{"id":"c7b51735-f4a1-40c3-947d-a76201579a4e","shortId":"qYNfxp","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 at lowpaymentfee.com serves NFT metadata for token ID 3 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in response.\n\nThe provider hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model and settle on the Base network using USDC. The platform advertises no rate limits, no minimums, and instant access.\n\nThis specific endpoint (/api/v1/nfts/3/metadata) returns NFT metadata in application/json format. The exact schema of the returned metadata is not documented, so the response structure must be discovered by making a paid call. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","pay-per-call NFT","Base USDC API","on-chain metadata"],"warnings":["No response schema documented — the structure of the returned NFT metadata is unknown.","Endpoint is scoped to a single NFT (token ID 3); unclear if other token IDs are available at similar paths.","No OpenAPI spec or detailed API documentation available.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/3/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/3/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 well-formed, confirming the endpoint works. However, there is no OpenAPI schema, no documented request/response format, no examples, and the endpoint is narrowly scoped to a single NFT token ID. The broader platform docs are essentially empty beyond a landing page listing 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'/request':16,32,145 '0.02':15,31,57,73,144 '000':67 '20':66 '3':43 '6':71 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'access':166 'account':78 'advertis':158 'ai/ml':115 'analysi':118 'analyt':114 'api':75,111 'application/json':175 'attach':82 'base':5,21,62,68,152 'base-network' 'broader':104 'call':9,25,55,110,198 'caller':81 'challeng':201 'classif':120 'confirm':208 'convers':137 'cost':56 'data':113,123 'decim':72 'discov':193 'document':186 'embed':121 'endpoint':3,19,34,140,169,210 'estim':131 'exact':178 'exchang':126 'feed':125 'finance/web3':122 'form':207 'format':176 'gas':130 'gate':48 'generat':138 'geocod':135 'header':87 'host':102 'id':42 'infer':116 'infrastructur':133 'instant':165 'json':96 'json-response' 'key':76 'limit':161 'live':203 'lowpaymentfee.com':36 'make':195 'maxamountrequir':64 'metadata':2,18,39,97,173,183 'minimum':163 'model':147 'must':191 'need':80 'network':63,153 'nft':1,17,38,172 'nft-metadata' 'no-api-key' 'on-chain metadata' 'oper':212 'paid':197 'pay':7,23,108 'pay-per-cal':6,22,107 'pay-per-call' 'pay-per-call NFT' 'payment':52,86,92 'per':8,24,109 'platform':157 'post':46 'price':124,146 'proof':93 'protocol':53 'provid':101 'quot':129 'rate':127,160 'receiv':95 'request':47 'respons':99,189 'return':171,182 'schema':179 'sentiment':117 'serv':37 'settl':149 'share':141 'span':112 'specif':168 'structur':190 'suit':105 'summar':119 'token':41,128 'token metadata' 'unit':69 'usdc':13,29,59,155 'usdc-settlement' 'use':154 'util':134 'valid':90,136 'via':10,26,44 'well':206 'well-form':205 'x':85 'x-payment':84 'x402':11,27,51,91,200 'x402 NFT' 'x402-payment'","prices":[{"id":"b7cb9416-248e-4931-a4ba-49dffb2616ce","listingId":"c7b51735-f4a1-40c3-947d-a76201579a4e","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/3/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":"2026-04-21T18:32:28.009Z"}],"sources":[{"listingId":"c7b51735-f4a1-40c3-947d-a76201579a4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/3/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.009Z","lastSeenAt":"2026-04-22T18:05:11.096Z"}],"details":{"listingId":"c7b51735-f4a1-40c3-947d-a76201579a4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/3/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 HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/3/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/3/metadata"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for a specific NFT (token ID 3) programmatically","Integrating NFT display data into wallets or marketplaces without API key management","Agent-driven NFT data retrieval with micropayment settlement on Base"],"bestFor":["Developers needing on-demand NFT metadata without subscription commitments","AI agents that can settle x402 micropayments on Base","Applications displaying NFT information that prefer pay-per-use pricing"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token ID 3 is exposed at this path)","Users who need free or pre-paid API access without crypto wallets","Production systems requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.442Z"},"updatedAt":"2026-04-22T18:05:11.096Z"}}