{"id":"f14bfee4-51c5-4741-b91c-019d5debc38a","shortId":"S52wEb","kind":"x402","title":"USD/JPY forex rate via x402 micropayment on Base, $0.02 per request.","tagline":"USD/JPY forex rate via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides USD/JPY foreign exchange rate data, accessible through the x402 payment protocol. It is part of a broader suite of APIs hosted at lowpaymentfee.com covering finance, analytics, AI/ML, crypto, and utility services. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or accounts are required — callers pay per request via an on-chain USDC micropayment.\n\nThe endpoint accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, advertising version 1 of the protocol with an \"exact\" payment scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the forex endpoint returns. The response format and available parameters (e.g., whether historical rates or only spot rates are supported) are unknown.","tags":[],"capabilities":["forex-rate","usd-jpy","x402-payment","usdc-base","micropayment","per-request-pricing","no-api-key"],"categories":["finance","forex"],"synonyms":["USD JPY exchange rate","dollar yen rate","forex API","currency exchange rate","FX rate","USDJPY spot price","foreign exchange data"],"warnings":["No OpenAPI or schema documentation available — request/response format is entirely unknown","Docs, pricing, and API pages all render only 'Connect wallet' with no technical content","No example responses available; actual data quality and fields returned cannot be verified","The broader lowpaymentfee.com site lists many diverse endpoints (AI, analytics, crypto, utils) all at $0.02 — unclear whether all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDJPY","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/USDJPY","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request or response, and no description of what the endpoint actually returns. Effectively a stub 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'000':62 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':133 '1':112 '20':61 '300':141 '6':74 'FX rate' 'USD JPY exchange rate' 'USDJPY spot price' 'accept':96 'access':31 'account':80 'address':125 'advertis':110 'ai/ml':52 'analyt':51 'api':45,77,151 'avail':188 'base':8,19,63,69,132 'broader':42 'caller':83 'chain':91 'challeng':104 'confirm':105 'connect':157 'contract':130 'cost':59 'cover':49 'crypto':53 'currency exchange rate' 'data':30 'decim':75 'descript':176 'detail':164 'doc':148 'document':143 'dollar yen rate' 'e.g':190 'endpoint':24,95,107,182 'exact':118 'exampl':171 'exchang':28 'extrem':145 'field':179 'financ':50 'foreign':27 'foreign exchange data' 'forex':2,13,181 'forex API' 'forex-rate' 'format':186 'histor':192 'host':46 'json':101 'key':78 'live':109 'lowpaymentfee.com':48 'maximum':135 'micropay':6,17,93 'micropayment' 'network':70 'no-api-key' 'on-chain':89 'openapi':168 'page':152 'paramet':189 'part':39 'pay':84 'payload':173 'payment':35,119,121,138 'per':10,21,85 'per-request-pricing' 'post':97 'price':149 'prompt':159 'protocol':36,115 'provid':25 'rate':3,14,29,193,197 'render':154 'request':11,22,58,86,98 'request/response':172 'requir':82 'respons':185 'return':100,183 'schema':169 'scheme':120 'second':142 'sent':123 'servic':56 'settlement':139 'spars':146 'spot':196 'suit':43 'support':199 'technic':163 'timeout':136 'unit':64 'unknown':201 'usd-jpy' 'usd/jpy':1,12,26 'usdc':66,72,92,129 'usdc-base' 'use':127 'util':55 'version':111 'via':4,15,87 'wallet':158 'whether':191 'x402':5,16,34,103 'x402-payment'","prices":[{"id":"f9e44a2c-b0dd-4217-bcd9-fbe65c9ab46f","listingId":"f14bfee4-51c5-4741-b91c-019d5debc38a","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/USDJPY","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:53.286Z"}],"sources":[{"listingId":"f14bfee4-51c5-4741-b91c-019d5debc38a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDJPY","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:53.286Z","lastSeenAt":"2026-04-29T13:05:03.355Z"}],"details":{"listingId":"f14bfee4-51c5-4741-b91c-019d5debc38a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDJPY \\\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 402 with x402 version 1 challenge advertising USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDJPY"},{"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, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/USDJPY"}],"useCases":["Fetching the current USD/JPY exchange rate for trading bots or financial dashboards","Integrating real-time forex data into agent workflows without API key management","Pay-per-call forex lookups for low-volume or sporadic usage patterns"],"bestFor":["Agents or bots that need on-demand USD/JPY rates without subscription commitments","Developers who prefer crypto micropayments over traditional API billing","Low-volume forex data consumers who want zero setup overhead"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk historical data","Users who need comprehensive multi-pair forex coverage from a single endpoint","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.312Z"},"updatedAt":"2026-04-29T13:05:03.355Z"}}