{"id":"240960bf-372d-46b0-bff8-4f78a471ca47","shortId":"w5LSZ6","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/12` 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 resource appears to serve NFT-related data (resource ID 12), 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 is live and 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 advertises no API keys, no rate limits, and instant access; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is minimal. The landing page lists many endpoints across categories but provides no request/response schemas, parameter descriptions, or example payloads for any of them. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. Because of this, the actual data returned by `/api/v1/nfts/12` is unknown — it could be metadata for a specific NFT, a collection summary, or something else entirely. Prospective callers should be prepared to experiment or contact the provider for details.","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 metadata","x402 NFT endpoint","pay-per-call NFT","Base USDC API","lowpaymentfee","402 payment API","crypto-gated API"],"warnings":["No documentation exists for the /api/v1/nfts/12 endpoint — its purpose and response format are unknown.","The /api/v1/nfts/ path is not listed among the provider's advertised endpoints on the landing page.","All secondary pages (/api, /pricing, /README) render only a 'Connect wallet' prompt with no useful content.","No OpenAPI spec, no request/response examples, and no parameter descriptions are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually returns — no request schema, no response schema, no examples. The NFT-specific path is not mentioned anywhere on the landing page, and all doc pages are empty. This is effectively a stub 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'/api/v1/nfts/12':32,218 '/pricing':194 '/readme':196 '/request':132 '0.02':10,24,119,131 '000':108 '0x8335':90 '12':71 '20':107 '2913':91 '402 payment API' '6':114 'Base USDC API' 'NFT API' 'NFT metadata' 'accept':161 'access':144 'across':176 'actual':214 'addit':208 'advertis':103,135 'ai/ml':53 'analyt':52 'api':49,137 'appear':62 'application/json':166 'attach':147 'bare':202 'base':8,22,85,109 'base-network' 'call':48 'caller':145,237 'categori':177 'challeng':99 'collect':40,230 'connect':203 'consist':122 'contact':244 'content':209 'contract':89 'convert':117 'could':222 'crypto-gated API' 'data':5,19,51,68,215 'decim':115 'descript':184 'detail':248 'document':79,167 'els':234 'endpoint':6,20,30,160,175 'entir':235 'exact':74,95 'exampl':186 'experi':242 'finance/web3':55 'flat':128 'gate':3,17 'header':152 'id':70 'infer':54 'infrastructur':57 'instant':143 'json-response' 'key':138 'land':171 'limit':141 'list':173 'live':101 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':174 'maxamountrequir':105 'metadata':224 'minim':169 'network':86 'nft':4,18,66,228 'nft-data' 'nft-relat':65 'no-api-key' 'page':172,197 'paramet':183 'part':34 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payload':76,187 'payment':80,151,157 'per':11,25,47,120 'platform':38,134 'post':162 'prepar':240 'price':129 'prompt':205 'proof':158 'prospect':236 'protocol':44 'provid':179,246 'rate':140 'relat':67 'request':12,26,121,163 'request/response':181 'resolv':199 'resourc':61,69 'respons':75 'return':165,216 'schema':182 'scheme':96 'serv':64 'settl':82 'simpli':146 'sinc':111 'site':126 'site-wid':125 'someth':233 'span':50 'specif':60,227 'summari':231 'though':72 'unit':110 'unknown':220 'usdc':14,28,88,112 'usdc-settlement' 'use':87,113 'util':58 'valid':155 'via':92 'wallet':204 'wide':127 'x':150 'x-payment':149 'x402':2,16,43,94,98,156 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"208f0efd-fa63-46d2-89e7-90fd8ab0dc66","listingId":"240960bf-372d-46b0-bff8-4f78a471ca47","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.434Z"}],"sources":[{"listingId":"240960bf-372d-46b0-bff8-4f78a471ca47","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.434Z","lastSeenAt":"2026-04-22T02:32:08.544Z"}],"details":{"listingId":"240960bf-372d-46b0-bff8-4f78a471ca47","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/12 \\\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 x402 challenge returns maxAmountRequired of 20000 base units for USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/12"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/12"},{"claim":"The /api, /pricing, and /README pages show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Fetching NFT data or metadata on demand without managing API keys","Integrating NFT information into agent workflows that support x402 payments","Programmatic access to NFT resources with micropayment settlement on Base"],"bestFor":["Agents or bots that already support x402 payment protocol","Developers wanting keyless, pay-as-you-go NFT data access","Low-volume or sporadic NFT data lookups where $0.02/call is economical"],"notFor":["High-volume NFT data pipelines where per-call costs add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.45Z"},"updatedAt":"2026-04-22T02:32:08.544Z"}}