{"id":"5f9acb51-d1e8-4891-ba53-9c2522dbadaf","shortId":"Kw9A7t","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/73` 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 (resource ID 73), though the exact response payload is not documented beyond the generic \"Premium API Access\" label. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 exact-payment scheme.\n\nThe x402 challenge is live and well-formed. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site-wide flat pricing advertised on the landing page. No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts POST requests.\n\nDocumentation is minimal. The landing page lists many endpoints across categories but provides no request/response schemas, example payloads, or detailed descriptions for any individual endpoint, including this one. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. Without an OpenAPI spec or example responses, the exact data returned by `/api/v1/nfts/73` cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","post-method"],"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","Response payload structure is entirely unknown — 'Premium API Access' is the only description","The /api, /pricing, and /README pages contain no useful content (just 'Connect wallet')","The specific NFT resource (ID 73) purpose is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/73","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/73","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/request in USDC on Base), but there is no OpenAPI spec, no request/response schema, no example payloads, and no documentation beyond a generic label. The actual data returned by this NFT endpoint is 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'/api/v1/nfts/73':32,230 '/pricing':202 '/readme':204 '0.02':10,24,129 '000':120 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '20':119 '6':125 '73':71 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'accept':169 'access':85 'across':181 'addit':216 'advertis':140 'ai/ml':53 'amount':116 'analyt':52 'api':49,84,146 'appear':62 'attach':155 'bare':210 'base':8,22,92,121 'base-network' 'beyond':80 'caller':153 'cannot':231 'categori':182 'challeng':107 'collect':40 'confirm':233 'connect':211 'consist':132 'content':217 'contract':96 'data':5,19,51,68,227 'decim':126 'descript':192 'detail':191 'document':79,172 'endpoint':6,20,30,168,180,196 'equal':128 'exact':74,102,226 'exact-pay':101 'exampl':188,223 'finance/web3':55 'flat':138 'form':113 'gate':3,17 'generic':82 'header':160 'id':70 'includ':197 'individu':195 'infer':54 'infrastructur':57 'key':147 'label':86 'land':143,176 'limit':150 'list':178 'live':109 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':179 'maximum':115 'minim':174 'network':93 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'one':199 'openapi':220 'page':144,177,205 'part':34 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payload':76,189 'payment':87,103,159,165 'per':11,25,47,130 'platform':38 'post':170 'post-method' 'premium':83 'price':139 'prompt':213 'proof':166 'protocol':44 'provid':184 'rate':149 'relat':67 'request':12,26,48,131,171 'request/response':186 'requir':117,152 'resolv':207 'resourc':61,69 'respons':75,224 'return':228 'schema':187 'scheme':104 'serv':64 'settl':89 'simpli':154 'site':136 'site-wid':135 'span':50 'spec':221 'specif':60 'though':72 'unit':122 'usdc':14,28,95,124 'usdc-settlement' 'use':94 'util':58 'valid':163 'via':98 'wallet':212 'well':112 'well-form':111 'wide':137 'without':218 'x':158 'x-payment':157 'x402':2,16,43,100,106,164 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"a8994374-899c-4147-b693-55a29e54fbb3","listingId":"5f9acb51-d1e8-4891-ba53-9c2522dbadaf","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.632Z"}],"sources":[{"listingId":"5f9acb51-d1e8-4891-ba53-9c2522dbadaf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.632Z","lastSeenAt":"2026-04-22T13:32:33.892Z"}],"details":{"listingId":"5f9acb51-d1e8-4891-ba53-9c2522dbadaf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/73 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/73"},{"claim":"Site-wide flat pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/73"}],"useCases":["Fetching NFT metadata or details for a specific token/collection","Integrating on-demand NFT data into agent workflows without API key management","Paying per-request for NFT information using USDC on Base"],"bestFor":["Agents that need keyless, pay-per-call access to NFT data","Developers experimenting with x402 protocol integrations","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["High-volume NFT data consumers who need bulk/batch endpoints","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.419Z"},"updatedAt":"2026-04-22T13:32:33.892Z"}}