{"id":"9adadb7f-1cd8-42fb-afa5-f97fee133799","shortId":"cY47FE","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 endpoint at lowpaymentfee.com serves NFT metadata for token ID 18 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.\n\nThe provider operates a broader platform offering dozens of pay-per-call APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint is part of an NFT-related collection (path: /api/v1/nfts/18/metadata). The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913) on Base, and pays out to address 0x1A2B…85F3 with a 300-second payment timeout.\n\nBecause the endpoint returns only metadata for a single NFT (token 18), its utility is narrow unless the provider exposes similar endpoints for other token IDs. No OpenAPI schema, request body schema, or example responses were found in the crawl, so the exact structure of the returned metadata is unknown. The platform advertises no rate limits and instant access.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","x402 NFT endpoint","Base USDC API","pay-per-request NFT","lowpaymentfee NFT","on-chain metadata"],"warnings":["No OpenAPI or request/response schema available — the structure of returned metadata is unknown.","Endpoint serves only token ID 18; unclear if other token IDs are available at similar paths.","No documentation pages rendered meaningful content (pricing, README, and /api pages only showed 'Connect wallet').","Provider platform lists many APIs but none have detailed docs in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/18/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/18/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no documented request/response format, and no example payloads. The endpoint serves metadata for a single NFT token ID with no broader documentation, making it essentially a stub 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'/request':16,32 '0.02':15,31,57,73,129 '000':67 '0x1a2b':165 '0x8335':156 '18':43,184 '20':66 '2913':157 '300':169 '6':71 '85f3':166 'Base USDC API' 'NFT metadata API' 'accept':153 'access':231 'account':78 'across':114 'address':164 'advertis':225 'ai/ml':119 'analyt':118 'api':75,113 'attach':82 'base':5,21,62,68,159 'bodi':203 'broader':104 'call':9,25,55,112 'caller':81 'categori':115 'challeng':147 'collect':142 'confirm':148 'contract':155 'cost':56 'crawl':212 'data':117 'decim':72 'dozen':107 'endpoint':3,19,34,134,150,175,194 'exact':215 'exampl':206 'expos':192 'finance/web3':121 'found':209 'gate':48 'header':87 'id':42,198 'includ':116 'infer':120 'infrastructur':123 'instant':230 'json':96 'json-response' 'key':76 'limit':228 'live':152 'lowpaymentfee NFT' 'lowpaymentfee.com':36 'maxamountrequir':64 'metadata':2,18,39,97,178,220 'narrow':188 'need':80 'network':63 'nft':1,17,38,140,182 'nft-metadata' 'nft-relat':139 'no-api-key' 'offer':106 'on-chain metadata' 'openapi':200 'oper':102 'part':136 'path':143 'pay':7,23,110,161 'pay-per-cal':6,22,109 'pay-per-call' 'pay-per-request NFT' 'payment':52,86,92,171 'per':8,24,111,130 'platform':105,224 'post':46 'price':126 'proof':93 'protocol':53 'provid':101,191 'rate':227 'receiv':95 'relat':141 'request':47,131,202 'respons':207 'return':99,176,219 'schema':201,204 'second':170 'serv':37 'similar':193 'singl':181 'specif':133 'structur':216 'timeout':172 'token':41,183,197 'token metadata' 'uniform':127 'unit':69 'unknown':222 'unless':189 'usdc':13,29,59,154 'usdc-base' 'util':124,186 'valid':90 'via':10,26,44 'x':85 'x-payment':84 'x402':11,27,51,91,146 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"b1b13abb-010e-4ae5-9437-8c602c153e09","listingId":"9adadb7f-1cd8-42fb-afa5-f97fee133799","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/18/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":"2026-04-21T18:32:27.663Z"}],"sources":[{"listingId":"9adadb7f-1cd8-42fb-afa5-f97fee133799","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/18/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.663Z","lastSeenAt":"2026-04-22T21:32:16.411Z"}],"details":{"listingId":"9adadb7f-1cd8-42fb-afa5-f97fee133799","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/18/metadata \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/nfts/18/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/nfts/18/metadata"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/18/metadata"}],"useCases":["Retrieving metadata for NFT token 18 from this provider's collection","Demonstrating x402 micropayment integration for API access","Building NFT display UIs that need on-demand metadata fetching"],"bestFor":["Agents or apps needing NFT metadata without managing API keys","Developers experimenting with x402 payment-gated endpoints","Low-volume, on-demand NFT metadata lookups"],"notFor":["Bulk retrieval of metadata across many NFT collections","General-purpose NFT indexing (only serves token 18 at this path)","Users who need free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.068Z"},"updatedAt":"2026-04-22T21:32:16.411Z"}}