{"id":"16fae2f4-f394-4992-b246-ccfc67a3ae8d","shortId":"pPjYWc","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/69` 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 (inferred from the URL path `/nfts/69`), though the provider's landing page labels it generically as \"Premium API Access\" and does not document the NFT endpoints separately from the broader catalog.\n\nPayment is handled via the x402 protocol on the Base network. The challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (contract `0x8335…2913`, 6 decimals), which equals **$0.02 per request**. This matches the uniform $0.02/request pricing shown across all endpoints on the site. Settlement is to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second payment timeout. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nDocumentation is minimal. The landing page lists many endpoints 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/69` — whether it's metadata for a specific NFT, a collection listing, or something else — cannot be confirmed from available materials.","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","crypto API","402 payment API"],"warnings":["No API documentation available — /api, /pricing, and /README all return only a 'Connect wallet' prompt","The exact data returned by /api/v1/nfts/69 is unknown; 'Premium API Access' is a generic label applied to all endpoints","No OpenAPI spec, no request parameters, and no response schema are published","The NFT endpoints are not listed on the provider's landing page, which only shows analytics, AI, finance, and utility APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/69","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and the actual functionality of /api/v1/nfts/69 is only inferable from the URL path. Effectively a stub 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'/api/v1/nfts/69':32,224 '/nfts/69':74 '/pricing':200 '/readme':202 '/request':138 '0.02':10,24,130,137 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':124 '20':117 '2913':125 '300':154 '402 payment API' '6':126 'Base USDC API' 'NFT API' 'NFT metadata' 'access':87,166 'across':141 'actual':220 'addit':214 'address':150 'advertis':113,165 'ai/ml':53 'analyt':52 'api':49,86,159 'appear':62 'avail':243 'bare':208 'base':8,22,109,119 'base-network' 'broader':98 'call':48 'cannot':239 'catalog':99 'challeng':112 'collect':40,234 'confirm':241 'connect':209 'content':215 'contract':123 'crypto API' 'data':5,19,51,68,221 'decim':127 'descript':190 'document':91,175 'els':238 'endpoint':6,20,30,94,143,183 'equal':129 'exampl':192 'finance/web3':55 'gate':3,17,168 'generic':83 'handl':102 'header':174 'infer':54,69 'infrastructur':57 'json-response' 'key':160 'label':81 'land':79,179 'limit':163 'list':181,235 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':182 'match':134 'materi':244 'maxamountrequir':115 'metadata':228 'minim':177 'network':110 'nft':4,18,66,93,232 'nft-data' 'nft-relat':65 'no-api-key' 'page':80,180,203 'paramet':189 'part':34 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payload':193 'payment':100,156,173 'per':11,25,47,131 'platform':38 'premium':85 'price':139 'prompt':211 'protocol':44,106 'provid':77,185 'pure':169 'rate':162 'relat':67 'request':12,26,132 'request/response':187 'resolv':205 'resourc':61 'return':222 'schema':188 'second':155 'separ':95 'serv':64 'settlement':147 'shown':140 'site':146 'someth':237 'span':50 'specif':60,231 'though':75 'timeout':157 'uniform':136 'unit':120 'url':72 'usdc':14,28,122 'usdc-settlement' 'util':58 'via':103 'wallet':210 'whether':225 'x402':2,16,43,105,172 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"61d201e0-1358-4965-a297-8e1a298af02f","listingId":"16fae2f4-f394-4992-b246-ccfc67a3ae8d","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.586Z"}],"sources":[{"listingId":"16fae2f4-f394-4992-b246-ccfc67a3ae8d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.586Z","lastSeenAt":"2026-04-22T02:32:09.973Z"}],"details":{"listingId":"16fae2f4-f394-4992-b246-ccfc67a3ae8d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/69 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/nfts/69"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/69"}],"useCases":["Fetching NFT data or metadata on demand without managing API keys","Agent-driven NFT lookups with automatic micropayment settlement","Integrating NFT information into Web3 dashboards or bots"],"bestFor":["Developers wanting zero-signup, pay-per-call NFT data access","AI agents that can settle x402 payments on Base","Prototyping NFT-related features without committing to a subscription"],"notFor":["High-volume NFT indexing where per-call costs add up quickly","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":"2026-02-17T23:12:57.48Z"},"updatedAt":"2026-04-22T02:32:09.973Z"}}