{"id":"022e9837-9b80-4b28-b866-4866ad9318d0","shortId":"kGnWT5","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/66` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint appears to serve NFT-related data (resource ID 66), though the exact response payload is not documented. Payment is settled in USDC (contract `0x8335…2913` on Base) 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 broader lowpaymentfee.com platform advertises endpoints across several categories: data & analytics (metrics, reports, export, insights), AI & ML (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request. However, this specific listing covers only the `/api/v1/nfts/66` endpoint, whose response schema and exact data content are not documented in the crawled material.\n\nThe endpoint is live and returns a proper x402 challenge (HTTP 402) when called without payment. The x402 version is 1, the payment scheme is \"exact\", and the maximum timeout is 300 seconds. No OpenAPI spec, detailed documentation, or example responses were found during the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","no-rate-limit"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","micropayment API","crypto-gated API"],"warnings":["No documentation or OpenAPI schema available for this endpoint","Response payload and data content of /api/v1/nfts/66 are completely unknown","The broader platform lists many endpoint categories but none have detailed docs","No example responses were found in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/66","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/66","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 there is no documentation, no OpenAPI spec, no example responses, and no description of what data `/api/v1/nfts/66` actually returns. The listing is effectively a stub with only pricing and liveness 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'0.02':10,24,91,169 '000':95 '0x8335':86 '1':215 '20':94 '2913':87 '300':226 '402':206 '6':99 '66':71 'Base USDC API' 'NFT API' 'NFT data endpoint' 'across':129 'advertis':127 'ai':138 'analysi':141 'analyt':133 'api':49,102 'appear':62 'attach':111 'base':8,22,57,89,96 'base-network' 'broad':42 'broader':124 'call':48,208 'caller':109 'catalog':43 'categori':131 'challeng':204 'classif':144 'content':187 'contract':85 'convers':161 'cover':176 'crawl':193,240 'crypto-gated API' 'data':5,19,68,132,186 'decim':100 'detail':231 'document':79,190,232 'embed':145 'endpoint':6,20,30,61,128,164,180,196 'estim':155 'exact':74,185,220 'exampl':234 'exchang':150 'export':136 'feed':149 'financ':146 'found':237 'gas':154 'gate':3,17,50 'generat':162 'geocod':159 'header':116 'howev':172 'http':205 'id':70 'infrastructur':157 'insight':137 'key':103 'limit':106 'list':175 'live':198 'lowpaymentfee' 'lowpaymentfee.com':37,125 'materi':194 'maximum':223 'metric':134 'micropayment API' 'ml':139 'network':58 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':229 'part':34 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payload':76 'payment':80,115,121,210,217 'per':11,25,47,92,170 'platform':38,126 'price':148,167 'proof':122 'proper':202 'protocol':54 'quot':153 'rate':105,151 'relat':67 'report':135 'request':12,26,93,171 'requir':108 'resourc':69 'respons':75,182,235 'return':200 'schema':183 'scheme':218 'second':227 'sentiment':140 'serv':64 'settl':82 'sever':130 'simpli':110 'spec':230 'specif':60,174 'summar':143 'text':142 'though':72 'timeout':224 'token':152 'uniform':166 'unit':97 'usdc':14,28,84 'usdc-settlement' 'util':158 'valid':119,160 'version':213 'via':51 'web3':147 'whose':181 'without':209 'x':114 'x-payment':113 'x402':2,16,53,120,203,212 'x402 NFT' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e426c909-398c-4af2-84ba-847c8945a66b","listingId":"022e9837-9b80-4b28-b866-4866ad9318d0","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.630Z"}],"sources":[{"listingId":"022e9837-9b80-4b28-b866-4866ad9318d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.630Z","lastSeenAt":"2026-04-22T07:02:17.524Z"}],"details":{"listingId":"022e9837-9b80-4b28-b866-4866ad9318d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/66 \\\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 HTTP 402, x402Version 1, scheme 'exact', on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/66"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/nfts/66"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific resource on-demand","Integrating pay-per-call NFT data into agent workflows without managing API keys","Programmatic access to NFT information settled via USDC on Base"],"bestFor":["Agents or bots that need on-demand NFT data without subscription overhead","Developers experimenting with x402 payment-gated APIs","Low-volume, pay-as-you-go NFT data consumers"],"notFor":["High-volume NFT data ingestion where per-call pricing becomes expensive","Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.711Z"},"updatedAt":"2026-04-22T07:02:17.524Z"}}