{"id":"b2c1e7c5-a192-4c68-82e7-b6cb519f7792","shortId":"2jpTEh","kind":"x402","title":"Pay-per-call financial price feeds via x402 on Base for $0.02/request in USDC.","tagline":"Pay-per-call financial price feeds via x402 on Base for $0.02/request in USDC.","description":"The `/api/v1/finance/prices` endpoint on lowpaymentfee.com provides financial price feed data accessible through the x402 payment protocol. Each request costs $0.02, paid in USDC on the Base network, with no API keys, rate limits, or subscriptions required. The endpoint accepts POST requests and returns JSON responses.\n\nThis endpoint is part of a broader platform offering 16+ pay-per-call APIs spanning finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), AI/ML (sentiment analysis, summarization, classification, embeddings), data analytics (metrics, reports, insights, data export), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what parameters the price feeds endpoint accepts or what data it returns. The x402 challenge confirms the endpoint is live and accepting payment, but the actual capabilities and data format remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","price-feeds","financial-data","pay-per-request","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["price feed API","financial prices","market data","exchange rates","crypto prices","x402 finance","pay-per-call price data","USDC API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI schema or request/response examples available","Unclear what financial instruments or data the price feeds endpoint covers","No information on data sources, freshness, or accuracy guarantees"],"endpointUrl":"https://lowpaymentfee.com/api/v1/finance/prices","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/finance/prices","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but documentation is effectively nonexistent — no request/response schema, no parameter descriptions, no examples. The actual data returned by the price feeds endpoint is 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'/request':14,30,129 '0.02':13,29,52,128 '16':87 'USDC API' 'accept':71,172,187 'access':43 'actual':191 'ai/ml':103 'analysi':105 'analyt':110 'api':62,92,138 'base':11,27,58 'broader':84 'call':4,20,91 'capabl':192 'challeng':180 'classif':107 'confirm':181 'connect':147 'content':153 'convers':121 'cost':51 'crypto prices' 'data':42,109,114,175,194 'descript':164 'doc':137 'document':132 'embed':108 'endpoint':35,70,79,124,171,183 'estim':102 'exampl':161 'exchang':97 'exchange rates' 'export':115 'extrem':134 'feed':7,23,41,96,170 'finance/web3':94 'financi':5,21,39 'financial prices' 'financial-data' 'format':195 'gas':101 'generat':122 'geocod':119 'infrastructur':117 'insight':113 'json':76 'json-response' 'key':63 'limit':65 'live':185 'lowpaymentfee.com':37 'market data' 'metric':111 'model':131 'network':59 'no-api-key' 'offer':86 'openapi':157 'page':142 'paid':53 'paramet':167 'part':81 'pay':2,18,89 'pay-per-cal':1,17,88 'pay-per-call price data' 'pay-per-request' 'payment':47,188 'per':3,19,90 'platform':85 'post':72 'price':6,22,40,95,130,139,169 'price feed API' 'price-feeds' 'prompt':149 'protocol':48 'provid':38 'quot':100 'rate':64,98 'readm':141 'remain':196 'render':144 'report':112 'request':50,73 'request/response':160 'requir':68 'respons':77 'return':75,177 'schema':158 'sentiment':104 'share':125 'span':93 'spars':135 'subscript':67 'summar':106 'token':99 'unclear':197 'usdc':16,32,55 'usdc-base' 'util':118 'valid':120 'via':8,24 'wallet':148 'x402':9,25,46,179 'x402 finance' 'x402-payment'","prices":[{"id":"7dd98380-55dd-4ac7-b3f2-b8942c3bd4e0","listingId":"b2c1e7c5-a192-4c68-82e7-b6cb519f7792","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/finance/prices","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:05.543Z"}],"sources":[{"listingId":"b2c1e7c5-a192-4c68-82e7-b6cb519f7792","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/finance/prices","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:05.543Z","lastSeenAt":"2026-04-24T06:31:45.249Z"}],"details":{"listingId":"b2c1e7c5-a192-4c68-82e7-b6cb519f7792","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/finance/prices \\\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 402 with x402 challenge accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/finance/prices"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 in USDC base units = 0.02 USDC)","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/finance/prices endpoint is listed under Finance & Web3 as 'Price Feeds'","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching real-time financial price data without API key registration","Agent-driven market data retrieval with per-call micropayments","Integrating price feeds into Web3 applications using on-chain payment"],"bestFor":["Developers wanting instant access to price data without signup","AI agents that need pay-as-you-go financial data","Web3 applications already operating on Base network"],"notFor":["High-frequency trading requiring sub-cent per-call costs or bulk pricing","Users needing well-documented APIs with clear request/response schemas","Applications requiring guaranteed SLAs or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.01Z"},"updatedAt":"2026-04-24T06:31:45.249Z"}}