{"id":"d8141f7e-ce69-4fc8-b3b7-a0be4e242f4a","shortId":"nUYgPv","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 46 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 a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request. This specific endpoint (/api/v1/nfts/46/metadata) appears to be an NFT metadata service, though the exact schema of the returned metadata is not documented. The platform advertises no minimums, no commitments, and instant access.\n\nThe x402 challenge was successfully captured and the endpoint is live, returning a well-formed 402 response. However, there is no OpenAPI spec, no documented request/response schema, and no examples of what the NFT metadata payload looks like. The endpoint's actual utility and data quality cannot be verified from available materials.","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 network NFT","micropayment API","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint.","No example request or response payloads are documented; the actual NFT metadata structure is unknown.","The endpoint path is specific to token ID 46; it is unclear whether other token IDs are supported or how to discover them.","Most documentation pages on the site returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/46/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/46/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 with clear pricing. However, there is no OpenAPI spec, no request/response schema, no examples of the returned NFT metadata, and the crawled docs pages are mostly empty ('Connect wallet'). The actual data served is unverifiable, making this effectively a stub 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'/request':16,32 '0.02':15,31,78,135 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '20':72 '402':186 '46':41 '6':83 'Base network NFT' 'NFT info endpoint' 'NFT metadata API' 'accept':52 'access':93,169 'actual':212 'advertis':162 'ai/ml':125 'amount':70 'analyt':124 'api':86,121 'appear':142 'avail':221 'base':5,21,49,66,74 'base-network' 'broader':108 'call':9,25,120 'cannot':217 'captur':175 'challeng':101,172 'commit':166 'contract':63 'data':123,128,215 'decim':84 'document':159,195 'endpoint':3,19,34,103,140,178,210 'entir':96 'equival':76 'exact':151 'exampl':200 'finance/web3':127 'form':185 'gate':95 'howev':188 'id':40 'infer':126 'infrastructur':130 'instant':168 'json':57 'key':87 'like':208 'limit':90 'live':180 'look':207 'lowpaymentfee.com':111 'materi':222 'maximum':69 'metadata':2,18,37,147,156,205 'micropay':100 'micropayment API' 'minimum':164 'network':50 'nft':1,17,36,146,204 'nft-metadata' 'no-api-key' 'offer':113 'openapi':192 'part':105 'pay':7,23,118 'pay-per-cal':6,22,117 'pay-per-call' 'pay-per-request NFT' 'payload':206 'payment':45,58 'per':8,24,79,119,136 'platform':109,161 'post':53 'price':133 'protocol':46 'qualiti':216 'rate':89 'request':54,80,137 'request/response':196 'requir':92 'respons':187 'return':56,155,181 'schema':152,197 'serv':35 'servic':148 'settl':60 'span':122 'spec':193 'specif':139 'success':174 'though':149 'token':39 'token metadata' 'unit':75 'usdc':13,29,62,81 'usdc-settlement' 'use':82 'util':131,213 'varieti':115 'verifi':219 'via':10,26,42 'well':184 'well-form':183 'x402':11,27,44,99,171 'x402 NFT' 'x402-payment'","prices":[{"id":"cbc19f98-f46f-4aa9-85ab-95443aee28f7","listingId":"d8141f7e-ce69-4fc8-b3b7-a0be4e242f4a","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/46/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":"2026-04-21T18:32:31.402Z"}],"sources":[{"listingId":"d8141f7e-ce69-4fc8-b3b7-a0be4e242f4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/46/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.402Z","lastSeenAt":"2026-04-22T10:33:05.073Z"}],"details":{"listingId":"d8141f7e-ce69-4fc8-b3b7-a0be4e242f4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/46/metadata \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\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 a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base.","source_url":"https://lowpaymentfee.com/api/v1/nfts/46/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/nfts/46/metadata"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata for display in wallets or marketplaces","Agent-driven NFT data lookups without managing API keys","Programmatic access to NFT attributes for indexing or analytics"],"bestFor":["Agents needing keyless, pay-per-call NFT metadata access","Developers building on Base who want frictionless API billing","Quick one-off NFT metadata lookups without subscription overhead"],"notFor":["Bulk NFT metadata retrieval across thousands of tokens (no batch endpoint documented)","Use cases requiring detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.401Z"},"updatedAt":"2026-04-22T10:33:05.073Z"}}