{"id":"0dc31d4a-45cf-46db-8d84-c4ecf778df35","shortId":"eheYHA","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/33` 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 33), 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 returns a 402 Payment Required response with a max amount of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform $0.02/request pricing across all listed APIs. The endpoint accepts POST requests and requires no API keys or account registration — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The platform advertises no rate limits and instant access.\n\nThe broader lowpaymentfee.com platform offers roughly 16 endpoints across four categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), all at the same $0.02 price point. Documentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 output schema stub, and the `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The NFT endpoint specifically is not listed on the homepage's API catalog, making its exact functionality unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/nfts/33 endpoint is not listed on the provider's homepage API catalog — its exact functionality is unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","Request body format and response payload structure are entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/33","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/33","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what this NFT endpoint actually returns, and the endpoint is not even listed on the provider's homepage catalog. Effectively a stub 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'/api/v1/nfts/33':32 '/pricing':225 '/readme':227 '/request':138 '0.02':10,24,128,137,202 '000':117 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':90 '16':186 '20':116 '33':71 '402':107 '6':123 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'accept':146 'access':179 'account':155 'across':140,188 'addit':239 'advertis':173 'ai':193 'ai/ml':53 'amount':114 'analyt':52,192 'api':49,143,152,252 'appear':62 'attach':159 'bare':233 'base':8,22,85,118 'base-network' 'beyond':216 'broader':181 'caller':157 'catalog':253 'categori':190 'challeng':98 'collect':40 'confirm':99 'connect':234 'consist':131 'content':240 'contract':89 'data':5,19,51,68,191 'decim':124 'document':79,205 'endpoint':6,20,30,61,101,145,187,243 'exact':74,94,256 'financ':195 'finance/web3':55 'four':189 'function':257 'gate':3,17 'header':164 'homepag':250 'id':70 'infer':54 'infrastructur':57,197 'instant':178 'key':153 'limit':176 'list':142,247 'live':103 'lowpaymentfee' 'lowpaymentfee.com':37,182 'make':254 'max':113 'minim':207 'ml':194 'network':86 'nft':4,18,66,242 'nft-data' 'nft-relat':65 'no-api-key' 'offer':184 'openapi':211 'output':219 'page':228 'part':34 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payload':76 'payment':80,108,163,169 'per':11,25,47,129 'platform':38,134,172,183 'point':204 'post':147 'price':139,203 'prompt':236 'proof':170 'protocol':44 'rate':175 'registr':156 'relat':67 'request':12,26,48,130,148 'request/response':214 'requir':109,150 'resolv':230 'resourc':69 'respons':75,110 'return':105 'rough':185 'schema':215,220 'scheme':95 'serv':64 'settl':82 'simpli':158 'sinc':120 'span':50 'spec':212 'specif':60,244 'stub':221 'though':72 'translat':126 'unclear':258 'uniform':136 'unit':119 'usdc':14,28,88,121 'usdc-settlement' 'use':87,122 'util':58 'valid':167 'via':91 'wallet':235 'web3':196 'x':162 'x-payment':161 'x402':2,16,43,93,97,168,218 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"6a672354-8f54-4618-9b41-bda4ca19e929","listingId":"0dc31d4a-45cf-46db-8d84-c4ecf778df35","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.960Z"}],"sources":[{"listingId":"0dc31d4a-45cf-46db-8d84-c4ecf778df35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.960Z","lastSeenAt":"2026-04-22T18:05:11.012Z"}],"details":{"listingId":"0dc31d4a-45cf-46db-8d84-c4ecf778df35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/33 \\\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 maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/33"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/33"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The homepage lists ~16 API 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 via a single paid request","Integrating NFT data lookups into an AI agent workflow without managing API keys","Programmatic access to NFT information with crypto micropayments"],"bestFor":["Developers wanting keyless, pay-per-use NFT data access","AI agents that can settle x402 payments on Base","Quick one-off NFT data lookups without subscription commitments"],"notFor":["High-volume NFT indexing (no documented bulk endpoints or rate guarantees)","Users who need detailed API documentation or response schema before integrating","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.567Z"},"updatedAt":"2026-04-22T18:05:11.012Z"}}