{"id":"0fb9edb2-6440-4658-87da-c10df0791e8c","shortId":"5mkchs","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/15` 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 15), though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the site's uniform $0.02/request pricing across all listed endpoints. No API keys or rate limits 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 platform markets itself as a no-commitment, pay-as-you-go API marketplace. However, documentation is extremely thin: there is no OpenAPI spec, no request/response schema, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The NFT endpoint specifically (`/api/v1/nfts/15`) is not listed on the homepage's catalog of available APIs, making its exact purpose unclear.","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 for this endpoint","The /api/v1/nfts/15 endpoint is not listed in the provider's own homepage catalog — its purpose and response format are unverified","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","Request body schema and response schema are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/15","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/15","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, and this specific NFT endpoint is not even listed on the provider's homepage. The actual data returned is 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'/api/v1/nfts/15':32,217 '/pricing':197 '/readme':199 '/request':126 '0.02':10,24,116,125 '000':105 '0x8335':90 '15':71 '20':104 '2913':91 '6':111 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':156 'across':128 'addit':211 'advertis':100 'ai/ml':53 'analyt':52 'api':49,133,176,228 'appear':62 'application/json':161 'attach':142 'avail':227 'bare':205 'base':8,22,85,106 'base-network' 'caller':140 'catalog':225 'challeng':99 'collect':40 'commit':170 'connect':206 'consist':119 'content':212 'contract':89 'convert':114 'crypto-gated API' 'data':5,19,51,68 'decim':112 'document':79,179 'endpoint':6,20,30,61,131,155,215 'exact':74,95,231 'exampl':194 'extrem':181 'finance/web3':55 'gate':3,17 'go':175 'header':147 'homepag':223 'howev':178 'id':70 'infer':54 'infrastructur':57 'json-response' 'key':134 'limit':137 'list':130,220 'lowpaymentfee' 'lowpaymentfee.com':37 'make':229 'market':164 'marketplac':177 'maxamountrequir':102 'micropayment API' 'network':86 'nft':4,18,66,214 'nft-data' 'nft-relat':65 'no-api-key' 'no-commit':168 'openapi':186 'page':200 'part':34 'pay':9,23,46,172 'pay-as-you-go':171 'pay-per-call NFT' 'pay-per-request':45 'payload':76 'payment':80,146,152 'per':11,25,47,117 'platform':38,163 'post':157 'price':127 'prompt':208 'proof':153 'protocol':44 'purpos':232 'rate':136 'relat':67 'request':12,26,48,118,158 'request/response':189 'requir':139 'resolv':202 'resourc':69 'respons':75 'return':160 'schema':190 'scheme':96 'serv':64 'settl':82 'simpli':141 'sinc':108 'site':122 'span':50 'spec':187 'specif':60,216 'thin':182 'though':72 'unclear':233 'uniform':124 'unit':107 'usag':193 'usdc':14,28,88,109 'usdc-settlement' 'use':87,110 'util':58 'valid':150 'via':92 'wallet':207 'x':145 'x-payment':144 'x402':2,16,43,94,98,151 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"8d4dc980-574a-4d4a-bfa1-e7a7d0a02d91","listingId":"0fb9edb2-6440-4658-87da-c10df0791e8c","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.452Z"}],"sources":[{"listingId":"0fb9edb2-6440-4658-87da-c10df0791e8c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.452Z","lastSeenAt":"2026-04-22T21:32:16.159Z"}],"details":{"listingId":"0fb9edb2-6440-4658-87da-c10df0791e8c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/15 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/15"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/15"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/nfts/15 endpoint is not listed among the homepage's available APIs","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token ID via a single paid request","Integrating pay-per-call NFT data into an agent workflow without managing API keys","Programmatic access to NFT information settled in USDC on Base"],"bestFor":["Agents or bots that need keyless, on-demand NFT data access","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer pay-per-request over subscriptions"],"notFor":["High-volume NFT data consumers who need bulk or streaming access","Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.44Z"},"updatedAt":"2026-04-22T21:32:16.159Z"}}