{"id":"6a084b49-577c-438a-b39e-81f4a56e5c8e","shortId":"LVhMm4","kind":"x402","title":"x402-gated market quote endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated market quote endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides a market quote API accessible via the x402 payment protocol. The specific path `/api/v1/market/quote/F` falls under the site's Finance & Web3 category, which includes price feeds, exchange rates, token quotes, and gas estimates. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider site (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced uniformly at $0.02 per call. However, the specific endpoint probed here (`/api/v1/market/quote/F`) is not explicitly listed on the homepage — it may be an unlisted or variant route. The trailing `/F` in the path is unexplained in available documentation; it could represent a specific asset ticker or category filter, but this is unconfirmed.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation or sample responses, the exact input parameters and output format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","market-quote","per-request-pricing","no-api-key","crypto-finance"],"categories":["finance","crypto"],"synonyms":["market quote API","token price quote","crypto quote endpoint","x402 finance API","pay-per-call market data","USDC micropayment API","Base network API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no usable content — only a 'Connect wallet' prompt.","The specific endpoint path /api/v1/market/quote/F is not listed among the provider's advertised APIs on the homepage.","The trailing '/F' in the path is unexplained; its meaning is unknown.","No request body schema or response schema is available; input/output format must be discovered by trial.","No OpenAPI specification or machine-readable API description found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/F","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/F","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. The specific /market/quote/F path is not listed on the homepage. No request/response schema, no examples, and the meaning of the '/F' path segment is unknown. Score reflects a confirmed-live but undocumented 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'/api/v1/market/quote/f':47,149 '/docs':195 '/f':167 '/pricing':196 '/readme':199 '0.02':10,24,80,140 '000':84 '0x8335':77 '20':83 '2913':78 '402':236 '6':88 'Base network API' 'USDC micropayment API' 'access':38 'ai':128 'analyt':127 'api':37,91,124 'asset':181 'attach':100 'avail':174,224 'base':8,22,72,85 'base-network' 'broader':118 'call':142 'caller':98 'categori':55,184 'challeng':238 'confirm':231 'connect':205 'content':211 'contract':76 'could':177 'crawl':227 'crypto quote endpoint' 'crypto-finance' 'data':126 'decim':89 'document':175,190,241 'endpoint':6,20,30,146,229 'estim':66 'exact':246 'exampl':223 'exchang':60 'explicit':152 'extrem':192 'fall':48 'feed':59 'filter':185 'financ':53,131 'format':251 'gas':65 'gate':3,17,123 'header':105 'homepag':156 'host':116 'howev':143 'includ':57 'infrastructur':134 'input':247 'key':92 'learn':130 'limit':95 'list':153 'live':232 'lowpaymentfee.com':32,115 'machin':129 'market':4,18,35 'market quote API' 'market-quote' 'may':158 'network':73 'no-api-key' 'openapi':215 'output':250 'page':200 'paramet':248 'path':46,170 'pay':9,23 'pay-per-call market data' 'payment':42,67,104,110 'per':11,25,81,141 'per-request-pricing' 'price':58,137 'probe':147 'prompt':207 'proof':111 'proper':235 'protocol':43 'provid':33,113 'quot':5,19,36,63 'rate':61,94 'remain':252 'render':202 'repres':178 'request':12,26,82 'request/response':218 'requir':97 'respons':244 'return':233 'rout':164 'sampl':243 'schema':219 'settl':69 'simpli':99 'site':51,114 'span':125 'spars':193 'spec':216 'specif':45,145,180 'suit':119 'ticker':182 'token':62 'token price quote' 'trail':166 'unconfirm':189 'unexplain':172 'uniform':138 'unit':86 'unknown':253 'unlist':161 'usag':222 'usdc':14,28,75 'usdc-settlement' 'use':74 'util':135 'valid':108 'variant':163 'via':39 'wallet':206 'web3':54,132 'without':240 'x':103 'x-payment':102 'x402':2,16,41,109,122,237 'x402 finance API' 'x402-gated':1,15,121 'x402-payment'","prices":[{"id":"9476c658-0887-4d82-9c21-dd1afa4bb3da","listingId":"6a084b49-577c-438a-b39e-81f4a56e5c8e","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/F","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:21.304Z"}],"sources":[{"listingId":"6a084b49-577c-438a-b39e-81f4a56e5c8e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/F","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:21.304Z","lastSeenAt":"2026-04-24T07:02:21.893Z"}],"details":{"listingId":"6a084b49-577c-438a-b39e-81f4a56e5c8e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/F \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/market/quote/F"},{"claim":"The provider advertises $0.02 per request pricing 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/F"},{"claim":"Finance & Web3 category includes Price Feeds, Exchange Rates, Token Quotes, and Gas Estimates endpoints.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no API documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching real-time market quotes for financial assets or tokens","Integrating pay-per-call market data into trading bots or agents","Accessing crypto price data without API key registration"],"bestFor":["AI agents needing on-demand market quotes with crypto micropayments","Developers who want keyless, pay-as-you-go financial data access","Applications already using x402 protocol on Base network"],"notFor":["Users needing high-frequency bulk market data (no documented batch endpoints)","Anyone requiring detailed API documentation or guaranteed SLAs before integration","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.166Z"},"updatedAt":"2026-04-24T07:02:21.893Z"}}