{"id":"40f30c25-3448-4579-b923-4393f595da75","shortId":"sV6jns","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/90` is part of the lowpaymentfee.com platform, a collection of x402 protocol-gated 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/90`), though the provider's landing page does not explicitly list this particular endpoint among its advertised API categories.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per request is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns `application/json` responses. No API keys or rate limits are advertised — access is granted purely through per-request micropayments.\n\nThe platform positions itself as a simple pay-per-use API service with no minimums, no commitments, and no authentication beyond the x402 payment header. Documentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and the `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt. The exact data returned by this NFT endpoint is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","nft-data","json-response","per-request-billing","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","micropayment API","Base USDC API","pay-per-call NFT","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/nfts/90 path is not listed among the provider's advertised API categories — its purpose and response format are unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","Request body format is undocumented; it is unclear what POST payload (if any) is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/90","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/90","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/request in 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 path `/api/v1/nfts/90` is not listed among the provider's advertised APIs. This is effectively a stub 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'/api/v1/nfts/90':32 '/nfts/90':71 '/pricing':196 '/readme':198 '0.02':10,24,120 '000':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':104 '20':112 '6':123 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':127 'access':142 'advertis':87,141 'ai/ml':50 'among':85 'amount':107 'analyt':49 'api':46,88,135,162 'appear':59 'application/json':132 'authent':171 'avail':219 'bare':204 'base':8,22,99,114 'base-network' 'beyond':172,188 'categori':89 'challeng':191 'collect':40 'commit':168 'connect':205 'contract':103 'data':5,19,48,65,210 'decim':124 'document':177 'endpoint':6,20,30,84,126,215 'equal':119 'exact':209 'explicit':80 'finance/web3':52 'gate':3,17,45 'grant':144 'handl':92 'header':176 'infer':51,66 'infrastructur':54 'json-response' 'key':136 'land':76 'limit':139 'list':81 'lowpaymentfee' 'lowpaymentfee.com':37 'materi':220 'maximum':106 'metadata':192 'micropay':150 'micropayment API' 'minim':179 'minimum':166 'network':100 'nft':4,18,63,214 'nft-data' 'nft-relat':62 'no-api-key' 'openapi':183 'page':77,199 'part':34 'particular':83 'path':70 'pay':9,23,159 'pay-per-call NFT' 'pay-per-us':158 'payment':90,175 'per':11,25,109,148,160 'per-request':147 'per-request-billing' 'platform':38,152 'posit':153 'post':128 'prompt':207 'protocol':44,96 'protocol-g':43 'provid':74 'pure':145 'rate':138 'relat':64 'request':12,26,110,129,149 'request/response':186 'requir':108 'resolv':201 'resourc':58 'respons':133 'return':131,211 'schema':187 'serv':61 'servic':163 'simpl':157 'span':47 'spec':184 'specif':57 'though':72 'unit':115 'unknown':217 'url':69 'usdc':14,28,102,117,121 'usdc-micropayment' 'use':101,122,161 'util':55 'via':93 'wallet':206 'x402':2,16,42,95,174,190 'x402 NFT' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b12f789d-aab0-49d6-91d3-a37c492ca582","listingId":"40f30c25-3448-4579-b923-4393f595da75","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.462Z"}],"sources":[{"listingId":"40f30c25-3448-4579-b923-4393f595da75","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.462Z","lastSeenAt":"2026-04-22T09:02:26.209Z"}],"details":{"listingId":"40f30c25-3448-4579-b923-4393f595da75","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/90 \\\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 x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/90"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/90"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list an NFT endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details via a pay-per-request model","Integrating NFT data into agent workflows without managing API keys","Programmatic access to NFT information settled on Base L2"],"bestFor":["Agents or bots that need on-demand NFT data without subscription overhead","Developers experimenting with x402 micropayment protocols","Low-volume or sporadic NFT data lookups where per-call pricing is economical"],"notFor":["High-volume NFT data pipelines where bulk pricing would be cheaper","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.961Z"},"updatedAt":"2026-04-22T09:02:26.209Z"}}