{"id":"02fb7f20-67cf-4b8d-8ba2-9f972e26b4f0","shortId":"LGyFRy","kind":"x402","title":"Historical USD/HKD forex data via x402 micropayment on Base, $0.02 per request.","tagline":"Historical USD/HKD forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical exchange-rate data for the USD/HKD currency pair. It is part of a broader suite of pay-per-request APIs hosted at lowpaymentfee.com, covering finance, analytics, AI/ML, and utility services. The endpoint is accessed via HTTP POST and is gated by the x402 payment protocol — no API keys or accounts are required. Instead, callers attach an X-PAYMENT header with a USDC payment on the Base network.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base. The x402 challenge specifies a 300-second payment timeout and uses the \"exact\" payment scheme.\n\nDocumentation is minimal — the provider's docs, pricing, and API pages all render only a wallet-connect prompt with no further detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure for historical forex data are unknown. Users should expect to experiment or contact the provider for integration details.","tags":[],"capabilities":["forex-history","usd-hkd","x402-payment","usdc-base","pay-per-request","no-api-key","micropayment"],"categories":["finance","forex"],"synonyms":["USD HKD exchange rate","dollar hong kong dollar history","forex historical data","currency pair history","FX rate API","USD to HKD"],"warnings":["No API documentation available — docs, pricing, and API pages only show a wallet-connect prompt","No OpenAPI or JSON schema for request or response bodies","Request body format for historical forex queries is unknown (date ranges, granularity, etc.)","Response structure is undocumented — cannot confirm what fields are returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDHKD/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/USDHKD/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The request body format and response structure are entirely 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'000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '20':104 '300':135 '402':189 '6':111 'FX rate API' 'USD HKD exchange rate' 'USD to HKD' 'access':64 'account':80 'address':120 'ai/ml':57 'analyt':56 'api':50,77,154 'attach':85 'avail':180 'base':9,21,97,106,129 'bodi':195 'broader':43 'caller':84 'chain':118 'challeng':132,190 'confirm':184 'connect':162 'contact':212 'contract':125 'cover':54 'currenc':36 'currency pair history' 'data':4,16,32,203 'decim':112 'detail':167,217 'doc':151 'document':145 'dollar hong kong dollar history' 'endpoint':26,62,182 'exact':142,193 'exampl':178 'exchang':30 'exchange-r':29 'expect':208 'experi':210 'financ':55 'forex':3,15,202 'forex historical data' 'forex-history' 'format':196 'gate':70 'header':90 'histor':1,13,28,201 'host':51 'http':66 'instead':83 'integr':216 'key':78 'live':185 'lowpaymentfee.com':53 'micropay':7,19 'micropayment' 'minim':147 'network':98 'no-api-key' 'on-chain':116 'openapi':171 'page':155 'pair':37 'part':40 'pay':47 'pay-per-request':46 'payload':179 'payment':74,89,94,113,137,143 'per':11,23,48,102 'post':67 'price':99,152 'prompt':163 'proper':188 'protocol':75 'provid':27,149,214 'rate':31 'render':157 'request':12,24,49,103,194 'request/response':174 'requir':82 'respons':198 'return':186 'schema':175 'scheme':144 'second':136 'servic':60 'settl':115 'spec':172 'specifi':133 'structur':199 'suit':44 'timeout':138 'unit':107 'unknown':205 'usd-hkd' 'usd/hkd':2,14,35 'usdc':93,109,124 'usdc-base' 'use':122,140 'user':206 'util':59 'via':5,17,65 'wallet':161 'wallet-connect':160 'x':88 'x-payment':87 'x402':6,18,73,131 'x402-payment'","prices":[{"id":"aef9288c-fca1-41b1-b107-c612adb74a90","listingId":"02fb7f20-67cf-4b8d-8ba2-9f972e26b4f0","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/USDHKD/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":"2026-04-18T18:46:46.740Z"}],"sources":[{"listingId":"02fb7f20-67cf-4b8d-8ba2-9f972e26b4f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDHKD/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:46.740Z","lastSeenAt":"2026-04-29T13:34:31.380Z"}],"details":{"listingId":"02fb7f20-67cf-4b8d-8ba2-9f972e26b4f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDHKD/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD/history"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and payment on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD/history"}],"useCases":["Retrieving historical USD/HKD exchange rates for financial analysis","Backtesting currency trading strategies with historical forex data","Building dashboards that display USD/HKD rate trends over time","Programmatic access to forex history without API key registration"],"bestFor":["Developers needing quick, keyless access to USD/HKD historical rates","Agents or bots that can settle x402 micropayments on Base","Projects requiring pay-as-you-go forex data without subscriptions"],"notFor":["Users who need real-time streaming forex quotes (this is historical data)","Applications that cannot settle USDC payments on the Base network","Users who need detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.567Z"},"updatedAt":"2026-04-29T13:34:31.380Z"}}