{"id":"001e295a-6b1c-452b-8931-21017325665d","shortId":"dknKER","kind":"x402","title":"Pay-per-call GBP/USD forex rate via x402 on Base, settled in USDC at $0.02/request.","tagline":"Pay-per-call GBP/USD forex rate via x402 on Base, settled in USDC at $0.02/request.","description":"This endpoint provides the current GBP/USD foreign exchange rate through a simple POST request, payable per call using the x402 protocol on the Base network. Payment is settled in USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or account registration are required — callers attach an X-PAYMENT header with a valid x402 payment proof and receive a JSON response with the exchange rate.\n\nThe endpoint is part of a broader suite of APIs hosted at lowpaymentfee.com, which includes finance, analytics, AI/ML, crypto, and utility endpoints, all priced uniformly at $0.02 per request. The platform advertises no rate limits and instant access. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so there is no detailed schema, example request/response, or error documentation available.\n\nThe x402 challenge was successfully captured, confirming the endpoint is live and accepting payment-gated requests. The output schema indicates the endpoint expects HTTP POST. The specific response format for the forex rate is not documented, so consumers should expect a JSON object containing the GBP/USD rate but will need to discover the exact shape empirically.","tags":[],"capabilities":["forex-rate","gbp-usd","x402-payment","usdc-settlement","base-network","pay-per-call","real-time-data"],"categories":["finance","forex"],"synonyms":["GBP USD exchange rate","pound dollar rate","forex API","currency conversion","FX rate","foreign exchange rate API","GBPUSD spot rate"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","Response schema for the forex rate endpoint is undocumented; consumers must discover the format empirically","No SLA, uptime guarantees, or data source attribution provided","The broader platform lists many endpoints but none appear to have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/GBPUSD/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/GBPUSD/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 pricing is clear ($0.02 USDC per call on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual response shape must be discovered 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'0.02':16,33,72,138 '000':76 '0x8335':66 '20':75 '2913':67 '6':80 'FX rate' 'GBP USD exchange rate' 'GBPUSD spot rate' 'accept':190 'access':149 'account':86 'advertis':143 'ai/ml':129 'analyt':128 'api':83,121 'attach':91 'avail':177 'base':11,28,58,77 'base-network' 'beyond':152 'broader':118 'call':4,21,51 'caller':90 'captur':183 'challeng':180 'confirm':184 'connect':164 'consum':216 'contain':222 'contract':65 'cost':70 'crypto':130 'currency conversion' 'current':39 'decim':81 'detail':170 'discov':230 'doc/pricing/api':160 'document':151,176,214 'empir':234 'empti':158 'endpoint':36,113,133,186,200 'error':175 'essenti':157 'exact':232 'exampl':172 'exchang':42,110 'expect':201,218 'financ':127 'foreign':41 'foreign exchange rate API' 'forex':6,23,210 'forex API' 'forex-rate' 'format':207 'gate':193 'gbp-usd' 'gbp/usd':5,22,40,224 'header':96 'host':122 'howev':150 'http':202 'includ':126 'indic':198 'instant':148 'json':106,220 'key':84 'land':154 'limit':146 'live':188 'lowpaymentfee.com':124 'need':228 'network':59 'object':221 'output':196 'page':155,161 'part':115 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'payabl':49 'payment':60,95,101,192 'payment-g':191 'per':3,20,50,73,139 'platform':142 'post':47,203 'pound dollar rate' 'price':135 'proof':102 'protocol':55 'provid':37 'rate':7,24,43,111,145,211,225 'real-time-data' 'receiv':104 'registr':87 'request':48,74,140,194 'request/response':173 'requir':89 'respons':107,206 'schema':171,197 'settl':12,29,62 'shape':233 'show':163 'simpl':46 'specif':205 'success':182 'suit':119 'uniform':136 'unit':78 'usdc':14,31,64 'usdc-settlement' 'use':52 'util':132 'valid':99 'via':8,25 'wallet':165 'x':94 'x-payment':93 'x402':9,26,54,100,179 'x402-payment'","prices":[{"id":"264e95e2-63a5-4235-af1a-8027395076d5","listingId":"001e295a-6b1c-452b-8931-21017325665d","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/GBPUSD/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":"2026-04-18T18:46:43.174Z"}],"sources":[{"listingId":"001e295a-6b1c-452b-8931-21017325665d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:43.174Z","lastSeenAt":"2026-04-29T13:34:31.192Z"}],"details":{"listingId":"001e295a-6b1c-452b-8931-21017325665d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate \\\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 402 with x402 challenge, confirming it is live and payment-gated","source_url":"https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 in USDC with 6 decimals on Base)","source_url":"https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate"},{"claim":"Platform advertises no API keys, no rate limits, instant access, $0.02/request uniform pricing","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate"}],"useCases":["Fetching the current GBP/USD exchange rate for trading bots or financial dashboards","Programmatic currency conversion in payment or invoicing applications","AI agents needing real-time forex data without API key management","Embedding live FX rates into spreadsheets or reports"],"bestFor":["Agents or apps needing on-demand GBP/USD rates without subscription commitments","Developers who prefer crypto-native pay-per-call billing over traditional API keys","Low-volume or bursty forex data consumers who want no minimums"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk historical data","Users who need comprehensive multi-pair forex coverage from a single documented API","Anyone requiring detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.848Z"},"updatedAt":"2026-04-29T13:34:31.192Z"}}