{"id":"514cb1b8-0144-4f12-9c54-14fae43c020e","shortId":"jNnKYh","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 88 at `https://lowpaymentfee.com/api/v1/nfts/88/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 endpoints. No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint has a maximum payment timeout of 300 seconds.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02 pricing and x402 payment model on Base. However, the specific endpoint listed here is scoped to NFT metadata retrieval for a single token ID. No OpenAPI schema, detailed documentation, or example responses were found in the crawl, so the exact structure of the returned metadata is 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 info endpoint","x402 NFT","pay-per-request NFT","Base USDC API","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available — response structure is unknown","Endpoint is specific to NFT token ID 88; unclear if other token IDs are available at similar paths","No crawled documentation beyond a landing page listing; /api, /pricing, and /README pages returned only a wallet-connect prompt","Provider catalog lists many endpoint categories but none mention NFTs, so this endpoint may be experimental or a demo"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/88/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/88/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, but there is no OpenAPI schema, no documentation of request/response formats, and no example payloads. The endpoint is narrowly scoped to a single NFT token ID with no explanation of what metadata is 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'/request':16,32,96 '0.02':15,31,87,95,175 '000':78 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':66 '20':77 '300':132 '6':83 '88':44 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':50 'across':98 'ai/ml':150 'analyt':149 'api':103,146 'attach':112 'base':5,21,61,79,182 'base-network' 'broader':139 'call':9,25,145 'caller':110 'catalog':140 'classif':154 'consist':89 'contract':65 'convers':169 'crawl':212 'data':148,157 'decim':84 'detail':203 'document':204 'embed':155 'enabl':36 'endpoint':3,19,37,101,125,171,186 'equal':86 'estim':163 'exact':70,215 'exampl':206 'exchang':160 'feed':159 'finance/web3':156 'found':209 'gas':162 'geocod':167 'header':117 'host':137 'howev':183 'id':43,199 'infer':151 'infrastructur':165 'json':55 'key':104 'limit':107 'list':187 'lowpaymentfee.com':47,136 'lowpaymentfee.com/api/v1/nfts/88/metadata':46 'maximum':128 'metadata':2,18,40,193,220 'model':180 'network':62 'nft':1,17,39,192 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':201 'pay':7,23,143 'pay-per-cal':6,22,142 'pay-per-call' 'pay-per-request NFT' 'payment':56,116,122,129,179 'per':8,24,74,144 'post':51 'price':73,97,158,176 'proof':123 'provid':92,135 'rate':106,161 'request':52,75 'requir':109 'respons':207 'retriev':194 'return':54,219 'schema':202 'scheme':71 'scope':190 'second':133 'sentiment':152 'serv':38 'settl':58 'share':172 'simpli':111 'singl':197 'span':147 'specif':185 'structur':216 'summar':153 'timeout':130 'token':42,198 'token metadata' 'uniform':94 'unit':80 'unknown':222 'usd':88 'usdc':13,29,64,82 'usdc-settlement' 'use':63 'util':166 'valid':120,168 'via':10,26,67 'x':115 'x-payment':114 'x402':11,27,35,69,121,178 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ee8d2db3-960e-4c2e-9cc6-bfa66a665b23","listingId":"514cb1b8-0144-4f12-9c54-14fae43c020e","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/88/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":"2026-04-21T18:32:28.872Z"}],"sources":[{"listingId":"514cb1b8-0144-4f12-9c54-14fae43c020e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/88/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.872Z","lastSeenAt":"2026-04-22T12:05:29.794Z"}],"details":{"listingId":"514cb1b8-0144-4f12-9c54-14fae43c020e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/88/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":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/88/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/88/metadata"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers additional API categories including AI/ML, finance, data analytics, and infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for NFT token #88 programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT metadata lookups with micropayments"],"bestFor":["Developers needing on-demand NFT metadata without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic NFT metadata queries where per-call pricing is preferable"],"notFor":["Bulk metadata retrieval across many token IDs (only token 88 is exposed at this URL)","Users who cannot settle USDC payments on the Base network","Applications requiring detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.023Z"},"updatedAt":"2026-04-22T12:05:29.794Z"}}