{"id":"025ba0fe-b0c1-4b02-86ba-6e4c54147fd7","shortId":"u926yY","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/27` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint appears to serve NFT-related data (resource ID 27), though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 \"exact\" scheme.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform $0.02/request pricing across all listed APIs. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nNote that the `/api/v1/nfts/27` endpoint is not listed on the provider's landing page among the advertised API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure). It may be an unlisted or supplementary endpoint. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific resource, so the exact input parameters and output format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","http-post"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee NFT","crypto-gated API"],"warnings":["Endpoint /api/v1/nfts/27 is not listed among the provider's advertised APIs on the landing page — may be unlisted or experimental.","No request parameters or response schema documented anywhere; actual output format is unknown.","No OpenAPI spec, README, or detailed docs were retrievable (pages behind wallet connect).","The provider site appears to be a generic multi-category API platform; the depth and reliability of each endpoint is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/27","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/nfts/27","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 documentation, no OpenAPI schema, no request/response examples, and the endpoint is not even listed on the provider's own landing page. The actual functionality behind /api/v1/nfts/27 is entirely 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'/request':133 '0.02':10,24,123,132 '000':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':90 '20':111 '27':71 '402':107 '6':118 'Base USDC API' 'NFT API' 'NFT data endpoint' 'access':150 'across':135 'advertis':141,181 'ai':186 'ai/ml':53 'among':179 'analyt':52,185 'api':49,138,143,182 'appear':62 'attach':153 'base':8,22,85,113 'base-network' 'caller':151 'categori':183 'challeng':105 'collect':40 'consist':126 'contract':89 'crypto-gated API' 'data':5,19,51,68,184 'decim':119 'detail':205 'document':79,206 'endpoint':6,20,30,61,97,169,198 'exact':74,94,215 'exampl':203 'financ':188 'finance/web3':55 'format':220 'found':208 'gate':3,17 'header':158 'http':106 'http-post' 'id':70 'infer':54 'infrastructur':57,190 'input':216 'instant':149 'key':144 'land':177 'limit':147 'list':137,172 'live':99 'lowpaymentfee NFT' 'lowpaymentfee.com':37 'maxamountrequir':109 'may':192 'ml':187 'network':86 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'note':165 'openapi':200 'output':219 'page':178 'paramet':217 'part':34 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payload':76 'payment':80,157,163 'per':11,25,47,124 'platform':38,129,140 'price':134 'proof':164 'protocol':44 'provid':175 'rate':146 'relat':67 'remain':221 'request':12,26,48,125 'request/response':202 'resourc':69,212 'respons':75 'return':101 'schema':201 'scheme':95 'serv':64 'settl':82 'simpli':152 'sinc':115 'span':50 'specif':60,211 'supplementari':197 'though':72 'translat':121 'uniform':131 'unit':114 'unknown':222 'unlist':195 'usdc':14,28,88,116 'usdc-settlement' 'use':87,117 'util':58 'valid':103,161 'via':91 'web3':189 'x':156 'x-payment':155 'x402':2,16,43,93,104,162 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"a2400d22-a26a-46e9-af49-9ada9f9e60f5","listingId":"025ba0fe-b0c1-4b02-86ba-6e4c54147fd7","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/nfts/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.801Z"}],"sources":[{"listingId":"025ba0fe-b0c1-4b02-86ba-6e4c54147fd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.801Z","lastSeenAt":"2026-04-22T20:02:12.989Z"}],"details":{"listingId":"025ba0fe-b0c1-4b02-86ba-6e4c54147fd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/27 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/27"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/27"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/nfts/27 endpoint is not listed among the provider's advertised API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token/collection","Integrating NFT data into agent workflows without managing API keys","Programmatic pay-per-request access to NFT information on Base"],"bestFor":["Agents or bots that need on-demand NFT data without subscription overhead","Developers testing x402 payment flows with low-cost endpoints","Web3 applications needing USDC-settled API access on Base"],"notFor":["Bulk NFT data retrieval requiring thousands of calls (no documented batch endpoint)","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto users who cannot generate x402 payment proofs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.82Z"},"updatedAt":"2026-04-22T20:02:12.989Z"}}