{"id":"59b249d3-53a3-40c0-a523-fd55fee68c39","shortId":"UA2wMB","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/38` is part of the lowpaymentfee.com platform, which offers 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 38), 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 advertises a `maxAmountRequired` of 20,000 base units. USDC uses 6 decimals, so this translates to $0.02 per request — consistent with the site-wide flat pricing of $0.02/request shown on the landing page. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is gated purely by the x402 payment header. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a max timeout of 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists many endpoints across categories but provides no request/response schemas, parameter descriptions, or example payloads for any of them — including this NFT endpoint. The `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no additional content. Without documentation of what data this endpoint returns or what parameters it accepts, usage requires experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","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 request or response schema documented for this endpoint","No examples or parameter descriptions available anywhere on the site","The specific data returned by /api/v1/nfts/38 is unknown — the endpoint name suggests NFT data but this is inferred","All documentation pages (/api, /pricing, /README) render only a 'Connect wallet' prompt with no content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/38","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/38","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 zero documentation on request parameters, response schema, or what NFT data is actually returned. The /api, /pricing, and /README pages are empty. This is effectively a stub 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'/api/v1/nfts/38':32 '/pricing':205 '/readme':207 '/request':130 '0.02':10,24,117,129 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20':105 '300':171 '38':73 '6':111 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':138,232 'access':152 'across':183 'addit':218 'address':163 'advertis':101,151 'ai/ml':55 'analyt':54 'api':51,145 'appear':64 'application/json':143 'base':8,22,87,107 'base-network' 'categori':184 'challeng':100 'collect':42 'connect':213 'consist':120 'content':219 'contract':91 'crypto-gated API' 'data':5,19,53,70,224 'decim':112 'descript':191 'document':81,173,221 'endpoint':6,20,30,63,137,182,202,226 'exact':76,96 'exampl':193 'experiment':235 'extrem':175 'finance/web3':57 'flat':126 'gate':3,17,154 'header':160 'id':72 'includ':199 'infer':56 'infrastructur':59 'json-response' 'key':146 'land':134,178 'limit':149 'list':180 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':181 'max':168 'maxamountrequir':103 'network':88 'nft':4,18,68,201 'nft-data' 'nft-relat':67 'no-api-key' 'offer':40 'page':135,179,208 'paramet':190,230 'part':34 'pay':9,23,48 'pay-per-call NFT' 'pay-per-request':47 'payload':78,194 'payment':82,159,162 'per':11,25,49,118 'platform':38 'post':139 'price':127 'prompt':215 'protocol':46 'provid':186 'pure':155 'rate':148 'relat':69 'render':210 'request':12,26,50,119,140 'request/response':188 'requir':234 'resourc':71 'respons':77 'return':142,227 'schema':189 'scheme':97 'second':172 'serv':66 'settl':84 'shown':131 'site':124 'site-wid':123 'span':52 'spars':176 'specif':62 'though':74 'timeout':169 'translat':115 'unit':108 'usag':233 'usdc':14,28,90,109 'usdc-settlement' 'use':89,110 'util':60 'via':93 'wallet':214 'wide':125 'without':220 'x402':2,16,45,95,99,158 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"1728d588-c79b-4ad5-811b-7b9f7abf614c","listingId":"59b249d3-53a3-40c0-a523-fd55fee68c39","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.656Z"}],"sources":[{"listingId":"59b249d3-53a3-40c0-a523-fd55fee68c39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.656Z","lastSeenAt":"2026-04-22T10:03:09.409Z"}],"details":{"listingId":"59b249d3-53a3-40c0-a523-fd55fee68c39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Site-wide 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":"x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/nfts/38"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/38"}],"useCases":["Fetching NFT metadata or details for a specific token/collection","Integrating NFT data into agent workflows without API key management","Programmatic pay-per-request access to NFT information on Base"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Quick one-off NFT data lookups without subscription overhead","Developers experimenting with x402 protocol integrations"],"notFor":["High-volume NFT data needs where per-request pricing adds up","Users who need detailed API documentation before integrating","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.083Z"},"updatedAt":"2026-04-22T10:03:09.409Z"}}