{"id":"5e60a3f6-d436-49fc-943d-f83e97f4915d","shortId":"dmB87g","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 12 via the x402 payment protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required; access is gated entirely by the x402 micropayment challenge.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. The specific endpoint probed here (/api/v1/nfts/12/metadata) is not listed on the site's landing page catalog, suggesting it may be an additional or unlisted route. The platform advertises no minimums, no commitments, and instant access.\n\nBecause there is no OpenAPI schema, no documentation beyond the landing page, and no example response for this NFT metadata endpoint, the actual structure and content of the returned metadata are unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC micropayment","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint.","This specific NFT metadata route (/api/v1/nfts/12/metadata) is not listed on the provider's landing page — it may be unlisted or experimental.","No example response is available; the structure of the returned NFT metadata is unknown.","The endpoint is scoped to a single token ID (12); generalizability to other token IDs is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/12/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/12/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 well-formed, confirming the endpoint works. However, there is no OpenAPI schema, no documentation for this specific NFT metadata route, no example responses, and the endpoint isn't even listed on the provider's own landing page. The actual response payload is entirely 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'/request':16,32 '0.02':15,31,78,134 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '12':41 '20':72 '6':83 'Base USDC micropayment' 'NFT info endpoint' 'NFT metadata API' 'accept':52 'access':93,171 'actual':194 'addit':158 'advertis':164 'ai/ml':124 'amount':70 'analyt':123 'api':86,120 'base':5,21,49,66,74 'base-network' 'beyond':180 'broader':108 'call':9,25,119 'catalog':152 'challeng':101,206 'commit':168 'confirm':213 'content':197 'contract':63 'data':122,127 'decim':84 'document':179 'dozen':114 'endpoint':3,19,34,103,139,192,215 'entir':96 'equival':76 'exampl':186 'finance/web3':126 'form':212 'gate':95 'id':40 'infer':125 'instant':170 'json':57 'key':87 'land':150,182 'limit':90 'list':145 'live':208 'lowpaymentfee.com':111 'maximum':69 'may':155 'metadata':2,18,37,191,201 'micropay':100 'minimum':166 'network':50 'nft':1,17,36,190 'nft-metadata' 'no-api-key' 'offer':113 'openapi':176 'oper':217 'page':151,183 'part':105 'pay':7,23,117 'pay-per-cal':6,22,116 'pay-per-call' 'pay-per-request NFT' 'payment':45,58 'per':8,24,79,118,135 'platform':109,163 'post':53 'price':132 'probe':140 'protocol':46 'rate':89 'request':54,80,136 'requir':92 'respons':187 'return':56,200 'rout':161 'schema':177 'serv':35 'servic':130 'settl':60 'site':148 'span':121 'specif':138 'structur':195 'suggest':153 'token':39 'token metadata' 'unit':75 'unknown':203 'unlist':160 'usdc':13,29,62,81 'usdc-settlement' 'use':82 'util':129 'via':10,26,42 'well':211 'well-form':210 'x402':11,27,44,99,205 'x402 NFT' 'x402-payment'","prices":[{"id":"4f254680-aa6c-42f6-a088-1f9c6c5c1cf5","listingId":"5e60a3f6-d436-49fc-943d-f83e97f4915d","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/12/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":"2026-04-21T18:32:27.641Z"}],"sources":[{"listingId":"5e60a3f6-d436-49fc-943d-f83e97f4915d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/12/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.641Z","lastSeenAt":"2026-04-22T21:32:16.385Z"}],"details":{"listingId":"5e60a3f6-d436-49fc-943d-f83e97f4915d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/12/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/nfts/12/metadata"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/12/metadata"}],"useCases":["Fetching on-chain NFT metadata for display in wallets or marketplaces","Agent-driven NFT data retrieval without API key management","Programmatic access to NFT attributes for indexing or analytics"],"bestFor":["Agents or apps that need NFT metadata with zero signup friction","Developers wanting pay-per-call access without subscriptions","Web3 projects on Base that already hold USDC"],"notFor":["Bulk NFT metadata retrieval across many token IDs (only token 12 is exposed at this URL)","Users who need detailed API documentation or response schema guarantees","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.07Z"},"updatedAt":"2026-04-22T21:32:16.385Z"}}