{"id":"c0b00d33-dc02-4f27-a746-acfff27291a1","shortId":"6n6HJR","kind":"x402","title":"Pay-per-call USD/CAD forex rate via x402 on Base, settled in USDC at $0.02/request.","tagline":"Pay-per-call USD/CAD forex rate via x402 on Base, settled in USDC at $0.02/request.","description":"This endpoint provides the current USD/CAD foreign exchange rate through a simple POST request, paid per call using the x402 protocol. It is part of a broader suite of APIs hosted at lowpaymentfee.com covering finance, analytics, AI/ML, crypto, and utility services.\n\nThe endpoint is live and returns a standard x402 payment challenge (HTTP 402) requiring an X-PAYMENT header with a Base-network USDC payment. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on the Base L2 network, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The payment scheme is \"exact\" with a timeout of 300 seconds.\n\nNo API keys or rate limits are advertised. The response MIME type is application/json. Documentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all appear to require a wallet connection and yield no additional content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available, so the exact shape of the returned forex data must be inferred.","tags":[],"capabilities":["forex-rate","usd-cad","x402-payment","usdc-base","pay-per-call","real-time-data","no-api-key"],"categories":["finance","forex"],"synonyms":["USD CAD exchange rate","dollar to canadian dollar","forex API","currency conversion","FX rate","USDCAD spot rate","currency exchange rate API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response payload structure is unknown — no examples found in crawl","All documentation pages (/docs, /pricing, /api, /README) appear to require wallet connection and returned no useful content","The broader lowpaymentfee.com platform lists many endpoints across diverse categories (AI, analytics, finance, utils) — quality and reliability of each is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDCAD/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/USDCAD/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","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 documented request/response schema, no example payloads, and the docs/pricing pages are gated behind wallet connection, leaving the actual response format 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'/docs':170 '/pricing':171 '/readme':174 '/request':17,34 '0.02':16,33,117 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':136 '20':107 '300':146 '402':88 '6':113 'FX rate' 'USD CAD exchange rate' 'USDCAD spot rate' 'addit':186 'address':124 'advertis':155 'ai/ml':71 'amount':104 'analyt':70 'api':64,149 'appear':177 'application/json':161 'avail':201 'base':11,28,98,109,128 'base-network':97 'beyond':163 'broader':61 'call':4,21,51 'challeng':86 'connect':182 'content':187 'contract':134 'cover':68 'crypto':72 'currency conversion' 'currency exchange rate API' 'current':39 'data':210 'decim':114 'document':162,196 'dollar to canadian dollar' 'endpoint':36,77 'equal':116 'exact':141,204 'exampl':199 'exchang':42 'financ':69 'foreign':41 'forex':6,23,209 'forex API' 'forex-rate' 'header':94 'host':65 'http':87 'infer':213 'key':150 'l2':129 'land':165 'limit':153 'live':79 'lowpaymentfee.com':67 'maximum':103 'mime':158 'must':211 'network':99,130 'no-api-key' 'openapi':191 'page':166,175 'paid':49 'part':58 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'payload':200 'payment':85,93,101,120,138 'per':3,20,50,118 'post':47 'protocol':55 'provid':37 'rate':7,24,43,152 'real-time-data' 'request':48,119 'request/response':194 'requir':89,105,179 'respons':157 'return':81,208 'schema':195 'scheme':139 'second':147 'sent':122 'servic':75 'settl':12,29 'shape':205 'simpl':46 'spars':168 'spec':192 'standard':83 'suit':62 'timeout':144 'type':159 'unit':110 'usd-cad' 'usd/cad':5,22,40 'usdc':14,31,100,112,133 'usdc-base' 'use':52,131 'util':74 'via':8,25 'wallet':181 'x':92 'x-payment':91 'x402':9,26,54,84 'x402-payment' 'yield':184","prices":[{"id":"b44e3e5c-9b1b-470a-8784-a958408b8cd7","listingId":"c0b00d33-dc02-4f27-a746-acfff27291a1","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/USDCAD/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":"2026-04-18T18:46:50.298Z"}],"sources":[{"listingId":"c0b00d33-dc02-4f27-a746-acfff27291a1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDCAD/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:50.298Z","lastSeenAt":"2026-04-29T13:05:03.210Z"}],"details":{"listingId":"c0b00d33-dc02-4f27-a746-acfff27291a1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDCAD/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 USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCAD/rate"},{"claim":"Price is $0.02 per request (20000 base units of USDC with 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/USDCAD/rate"}],"useCases":["Fetching the current USD/CAD exchange rate for financial applications","Automating currency conversion calculations in trading bots","Embedding live forex data into dashboards or reports","Agent-driven forex lookups without API key management","Pay-as-you-go FX data for low-volume or sporadic usage"],"bestFor":["Developers needing simple, keyless forex data access","AI agents that can settle x402 micropayments on Base","Low-volume or on-demand USD/CAD rate lookups"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing","Users who need historical forex time-series data (not evidenced here)","Applications that cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.484Z"},"updatedAt":"2026-04-29T13:05:03.210Z"}}