{"id":"d6d08070-f1e2-4e2a-acd7-ec05ff6fdaf6","shortId":"R9ZWMj","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com returns NFT metadata for token ID 49 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The price per call is $0.02 (maxAmountRequired of 20,000 base units at 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing covers only the NFT metadata endpoint at `/api/v1/nfts/49/metadata`.\n\nNo OpenAPI schema, detailed documentation, or example responses were found during the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual structure of the metadata response is unknown. Callers should expect a JSON response (mimeType: application/json) after submitting a valid X-PAYMENT header with a USDC payment on Base.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response structure for NFT metadata is completely undocumented","Only token ID 49 is referenced; unclear if other token IDs are supported at this path","The broader platform lists many API categories but crawled pages beyond the homepage returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/49/metadata","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/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge, but there is no OpenAPI schema, no documentation of request/response structure, and no example payloads. The NFT metadata content and format are entirely unknown. The listing is effectively a stub with only pricing and liveness 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'/request':16,32 '0.02':15,31,75,117 '000':79 '0x8335':61 '20':78 '2913':62 '402':164 '49':46 '6':83 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'actual':169 'ai/ml':107 'analyt':106 'api':103,122 'application/json':184 'base':5,21,56,80,198 'base-network' 'broader':91 'call':9,25,73 'caller':177 'challeng':166 'commit':130 'confirm':159 'contract':60 'cover':135 'crawl':155 'data':105,110 'decim':84 'detail':146 'document':147 'enabl':36 'endpoint':3,19,37,86,140,157 'exact':67 'exact-pay':66 'exampl':149 'expect':179 'finance/web3':109 'found':152 'header':192 'howev':131 'id':45 'infer':108 'json':181 'key':123 'limit':126 'list':134 'live':160 'lowpaymentfee.com':39,93 'maxamountrequir':76 'metadata':2,18,42,139,173 'mimetyp':183 'minimum':129 'network':57 'nft':1,17,41,138 'nft-metadata' 'no-api-key' 'offer':95 'openapi':144 'part':88 'pay':7,23,100 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':99 'payment':51,68,191,196 'per':8,24,72,101,118 'platform':92 'post':49 'price':71,115 'proper':163 'rate':125 'request':50,102,119 'respons':150,174,182 'return':40,161 'schema':145 'scheme':69 'servic':113 'settl':53 'span':104 'specif':133 'structur':170 'submit':186 'token':44 'token metadata' 'unit':81 'unknown':176 'usdc':13,29,59,195 'usdc-settlement' 'use':58 'util':112 'valid':188 'varieti':97 'via':10,26,47 'x':190 'x-payment':189 'x402':11,27,35,65,165 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"866e5625-87ae-4ea6-9150-c5478f001507","listingId":"d6d08070-f1e2-4e2a-acd7-ec05ff6fdaf6","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/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.162Z"}],"sources":[{"listingId":"d6d08070-f1e2-4e2a-acd7-ec05ff6fdaf6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/49/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.162Z","lastSeenAt":"2026-04-22T16:32:58.731Z"}],"details":{"listingId":"d6d08070-f1e2-4e2a-acd7-ec05ff6fdaf6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/49/metadata \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/49/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/49/metadata"},{"claim":"Payment settles on Base network using USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/49/metadata"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata for display in wallets or marketplaces","Agent-driven NFT data lookups without pre-registration or API keys","Programmatic access to NFT attributes for indexing or analytics"],"bestFor":["AI agents needing NFT metadata without credential setup","Developers wanting instant pay-per-call NFT data on Base","Low-volume or sporadic NFT metadata lookups at $0.02 each"],"notFor":["Bulk NFT metadata retrieval across thousands of tokens (no batch endpoint documented)","Free or open NFT metadata needs (every call costs $0.02)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.184Z"},"updatedAt":"2026-04-22T16:32:58.731Z"}}