{"id":"2bd7375b-c4c9-41e5-8232-c16884a8de10","shortId":"XVTnaH","kind":"x402","title":"Crypto market quote for CAT token via x402 micropayment on Base, $0.02 per request.","tagline":"Crypto market quote for CAT token via x402 micropayment on Base, $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a market quote for the CAT token. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints are gated by the x402 protocol, requiring a per-call USDC micropayment on the Base network.\n\nThe specific endpoint `/api/v1/market/quote/CAT` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys are required; payment is handled entirely via the X-PAYMENT header. The provider advertises no rate limits and instant access.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the CAT quote response contains. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual response schema and supported request parameters are unknown.","tags":[],"capabilities":["crypto-market-quote","x402-payment","usdc-micropayment","base-network","per-request-pricing","no-api-key"],"categories":["finance","crypto"],"synonyms":["CAT token price","CAT market data","crypto quote API","token price feed","CAT coin quote","x402 crypto API","micropayment market data"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages are all empty (wallet-connect only).","No OpenAPI or output schema provided; response format for the CAT quote is unknown.","The 'CAT' token identity is unspecified — it is unclear which project or asset this refers to.","No SLA, rate-limit, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/CAT","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/CAT","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request parameters, no example responses, and all documentation pages are empty beyond a wallet-connect prompt. The actual content of the CAT quote response is entirely 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'/api/v1/market/quote/cat':91 '/docs':158 '/pricing':160 '/readme':162 '0.02':12,26,118 '000':107 '0x8335':112 '20':106 '2913':113 '402':203 '6':123 'CAT coin quote' 'CAT market data' 'CAT token price' 'accept':92 'access':148 'actual':211 'addit':173 'advertis':101,142 'ai/ml':62 'analyt':61 'api':53,126 'base':11,25,86,108,115 'base-network' 'beyond':150 'broader':46 'call':81 'cat':5,19,39,192 'challeng':100,208 'confirm':199 'connect':168 'contain':195 'cost':104 'crypto':1,15,65 'crypto quote API' 'crypto-market-quote' 'data':60 'decim':124 'descript':187 'detail':175 'document':149 'endpoint':30,70,90,197 'entir':133 'equal':117 'exampl':182 'extrem':155 'field':190 'financ':64 'gate':72 'handl':132 'header':139 'http':202 'infer':63 'instant':147 'json':97 'key':127 'land':152 'limit':145 'live':200 'lowpaymentfee.com':32 'market':2,16,35 'maximum':103 'micropay':9,23,83 'micropayment market data' 'network':87 'no-api-key' 'offer':54 'openapi':179 'page':153,163 'paramet':217 'part':43 'pay':50 'pay-per-request':49 'payload':184 'payment':130,138 'per':13,27,51,80,119 'per-cal':79 'per-request-pricing' 'post':93 'prompt':170 'protocol':76 'provid':33,58,141 'quot':3,17,36,193 'rate':144 'request':14,28,52,94,120,216 'request/response':183 'requir':77,129 'respons':194,212 'return':96,165,201 'schema':180,213 'servic':68 'span':59 'spars':156 'specif':89 'suit':47 'support':215 'technic':174 'token':6,20,40 'token price feed' 'unit':109 'unknown':219 'usdc':82,111,121 'usdc-micropayment' 'use':122 'util':67 'valid':206 'via':7,21,134 'wallet':169 'x':137 'x-payment':136 'x402':8,22,75,99,207 'x402 crypto API' 'x402-payment'","prices":[{"id":"800fa788-14a8-4238-9e7b-588ecc2eff21","listingId":"2bd7375b-c4c9-41e5-8232-c16884a8de10","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/CAT","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:38.756Z"}],"sources":[{"listingId":"2bd7375b-c4c9-41e5-8232-c16884a8de10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/CAT","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:38.756Z","lastSeenAt":"2026-04-23T20:01:22.972Z"}],"details":{"listingId":"2bd7375b-c4c9-41e5-8232-c16884a8de10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/CAT \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/market/quote/CAT"},{"claim":"All APIs are 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 USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/market/quote/CAT"}],"useCases":["Fetching a real-time market quote for the CAT token programmatically","Integrating CAT token pricing into a trading bot or portfolio tracker","Agent-driven price lookups without needing API key registration"],"bestFor":["Developers wanting keyless, pay-per-call crypto price data","AI agents that can settle x402 payments on Base","Quick one-off CAT token price checks without subscription commitments"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed historical OHLCV data (no evidence this endpoint provides it)","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:31:48.956Z"},"updatedAt":"2026-04-23T20:01:22.972Z"}}