{"id":"db91fcc3-6c70-4fd2-b95e-5f2db8d9fc60","shortId":"JvY8RH","kind":"x402","title":"Pay-per-call market quote API for crypto tokens, settled in USDC on Base via x402.","tagline":"Pay-per-call market quote API for crypto tokens, settled in USDC on Base via x402.","description":"The `/api/v1/market/quote/COIN` endpoint on lowpaymentfee.com provides market quote data for cryptocurrency tokens. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs—all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThis specific endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers attach an `X-PAYMENT` header containing a payment proof settled in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.\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 schema, no request/response examples, and no description of what parameters the POST body should contain or what fields the quote response includes. The `COIN` path segment presumably accepts a token symbol or identifier, but this is not documented.","tags":[],"capabilities":["crypto-market-quote","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["crypto price quote","token market data","coin quote API","cryptocurrency price feed","market data endpoint","x402 crypto API"],"warnings":["No documentation available—docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","Request body schema is unknown; the example request is inferred/guessed from the path pattern.","Response schema is completely unknown; no example response can be provided.","The path segment 'COIN' is ambiguous—unclear whether it is a literal path or a placeholder for a token symbol."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/COIN","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/COIN","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/call in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages return only a wallet-connect prompt. The actual behavior of the endpoint is almost entirely 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'0.02':67,131 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '20':121 '300':143 '6':127 'accept':83,203 'addit':169 'address':137 'ai/ml':57 'amount':116 'analyt':56 'api':7,24,63,72,155 'attach':97 'base':15,32,112,123 'base-network' 'beyond':146 'bodi':188 'broader':52 'call':4,21,119 'caller':96 'coin':199 'coin quote API' 'commit':79 'connect':164 'contain':103,190 'crypto':9,26 'crypto price quote' 'crypto-market-quote' 'cryptocurr':45 'cryptocurrency price feed' 'data':43,55 'decim':128 'descript':182 'detail':171 'doc':154 'document':145,213 'endpoint':37,82 'equal':130 'exampl':179 'extrem':151 'field':193 'finance/web3':59 'handl':91 'header':102 'identifi':208 'includ':197 'infer':58 'infrastructur':61 'json':88 'json-response' 'key':73 'land':148 'limit':76 'lowpaymentfee.com':39 'market':5,22,41 'market data endpoint' 'maximum':115 'network':113 'no-api-key' 'offer':54 'openapi':175 'page':149,159 'paramet':185 'part':49 'path':200 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'payment':89,101,105,133 'per':3,20,68,118 'platform':53 'post':84,187 'presum':202 'price':65,156 'prompt':166 'proof':106 'protocol':95 'provid':40 'quot':6,23,42,195 'rate':75 'readm':158 'render':161 'request':69,85 'request/response':178 'requir':117 'respons':196 'return':87 'schema':176 'second':144 'segment':201 'sent':135 'settl':11,28,107 'spars':152 'specif':81 'symbol':206 'technic':170 'timeout':141 'token':10,27,46,205 'token market data' 'unit':124 'usdc':13,30,109,126 'usdc-settlement' 'util':62 'via':16,33,92 'wallet':165 'x':100 'x-payment':99 'x402':17,34,94 'x402 crypto API' 'x402-payment'","prices":[{"id":"e0d135fb-0b66-4ccd-b637-831ca32de0a1","listingId":"db91fcc3-6c70-4fd2-b95e-5f2db8d9fc60","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/COIN","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:51.403Z"}],"sources":[{"listingId":"db91fcc3-6c70-4fd2-b95e-5f2db8d9fc60","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/COIN","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:51.403Z","lastSeenAt":"2026-04-24T05:31:49.278Z"}],"details":{"listingId":"db91fcc3-6c70-4fd2-b95e-5f2db8d9fc60","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/COIN \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{\"symbol\": \"ETH\"}'","exampleRequest":{"symbol":"ETH"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/market/quote/COIN"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/market/quote/COIN"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/market/quote/COIN"}],"useCases":["Fetching real-time market quotes for cryptocurrency tokens in automated trading bots","Retrieving token price data for portfolio dashboards without managing API keys","Agent-driven price lookups where per-call micropayments replace subscription billing"],"bestFor":["Agents or bots that need on-demand crypto quotes without subscription overhead","Developers wanting keyless, pay-per-use market data on Base network","Low-volume or bursty workloads where flat $0.02/call pricing is economical"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed historical OHLCV candle data (not evidenced by this endpoint)","Non-crypto callers who cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.522Z"},"updatedAt":"2026-04-24T05:31:49.278Z"}}