{"id":"0c38ce0b-c1c3-45ec-a17d-e9bb63b6203c","shortId":"VAxS7Y","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 55 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 price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access; payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThis specific endpoint (/api/v1/nfts/55/metadata) is not listed on the site's landing page among the featured API categories, so its exact response schema and the nature of the NFT it describes are unknown. The x402 challenge confirms it is live and accepts POST requests. The output MIME type is application/json.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","on-chain metadata","x402 NFT","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific NFT (token 55) metadata content is unknown — no sample response available","Endpoint is not listed among the site's featured APIs, so it may be experimental or unlisted","No information on what NFT collection or project token 55 belongs to"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/55/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/55/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing, network, and asset details. However, there is no OpenAPI schema, no documented request/response body, and the specific NFT metadata endpoint is not described on the landing page. The response format and contents must be 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'/request':16,32 '0.02':15,31,90,125 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':151 '20':80 '55':41 '6':86 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':193 'access':139 'advertis':130 'ai/ml':114 'among':165 'analyt':113 'api':110,132,168 'application/json':201 'base':5,21,52,82,149 'base-network' 'broader':99 'call':9,25,127 'caller':55 'categori':169 'chain':145 'challeng':187 'confirm':188 'contain':66 'contract':150 'data':112,117 'decim':87 'describ':182 'dozen':105 'endpoint':3,19,34,94,154 'equal':89 'exact':172 'featur':167 'finance/web3':116 'gate':109 'header':65 'id':40 'infer':115 'infrastructur':119 'instant':138 'json':73 'json-response' 'key':133 'land':163 'limit':136 'list':158 'live':191 'lowpaymentfee.com':102 'metadata':2,18,37,74 'mime':198 'natur':177 'network':53 'nft':1,17,36,180 'nft-metadata' 'offer':104 'on-chain':143 'on-chain metadata' 'output':197 'page':164 'part':96 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':64,69,140 'per':8,24,46,91,126 'platform':100,129 'post':58,194 'price':78,122 'proof':70 'protocol':49 'rate':135 'receiv':72 'request':47,59,92,195 'respons':173 'return':76 'schema':174 'send':56 'serv':35 'settl':142 'site':161 'span':111 'specif':153 'token':39 'token metadata' 'type':199 'uniform':123 'unit':83 'unknown':184 'usdc':13,29,68,85,147 'usdc-settlement' 'util':120 'via':10,26,42,146 'x':63 'x-payment':62 'x402':11,27,48,108,186 'x402 NFT' 'x402-gated':107 'x402-payment'","prices":[{"id":"0fe89bec-3ee2-4104-873d-764ab3f60627","listingId":"0c38ce0b-c1c3-45ec-a17d-e9bb63b6203c","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/55/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":"2026-04-21T18:32:32.929Z"}],"sources":[{"listingId":"0c38ce0b-c1c3-45ec-a17d-e9bb63b6203c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/55/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.929Z","lastSeenAt":"2026-04-22T04:02:47.483Z"}],"details":{"listingId":"0c38ce0b-c1c3-45ec-a17d-e9bb63b6203c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/55/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 endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/55/metadata"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/55/metadata"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching metadata for NFT token ID 55 programmatically","Integrating NFT display data into a dApp or marketplace","Agent-driven NFT data retrieval with automatic micropayment"],"bestFor":["Developers needing on-demand NFT metadata without API keys","AI agents that can settle x402 payments on Base","Applications requiring low-cost, keyless NFT data access"],"notFor":["Bulk retrieval of metadata for large NFT collections (single token ID only)","Users who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.163Z"},"updatedAt":"2026-04-22T04:02:47.483Z"}}