{"id":"84cc88c0-fdc3-4012-89f4-5e9a27d3c299","shortId":"JDHSx4","kind":"x402","title":"Historical USD/JPY forex data via x402 micropayment on Base, $0.02 per request.","tagline":"Historical USD/JPY forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical exchange rate data for the USD/JPY currency pair. It is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call APIs spanning finance, analytics, AI, and utilities. The endpoint is accessed via HTTP POST and is gated by the x402 payment protocol, settling in USDC on the Base network.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the X-PAYMENT header. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nThe endpoint returns JSON (mimeType: application/json). However, the specific request body schema (e.g., date range parameters, granularity options) and the response schema (e.g., OHLC candles, close prices, timestamps) are not documented in the crawled material. The platform's docs, pricing, and API pages all rendered only a wallet-connect prompt with no additional technical documentation. Users should expect to experiment with the POST body or contact the provider for details on supported query parameters.","tags":[],"capabilities":["forex-history","usd-jpy","x402-payment","usdc-base","pay-per-request","historical-exchange-rates","micropayment-api"],"categories":["finance","forex"],"synonyms":["USD JPY historical data","forex history API","dollar yen exchange rate","currency pair history","FX rate lookup","USDJPY time series"],"warnings":["No API documentation available — docs, pricing, and API pages all render only a wallet-connect prompt with no technical content.","Request body schema is unknown; the example request is speculative.","Response schema is unknown; no example response can be provided.","The specific forex data source and data quality/freshness are undisclosed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDJPY/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/USDJPY/history","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 pricing is clear ($0.02 USDC on Base per call). However, there is no OpenAPI schema, no documented request/response format, and the docs pages only show a wallet-connect prompt. The request body and response structure are entirely 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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/history","description":"Premium API 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