{"id":"7b989b73-54f3-48b7-9730-ffefe16139ed","shortId":"xE64vK","kind":"x402","title":"USD/HKD forex exchange rate via x402 micropayment on Base network","tagline":"USD/HKD forex exchange rate via x402 micropayment on Base network","description":"This endpoint provides the current USD to HKD foreign exchange rate, accessible through the x402 payment protocol on the Base network. Each request costs $0.02 (20,000 base units of USDC on Base), with no API keys, rate limits, or subscriptions required — just a per-call micropayment.\n\nThe endpoint is hosted on lowpaymentfee.com, which offers a broad catalog of pay-per-request APIs spanning finance, AI/ML, data analytics, and utility services, all priced at $0.02 per call. This specific endpoint targets the USD/HKD currency pair and returns JSON. The x402 challenge confirms the endpoint is live, accepting POST requests, and settling payments in USDC (contract 0x8335…) on the Base L2 network.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response schema, and no description of the response payload structure. The endpoint is functional and discoverable, but consumers should expect to experiment with the request format and interpret the response without formal documentation.","tags":[],"capabilities":["forex-rate","usd-hkd","x402-payment","per-call-micropayment","base-network","usdc-settlement","no-api-key","json-response"],"categories":["finance","forex"],"synonyms":["USD HKD exchange rate","dollar to Hong Kong dollar","forex rate API","currency conversion","FX rate","USD HKD spot rate","foreign exchange rate"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc/pricing/README pages render only 'Connect wallet' with no content","No example request or response payloads are documented anywhere","The broader lowpaymentfee.com catalog lists many endpoints but none have detailed docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDHKD/rate","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/rate","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 confirms pricing, network, and asset details. However, there is no OpenAPI spec, no documented request/response schema, and all documentation pages beyond the landing page are empty stubs. The endpoint's actual response format must be 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'/pricing':143 '/readme':145 '0.02':45,97 '000':47 '0x8335':128 '20':46 'FX rate' 'USD HKD exchange rate' 'USD HKD spot rate' 'accept':119 'access':32 'addit':156 'ai/ml':88 'analyt':90 'api':56,85 'base':9,19,40,48,53,131 'base-network' 'beyond':135 'broad':78 'call':67,99 'catalog':79 'challeng':113 'confirm':114 'connect':151 'consum':183 'contract':127 'cost':44 'currenc':106 'currency conversion' 'current':25 'data':89 'descript':170 'detail':158 'discover':181 'document':134,198 'dollar to Hong Kong dollar' 'endpoint':22,70,102,116,177 'exampl':165 'exchang':3,13,30 'expect':185 'experi':187 'financ':87 'foreign':29 'foreign exchange rate' 'forex':2,12 'forex rate API' 'forex-rate' 'formal':197 'format':191 'function':179 'hkd':28 'host':72 'interpret':193 'json':110 'json-response' 'key':57 'l2':132 'land':137 'limit':59 'live':118 'lowpaymentfee.com':74 'micropay':7,17,68 'network':10,20,41,133 'no-api-key' 'offer':76 'openapi':162 'page':138,146 'pair':107 'pay':82 'pay-per-request':81 'payload':174 'payment':36,124 'per':66,83,98 'per-cal':65 'per-call-micropayment' 'post':120 'price':95 'prompt':153 'protocol':37 'provid':23 'rate':4,14,31,58 'render':148 'request':43,84,121,190 'request/response':166 'requir':62 'respons':173,195 'return':109 'schema':167 'servic':93 'settl':123 'span':86 'spars':140 'spec':163 'specif':101 'structur':175 'subscript':61 'target':103 'technic':157 'unit':49 'usd':26 'usd-hkd' 'usd/hkd':1,11,105 'usdc':51,126 'usdc-settlement' 'util':92 'via':5,15 'wallet':152 'without':196 'x402':6,16,35,112 'x402-payment'","prices":[{"id":"629ddfb8-183c-4dd3-b53d-bc8655e407c0","listingId":"7b989b73-54f3-48b7-9730-ffefe16139ed","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/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:52.680Z"}],"sources":[{"listingId":"7b989b73-54f3-48b7-9730-ffefe16139ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDHKD/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:52.680Z","lastSeenAt":"2026-04-29T13:05:03.315Z"}],"details":{"listingId":"7b989b73-54f3-48b7-9730-ffefe16139ed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDHKD/rate \\\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 HTTP 402 with x402 challenge confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD/rate"},{"claim":"Price is 20,000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD/rate"},{"claim":"Payment settles in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/forex/USDHKD/rate"},{"claim":"Site advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) contain only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"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 API key management","Embedding live FX data into dashboards or reports"],"bestFor":["AI agents needing on-demand forex data with no signup","Developers wanting pay-per-use currency rate access on Base","Applications requiring USD/HKD spot rates without subscription commitments"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk rate feeds","Users who need historical forex time-series data (only current rate is indicated)","Consumers without a Base-network USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.332Z"},"updatedAt":"2026-04-29T13:05:03.315Z"}}