{"id":"1a4fde5c-262b-4b6a-a2c7-38dbf166044e","shortId":"Z8B9nU","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at `/api/v1/nfts/25` 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 (item ID 25), 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 (HTTP 402) requesting payment of 20,000 base units of USDC (0x8335…2913) on the Base network. Since USDC uses 6 decimals, the actual cost is $0.02 per request — consistent with the site-wide flat pricing of $0.02/request advertised on the landing page. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin: there is no OpenAPI spec, no example request/response bodies, and the `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The NFT endpoint specifically is not listed on the landing page's catalog (which covers analytics, AI, finance, and utility endpoints), so its functionality and response schema are unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key"],"categories":["nft","web3"],"synonyms":["NFT API","NFT data endpoint","pay-per-call NFT","x402 NFT","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/nfts/25 endpoint is not listed in the site's own API catalog — its purpose and response format are unknown","All secondary pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No example request or response bodies are available anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/25","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/25","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 zero documentation on what the NFT endpoint actually returns. No OpenAPI spec, no example responses, and the endpoint isn't even listed in the site's own catalog. Pricing is clear ($0.02/request in USDC on Base), but the lack of any schema or description of the response payload makes this effectively a 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'/api/v1/nfts/25':40 '/pricing':197 '/readme':199 '/request':144 '0.02':10,28,131,143 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x8335':116 '20':110 '25':79 '2913':117 '300':165 '402':106 '6':125 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'access':93,179 'actual':128 'addit':211 'address':157 'advertis':145,170 'ai':229 'ai/ml':61 'analyt':60,228 'api':16,34,57,92,172 'appear':70 'bare':205 'base':8,26,112,120 'base-network' 'beyond':88 'bodi':193 'call':56 'catalog':225 'chain':155 'challeng':104 'collect':48 'connect':206 'consist':134 'content':212 'cost':129 'cover':227 'data':5,23,59,76 'decim':126 'document':87,181 'endpoint':6,24,38,96,215,233 'exact':82,161 'exampl':191 'extrem':183 'financ':230 'finance/web3':63 'flat':140 'function':236 'gate':3,21 'generic':90 'howev':180 'http':105 'id':78 'infer':62 'infrastructur':65 'instant':178 'item':77 'key':17,35,173 'label':94 'land':148,222 'limit':176 'list':219 'live':98 'lowpaymentfee' 'lowpaymentfee.com':45 'need':18,36 'network':121 'nft':4,22,74,214 'nft-data' 'nft-relat':73 'no-api-key' 'on-chain':153 'openapi':188 'page':149,200,223 'part':42 'pay':9,27,54 'pay-per-cal':53 'pay-per-call NFT' 'pay-per-request' 'payload':84 'payment':108,150 'per':11,29,55,132 'platform':46,169 'premium':91 'price':141 'prompt':208 'protocol':52 'rate':175 'relat':75 'request':12,30,107,133 'request/response':192 'resolv':202 'resourc':69 'respons':83,238 'return':100 'schema':239 'scheme':162 'second':166 'serv':72 'settl':152 'sinc':122 'site':138 'site-wid':137 'span':58 'spec':189 'specif':68,216 'thin':184 'though':80 'timeout':167 'unclear':241 'unit':113 'usdc':14,32,115,123 'usdc-settlement' 'use':124,159 'util':66,232 'valid':102 'wallet':207 'wide':139 'x402':2,20,51,103 'x402 NFT' 'x402-gated':1,19 'x402-payment' 'x402-protocol':50","prices":[{"id":"73f044fc-dfb6-4272-85b6-5cad2475d1cc","listingId":"1a4fde5c-262b-4b6a-a2c7-38dbf166044e","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.073Z"}],"sources":[{"listingId":"1a4fde5c-262b-4b6a-a2c7-38dbf166044e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.073Z","lastSeenAt":"2026-04-22T16:32:58.627Z"}],"details":{"listingId":"1a4fde5c-262b-4b6a-a2c7-38dbf166044e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/25 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","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 network","source_url":"https://lowpaymentfee.com/api/v1/nfts/25"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/25"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page catalogs analytics, AI, finance, and utility endpoints but does not list /api/v1/nfts/25","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token/item via a single paid call","Integrating on-chain micropayment-gated data into an AI agent workflow","Accessing NFT information without managing API keys or subscriptions"],"bestFor":["Developers wanting zero-signup, pay-per-use NFT data access","AI agents that can settle x402 payments autonomously on Base","Prototyping Web3 data integrations with minimal overhead"],"notFor":["Production workloads requiring documented schemas and SLAs","Bulk NFT data retrieval where per-call pricing is inefficient","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.336Z"},"updatedAt":"2026-04-22T16:32:58.627Z"}}