknown':219 'usd':65 'usd-chf' 'usd/chf':5,22,40,138,208 'usdc':14,31,64 'usdc-settlement' 'use':52 'util':122 'via':8,25 'wallet':175 'wallet-connect':174 'x402':9,26,54,93,145 'x402-payment'","prices":[{"id":"a31a472b-fc4b-4192-a5cd-942d7ee8ab23","listingId":"2773a741-446c-410e-921b-9fbde6047155","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/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":"2026-04-18T18:46:46.758Z"}],"sources":[{"listingId":"2773a741-446c-410e-921b-9fbde6047155","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDCHF/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:46.758Z","lastSeenAt":"2026-04-29T13:34:31.345Z"}],"details":{"listingId":"2773a741-446c-410e-921b-9fbde6047155","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDCHF/rate \\\n  -H \"Content-Type: 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 HTTP 402 with x402 challenge confirming it is live on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF/rate"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF/rate"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCHF/rate"},{"claim":"Site advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only wallet-connect prompts with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching the current USD/CHF exchange rate for trading bots or portfolio dashboards","Integrating real-time forex data into financial applications without managing API keys","Agent-driven currency lookups where per-call micropayments replace subscription plans"],"bestFor":["Agents or apps needing on-demand USD/CHF rates without subscription overhead","Developers building on Base who want USDC-settled API access","Low-volume or sporadic forex data consumers who prefer pay-per-use"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk historical data","Users who need forex pairs other than USD/CHF from this specific endpoint","Consumers who require detailed documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.656Z"},"updatedAt":"2026-04-29T13:34:31.345Z"}}