{"id":"72fd5dac-cc3a-49e2-8748-1d28941bc162","shortId":"LttkVV","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/46` is part of the lowpaymentfee.com platform, which offers a 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 ID 46), though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a `maxAmountRequired` of 20,000 base units. USDC uses 6 decimals, so this translates to $0.02 per request — consistent with the platform's uniform $0.02/request pricing across all listed endpoints. No API keys are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse. The landing page lists endpoint paths and prices but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. The NFTs endpoint specifically (`/api/v1/nfts/46`) is not listed on the homepage's API catalog, making its purpose and output format unclear. Treat this as an experimental or lightly-documented service.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","402 payment API"],"warnings":["No request or response schema documented for this endpoint","The /api/v1/nfts/46 path is not listed in the provider's public API catalog — its purpose is unclear","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No examples, error codes, or rate limit details available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/46","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but documentation is essentially nonexistent. No request/response schema, no parameter descriptions, and the specific NFTs endpoint isn't even listed on the provider's homepage catalog. Pricing is clear but everything else must be 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'/api/v1/nfts/46':32,205 '/pricing':185 '/readme':187 '/request':127 '0.02':10,24,117,126 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20':105 '402 payment API' '46':73 '6':111 'Base USDC API' 'NFT API' 'NFT data endpoint' 'access':160 'across':129 'addit':199 'advertis':101,154 'ai/ml':55 'analyt':54 'api':51,134,213 'appear':64 'attach':140 'base':8,22,87,107 'base-network' 'caller':138 'catalog':214 'challeng':100 'connect':194 'consist':120 'content':200 'contract':91 'data':5,19,53,70 'decim':112 'descript':179 'document':81,161,230 'endpoint':6,20,30,63,132,169,203 'exact':76,96 'exampl':182 'experiment':226 'extrem':163 'finance/web3':57 'format':220 'gate':3,17 'header':145 'homepag':211 'id':72 'infer':56 'infrastructur':59 'instant':159 'key':135 'land':166 'light':229 'lightly-docu':228 'limit':157 'list':131,168,208 'lowpaymentfee' 'lowpaymentfee.com':37 'make':215 'maxamountrequir':103 'minim':193 'network':88 'nft':4,18,68 'nft-data' 'nft-relat':67 'nfts':202 'no-api-key' 'offer':40 'output':219 'page':167,188 'paramet':178 'part':34 'path':170 'pay':9,23,48 'pay-per-call NFT' 'pay-per-request':47 'payload':78 'payment':82,144,150 'per':11,25,49,118 'platform':38,123,153 'price':128,172 'prompt':196 'proof':151 'protocol':46 'provid':174 'purpos':217 'rate':156 'relat':69 'request':12,26,50,119 'request/response':176 'requir':137 'resolv':190 'resourc':71 'respons':77 'schema':177 'scheme':97 'serv':66 'servic':231 'settl':84 'simpli':139 'span':52 'spars':164 'specif':62,204 'suit':42 'though':74 'translat':115 'treat':222 'unclear':221 'uniform':125 'unit':108 'usag':181 'usdc':14,28,90,109 'usdc-settlement' 'use':89,110 'util':60 'valid':148 'via':93 'wallet':195 'x':143 'x-payment':142 'x402':2,16,45,95,99,149 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"9f5b7622-4e4b-483d-9b64-7e2a9e48446c","listingId":"72fd5dac-cc3a-49e2-8748-1d28941bc162","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.954Z"}],"sources":[{"listingId":"72fd5dac-cc3a-49e2-8748-1d28941bc162","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.954Z","lastSeenAt":"2026-04-22T04:02:47.503Z"}],"details":{"listingId":"72fd5dac-cc3a-49e2-8748-1d28941bc162","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/46 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and settlement on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/46"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/46"}],"useCases":["Fetching NFT metadata or details via a single paid request","Agent-driven NFT data retrieval without API key management","Programmatic access to NFT information settled on Base L2"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-use NFT data access","Low-volume or sporadic NFT data lookups at $0.02 each"],"notFor":["High-volume NFT indexing where per-call costs add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.06Z"},"updatedAt":"2026-04-22T04:02:47.503Z"}}