{"id":"e1495d9b-90a4-47fc-8914-fd531b34ae6c","shortId":"a3ukeu","kind":"x402","title":"Pay-per-call market quote API on Base, settled in USDC via x402 at $0.02/request.","tagline":"Pay-per-call market quote API on Base, settled in USDC via x402 at $0.02/request.","description":"The endpoint at `/api/v1/market/quote/V` is part of a broader suite of pay-per-call APIs hosted on lowpaymentfee.com. It is labeled \"Premium API Access\" and appears to serve market quote data, though the exact response schema and accepted request parameters are not documented in the crawled material. The endpoint is live and returns a standard x402 payment challenge when called without payment.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) with an \"exact\" scheme. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD. No API keys or rate limits are advertised; access is gated entirely by the x402 micropayment protocol. The provider's landing page lists a uniform $0.02/request price across all endpoints.\n\nThe provider offers additional endpoints spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, no OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["market-quote","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["finance","market-data"],"synonyms":["market quote","price quote","token quote","crypto quote","market data API","x402 API","micropayment API","USDC pay-per-call"],"warnings":["No OpenAPI or JSON schema available for request or response bodies","Documentation pages (/docs, /pricing, /README) return no useful content — only 'Connect wallet'","The specific meaning of the '/V' path segment in the endpoint URL is undocumented","No example responses available; actual data returned is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/V","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/market/quote/V","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documented request/response format, no example payloads, and the docs pages are empty. The purpose of the 'V' path segment and what data is actually returned are 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'/request':17,34,158 '0.02':16,33,130,157 '000':122 '0x8335':108 '20':121 '2913':109 '6':127 'USDC pay-per-call' 'accept':73 'access':59,140 'across':160 'addit':166 'advertis':139 'ai/ml':171 'amount':116 'analyt':170 'api':7,24,50,58,133 'appear':61 'base':9,26,103,123 'base-network' 'broader':43 'call':4,21,49,95,119 'challeng':93 'classif':175 'connect':217 'content':223 'contract':107 'convers':191 'crawl':81,206 'crypto quote' 'data':66,169 'decim':128 'detail':197 'doc':208 'document':78,198 'embed':176 'endpoint':36,84,162,167 'entir':143 'equal':129 'estim':185 'exact':69,112 'exampl':200 'exchang':180 'feed':179 'finance/web3':177 'found':203 'gas':184 'gate':142 'generat':192 'geocod':189 'host':51 'howev':193 'infer':172 'infrastructur':187 'key':134 'label':56 'land':152 'limit':137 'list':154 'live':86 'lowpaymentfee.com':53 'market':5,22,64 'market data API' 'market quote' 'market-quote' 'materi':82 'maximum':115 'micropay':147 'micropayment API' 'network':104 'no-api-key' 'offer':165 'openapi':195 'page':153,212 'paramet':75 'part':40 'pay':2,19,47 'pay-per-cal':1,18,46 'pay-per-call' 'payment':92,97,98 'per':3,20,48,118 'premium':57 'price':159,178,209 'price quote' 'prompt':219 'protocol':148 'provid':150,164 'quot':6,23,65,183 'rate':136,181 'readm':211 'request':74 'requir':117 'respons':70,201 'return':88,214 'schema':71,196 'scheme':113 'sentiment':173 'serv':63 'settl':10,27,100 'span':168 'standard':90 'substant':222 'suit':44 'summar':174 'though':67 'token':182 'token quote' 'uniform':156 'unit':124 'usd':131 'usdc':12,29,106 'usdc-settlement' 'use':105 'util':188 'valid':190 'via':13,30 'wallet':218 'without':96 'x402':14,31,91,146 'x402 API' 'x402-payment'","prices":[{"id":"80fa9c22-647c-40ca-afd4-8f00218d2830","listingId":"e1495d9b-90a4-47fc-8914-fd531b34ae6c","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/market/quote/V","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:25.911Z"}],"sources":[{"listingId":"e1495d9b-90a4-47fc-8914-fd531b34ae6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/V","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:25.911Z","lastSeenAt":"2026-04-22T10:01:09.561Z"}],"details":{"listingId":"e1495d9b-90a4-47fc-8914-fd531b34ae6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/V \\\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 requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/market/quote/V"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/market/quote/V"},{"claim":"Provider advertises $0.02/request uniform pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/market/quote/V"}],"useCases":["Fetching real-time or on-demand market quotes for assets","Integrating pay-per-call market data into trading bots or agents","Accessing financial data without API key registration"],"bestFor":["Agents or bots that need on-demand market quotes with no signup","Developers prototyping with x402 micropayment-gated APIs","Low-volume consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume market data consumers who need bulk pricing or websocket streams","Users who need detailed API documentation and response schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:01:27.494Z"},"updatedAt":"2026-04-22T10:01:09.561Z"}}