{"id":"3bee19c3-39ef-4345-81e8-7d0a52c4cd85","shortId":"nHNRnE","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/30` is part of the lowpaymentfee.com platform, which offers a broad suite 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 path suggests NFT ID 30), though the exact response payload is not documented beyond the generic \"Premium API Access\" label.\n\nThe endpoint is live and returns a valid x402 challenge. It accepts POST requests and settles payments on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism.\n\nDocumentation is minimal. The site's landing page lists many endpoints at a uniform $0.02 price point 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. Without an OpenAPI spec or detailed docs, the exact input parameters and response structure for this NFT endpoint remain unknown.","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","Base USDC API","lowpaymentfee","crypto-gated API","402 payment NFT"],"warnings":["No API documentation, OpenAPI spec, or response schema available","Exact request parameters and response structure are unknown","The site's /api, /pricing, and /README pages contain no useful content beyond 'Connect wallet'","The platform lists many endpoints but none appear individually documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/30","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/30","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 no OpenAPI spec, no request/response schema, no documentation beyond a generic label, and no example payloads. The actual functionality behind 'Premium API Access' for /api/v1/nfts/30 is entirely 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'/api/v1/nfts/30':32 '/pricing':188 '/readme':190 '0.02':10,24,134,169 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':123 '30':77 '402 payment NFT' '6':131 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':104 'access':91,148 'addit':202 'advertis':139 'ai/ml':56 'amount':120 'analyt':55 'api':52,90,141 'appear':65 'authent':153 'bare':196 'base':8,22,112,125 'base-network' 'beyond':86 'broad':42 'challeng':102 'connect':197 'content':203 'contract':116 'crypto-gated API' 'data':5,19,54,71 'decim':132 'descript':178 'detail':209 'doc':210 'document':85,155 'endpoint':6,20,30,64,94,165,221 'equal':133 'exact':80,212 'exampl':180 'finance/web3':58 'gate':3,17 'generic':88 'id':76 'infer':57 'infrastructur':60 'input':213 'instant':147 'key':142 'label':92 'land':161 'limit':145 'list':163 'live':96 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':164 'maximum':119 'mechan':154 'minim':157 'network':113 'nft':4,18,69,75,220 'nft-data' 'nft-relat':68 'no-api-key' 'offer':40 'openapi':206 'page':162,191 'paramet':177,214 'part':34 'path':73 'pay':9,23,49 'pay-per-call NFT' 'pay-per-request':48 'payload':82,181 'payment':109,149 'per':11,25,50,135 'platform':38,138 'point':171 'post':105 'post-method' 'premium':89 'price':170 'prompt':199 'protocol':47 'provid':173 'rate':144 'relat':70 'remain':222 'request':12,26,51,106,136 'request/response':175 'requir':121 'resolv':193 'resourc':72 'respons':81,216 'return':98 'schema':176 'serv':67 'settl':108 'site':159 'span':53 'spec':207 'specif':63 'structur':217 'suggest':74 'suit':43 'though':78 'uniform':168 'unit':126 'unknown':223 'usdc':14,28,115,128 'usdc-settlement' 'use':114 'util':61 'valid':100 'wallet':198 'without':204 'x402':2,16,46,101 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':45","prices":[{"id":"d87594b0-54a2-4d6f-b1ab-85eb56817def","listingId":"3bee19c3-39ef-4345-81e8-7d0a52c4cd85","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.897Z"}],"sources":[{"listingId":"3bee19c3-39ef-4345-81e8-7d0a52c4cd85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.897Z","lastSeenAt":"2026-04-22T18:33:27.346Z"}],"details":{"listingId":"3bee19c3-39ef-4345-81e8-7d0a52c4cd85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/30 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/30"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/30"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching on-chain or off-chain NFT metadata by ID","Integrating NFT data into agent workflows without managing API keys","Programmatic NFT lookups with micropayment settlement on Base"],"bestFor":["Agents or bots that need keyless, pay-per-call NFT data access","Developers experimenting with x402 payment protocol integrations","Low-volume NFT data consumers who prefer usage-based pricing"],"notFor":["High-volume NFT analytics requiring bulk/batch endpoints","Users who need detailed API documentation and guaranteed SLAs","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.7Z"},"updatedAt":"2026-04-22T18:33:27.346Z"}}