{"id":"7772627a-7c80-445e-8914-f7b4aacf170d","shortId":"v2yWdq","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/92` 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/92`), though the provider's landing page does not explicitly list this particular route among its advertised endpoints. The endpoint is live and returns a valid x402 challenge.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) via the \"exact\" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request. No API keys or rate limits are advertised; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The response MIME type is `application/json` and the endpoint accepts HTTP POST.\n\nThe broader lowpaymentfee.com platform advertises a uniform $0.02/request pricing model across all its endpoints with no minimums or commitments. However, documentation is extremely thin — there is no OpenAPI spec, no request/response schema documentation, and no examples of what the NFT endpoint actually returns. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional information.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","402 payment API","crypto-gated API"],"warnings":["The /api/v1/nfts/92 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose and response format are unknown.","No OpenAPI spec, request schema, or response schema is available anywhere.","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content.","The actual data returned by this endpoint is entirely undocumented; the NFT interpretation is inferred solely from the URL path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/92","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/92","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what the NFT endpoint returns, and the specific /nfts/92 route is not even listed on the provider's landing page. Effectively a stub 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'/api/v1/nfts/92':32 '/nfts/92':74 '/pricing':213 '/readme':215 '/request':175 '0.02':10,24,130,174 '000':122 '0x8335':112 '20':121 '2913':113 '402 payment API' '6':127 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':164 'across':178 'actual':209 'addit':227 'advertis':90,140,171 'ai/ml':53 'among':88 'analyt':52 'api':49,134 'appear':62 'application/json':160 'attach':143 'base':8,22,107,123 'base-network' 'broader':168 'call':48 'caller':141 'challeng':101 'collect':40 'commit':186 'connect':222 'contract':111 'crypto-gated API' 'data':5,19,51,68 'decim':128 'document':188,200 'endpoint':6,20,30,91,93,163,181,208 'equal':129 'exact':116 'exampl':203 'explicit':83 'extrem':190 'finance/web3':55 'gate':3,17 'header':148 'howev':187 'http':165 'infer':54,69 'inform':228 'infrastructur':57 'json-response' 'key':135 'land':79 'limit':138 'list':84 'live':95 'lowpaymentfee' 'lowpaymentfee.com':37,169 'maxamountrequir':119 'mime':157 'minim':221 'minimum':184 'model':177 'network':108 'nft':4,18,66,207 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':195 'page':80,216 'part':34 'particular':86 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payment':102,147,153 'per':11,25,47,131 'platform':38,170 'post':166 'price':176 'prompt':224 'proof':154 'protocol':44 'provid':77 'rate':137 'relat':67 'request':12,26,132 'request/response':198 'resolv':218 'resourc':61 'respons':156 'return':97,210 'rout':87 'schema':199 'scheme':117 'serv':64 'settl':104 'simpli':142 'span':50 'spec':196 'specif':60 'thin':191 'though':75 'type':158 'uniform':173 'unit':124 'url':72 'usdc':14,28,110 'usdc-settlement' 'use':109 'util':58 'valid':99,151 'via':114 'wallet':223 'x':146 'x-payment':145 'x402':2,16,43,100,152 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"5ad11552-68d0-412f-aaf8-aec46c0bd777","listingId":"7772627a-7c80-445e-8914-f7b4aacf170d","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.807Z"}],"sources":[{"listingId":"7772627a-7c80-445e-8914-f7b4aacf170d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.807Z","lastSeenAt":"2026-04-22T12:05:29.638Z"}],"details":{"listingId":"7772627a-7c80-445e-8914-f7b4aacf170d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/92 \\\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","source_url":"https://lowpaymentfee.com/api/v1/nfts/92"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/92"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/nfts/92 route is not listed among the provider's advertised endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for token ID 92 via a single paid API call","Integrating pay-per-request NFT data into an agent workflow without managing API keys","Programmatic access to NFT information settled in USDC on Base"],"bestFor":["Developers wanting zero-signup, pay-per-call NFT data access","AI agents that can handle x402 payment flows natively","Prototyping Web3 applications that need on-demand NFT lookups"],"notFor":["Bulk NFT data retrieval at scale (no documented batch endpoints or rate-limit info)","Users who need detailed documentation or guaranteed SLAs before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.071Z"},"updatedAt":"2026-04-22T12:05:29.638Z"}}