{"id":"de1ed9bc-d624-4f53-9257-d7cb9dbc57d0","shortId":"wP7sWm","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/16` 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/16`), though the provider's landing page does not explicitly list this particular endpoint among its advertised APIs. 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 — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. 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. However, documentation is extremely thin: no OpenAPI spec, no request/response schema details, and no usage examples are provided for any endpoint. The actual data returned by `/api/v1/nfts/16` is unknown beyond the JSON content type.","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","lowpaymentfee NFT","Base USDC API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint on this platform","The /api/v1/nfts/16 endpoint is not listed among the provider's advertised APIs — its exact purpose is unknown","No request body schema or response schema is documented; actual data returned is unverified","The crawled /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/16","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/16","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 the specific NFT endpoint is not even listed on the provider's landing page. The actual functionality is entirely inferred from the URL 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'/nfts/16':74 '/request':175 '0.02':10,24,130,174 '000':122 '0x8335':112 '20':121 '2913':113 '402 payment API' '6':127 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':164 'across':178 'actual':219 'advertis':90,140,171 'ai/ml':53 'among':88 'analysi':186 'analyt':52 'api':49,91,134 'appear':62 'application/json':160 'attach':143 'base':8,22,107,123 'base-network' 'beyond':226 'broader':168 'caller':141 'categori':183 'challeng':101 'collect':40 'content':229 'contract':111 'data':5,19,51,68,220 'decim':128 'detail':208 'document':198 'embed':189 'endpoint':6,20,30,87,93,163,181,217 'equal':129 'estim':193 'exact':116 'exampl':212 'explicit':83 'extrem':200 'feed':191 'finance/web3':55 'gas':192 'gate':3,17 'geocod':194 'header':148 'howev':197 'http':165 'includ':184 'infer':54,69 'infrastructur':57 'json':228 'json-response' 'key':135 'land':79 'limit':138 'list':84 'live':95 'lowpaymentfee NFT' 'lowpaymentfee.com':37,169 'maxamountrequir':119 'mime':157 'model':177 'network':108 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':203 'page':80 'part':34 'particular':86 'path':73 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payment':102,147,153 'per':11,25,47,131 'platform':38,170 'post':166 'price':176,190 'proof':154 'protocol':44 'provid':77,214 'rate':137 'relat':67 'request':12,26,48,132 'request/response':206 'resourc':61 'respons':156 'return':97,221 'schema':207 'scheme':117 'sentiment':185 'serv':64 'settl':104 'simpli':142 'span':50 'spec':204 'specif':60 'summar':188 'text':187 'thin':201 'though':75 'type':158,230 'uniform':173 'unit':124 'unknown':225 'url':72 'usag':211 'usdc':14,28,110 'usdc-settlement' 'use':109 'util':58 'valid':99,151 'via':114 'x':146 'x-payment':145 'x402':2,16,43,100,152 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"6e4b143f-fe67-4de1-a1d1-3aa222d07374","listingId":"de1ed9bc-d624-4f53-9257-d7cb9dbc57d0","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.353Z"}],"sources":[{"listingId":"de1ed9bc-d624-4f53-9257-d7cb9dbc57d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.353Z","lastSeenAt":"2026-04-22T23:02:49.031Z"}],"details":{"listingId":"de1ed9bc-d624-4f53-9257-d7cb9dbc57d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/16 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/16"},{"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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/16"}],"useCases":["Fetching NFT metadata or details for a specific token ID via a pay-per-request model","Integrating NFT data into an agent workflow 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 micropayments on Base","Prototyping Web3 applications that need on-demand NFT info"],"notFor":["High-volume NFT data ingestion where per-call costs add up quickly","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.57Z"},"updatedAt":"2026-04-22T23:02:49.031Z"}}