{"id":"ee845ed3-e951-4310-8448-0240f6afb98b","shortId":"KE32h2","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/28` 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 endpoint appears to serve NFT-related data (resource ID 28), 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-wide flat pricing of $0.02/request. The platform emphasizes no API keys, no rate limits, no minimums, and instant access. All endpoints are discoverable via HTTP POST with JSON responses.\n\nThe broader lowpaymentfee.com platform lists roughly 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure). However, the `/api/v1/nfts/28` path is not listed on the homepage, and no documentation, schema, or example responses are available for this specific endpoint. The endpoint is confirmed live — it returns a proper 402 challenge — but what data it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","json-response"],"categories":["web3","nft","data"],"synonyms":["NFT API","NFT data endpoint","pay-per-call NFT","x402 NFT","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation or schema available for /api/v1/nfts/28","This specific endpoint is not listed on the provider's homepage — it may be unlisted, experimental, or deprecated","Response payload structure is entirely unknown; no example responses available","The /pricing and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/28","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and the /api/v1/nfts/28 path isn't even listed on the provider's homepage. The actual data returned is completely 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'/request':129 '0.02':10,24,116,128 '000':105 '0x8335':90 '16':160 '20':104 '28':71 '2913':91 '402':205 '6':111 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'access':143 'across':162 'actual':211 'advertis':100 'ai':167 'ai/ml':53 'analyt':52,166 'api':49,134 'appear':62 'avail':191 'base':8,22,85,106 'base-network' 'broader':155 'call':48 'categori':164 'challeng':99,206 'collect':40 'confirm':199 'consist':119 'contract':89 'convert':114 'data':5,19,51,68,165,209 'decim':112 'discover':147 'document':79,185 'emphas':132 'endpoint':6,20,30,61,145,161,195,197 'exact':74,95 'exampl':188 'financ':170 'finance/web3':55 'flat':125 'four':163 'gate':3,17 'homepag':182 'howev':173 'http':149 'id':70 'infer':54 'infrastructur':57,172 'instant':142 'json':152 'json-response' 'key':135 'learn':169 'limit':138 'list':158,179 'live':200 'lowpaymentfee' 'lowpaymentfee.com':37,156 'machin':168 'maxamountrequir':102 'minimum':140 'network':86 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'part':34 'path':176 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payload':76 'payment':80,215 'per':11,25,47,117 'platform':38,131,157 'post':150 'price':126 'proper':204 'protocol':44 'rate':137 'relat':67 'request':12,26,118 'resourc':69 'respons':75,153,189 'return':202,212 'rough':159 'schema':186 'scheme':96 'serv':64 'settl':82 'sinc':108 'site':123 'site-wid':122 'span':50 'specif':60,194 'success':214 'though':72 'unit':107 'unknown':217 'upon':213 'usdc':14,28,88,109 'usdc-settlement' 'use':87,110 'util':58 'via':92,148 'web3':171 'wide':124 'x402':2,16,43,94,98 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"e3cd5dd9-6962-4130-8f10-469702ab6245","listingId":"ee845ed3-e951-4310-8448-0240f6afb98b","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.859Z"}],"sources":[{"listingId":"ee845ed3-e951-4310-8448-0240f6afb98b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.859Z","lastSeenAt":"2026-04-22T02:32:09.071Z"}],"details":{"listingId":"ee845ed3-e951-4310-8448-0240f6afb98b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/28 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/28"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/28"}],"useCases":["Fetching NFT metadata or details for a specific token/collection (ID 28)","Programmatic NFT data retrieval without API key registration","Agent-driven NFT lookups with automatic USDC micropayments on Base"],"bestFor":["Developers wanting keyless, pay-per-call NFT data access","AI agents that can settle x402 payments on Base","Quick one-off NFT data queries without subscription commitments"],"notFor":["Bulk NFT data scraping (no documented batch endpoints)","Users who need detailed API documentation or guaranteed SLAs","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.699Z"},"updatedAt":"2026-04-22T02:32:09.071Z"}}