{"id":"8c54226b-1438-48ce-b6b4-f768a1cd9c3f","shortId":"ec3sqa","kind":"x402","title":"Historical USD/MXN forex data via x402 micropayment on Base, $0.02 per request.","tagline":"Historical USD/MXN forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical exchange-rate data for the USD/MXN currency pair. It is part of the lowpaymentfee.com platform, which offers a suite of pay-per-call APIs spanning finance, analytics, AI, and utilities — all gated via the x402 payment protocol on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header containing a signed USDC payment on Base. The cost is $0.02 per request (20,000 base units of USDC, which has 6 decimals). There are no API keys, no rate limits, and no subscription commitments — you pay only for the calls you make.\n\nDocumentation beyond the landing page is sparse. The /docs, /pricing, and /README pages all resolve to a wallet-connect stub with no additional technical detail. No OpenAPI schema, request-body specification, or sample response is published, so the exact query parameters (date range, granularity, etc.) and response shape must be discovered experimentally. The endpoint is live and returns a valid x402 challenge (HTTP 402) confirming it is ready to accept paid requests.","tags":[],"capabilities":["forex-history","usd-mxn","x402-payment","per-request-pricing","base-network","usdc-settlement","no-api-key","pay-per-call"],"categories":["finance","forex"],"synonyms":["USD MXN exchange rate","dollar peso history","forex historical data","currency pair history","USDMXN rate","FX data API","peso exchange rate"],"warnings":["No OpenAPI or schema documentation is available; request parameters and response format are undocumented.","The /docs, /pricing, and /README pages all render only a wallet-connect stub with no useful content.","The endpoint's exact query capabilities (date ranges, granularity, pagination) are unknown and must be discovered experimentally."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDMXN/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/USDMXN/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts paid POST requests for $0.02 in USDC on Base. However, there is no published OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The exact request body format and response shape are 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'/pricing':143 '/readme':145 '0.02':10,22,101 '000':105 '20':104 '402':199 '6':112 'FX data API' 'USD MXN exchange rate' 'USDMXN rate' 'accept':74,205 'addit':157 'ai':58 'analyt':57 'api':54,117 'attach':85 'base':9,21,70,97,106 'base-network' 'beyond':135 'bodi':165 'call':53,131 'caller':84 'challeng':197 'commit':125 'confirm':200 'connect':153 'contain':91 'cost':99 'currenc':36 'currency pair history' 'data':4,16,32 'date':177 'decim':113 'detail':159 'discov':186 'document':134 'dollar peso history' 'endpoint':26,73,189 'etc':180 'exact':174 'exchang':30 'exchange-r':29 'experiment':187 'financ':56 'forex':3,15 'forex historical data' 'forex-history' 'gate':62 'granular':179 'handl':82 'header':90 'histor':1,13,28 'http':198 'inlin':83 'json':79 'key':118 'land':137 'limit':121 'live':191 'lowpaymentfee.com':43 'make':133 'micropay':7,19 'must':184 'network':71 'no-api-key' 'offer':46 'openapi':161 'page':138,146 'paid':206 'pair':37 'paramet':176 'part':40 'pay':51,127 'pay-per-cal':50 'pay-per-call' 'payment':66,80,89,95 'per':11,23,52,102 'per-request-pricing' 'peso exchange rate' 'platform':44 'post':75 'protocol':67 'provid':27 'publish':171 'queri':175 'rang':178 'rate':31,120 'readi':203 'request':12,24,76,103,164,207 'request-bodi':163 'resolv':148 'respons':169,182 'return':78,193 'sampl':168 'schema':162 'shape':183 'sign':93 'span':55 'spars':140 'specif':166 'stub':154 'subscript':124 'suit':48 'technic':158 'unit':107 'usd-mxn' 'usd/mxn':2,14,35 'usdc':94,109 'usdc-settlement' 'util':60 'valid':195 'via':5,17,63 'wallet':152 'wallet-connect':151 'x':88 'x-payment':87 'x402':6,18,65,196 'x402-payment'","prices":[{"id":"5beae3b6-6f06-452e-9a6c-fbfc0a57eea1","listingId":"8c54226b-1438-48ce-b6b4-f768a1cd9c3f","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/USDMXN/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":"2026-04-18T18:46:49.133Z"}],"sources":[{"listingId":"8c54226b-1438-48ce-b6b4-f768a1cd9c3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDMXN/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:49.133Z","lastSeenAt":"2026-04-29T13:05:03.183Z"}],"details":{"listingId":"8c54226b-1438-48ce-b6b4-f768a1cd9c3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDMXN/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment>\" \\\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/USDMXN/history"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/USDMXN/history"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists Finance & Web3 APIs including price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve historical USD/MXN exchange rates for financial analysis","Feed forex history into trading bots or backtesting systems","Power dashboards that display peso-dollar trends over time","Provide FX data to AI agents that need currency context for Latin American markets"],"bestFor":["Developers needing on-demand forex history without subscription overhead","AI agents that can settle x402 micropayments on Base","Applications requiring USD/MXN historical data in JSON format"],"notFor":["Real-time streaming forex feeds (this is a request/response history endpoint)","Users who cannot transact in USDC on the Base network","Bulk historical data downloads where per-request pricing would be cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.549Z"},"updatedAt":"2026-04-29T13:05:03.183Z"}}