{"id":"7533929c-0427-4973-83eb-1e019f52576d","shortId":"wZPgCu","kind":"x402","title":"USD/MXN forex rate via x402 micropayment on Base for $0.02 per request.","tagline":"USD/MXN forex rate via x402 micropayment on Base for $0.02 per request.","description":"This endpoint provides the USD/MXN foreign exchange rate through an x402-protocol pay-per-call API hosted at lowpaymentfee.com. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive the response.\n\nThe endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. This specific endpoint sits in the Finance & Web3 category and returns JSON. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments in USDC (contract 0x8335…2913) on the Base L2 network with a maximum timeout of 300 seconds.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, 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 actual data source for the USD/MXN rate is not disclosed.","tags":[],"capabilities":["forex-rate","usd-mxn","x402-payment","base-network","usdc-settlement","pay-per-call","json-response","no-api-key"],"categories":["finance","forex"],"synonyms":["USD MXN exchange rate","dollar peso rate","forex API","currency conversion","FX rate","Mexican peso rate","USDMXN"],"warnings":["No OpenAPI or schema documentation available","No example request or response payloads documented","Data source for USD/MXN rate is undisclosed","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","Response format and fields are unknown — only mimeType application/json is confirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDMXN","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no disclosed data source for the forex rate. Effectively a stub 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'/docs':174 '/pricing':175 '/readme':178 '0.02':10,22,49,119 '000':51 '0x8335':151 '20':50 '2913':152 '300':163 '6':63 'FX rate' 'Mexican peso rate' 'USD MXN exchange rate' 'USDMXN' 'accept':142 'actual':209 'addit':189 'ai/ml':107 'analyt':106 'api':42,66,100 'attach':75 'base':8,20,52,58,155 'base-network' 'beyond':166 'broader':97 'call':41 'caller':73 'categori':130 'challeng':136 'confirm':137 'connect':184 'contract':150 'cost':48 'currency conversion' 'data':105,111,210 'decim':64 'descript':203 'detail':191 'disclos':218 'document':165 'dollar peso rate' 'endpoint':26,92,124,139 'exampl':198 'exchang':31 'extrem':171 'financ':128 'finance/crypto':109 'foreign':30 'forex':2,14 'forex API' 'forex-rate' 'header':80 'host':43 'infer':108 'json':133 'json-response' 'key':67 'l2':156 'land':168 'limit':70 'live':141 'lowpaymentfee.com':45,103 'market':110 'maximum':160 'micropay':6,18 'network':59,157 'no-api-key' 'offer':101 'openapi':195 'page':169,179 'part':94 'pay':39 'pay-per-cal':38 'pay-per-call' 'payload':200 'payment':79,85,147 'per':11,23,40,120 'post':143 'price':116 'prompt':186 'proof':86 'protocol':37 'provid':27 'rate':3,15,32,69,215 'receiv':88 'render':181 'request':12,24,47,121,144 'request/response':199 'requir':72 'respons':90,206 'return':132 'schema':207 'second':164 'servic':114 'settl':146 'simpli':74 'sit':125 'sourc':211 'span':104 'spars':172 'spec':196 'specif':123 'suit':98 'technic':190 'timeout':161 'uniform':117 'unit':53 'usd-mxn' 'usd/mxn':1,13,29,214 'usdc':55,61,149 'usdc-settlement' 'use':62 'util':113 'valid':83 'via':4,16 'wallet':185 'web3':129 'x':78 'x-payment':77 'x402':5,17,36,84,135 'x402-payment' 'x402-protocol':35","prices":[{"id":"abd09267-efd3-493c-9d49-816d20666b61","listingId":"7533929c-0427-4973-83eb-1e019f52576d","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:48.513Z"}],"sources":[{"listingId":"7533929c-0427-4973-83eb-1e019f52576d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDMXN","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:48.513Z","lastSeenAt":"2026-04-29T13:05:03.164Z"}],"details":{"listingId":"7533929c-0427-4973-83eb-1e019f52576d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDMXN \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/USDMXN"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/forex/USDMXN"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDMXN"}],"useCases":["Fetching the current USD/MXN exchange rate for financial applications","Programmatic currency conversion in payment or remittance workflows","Agent-driven forex lookups without needing API key registration","Embedding live FX data into dashboards or trading bots"],"bestFor":["Developers needing quick, keyless access to USD/MXN rates","AI agents that can pay per call via x402 on Base","Low-volume or sporadic forex data needs at $0.02/call"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing historical forex time-series data (only current rate implied)","Anyone requiring detailed documentation or guaranteed data-source provenance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.552Z"},"updatedAt":"2026-04-29T13:05:03.164Z"}}