{"id":"d3bc9b00-e0a5-440f-ae65-53264929b894","shortId":"yX4sG3","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/23` 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 resource appears to serve NFT-related data (inferred from the URL path `/nfts/23`), 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 platform advertises a uniform $0.02/request pricing model across all its endpoints. Documentation is extremely thin — the landing page lists endpoints with one-line descriptions and prices, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. Because the NFT endpoint is not listed on the homepage, its exact functionality and response schema 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-gated API","micropayment API"],"warnings":["The /api/v1/nfts/23 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 on the site.","The /api, /pricing, and /README pages contain no useful documentation (only a 'Connect wallet' prompt).","Exact functionality of this endpoint is speculative based solely on the URL path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/23","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/23","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, but there is no OpenAPI spec, no documented request/response schema, no examples, and the specific /nfts/23 endpoint is not even listed on the provider's landing page. Functionality must be entirely inferred from the URL 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'/api/v1/nfts/23':32 '/nfts/23':74 '/pricing':207 '/readme':209 '/request':168 '0.02':10,24,130,167 '000':122 '0x8335':112 '20':121 '2913':113 '6':127 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':159 'access':141 'across':171 'addit':221 'advertis':90,140,164 'ai/ml':53 'among':88 'analyt':52 'api':49,134 'appear':62 'application/json':155 'base':8,22,107,123 'base-network' 'challeng':101 'collect':40 'connect':216 'content':222 'contract':111 'crypto-gated API' 'data':5,19,51,68 'decim':128 'descript':188 'document':175,200 'endpoint':6,20,30,87,93,158,174,183,226 'equal':129 'exact':116,234 'exampl':204 'explicit':83 'extrem':177 'finance/web3':55 'function':235 'gate':3,17 'grant':143 'header':149 'homepag':232 'http':160 'infer':54,69 'infrastructur':57 'json-response' 'key':135 'land':79,180 'limit':138 'line':187 'list':84,182,229 'live':95 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':119 'micropayment API' 'mime':152 'minim':215 'model':170 'network':108 'nft':4,18,66,225 'nft-data' 'nft-relat':65 'no-api-key' 'one':186 'one-lin':185 'openapi':195 'page':80,181,210 'part':34 'particular':86 'path':73 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payment':102,148 'per':11,25,47,131 'platform':38,163 'post':161 'price':169,190 'prompt':218 'protocol':44 'provid':77 'pure':144 'rate':137 'relat':67 'request':12,26,48,132 'request/response':198 'resolv':212 'resourc':61 'respons':151,237 'return':97 'rout':91 'schema':199,238 'scheme':117 'serv':64 'settl':104 'span':50 'spec':196 'specif':60 'thin':178 'though':75 'type':153 'uniform':166 'unit':124 'unknown':240 'url':72 'usag':203 'usdc':14,28,110 'usdc-settlement' 'use':109 'util':58 'valid':99 'via':114 'wallet':217 'x402':2,16,43,100,147 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"ed82d160-da2f-4041-9705-8d2e326f34cb","listingId":"d3bc9b00-e0a5-440f-ae65-53264929b894","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.820Z"}],"sources":[{"listingId":"d3bc9b00-e0a5-440f-ae65-53264929b894","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.820Z","lastSeenAt":"2026-04-22T20:02:12.989Z"}],"details":{"listingId":"d3bc9b00-e0a5-440f-ae65-53264929b894","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/23 \\\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/23"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/23"},{"claim":"The /api, /pricing, and /README pages resolve to minimal 'Connect wallet' content","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Fetching NFT metadata or details for token ID 23 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 on Base L2 with USDC"],"bestFor":["Developers wanting keyless, pay-per-request NFT data access","AI agents that can settle x402 payments on Base","Prototyping Web3 data integrations with minimal setup"],"notFor":["Bulk NFT data retrieval at scale (no documented batch endpoints or rate-limit info)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.779Z"},"updatedAt":"2026-04-22T20:02:12.989Z"}}