{"id":"ce79d3f2-4be6-4c4f-94a4-da294d0ea814","shortId":"YHZpwP","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 serves NFT metadata for token ID 78 via a pay-per-request x402 protocol on the Base network. The caller sends a POST request with an X-PAYMENT header containing a USDC payment proof, and receives JSON metadata in return. The payment is settled on-chain using USDC (contract 0x8335…2913) on Base.\n\nThe endpoint is part of a broader API platform at lowpaymentfee.com that offers dozens of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; authentication and billing are handled entirely through the x402 payment challenge. The x402 challenge specifies a maxAmountRequired of 20000 base units; since USDC uses 6 decimals, this equals $0.02 per call.\n\nThis specific endpoint (/api/v1/nfts/78/metadata) is not prominently listed on the site's landing page, which focuses on analytics, AI, finance, and utility endpoints. The actual content of the NFT metadata returned is unknown — no example response or schema is documented. The endpoint is confirmed live (returns 402 with a valid x402 challenge).","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","on-chain metadata","Base USDC API","x402 NFT","pay-per-call NFT"],"warnings":["No response schema or example response documented — the content of the NFT metadata is unknown.","This specific endpoint (/api/v1/nfts/78/metadata) is not listed on the provider's landing page; it may be a test or unlisted resource.","No OpenAPI spec or detailed documentation available for any endpoint on this platform.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/78/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/78/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no documented request body, no example response, and the NFT metadata endpoint isn't even listed on the provider's landing page. The actual data returned is entirely 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'/request':16,32 '0.02':15,31,119,162 '0x8335':87 '20000':152 '2913':88 '402':211 '6':158 '78':41 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'access':133 'across':107 'actual':189 'advertis':124 'ai':183 'ai/ml':110 'analyt':109,182 'api':98,126 'authent':134 'base':5,21,52,90,153 'base-network' 'bill':136 'broader':97 'call':9,25,164 'caller':55 'chain':83 'challeng':144,147,216 'confirm':208 'contain':66 'content':190 'contract':86 'data':108 'decim':159 'document':204 'dozen':104 'endpoint':3,19,34,92,106,167,187,206 'entir':139 'equal':161 'exampl':199 'financ':184 'finance/web3':112 'focus':180 'handl':138 'header':65 'id':40 'infer':111 'infrastructur':114 'instant':132 'json':73 'json-response' 'key':127 'land':177 'limit':130 'list':172 'live':209 'lowpaymentfee.com':101 'maxamountrequir':150 'metadata':2,18,37,74,194 'network':53 'nft':1,17,36,193 'nft-metadata' 'offer':103 'on-chain':81 'on-chain metadata' 'page':178 'part':94 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':64,69,78,143 'per':8,24,46,120,163 'platform':99,123 'post':58 'price':117 'promin':171 'proof':70 'protocol':49 'rate':129 'receiv':72 'request':47,59,121 'respons':200 'return':76,195,210 'schema':202 'send':56 'serv':35 'settl':80 'sinc':155 'site':175 'specif':166 'specifi':148 'token':39 'token metadata' 'unit':154 'unknown':197 'usdc':13,29,68,85,156 'usdc-settlement' 'use':84,157 'util':115,186 'valid':214 'via':10,26,42 'x':63 'x-payment':62 'x402':11,27,48,142,146,215 'x402 NFT' 'x402-payment'","prices":[{"id":"b6f4d5e3-7607-4c97-8ca6-be7c41339c44","listingId":"ce79d3f2-4be6-4c4f-94a4-da294d0ea814","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/78/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":"2026-04-21T18:32:28.639Z"}],"sources":[{"listingId":"ce79d3f2-4be6-4c4f-94a4-da294d0ea814","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/78/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.639Z","lastSeenAt":"2026-04-22T13:32:33.926Z"}],"details":{"listingId":"ce79d3f2-4be6-4c4f-94a4-da294d0ea814","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/78/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":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/78/metadata"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/78/metadata"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists analytics, AI, finance, and utility endpoints but not this NFT metadata endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for NFT token #78 programmatically","Integrating NFT metadata into a dApp or marketplace without API keys","Agent-driven NFT data retrieval with micropayments"],"bestFor":["Developers needing NFT metadata without managing API keys","Agents that can settle USDC payments on Base via x402","Low-volume, on-demand NFT metadata lookups"],"notFor":["Bulk NFT metadata retrieval across many token IDs (only token 78 is exposed at this path)","Users who cannot transact in USDC on Base network","Applications requiring detailed schema documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.404Z"},"updatedAt":"2026-04-22T13:32:33.926Z"}}