{"id":"cf5a9aa0-5af8-4cf4-a3c0-bcfe9dcd7be3","shortId":"89vNMV","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/14` 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 resource appears to serve NFT-related data (inferred from the URL path `/nfts/14`), though the provider's landing page does not explicitly list this particular endpoint among its advertised APIs. The endpoint is live and returns a valid x402 challenge.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) via the \"exact\" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request. No API keys are required; callers authenticate purely through the x402 payment header. The provider advertises no rate limits and instant access.\n\nThe platform hosts a broad set of endpoints at similar price points ($0.02 each), including sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. However, no OpenAPI schema, detailed documentation, or example responses were found for any endpoint, including this one. The actual data returned by `/api/v1/nfts/14` is unknown — it could be metadata for a specific NFT, a collection summary, or something else entirely. Callers should be prepared for an undocumented JSON response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT metadata","x402 NFT endpoint","pay-per-call NFT","Base USDC API","lowpaymentfee NFT","402 payment NFT"],"warnings":["The /api/v1/nfts/14 endpoint is not listed among the provider's advertised APIs on the landing page","No documentation, OpenAPI spec, or example responses are available for this endpoint","The actual response schema and data content are completely unknown","The /pricing, /api, and /README pages returned no useful content (only 'Connect wallet')"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/14","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/14","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, no OpenAPI schema, no example responses, and the specific endpoint (/api/v1/nfts/14) is not even listed on the provider's landing page. The actual functionality is entirely inferred from the URL 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'/nfts/14':74 '0.02':10,24,130,167 '000':122 '0x8335':112 '20':121 '2913':113 '402 payment NFT' '6':127 'Base USDC API' 'NFT API' 'NFT metadata' 'access':154 'actual':200 'advertis':90,148 'ai/ml':53 'among':88 'analysi':171 'analyt':52 'api':49,91,134 'appear':62 'authent':139 'base':8,22,107,123 'base-network' 'broad':159 'caller':138,222 'challeng':101 'collect':40,216 'contract':111 'could':208 'data':5,19,51,68,201 'decim':128 'detail':186 'document':187 'els':220 'embed':174 'endpoint':6,20,30,87,93,162,195 'entir':221 'equal':129 'estim':178 'exact':116 'exampl':189 'explicit':83 'feed':176 'finance/web3':55 'found':192 'gas':177 'gate':3,17 'geocod':179 'header':145 'host':157 'howev':182 'includ':169,196 'infer':54,69 'infrastructur':57 'instant':153 'json':229 'key':135 'land':79 'limit':151 'list':84 'live':95 'lowpaymentfee NFT' 'lowpaymentfee.com':37 'maxamountrequir':119 'metadata':210 'network':108 'nft':4,18,66,214 'nft-data' 'nft-relat':65 'no-api-key' 'one':198 'openapi':184 'page':80 'part':34 'particular':86 'path':73 'pay':9,23,46 'pay-per-call NFT' 'pay-per-request':45 'payment':102,144 'per':11,25,47,131 'platform':38,156 'point':166 'prepar':225 'price':165,175 'protocol':44 'provid':77,147 'pure':140 'rate':150 'relat':67 'request':12,26,48,132 'requir':137 'resourc':61 'respons':190,230 'return':97,202 'schema':185 'scheme':117 'sentiment':170 'serv':64 'set':160 'settl':104 'similar':164 'someth':219 'span':50 'specif':60,213 'summar':173 'summari':217 'text':172 'though':75 'undocu':228 'unit':124 'unknown':206 'url':72 'usdc':14,28,110 'usdc-settlement' 'use':109 'util':58 'valid':99 'via':114 'x402':2,16,43,100,143 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"2efcd3ec-1606-4ccf-a75f-bc050615fc5a","listingId":"cf5a9aa0-5af8-4cf4-a3c0-bcfe9dcd7be3","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.290Z"}],"sources":[{"listingId":"cf5a9aa0-5af8-4cf4-a3c0-bcfe9dcd7be3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.290Z","lastSeenAt":"2026-04-22T23:02:48.958Z"}],"details":{"listingId":"cf5a9aa0-5af8-4cf4-a3c0-bcfe9dcd7be3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/14 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/14"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/14"}],"useCases":["Fetching NFT data or metadata on demand with micropayments","Agent-driven NFT lookups without pre-provisioned API keys","Integrating NFT information into automated Web3 workflows"],"bestFor":["Agents needing keyless, pay-per-request NFT data access","Developers prototyping NFT integrations without subscription commitments","Low-volume or sporadic NFT data queries at $0.02 per call"],"notFor":["High-volume NFT indexing where per-call costs add up quickly","Use cases requiring well-documented response schemas or SLAs","Users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.705Z"},"updatedAt":"2026-04-22T23:02:48.958Z"}}