{"id":"b2899f1e-b041-4452-b2e7-410081acf6b8","shortId":"LYrw5R","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/54` 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/54`), though the provider's landing page does not explicitly list this particular endpoint among its advertised routes. 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; access is granted purely through the x402 payment header. 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 the `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt. The exact request body format and response structure for this NFT endpoint are unknown.","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","crypto NFT lookup","402 payment NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/nfts/54 path is not listed among the provider's advertised endpoints — its purpose is inferred from the URL only","Request body format and response structure are completely unknown","The /pricing, /README, and /api pages all resolve to a minimal 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/54","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/54","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 OpenAPI spec, no documented request/response schema, and the specific /nfts/54 endpoint is not even listed on the provider's landing page. Without knowing what data this returns or what request body it expects, this is effectively a stub 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'/api/v1/nfts/54':32 '/nfts/54':74 '/pricing':199 '/readme':201 '/request':170 '0.02':10,24,130,169 '000':122 '0x8335':112 '20':121 '2913':113 '402 payment NFT' '6':127 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':159 'access':141 'across':173 'advertis':90,140,166 'ai/ml':53 'among':88 'analyt':52 'api':49,134 'appear':62 'application/json':155 'base':8,22,107,123 'base-network' 'bodi':214 'broader':163 'call':48 'challeng':101 'collect':40 'commit':181 'connect':208 'contract':111 'crypto NFT lookup' 'data':5,19,51,68 'decim':128 'document':183,195 'endpoint':6,20,30,87,93,158,176,222 'equal':129 'exact':116,212 'explicit':83 'extrem':185 'finance/web3':55 'format':215 'gate':3,17 'grant':143 'header':149 'howev':182 'http':160 'infer':54,69 'infrastructur':57 'json-response' 'key':135 'land':79 'limit':138 'list':84 'live':95 'lowpaymentfee' 'lowpaymentfee.com':37,164 'maxamountrequir':119 'mime':152 'minim':207 'minimum':179 'model':172 'network':108 'nft':4,18,66,221 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':190 'page':80,202 'part':34 'particular':86 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payment':102,148 'per':11,25,47,131 'platform':38,165 'post':161 'price':171 'prompt':210 'protocol':44 'provid':77 'pure':144 'rate':137 'relat':67 'request':12,26,132,213 'request/response':193 'resolv':204 'resourc':61 'respons':151,217 'return':97 'rout':91 'schema':194 'scheme':117 'serv':64 'settl':104 'span':50 'spec':191 'specif':60 'structur':218 'thin':186 'though':75 'type':153 'uniform':168 'unit':124 'unknown':224 'url':72 'usdc':14,28,110 'usdc-settlement' 'use':109 'util':58 'valid':99 'via':114 'wallet':209 'x402':2,16,43,100,147 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"f35e6b09-de73-4011-ab8f-32e8494658ef","listingId":"b2899f1e-b041-4452-b2e7-410081acf6b8","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.473Z"}],"sources":[{"listingId":"b2899f1e-b041-4452-b2e7-410081acf6b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.473Z","lastSeenAt":"2026-04-22T15:03:11.965Z"}],"details":{"listingId":"b2899f1e-b041-4452-b2e7-410081acf6b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/54"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/54"}],"useCases":["Fetching NFT metadata or details on a per-request payment basis","Integrating NFT data into agent workflows without API key management","Programmatic access to NFT information settled via on-chain USDC micropayments"],"bestFor":["Agents or bots that need keyless, pay-as-you-go NFT data access","Developers experimenting with x402 protocol integrations","Low-volume NFT data lookups where subscription APIs are overkill"],"notFor":["High-volume NFT indexing (no documented bulk endpoints or rate advantages)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto-native consumers who cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.676Z"},"updatedAt":"2026-04-22T15:03:11.965Z"}}