{"id":"73da0e4c-ce90-4bbe-bcad-bcfa325eb6e1","shortId":"EEjGpS","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 87 on the lowpaymentfee.com platform. It is part of a broader suite of x402-gated APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform follow the same pricing model: $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/nfts/87/metadata` accepts POST requests and returns JSON. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment proof. The x402 challenge confirms the endpoint is live, advertising a `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nDocumentation is minimal — the provider's landing page lists available endpoints with prices but does not publish request/response schemas, parameter descriptions, or example payloads for any individual endpoint. The NFT metadata endpoint's actual response structure is unknown beyond the declared `mimeType` of `application/json`. Because of this, the listing carries a lower quality score and appropriate warnings.","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","Base USDC API","pay-per-request NFT","lowpaymentfee"],"warnings":["No request or response schema published — actual payload structure is unknown","Endpoint is specific to NFT token ID 87; unclear if other token IDs are available at similar paths","Provider landing page offers many API categories but no detailed docs for any of them","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/87/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/87/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The endpoint's actual behavior and response shape are 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'/request':16,32 '0.02':15,31,82,148 '000':137 '0x8335':142 '20':136 '2913':143 '6':152 '87':41 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':101 'access':162 'actual':202 'advertis':132,161 'ai/ml':66 'analyt':65 'api':57,155 'application/json':212 'appropri':224 'attach':112 'avail':178 'base':5,21,90,138,145 'base-network' 'beyond':207 'broader':51 'call':9,25,168 'caller':111 'carri':218 'challeng':126 'confirm':127 'contain':118 'data':64 'decim':153 'declar':209 'descript':189 'document':169 'endpoint':3,19,34,73,98,129,179,196,200 'equal':147 'exampl':191 'finance/web3':68 'follow':77 'gate':56 'given':149 'handl':109 'header':117 'id':40 'individu':195 'infer':67 'infrastructur':70 'inlin':110 'json':106 'key':156 'land':175 'limit':159 'list':177,217 'live':131 'lower':220 'lowpaymentfee' 'lowpaymentfee.com':44 'maxamountrequir':134 'metadata':2,18,37,199 'mimetyp':210 'minim':171 'model':81 'network':91 'nft':1,17,36,198 'nft-metadata' 'no-api-key' 'offer':58 'page':176 'paramet':188 'part':48 'pay':7,23,166 'pay-per-cal':6,22,165 'pay-per-call' 'pay-per-request NFT' 'payload':192 'payment':107,116,122 'per':8,24,83,167 'platform':45,76 'post':102 'price':80,181 'proof':123 'protocol':95 'provid':62,173 'publish':185 'pure':164 'qualiti':221 'rate':158 'request':84,103 'request/response':186 'respons':203 'return':105 'schema':187 'score':222 'serv':35 'settl':85 'sign':120 'span':63 'specif':97 'structur':204 'suit':52 'token':39 'token metadata' 'unit':139 'unknown':206 'usdc':13,29,87,141,150 'usdc-settlement' 'util':71 'via':10,26,92 'warn':225 'x':115 'x-payment':114 'x402':11,27,55,94,121,125 'x402 NFT' 'x402-gated':54 'x402-payment'","prices":[{"id":"4ce2f346-ec8c-4ed0-a7d0-c75e196b5719","listingId":"73da0e4c-ce90-4bbe-bcad-bcfa325eb6e1","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/87/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":"2026-04-21T18:32:28.827Z"}],"sources":[{"listingId":"73da0e4c-ce90-4bbe-bcad-bcfa325eb6e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/87/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.827Z","lastSeenAt":"2026-04-22T12:05:29.726Z"}],"details":{"listingId":"73da0e4c-ce90-4bbe-bcad-bcfa325eb6e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/87/metadata \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/87/metadata"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/87/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"}],"useCases":["Retrieving on-chain NFT metadata (token 87) for display in wallets or marketplaces","Agent-driven NFT data lookups without pre-registration or API keys","Integrating NFT metadata into automated Web3 pipelines that settle micropayments in USDC"],"bestFor":["Agents or apps needing quick, keyless access to NFT metadata","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["Bulk or batch NFT metadata fetching across many token IDs (only token 87 is addressed by this endpoint)","Users who need detailed documentation or guaranteed SLAs","Non-crypto workflows that cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.058Z"},"updatedAt":"2026-04-22T12:05:29.726Z"}}