{"id":"683ba9e4-d955-4fe3-bd43-1f91f5b9ca85","shortId":"8zFLmU","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 x402-enabled endpoint serves NFT metadata for token ID 52 at `https://lowpaymentfee.com/api/v1/nfts/52/metadata`. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 \"exact\" scheme.\n\nThe maximum amount required per call is 20,000 base units of USDC. Since USDC uses 6 decimals, this equals $0.02 per request — consistent with the provider's site-wide pricing of $0.02/request across all their API endpoints. No API keys are needed; callers authenticate purely through the x402 payment header. The provider advertises no rate limits and instant access.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers APIs across several categories: data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share the same $0.02 per-request pricing and x402 payment model on Base. However, this specific listing covers only the NFT metadata endpoint (`/api/v1/nfts/52/metadata`). The exact schema of the returned metadata (e.g., name, image, attributes) is not documented in the available materials.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT attributes","on-chain metadata","x402 NFT endpoint","Base USDC API","pay-per-request NFT"],"warnings":["No response schema or example response is documented — the structure of the returned NFT metadata is unknown.","Only token ID 52 is exposed at this specific URL; it is unclear whether other token IDs are available at sibling paths.","Provider documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The platform lists many API categories (AI, finance, analytics, etc.) but none were probed; their actual functionality is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/52/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/52/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 (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented response format, no example responses, and the crawled docs pages are mostly empty ('Connect wallet'). The specific NFT metadata content and structure are 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'/request':16,32,106 '0.02':15,31,92,105,168 '000':80 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':66 '20':79 '52':44 '6':88 'Base USDC API' 'NFT attributes' 'NFT metadata API' 'accept':50 'access':133 'across':107,147 'advertis':127 'ai':152 'amount':74 'analyt':151 'api':110,113,146 'attribut':200 'authent':118 'avail':206 'base':5,21,61,81,178 'base-network' 'broader':140 'call':9,25,77 'caller':117 'categori':149 'consist':95 'contract':65 'cover':183 'data':150 'decim':89 'document':203 'e.g':197 'enabl':36 'endpoint':3,19,37,111,135,161,188 'equal':91 'exact':70,191 'financ':155 'header':124 'howev':179 'id':43 'imag':199 'infrastructur':158 'instant':132 'json':55 'key':114 'learn':154 'limit':130 'list':182 'lowpaymentfee.com':47,143 'lowpaymentfee.com/api/v1/nfts/52/metadata':46 'machin':153 'materi':207 'maximum':73 'metadata':2,18,40,187,196 'model':176 'name':198 'need':116 'network':62 'nft':1,17,39,186 'nft-metadata' 'no-api-key' 'offer':145 'on-chain metadata' 'part':137 'pay':7,23 'pay-per-cal':6,22 'pay-per-call' 'pay-per-request NFT' 'payment':56,123,175 'per':8,24,76,93,170 'per-request':169 'platform':141,164 'post':51 'price':103,172 'provid':98,126 'pure':119 'rate':129 'request':52,94,171 'requir':75 'return':54,195 'schema':192 'scheme':71 'serv':38 'settl':58 'sever':148 'share':165 'sinc':85 'site':101 'site-wid':100 'specif':181 'token':42 'token metadata' 'unit':82 'usdc':13,29,64,84,86 'usdc-settlement' 'use':63,87 'util':159 'via':10,26,67 'web3':156 'wide':102 'x402':11,27,35,69,122,174 'x402 NFT endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d34630c2-b52a-499e-844e-347533b71452","listingId":"683ba9e4-d955-4fe3-bd43-1f91f5b9ca85","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/52/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":"2026-04-21T18:32:33.006Z"}],"sources":[{"listingId":"683ba9e4-d955-4fe3-bd43-1f91f5b9ca85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/52/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.006Z","lastSeenAt":"2026-04-22T04:02:47.548Z"}],"details":{"listingId":"683ba9e4-d955-4fe3-bd43-1f91f5b9ca85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/52/metadata\n# Returns 402 with x402 challenge. Include X-PAYMENT header with a valid payment proof to receive the metadata.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/52/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/nfts/52/metadata"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata (name, image, attributes) for token ID 52 programmatically","Integrating NFT display data into wallets or marketplaces without managing API keys","Agent-driven NFT data retrieval with micropayment settlement on Base"],"bestFor":["Developers needing keyless, pay-per-call NFT metadata access","AI agents that can settle x402 payments on Base","Prototyping NFT-aware applications without subscription commitments"],"notFor":["Bulk retrieval of metadata across many token IDs (only token 52 is exposed at this URL)","Users who need free or subscription-based access rather than per-call crypto payments","Production systems requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.971Z"},"updatedAt":"2026-04-22T04:02:47.548Z"}}