{"id":"b1a8bf23-35d7-45bb-83c6-327db5dbef09","shortId":"shrqtj","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/21` 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/21`), though the provider's landing page labels it generically as \"Premium API Access\" without detailing the response payload.\n\nPayment is handled via the x402 protocol on the Base network. The endpoint accepts USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint uses the POST method and returns `application/json`.\n\nThe broader lowpaymentfee.com platform lists roughly 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all priced at $0.02 per request. No OpenAPI schema, detailed documentation, or example responses were found during the crawl; the `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt. Because of this, the exact structure of the NFT response body is 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","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — response structure is entirely unknown","The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content","The endpoint path suggests NFT data but the provider labels it only 'Premium API Access' — actual functionality is unverified","No terms of service, SLA, or support information found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/21","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example request/response, and the actual data returned is unknown. The listing is effectively a stub with only the x402 challenge and a generic landing page to go 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'/api/v1/nfts/21':32 '/nfts/21':74 '/pricing':197 '/readme':199 '0.02':10,24,121,179 '000':116 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '16':163 '20':115 '6':124 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':106 'access':87 'across':165 'advertis':133 'ai':170 'ai/ml':53 'amount':113 'analyt':52,169 'api':49,86,127 'appear':62 'application/json':156 'attach':136 'base':8,22,102,117 'base-network' 'bodi':218 'broader':158 'caller':134 'categori':167 'collect':40 'connect':205 'contract':108 'crawl':194 'crypto-paid API' 'data':5,19,51,68,168 'decim':125 'detail':89,185 'document':186 'endpoint':6,20,30,105,149,164 'equal':120 'exact':212 'exampl':188 'financ':173 'finance/web3':55 'found':191 'four':166 'gate':3,17 'generic':83 'handl':95 'header':141 'infer':54,69 'infrastructur':57,175 'json-response' 'key':128 'label':81 'land':79 'learn':172 'limit':131 'list':161 'lowpaymentfee' 'lowpaymentfee.com':37,159 'machin':171 'maximum':112 'method':153 'network':103 'nft':4,18,66,216 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':183 'page':80,200 'part':34 'path':73 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payload':92 'payment':93,140,146 'per':11,25,47,180 'platform':38,160 'post':152 'premium':85 'premium API access' 'price':177 'prompt':207 'proof':147 'protocol':44,99 'provid':77 'rate':130 'relat':67 'request':12,26,48,181 'resourc':61 'respons':91,189,217 'return':155,202 'rough':162 'schema':184 'serv':64 'simpli':135 'span':50 'specif':60 'structur':213 'though':75 'unit':118 'unknown':220 'url':72 'usdc':14,28,107,122 'usdc-settlement' 'use':123,150 'util':58 'valid':144 'via':96 'wallet':206 'web3':174 'without':88 'x':139 'x-payment':138 'x402':2,16,43,98,145 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"7ab065d6-b59f-40f9-b67f-0a72a105295b","listingId":"b1a8bf23-35d7-45bb-83c6-327db5dbef09","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.880Z"}],"sources":[{"listingId":"b1a8bf23-35d7-45bb-83c6-327db5dbef09","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.880Z","lastSeenAt":"2026-04-22T18:33:27.190Z"}],"details":{"listingId":"b1a8bf23-35d7-45bb-83c6-327db5dbef09","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/21 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1 on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/21"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/nfts/21"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/21"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token (ID 21) on demand","Integrating pay-per-request NFT data into an AI agent workflow without managing API keys","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","Agents that need on-demand NFT data without subscription commitments","Low-volume, pay-as-you-go access to NFT information"],"notFor":["High-volume NFT data ingestion where per-call costs add up","Use cases requiring well-documented, schema-validated NFT responses","Production systems that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.699Z"},"updatedAt":"2026-04-22T18:33:27.190Z"}}