{"id":"0e32b443-886e-442f-9e63-94cc6ef89d86","shortId":"KKYMyY","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/91` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource appears to serve NFT-related data (inferred from the URL path `/nfts/91`), though no detailed documentation or response schema is available beyond the generic \"Premium API Access\" label.\n\nPayment is handled via the x402 protocol on the Base network. The endpoint accepts USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact,\" meaning each request requires a single micropayment. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nThe platform lists many other endpoints at similar $0.02 price points across categories like sentiment analysis, text summarization, geocoding, and crypto gas estimates. However, the crawled documentation pages (`/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual data returned by this NFT endpoint and its input parameters remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","nft-data","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","micropayment API","Base USDC API","pay-per-call NFT","lowpaymentfee"],"warnings":["No documentation available for this specific endpoint — request/response schema unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The purpose of /api/v1/nfts/91 is inferred solely from the URL path; actual functionality is unverified","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation of request parameters, response schema, or what data the /nfts/91 resource actually returns. The crawled docs pages were empty. This is effectively a stub 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'/api/v1/nfts/91':32 '/nfts/91':74 '/pricing':182 '/readme':183 '0.02':10,24,119,161 '000':114 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '20':113 '6':122 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':104 'access':89,144 'across':164 'actual':197 'advertis':143 'ai/ml':53 'amount':111 'analysi':168 'analyt':52 'api':49,88,137 'appear':62 'avail':83 'base':8,22,100,115 'base-network' 'beyond':84 'call':48 'categori':165 'collect':40 'connect':188 'content':194 'contract':106 'crawl':178 'crypto':173 'data':5,19,51,68,198 'decim':123 'detail':77 'document':78,179 'endpoint':6,20,30,103,158,203 'equal':118 'estim':175 'exact':128 'finance/web3':55 'gas':174 'gate':3,17,146 'generic':86 'geocod':171 'handl':93 'header':152 'howev':176 'infer':54,69 'infrastructur':57 'input':206 'key':138 'label':90 'like':166 'limit':141 'list':155 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':156 'maximum':110 'mean':129 'micropay':135 'micropayment API' 'network':101 'nft':4,18,66,202 'nft-data' 'nft-relat':65 'no-api-key' 'page':180 'paramet':207 'part':34 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payment':91,125,151 'per':11,25,47 'platform':38,154 'point':163 'premium':87 'price':162 'prompt':190 'protocol':44,97 'pure':147 'rate':140 'relat':67 'remain':208 'request':12,26,131 'requir':132 'resourc':61 'respons':80 'return':185,199 'schema':81 'scheme':126 'sentiment':167 'serv':64 'similar':160 'singl':134 'span':50 'specif':60 'substant':193 'summar':170 'text':169 'though':75 'undocu':209 'unit':116 'url':72 'usdc':14,28,105,120 'usdc-micropayment' 'use':121 'util':58 'via':94 'wallet':189 'x402':2,16,43,96,150 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"5f1a61c2-b1ee-4103-aa15-52704c4f25b5","listingId":"0e32b443-886e-442f-9e63-94cc6ef89d86","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.315Z"}],"sources":[{"listingId":"0e32b443-886e-442f-9e63-94cc6ef89d86","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.315Z","lastSeenAt":"2026-04-22T09:02:25.934Z"}],"details":{"listingId":"0e32b443-886e-442f-9e63-94cc6ef89d86","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/91 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/91"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/91"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists 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 token ID","Integrating NFT data into an agent workflow without managing API keys","Making one-off NFT data queries with per-request USDC micropayments"],"bestFor":["Agents that need keyless, pay-per-call NFT data access","Developers testing x402 protocol integrations on Base","Low-volume NFT data lookups where subscription APIs are overkill"],"notFor":["High-volume NFT indexing (no bulk/batch endpoint documented)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.194Z"},"updatedAt":"2026-04-22T09:02:25.934Z"}}