{"id":"0cd6f1e1-73a1-49a0-a3d2-98136b90c49b","shortId":"Znps98","kind":"x402","title":"USD/HKD forex rate via x402 micropayment on Base, $0.02 per request.","tagline":"USD/HKD forex rate via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides the USD/HKD 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 accounts are required — callers authenticate and pay by attaching an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint accepts POST requests and returns JSON. It is part of a broader suite of APIs offered by lowpaymentfee.com spanning finance, AI/ML, data analytics, and utility services, all priced uniformly at $0.02 per request. The forex endpoint specifically serves the USD to Hong Kong Dollar exchange rate.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no example request/response payloads, and no documentation of the response format. The endpoint is confirmed live via a valid 402 challenge, but the actual data quality and response structure are unknown.","tags":[],"capabilities":["forex-rate","usd-hkd","x402-payment","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["finance","forex"],"synonyms":["USD HKD exchange rate","dollar to hong kong dollar","forex API","currency conversion","FX rate","exchange rate API","USD HKD rate"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages are all empty stubs showing only 'Connect wallet'.","No OpenAPI or JSON schema describing request parameters or response format.","Response data quality and freshness of forex rates are unverifiable from available materials.","No SLA, rate-limit, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDHKD","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","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages are empty stubs. The actual data returned is entirely 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'/docs':144 '/pricing':145 '/readme':148 '0.02':9,20,47,119 '000':49 '20':48 '402':185 '6':61 'FX rate' 'USD HKD exchange rate' 'USD HKD rate' 'accept':89 'account':67 'actual':189 'ai/ml':109 'analyt':111 'api':40,64,103 'attach':75 'authent':71 'base':8,19,50,56 'beyond':136 'broader':100 'call':39 'caller':70 'challeng':186 'confirm':180 'connect':154 'content':160 'cost':46 'currency conversion' 'data':110,190 'decim':62 'document':135,172 'dollar':132 'dollar to hong kong dollar' 'endpoint':24,88,124,178 'exampl':167 'exchang':29,133 'exchange rate API' 'extrem':141 'financ':108 'foreign':28 'forex':2,13,123 'forex API' 'forex-rate' 'format':176 'header':80 'hong':130 'host':41 'json':94 'json-response' 'key':65 'kong':131 'land':138 'live':181 'lowpaymentfee.com':43,106 'micropay':6,17 'network':57 'no-api-key' 'offer':104 'openapi':164 'page':139,149 'part':97 'pay':37,73 'pay-per-cal':36 'pay-per-call' 'payload':169 'payment':79,85 'per':10,21,38,120 'post':90 'price':116 'prompt':156 'proof':86 'protocol':35 'provid':25 'qualiti':191 'rate':3,14,30,134 'request':11,22,45,91,121 'request/response':168 'requir':69 'respons':175,193 'return':93,151 'schema':165 'serv':126 'servic':114 'span':107 'specif':125 'structur':194 'substant':159 'suit':101 'thin':142 'uniform':117 'unit':51 'unknown':196 'usd':128 'usd-hkd' 'usd/hkd':1,12,27 'usdc':53,59 'usdc-base' 'use':60 'util':113 'valid':83,184 'via':4,15,182 'wallet':155 'x':78 'x-payment':77 'x402':5,16,34,84 'x402-payment' 'x402-protocol':33","prices":[{"id":"a0bd03eb-85c5-42ea-89f5-ba9a7a7e749f","listingId":"0cd6f1e1-73a1-49a0-a3d2-98136b90c49b","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:48.503Z"}],"sources":[{"listingId":"0cd6f1e1-73a1-49a0-a3d2-98136b90c49b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDHKD","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:48.503Z","lastSeenAt":"2026-04-29T13:05:03.139Z"}],"details":{"listingId":"0cd6f1e1-73a1-49a0-a3d2-98136b90c49b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDHKD \\\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 a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD"}],"useCases":["Fetching the current USD/HKD exchange rate for financial applications","Programmatic currency conversion in trading bots or portfolio trackers","Agent-driven forex lookups without needing API key registration","Embedding real-time FX data into dashboards or reports"],"bestFor":["Developers needing quick, keyless access to USD/HKD rates","AI agents that can settle x402 micropayments 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)","Bulk historical forex data retrieval (only a single-pair endpoint)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.565Z"},"updatedAt":"2026-04-29T13:05:03.139Z"}}