{"id":"597b0c34-9e21-4712-9154-bb2be8a4b041","shortId":"zMtp37","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/19` 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/19`), 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 categories including sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. Documentation beyond the landing page is sparse — the `/api`, `/pricing`, and `/README` routes all return only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are provided by the site.","tags":[],"capabilities":["x402-payment","usdc-base","nft-data","pay-per-request","json-response","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","crypto-paid API"],"warnings":["The /api/v1/nfts/19 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 from the provider.","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content.","The actual data returned by this endpoint is unverified; 'NFT data' is inferred solely from the URL path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/19","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/19","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 documentation, no OpenAPI spec, no request/response schema, and no examples. The specific /nfts/19 endpoint is not even listed on the provider's landing page, making its actual functionality uncertain. This is effectively a stub 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'/api/v1/nfts/19':32 '/nfts/19':74 '/pricing':201 '/readme':203 '/request':170 '0.02':10,24,130,169 '000':122 '0x8335':112 '20':121 '2913':113 '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 'analysi':181 'analyt':52 'api':49,134 'appear':62 'application/json':155 'base':8,22,107,123 'beyond':193 'broader':163 'call':48 'categori':178 'challeng':101 'collect':40 'connect':209 'contract':111 'crypto-paid API' 'data':5,19,51,68 'decim':128 'detail':216 'document':192 'embed':184 'endpoint':6,20,30,87,93,158,176 'equal':129 'estim':188 'exact':116 'exampl':224 'explicit':83 'feed':186 'finance/web3':55 'gas':187 'gate':3,17 'geocod':189 'grant':143 'header':149 'http':160 'includ':179 'infer':54,69 'infrastructur':57 'json-response' 'key':135 'land':79,195 'limit':138 'list':84 'live':95 'lowpaymentfee' 'lowpaymentfee.com':37,164 'maxamountrequir':119 'mime':152 'model':172 'network':108 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':218 'page':80,196 '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':171,185 'prompt':211 'protocol':44 'provid':77,226 'pure':144 'rate':137 'relat':67 'request':12,26,132 'request/response':220 'resourc':61 'respons':151 'return':97,206 'rout':91,204 'schema':221 'scheme':117 'sentiment':180 'serv':64 'settl':104 'site':229 'span':50 'spars':198 'spec':219 'specif':60 'summar':183 'technic':215 'text':182 'though':75 'type':153 'uniform':168 'unit':124 'url':72 'usag':223 'usdc':14,28,110 'usdc-base' 'use':109 'util':58 'valid':99 'via':114 'wallet':210 'x402':2,16,43,100,147 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"1f00b7b0-20a1-423a-9c84-23464e83379a","listingId":"597b0c34-9e21-4712-9154-bb2be8a4b041","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.430Z"}],"sources":[{"listingId":"597b0c34-9e21-4712-9154-bb2be8a4b041","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.430Z","lastSeenAt":"2026-04-22T21:32:16.134Z"}],"details":{"listingId":"597b0c34-9e21-4712-9154-bb2be8a4b041","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/19 \\\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 network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/19"},{"claim":"The platform advertises $0.02/request uniform 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/19"}],"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 on Base L2 with USDC"],"bestFor":["Agents or bots that need on-demand NFT data without subscription overhead","Developers experimenting with x402 payment protocol integrations","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["High-volume NFT indexing where per-request costs add up quickly","Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.45Z"},"updatedAt":"2026-04-22T21:32:16.134Z"}}