{"id":"d32efcd1-482a-45ea-b9e9-2fbb0101d155","shortId":"hTUWqk","kind":"x402","title":"GBP/JPY historical forex data via x402 micropayment on Base, $0.02 per request.","tagline":"GBP/JPY historical forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical forex data for the GBP/JPY currency pair, accessible through the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform offering a variety of pay-per-request APIs spanning data analytics, AI/ML, finance, crypto, and utility services. All endpoints on the platform follow a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/forex/GBPJPY/history` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an `X-PAYMENT` header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys, accounts, or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the history endpoint accepts or returns. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation means callers must experiment or rely on conventions to determine the expected POST body and response format.","tags":[],"capabilities":["forex-history","gbp-jpy","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["finance","forex"],"synonyms":["GBP JPY historical data","pound yen exchange rate history","forex historical prices","currency pair history API","GBPJPY rate data"],"warnings":["No API documentation available — docs, API, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","No OpenAPI or JSON schema describing request parameters or response format.","Request body and response structure must be guessed or discovered experimentally.","The endpoint path suggests forex history but no details on supported date ranges, granularity, or fields are provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/GBPJPY/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/GBPJPY/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The actual request body format and response structure are completely unknown, making this effectively a stub 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