{"id":"e635e563-99e3-4f02-8caf-861645c59d39","shortId":"kdkG8E","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at `/api/v1/nfts/49` 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 `/api/v1/nfts/49` path is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label — it may return NFT-related data for token ID 49, but this is inferred from the URL pattern rather than confirmed by documentation.\n\nThe endpoint is live and responds with a standard x402 payment challenge. It accepts USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on the Base network using the \"exact\" payment scheme. The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing across all listed endpoints. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. There is no OpenAPI schema, no detailed documentation for individual endpoints, and no example request/response payloads available from the crawled pages. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content. Because the actual response payload and input parameters for this specific endpoint are undocumented, agents should treat this as a minimally documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","nft-data","json-response","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","premium API access","x402 NFT endpoint","Base USDC API","pay-per-call API","lowpaymentfee","NFT data endpoint"],"warnings":["No documentation exists for the /api/v1/nfts/49 endpoint — its actual functionality is unknown","No OpenAPI schema, input parameters, or response format documented","All secondary pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The endpoint label 'Premium API Access' is generic and does not describe what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/49","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/49","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, but there is no documentation for the /api/v1/nfts/49 path — no input schema, no response examples, and no description beyond the generic 'Premium API Access' label. The crawled pages provide no additional detail. This is effectively a stub 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'/api/v1/nfts/49':38,67 '/pricing':212 '/readme':214 '/request':17,34,160 '0.02':16,33,150,159 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':139 '300':174 '49':94 '6':147 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':121 'access':73,188 'across':162 'actual':229 'addit':225 'address':170 'advertis':179 'agent':241 'ai/ml':59 'amount':136 'analyt':58 'api':5,22,55,72,181 'avail':205 'base':8,25,127,141 'beyond':81 'call':12,29 'challeng':119 'collect':46 'confirm':105 'connect':220 'consist':153 'content':226 'contract':123 'crawl':208 'data':57,90 'decim':148 'detail':195 'document':80,107,196,248 'endpoint':6,23,36,109,165,199,238,249 'equal':149 'exact':76,131 'exampl':202 'finance/web3':61 'function':77 'gate':3,20 'id':93 'individu':198 'infer':60,98 'infrastructur':63 'input':233 'instant':187 'json-response' 'key':182 'label':70,83 'limit':185 'list':164 'live':111 'lowpaymentfee' 'lowpaymentfee.com':43 'maximum':135 'may':85 'minim':247 'network':128 'nft':88 'nft-data' 'nft-relat':87 'no-api-key' 'openapi':192 'page':209,215 'paramet':234 'part':40 'path':68 'pattern':102 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payload':204,231 'payment':118,132,166 'per':11,28,53,151 'platform':44,156,178 'premium':4,21,71 'premium API access' 'price':161 'prompt':222 'protocol':50 'rate':184 'rather':103 'relat':89 'request':54,152 'request/response':203 'requir':137 'respond':113 'respons':230 'return':86,217 'schema':193 'scheme':133 'second':175 'sent':168 'span':56 'specif':66,237 'standard':116 'timeout':176 'token':92 'treat':243 'undocu':240 'uniform':158 'unit':142 'url':101 'usdc':14,31,122,144 'usdc-base' 'use':129 'util':64 'wallet':221 'x402':2,19,49,117 'x402 NFT endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"2d877a10-94e1-40ea-91e5-5bfb37bd4329","listingId":"e635e563-99e3-4f02-8caf-861645c59d39","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.034Z"}],"sources":[{"listingId":"e635e563-99e3-4f02-8caf-861645c59d39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.034Z","lastSeenAt":"2026-04-22T04:02:47.590Z"}],"details":{"listingId":"e635e563-99e3-4f02-8caf-861645c59d39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/49 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/49"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/49"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or data for token ID 49 via a single paid request","Integrating pay-per-call NFT data into agent workflows without API key management","Testing x402 protocol payment flows against a low-cost live endpoint"],"bestFor":["Agents needing on-demand NFT data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Low-volume, pay-as-you-go API consumers on Base network"],"notFor":["High-volume NFT data needs where bulk pricing would be more economical","Users who need detailed API documentation or guaranteed response schemas before integrating","Non-crypto users who cannot pay with USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.875Z"},"updatedAt":"2026-04-22T04:02:47.590Z"}}