{"id":"ba234e76-6029-4481-b524-10a644b7315e","shortId":"XY58Br","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 97 via a POST request, gated behind 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 (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request and settled in USDC on Base. This specific endpoint is part of an NFT-related route (`/api/v1/nfts/97/metadata`), though the exact schema of the returned metadata is not documented. The x402 challenge confirms the endpoint is live, accepts the \"exact\" payment scheme, and responds with application/json content.\n\nBecause there is no OpenAPI spec, no request/response schema documentation, and no examples of what the NFT metadata payload looks like, the actual utility of this endpoint is difficult to evaluate without making a paid call. The provider's landing page confirms the pricing model and general philosophy (no rate limits, no API keys, instant access), but detailed per-endpoint documentation is absent.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Only a single NFT token ID (97) is exposed at this path; unclear if other token IDs are available","No examples of the metadata payload returned by this endpoint","Provider pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/97/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/97/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 payment details, but there is no OpenAPI spec, no request body schema, no response schema, and no documentation for what the NFT metadata contains. This is effectively a stub listing with verified 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'/request':16,32 '0.02':15,31,57,73,126 '000':67 '20':66 '6':71 '97':43 'Base USDC API' 'NFT metadata API' 'NFT token info' 'absent':239 'accept':166 'access':231 'account':78 'actual':198 'ai/ml':116 'analyt':115 'api':75,112,228 'application/json':174 'attach':82 'base':5,21,62,68,134 'base-network' 'behind':49 'broader':105 'call':9,25,55,111,211 'caller':81 'catalog':106 'challeng':160 'confirm':161,217 'content':175 'cost':56 'data':114,119 'decim':72 'detail':233 'difficult':204 'document':157,185,237 'endpoint':3,19,34,137,163,202,236 'evalu':206 'exact':149,168 'exampl':188 'finance/web3':118 'gate':48 'general':222 'header':87 'host':103 'id':42 'infer':117 'instant':230 'json':96 'key':76,229 'land':215 'like':196 'limit':226 'live':165 'look':195 'lowpaymentfee NFT' 'lowpaymentfee.com':36,102 'make':208 'maxamountrequir':64 'metadata':2,18,39,97,154,193 'model':220 'need':80 'network':63 'nft':1,17,38,143,192 'nft-metadata' 'nft-relat':142 'no-api-key' 'openapi':180 'page':216 'paid':210 'part':139 'pay':7,23,109 'pay-per-cal':6,22,108 'pay-per-call' 'pay-per-request NFT' 'payload':194 'payment':52,86,92,169 'per':8,24,110,127,235 'per-endpoint':234 'philosophi':223 'post':46 'price':124,219 'proof':93 'protocol':53 'provid':101,213 'rate':225 'receiv':95 'relat':144 'request':47,128 'request/response':183 'respond':172 'return':99,153 'rout':145 'schema':150,184 'scheme':170 'serv':37 'servic':122 'settl':130 'span':113 'spec':181 'specif':136 'though':147 'token':41 'token metadata' 'unit':69 'usdc':13,29,59,132 'usdc-settlement' 'util':121,199 'valid':90 'via':10,26,44 'without':207 'x':85 'x-payment':84 'x402':11,27,51,91,159 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"24907026-2c38-448b-be0c-d83841eb383f","listingId":"ba234e76-6029-4481-b524-10a644b7315e","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/97/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":"2026-04-21T18:32:28.939Z"}],"sources":[{"listingId":"ba234e76-6029-4481-b524-10a644b7315e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/97/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.939Z","lastSeenAt":"2026-04-22T10:03:06.124Z"}],"details":{"listingId":"ba234e76-6029-4481-b524-10a644b7315e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/97/metadata \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/97/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/nfts/97/metadata"},{"claim":"Asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/97/metadata"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata for token ID 97 without needing an API key","Programmatic access to NFT metadata with micropayment settlement on Base","Agent-driven NFT data retrieval using x402 payment protocol"],"bestFor":["Agents or bots that need NFT metadata and can settle USDC on Base","Developers experimenting with x402 pay-per-call patterns","Low-friction, keyless access to NFT data"],"notFor":["Bulk retrieval of metadata across many NFT collections (only one token ID exposed here)","Users who need detailed documentation or response schema guarantees before calling","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.94Z"},"updatedAt":"2026-04-22T10:03:06.124Z"}}