{"id":"f2a04f2e-3e53-4417-a314-7a137d479765","shortId":"u5mG4K","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/20` 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 endpoint appears to serve NFT-related data (inferred from the URL path `/nfts/20`), 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 challenge advertises a maximum cost of 20,000 base units of USDC (contract `0x8335…2913`), which at 6 decimals equals $0.02 per request. No API keys or account registration are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader lowpaymentfee.com platform lists roughly 16 endpoints across four categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), all priced uniformly at $0.02 per request. No rate limits or minimum commitments are advertised. However, documentation is extremely sparse: there is no OpenAPI spec, no request/response schema, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content.","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","micropayment API","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","The endpoint description is generic ('Premium API Access') and does not describe what NFT data is returned.","All documentation pages (/api, /pricing, /README) resolve to a minimal 'Connect wallet' page with no useful content.","The NFT-specific functionality is inferred solely from the URL path; no confirmation of actual behavior exists."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a generic label, and no examples. The actual data returned by this NFT endpoint is entirely unknown, making it effectively a stub 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'/api/v1/nfts/20':32 '/nfts/20':74 '/pricing':208 '/readme':210 '0.02':10,24,123,178 '000':110 '0x8335':116 '16':162 '20':109 '2913':117 '6':120 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':150 'access':89 'account':130 'across':164 'addit':222 'advertis':104,188 'ai':169 'ai/ml':53 'analyt':52,168 'api':49,88,127 'appear':62 'application/json':155 'attach':136 'avail':83 'base':8,22,100,111 'base-network' 'beyond':84 'broader':157 'call':48 'caller':134 'categori':166 'challeng':103 'collect':40 'commit':186 'connect':217 'content':223 'contract':115 'cost':107 'crypto-gated API' 'data':5,19,51,68,167 'decim':121 'detail':77 'document':78,190 'endpoint':6,20,30,61,149,163 'equal':122 'exampl':205 'extrem':192 'financ':171 'finance/web3':55 'four':165 'gate':3,17 'generic':86 'handl':93 'header':141 'howev':189 'infer':54,69 'infrastructur':57,173 'json-response' 'key':128 'label':90 'limit':183 'list':160 'lowpaymentfee' 'lowpaymentfee.com':37,158 'maximum':106 'micropayment API' 'minim':216 'minimum':185 'ml':170 'network':101 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':197 'page':211 'part':34 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payment':91,140,146 'per':11,25,47,124,179 'platform':38,159 'post':151 'premium':87 'price':175 'prompt':219 'proof':147 'protocol':44,97 'rate':182 'registr':131 'relat':67 'request':12,26,125,152,180 'request/response':200 'requir':133 'resolv':213 'respons':80 'return':154 'rough':161 'schema':81,201 'serv':64 'simpli':135 'span':50 'spars':193 'spec':198 'specif':60 'though':75 'uniform':176 'unit':112 'url':72 'usag':204 'usdc':14,28,114 'usdc-settlement' 'util':58 'valid':144 'via':94 'wallet':218 'web3':172 'x':139 'x-payment':138 'x402':2,16,43,96,145 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"603f710e-6387-4ae0-81e9-f8b4e8b63570","listingId":"f2a04f2e-3e53-4417-a314-7a137d479765","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.839Z"}],"sources":[{"listingId":"f2a04f2e-3e53-4417-a314-7a137d479765","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.839Z","lastSeenAt":"2026-04-22T20:02:13.019Z"}],"details":{"listingId":"f2a04f2e-3e53-4417-a314-7a137d479765","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/20 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/20"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/20"},{"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 lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details by ID via a single paid API call","Integrating NFT data lookups into agent workflows without managing API keys","Programmatic access to NFT information settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call NFT data access","AI agents that can settle x402 payments on Base","Prototyping NFT-aware applications without subscription commitments"],"notFor":["High-volume NFT data ingestion where per-call costs add up quickly","Users who need detailed documentation, SDKs, or guaranteed SLAs","Anyone requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.775Z"},"updatedAt":"2026-04-22T20:02:13.019Z"}}