{"id":"67ed90e0-5dc0-4fe6-a5b6-96856e1fd113","shortId":"ch67Vc","kind":"x402","title":"USD/SGD forex rate via x402 micropayment on Base for $0.02 per request.","tagline":"USD/SGD forex rate via x402 micropayment on Base for $0.02 per request.","description":"This endpoint provides the USD/SGD foreign exchange rate, accessible through the x402 payment protocol on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals) and requires no API keys, rate limits, or upfront commitments — you pay per call using USDC on Base.\n\nThe endpoint is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. The forex endpoint specifically serves the USDSGD currency pair, returning JSON. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to a specified Ethereum address on the Base L2 network.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint's actual response format must be inferred or discovered by making a paid request.","tags":[],"capabilities":["forex-rate","usd-sgd","x402-payment","base-network","usdc-settlement","per-request-pricing","no-api-key","json-response"],"categories":["finance","forex"],"synonyms":["USD SGD exchange rate","dollar to Singapore dollar","forex API","currency conversion","FX rate","USDSGD rate","foreign exchange rate API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","Response format for the forex endpoint is entirely undocumented and must be discovered empirically","The broader lowpaymentfee.com platform lists many endpoints but provides no technical documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDSGD","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/USDSGD","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network, but there is zero documentation on request parameters, response schema, or usage examples. Docs pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with only the challenge metadata and landing page to go 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'000':48 '20':47 '6':54 'FX rate' 'USD SGD exchange rate' 'USDSGD rate' 'accept':125 'access':33 'actual':185 'addit':165 'address':135 'ai/ml':91 'analyt':90 'api':59,83,151 'avail':181 'base':8,20,41,49,73,138 'base-network' 'beyond':142 'broader':80 'call':69 'challeng':119 'commit':65 'confirm':120 'connect':160 'cost':45 'currenc':113 'currency conversion' 'data':89,95 'decim':55 'detail':167 'discov':192 'doc':150 'document':141,176 'dollar to Singapore dollar' 'endpoint':26,75,108,122,183 'ethereum':134 'exampl':179 'exchang':31 'extrem':147 'finance/crypto':93 'foreign':30 'foreign exchange rate API' 'forex':2,14,107 'forex API' 'forex-rate' 'format':187 'infer':92,190 'json':116 'json-response' 'key':60 'l2':139 'land':144 'limit':62 'live':124 'lowpaymentfee.com':86 'make':194 'market':94 'micropay':6,18 'must':188 'network':42,140 'no-api-key' 'offer':84 'openapi':171 'page':145,155 'paid':196 'pair':114 'part':77 'pay':67 'payload':180 'payment':37,130 'per':11,23,68,104 'per-request-pricing' 'post':126 'price':100,152 'prompt':162 'protocol':38 'provid':27 'rate':3,15,32,61 'readm':154 'render':157 'request':12,24,44,105,127,197 'request/response':174 'requir':57 'respons':186 'return':115 'schema':175 'serv':110 'servic':98 'settl':129 'span':88 'spars':148 'spec':172 'specif':109 'specifi':133 'suit':81 'technic':166 'uniform':101 'unit':50 'upfront':64 'usd-sgd' 'usd/sgd':1,13,29 'usdc':52,71 'usdc-settlement' 'usdsgd':112 'use':70 'util':97 'via':4,16 'wallet':161 'x402':5,17,36,118 'x402-payment'","prices":[{"id":"2f6b4fe0-94b1-450f-bfb1-fee81c8cc801","listingId":"67ed90e0-5dc0-4fe6-a5b6-96856e1fd113","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/USDSGD","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:55.656Z"}],"sources":[{"listingId":"67ed90e0-5dc0-4fe6-a5b6-96856e1fd113","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDSGD","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:55.656Z","lastSeenAt":"2026-04-29T11:34:02.482Z"}],"details":{"listingId":"67ed90e0-5dc0-4fe6-a5b6-96856e1fd113","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDSGD \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/forex/USDSGD"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/USDSGD"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists forex under Finance & Web3 category alongside price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current USD to SGD exchange rate for financial applications","Programmatic forex data retrieval without API key management","Agent-driven currency conversion workflows that settle micropayments on Base","Embedding live FX rates into trading bots or dashboards"],"bestFor":["Developers needing simple pay-per-call forex data without subscriptions","AI agents that can settle x402 payments on Base","Low-volume or sporadic forex rate lookups at $0.02 each"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing","Users who need historical forex time-series data (no evidence this is supported)","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.25Z"},"updatedAt":"2026-04-29T11:34:02.482Z"}}