{"id":"d32a2a09-69b2-4f1c-a1cf-e4a84626fc3e","shortId":"fS4fja","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 94 at `https://lowpaymentfee.com/api/v1/nfts/94/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 price per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the provider's uniform $0.02/request pricing across all their API offerings. No API keys are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The provider advertises no rate limits and instant access.\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 at the same $0.02 price point and all gated by x402 on Base. However, the specific NFT metadata endpoint probed here (`/api/v1/nfts/94/metadata`) is not listed on the provider's landing page among the advertised API categories, so its exact response schema and the nature of the NFT collection it references are unknown.","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 token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT","on-chain metadata"],"warnings":["This specific NFT metadata endpoint (/api/v1/nfts/94/metadata) is not listed on the provider's landing page among advertised APIs — its availability and behavior are unverified beyond the 402 challenge.","No request or response schema is documented; callers must discover the expected POST body by experimentation.","The NFT collection and token 94 identity are unknown — unclear what metadata is actually returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/94/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/94/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 USDC on Base), but there is no documentation of the request body schema, response schema, or what NFT collection token 94 belongs to. The endpoint is not even listed among the provider's advertised APIs. No OpenAPI spec or examples are 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'/request':16,32,96 '0.02':15,31,87,95,164 '000':78 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':66 '20':77 '6':83 '94':44 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':50 'access':130 'across':98 'advertis':124,194 'ai/ml':153 'among':192 'analyt':152 'api':101,104,149,195 'attach':110 'base':5,21,61,79,173 'base-network' 'broader':137 'call':9,25,148 'caller':108 'categori':196 'collect':208 'consist':89 'contract':65 'data':151,156 'decim':84 'dozen':143 'enabl':36 'endpoint':3,19,37,132,179 'equal':86 'exact':70,199 'finance/web3':155 'gate':169 'header':115 'howev':174 'id':43 'infer':154 'instant':129 'json':55 'key':105 'land':190 'limit':127 'list':185 'lowpaymentfee.com':47,140 'lowpaymentfee.com/api/v1/nfts/94/metadata':46 'metadata':2,18,40,178 'natur':204 'network':62 'nft':1,17,39,177,207 'nft-metadata' 'no-api-key' 'offer':102,142 'on-chain metadata' 'page':191 'part':134 'pay':7,23,146 'pay-per-cal':6,22,145 'pay-per-call' 'pay-per-request NFT' 'payment':56,114,120 'per':8,24,74,147 'platform':138 'point':166 'post':51 'price':73,97,165 'probe':180 'proof':121 'provid':92,123,188 'rate':126 'refer':210 'request':52,75 'requir':107 'respons':200 'return':54 'schema':201 'scheme':71 'serv':38 'servic':159 'settl':58 'simpli':109 'span':150 'specif':176 'token':42 'token metadata' 'uniform':94 'unit':80 'unknown':212 'usd':88 'usdc':13,29,64,82 'usdc-settlement' 'use':63 'util':158 'valid':118 'via':10,26,67 'x':113 'x-payment':112 'x402':11,27,35,69,119,171 'x402 NFT endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"16dde6a4-2d7a-4e66-921a-b594d0473346","listingId":"d32a2a09-69b2-4f1c-a1cf-e4a84626fc3e","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/94/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":"2026-04-21T18:32:32.433Z"}],"sources":[{"listingId":"d32a2a09-69b2-4f1c-a1cf-e4a84626fc3e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/94/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.433Z","lastSeenAt":"2026-04-22T09:02:26.176Z"}],"details":{"listingId":"d32a2a09-69b2-4f1c-a1cf-e4a84626fc3e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/94/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing across all APIs, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, maxAmountRequired 20000 (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/94/metadata"},{"claim":"x402 challenge returned with x402Version 1, scheme exact, payTo 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/94/metadata"}],"useCases":["Retrieving metadata for a specific NFT (token 94) programmatically","Integrating NFT display data into wallets or marketplaces without API key management","Agent-driven NFT data lookups with micropayment settlement on Base"],"bestFor":["Developers needing keyless, pay-per-call NFT metadata access","AI agents that can settle x402 payments on Base","Projects wanting low-friction access to NFT data without subscriptions"],"notFor":["Bulk retrieval of metadata across large NFT collections (single-token endpoint)","Users who need free or fiat-only payment options","Applications requiring detailed provenance or ownership history beyond metadata"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.962Z"},"updatedAt":"2026-04-22T09:02:26.176Z"}}