{"id":"8db96e6b-6a55-46d8-bb07-b9db9a04af35","shortId":"vUHkeu","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/44` is part of the lowpaymentfee.com platform, which offers a broad catalog 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 44), though the exact response payload is not documented. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.\n\nPayment is handled via the x402 protocol: callers receive a 402 challenge with payment details, then submit an `X-PAYMENT` header containing a signed USDC transaction to the specified payTo address. The challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or upfront commitments are required — access is purely pay-per-call.\n\nThe platform lists many other endpoints (sentiment analysis, text summarization, embeddings, price feeds, geocoding, etc.) all at the same $0.02 price point. However, documentation is extremely sparse: there is no OpenAPI spec, no request/response schema documentation, and the crawled pages beyond the landing page only show a \"Connect wallet\" prompt. The actual data returned by `/api/v1/nfts/44` is unknown, making it difficult to assess the endpoint's real utility without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","no-rate-limit"],"categories":["web3","nft","data"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No API documentation or OpenAPI spec available","Response schema for /api/v1/nfts/44 is completely unknown","All non-landing crawled pages returned only 'Connect wallet' with no useful content","The specific data returned by this NFT endpoint is undocumented — callers must experiment to discover the payload"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/44","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what data the NFT endpoint actually returns, and no examples. The endpoint path suggests NFT data but the description is just 'Premium API Access' with no further 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'0.02':10,24,94,152,189 '000':143 '20':142 '402':114 '44':74 '6':148 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'access':163 'actual':221 'address':135 'advertis':138 'ai/ml':56 'analysi':177 'analyt':55 'api':52,154 'appear':65 'assess':232 'base':8,22,102,144 'base-network' 'beyond':210 'broad':42 'call':169 'caller':111 'catalog':43 'challeng':115,137 'commit':160 'connect':217 'contain':126 'crawl':208 'data':5,19,54,71,222 'decim':149 'detail':118 'difficult':230 'document':82,193,205 'embed':180 'endpoint':6,20,30,64,84,175,234 'equal':151 'etc':184 'exact':77 'experiment':239 'extrem':195 'feed':182 'finance/web3':58 'gate':3,17 'geocod':183 'handl':106 'header':125 'howev':192 'id':73 'infer':57 'infrastructur':60 'key':155 'land':212 'limit':157 'list':172 'lowpaymentfee' 'lowpaymentfee.com':37 'make':228 'mani':173 'maxamountrequir':140 'model':92 'network':103 'nft':4,18,69 'nft-data' 'nft-relat':68 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':200 'page':209,213 'part':34 'pay':9,23,49,167 'pay-per-cal':166 'pay-per-call NFT' 'pay-per-request':48 'payload':79 'payment':104,117,124 'payto':134 'per':11,25,50,95,168 'platform':38,87,171 'point':191 'price':91,181,190 'prompt':219 'protocol':47,110 'pure':165 'rate':156 'real':236 'receiv':112 'relat':70 'request':12,26,51,96 'request/response':203 'requir':162 'resourc':72 'respons':78 'return':223 'schema':204 'sentiment':176 'serv':67 'settl':97 'share':88 'show':215 'sign':128 'span':53 'spars':196 'spec':201 'specif':63 'specifi':133 'submit':120 'summar':179 'text':178 'though':75 'transact':130 'uniform':90 'unit':145 'unknown':227 'upfront':159 'usdc':14,28,99,129,147 'usdc-settlement' 'util':61,237 'via':107 'wallet':218 'without':238 'x':123 'x-payment':122 'x402':2,16,46,109 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':45","prices":[{"id":"36cfb233-acfb-46b1-8d65-2ca781818bf2","listingId":"8db96e6b-6a55-46d8-bb07-b9db9a04af35","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.993Z"}],"sources":[{"listingId":"8db96e6b-6a55-46d8-bb07-b9db9a04af35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.993Z","lastSeenAt":"2026-04-22T04:02:47.546Z"}],"details":{"listingId":"8db96e6b-6a55-46d8-bb07-b9db9a04af35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/44\n# Returns 402 with x402 challenge. Include X-PAYMENT header with signed USDC payment to proceed.","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/44"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/44"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token (ID 44)","Programmatic NFT data retrieval without API key registration","Agent-driven NFT lookups with automatic micropayment settlement"],"bestFor":["Developers wanting zero-signup, pay-per-call NFT data access","AI agents that can settle x402 payments autonomously on Base","Quick prototyping where API key management is undesirable"],"notFor":["Production use requiring documented, stable response schemas","Bulk NFT data retrieval where per-call pricing would be expensive","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.998Z"},"updatedAt":"2026-04-22T04:02:47.546Z"}}