{"id":"75590ca2-63fa-459b-9882-49e08ff492e4","shortId":"jRbM5P","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/11` 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 endpoint appears to serve NFT-related data (resource ID 11), though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 \"exact\" scheme.\n\nThe x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The payment recipient is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises a uniform $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments. However, documentation is extremely sparse — there is no OpenAPI spec, no request/response schema, and no description of what the NFT endpoint actually returns. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional information.","tags":[],"capabilities":["x402-payment","nft-data","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No description of what data the /api/v1/nfts/11 endpoint actually returns","All documentation pages (/api, /pricing, /README) resolve to empty 'Connect wallet' prompts","Request body format and required fields are unknown","Response format and fields are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/11","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/11","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 of request parameters, response schema, or what NFT data is actually returned. No OpenAPI spec exists, and all doc pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/nfts/11':32 '/pricing':190 '/readme':192 '/request':148 '0.02':10,24,119,147 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':90 '11':71 '20':109 '300':131 '6':115 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':135 'across':151 'actual':186 'addit':204 'advertis':144 'ai/ml':53 'analyt':52 'api':49,156 'appear':62 'application/json':140 'base':8,22,85,111 'base-network' 'broader':142 'challeng':98 'collect':40 'commit':164 'confirm':99 'connect':199 'contract':89 'crypto-gated API' 'data':5,19,51,68 'decim':116 'descript':180 'document':79,166 'endpoint':6,20,30,61,101,134,153,185 'equal':118 'exact':74,94 'extrem':168 'finance/web3':55 'gate':3,17 'howev':165 'id':70 'infer':54 'inform':205 'infrastructur':57 'json-response' 'key':157 'limit':160 'live':103 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':107 'minim':198 'minimum':163 'model':150 'network':86 'nft':4,18,66,184 'nft-data' 'nft-relat':65 'openapi':173 'page':193 'part':34 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payload':76 'payment':80,123 'per':11,25,47,120 'platform':38,143 'post':136 'price':149 'prompt':201 'protocol':44 'rate':159 'recipi':124 'relat':67 'request':12,26,48,121,137 'request/response':176 'requir':105 'resolv':195 'resourc':69 'respons':75 'return':139,187 'schema':177 'scheme':95 'second':132 'serv':64 'settl':82 'span':50 'spars':169 'spec':174 'specif':60 'though':72 'timeout':129 'uniform':146 'unit':112 'usdc':14,28,88,114 'usdc-settlement' 'use':87 'util':58 'via':91 'wallet':200 'x402':2,16,43,93,97 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"8b888cb4-1b14-4be8-ad61-0831d181ee17","listingId":"75590ca2-63fa-459b-9882-49e08ff492e4","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.693Z"}],"sources":[{"listingId":"75590ca2-63fa-459b-9882-49e08ff492e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.693Z","lastSeenAt":"2026-04-22T19:33:08.520Z"}],"details":{"listingId":"75590ca2-63fa-459b-9882-49e08ff492e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/11 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/11"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/11"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/11"}],"useCases":["Fetching NFT metadata or details for a specific token/collection","Integrating NFT data into agent workflows without API key management","Programmatic access to NFT information with micropayment settlement"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Quick one-off NFT data lookups without subscription overhead","Developers exploring x402 protocol integrations"],"notFor":["Users needing documented request/response schemas before integration","High-volume NFT data consumers who need bulk pricing or rate guarantees","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.002Z"},"updatedAt":"2026-04-22T19:33:08.520Z"}}