{"id":"ae5e841e-7d3a-4420-b411-7cd0b7cc0c73","shortId":"UqJ5sm","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 9 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 return.\n\nThe provider, lowpaymentfee.com, 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, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints appear to share the same $0.02/request pricing and x402 payment model on Base. However, the specific endpoint being listed here is `/api/v1/nfts/9/metadata`, which returns NFT metadata.\n\nNo OpenAPI schema, detailed documentation, or example responses were found in the crawl. The endpoint is confirmed live — it returns a proper 402 challenge with x402 version 1 headers. The output is declared as application/json. Without sample responses or schema details, the exact structure of the returned NFT metadata is unknown.","tags":[],"capabilities":["x402-payment","nft-metadata","base-network","usdc-settlement","pay-per-call","no-api-key","json-response"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","pay-per-call NFT","Base USDC API","on-chain metadata"],"warnings":["No OpenAPI or JSON schema available for request or response bodies","No example responses found — NFT metadata structure is unknown","Only token ID 9 is addressable at this specific path; unclear if other token IDs are supported at sibling paths","Provider landing page lists many API categories but no detailed docs were crawlable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/9/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/9/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no OpenAPI schema, no example request/response, and no documentation beyond a brief landing page. The specific NFT metadata structure is entirely unknown, and only a single token ID (9) is exposed at this path. Effectively a stub 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'/request':16,32,145 '0.02':15,31,57,73,144 '000':67 '1':193 '20':66 '402':188 '6':71 '9':43 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'account':78 'ai/ml':116 'analysi':119 'analyt':115 'api':75,112 'appear':139 'application/json':200 'attach':82 'base':5,21,62,68,152 'base-network' 'broader':105 'call':9,25,55,111 'caller':81 'challeng':189 'classif':121 'confirm':182 'convers':136 'cost':56 'crawl':178 'data':114,124 'decim':72 'declar':198 'detail':169,206 'document':170 'embed':122 'endpoint':3,19,34,138,156,180 'estim':130 'exact':208 'exampl':172 'exchang':127 'feed':126 'finance/web3':123 'found':175 'gas':129 'gate':48 'geocod':134 'header':87,194 'host':103 'howev':153 'id':42 'infer':117 'infrastructur':132 'json':96 'json-response' 'key':76 'list':158 'live':183 'lowpaymentfee.com':36,102 'maxamountrequir':64 'metadata':2,18,39,97,165,214 'model':150 'need':80 'network':63 'nft':1,17,38,164,213 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':167 'output':196 'pay':7,23,109 'pay-per-cal':6,22,108 'pay-per-call' 'pay-per-call NFT' 'payment':52,86,92,149 'per':8,24,110 'post':46 'price':125,146 'proof':93 'proper':187 'protocol':53 'provid':101 'rate':128 'receiv':95 'request':47 'respons':173,203 'return':99,163,185,212 'sampl':202 'schema':168,205 'sentiment':118 'serv':37 'share':141 'span':113 'specif':155 'structur':209 'suit':106 'summar':120 'token':41 'token metadata' 'unit':69 'unknown':216 'usdc':13,29,59 'usdc-settlement' 'util':133 'valid':90,135 'version':192 'via':10,26,44 'without':201 'x':85 'x-payment':84 'x402':11,27,51,91,148,191 'x402 NFT' 'x402-payment'","prices":[{"id":"ccb34eb3-08a5-411f-9026-4d0b55cffad2","listingId":"ae5e841e-7d3a-4420-b411-7cd0b7cc0c73","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/9/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":"2026-04-21T18:32:28.854Z"}],"sources":[{"listingId":"ae5e841e-7d3a-4420-b411-7cd0b7cc0c73","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/9/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.854Z","lastSeenAt":"2026-04-22T12:05:29.794Z"}],"details":{"listingId":"ae5e841e-7d3a-4420-b411-7cd0b7cc0c73","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/9/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":"Endpoint returns 402 with x402 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/9/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x8335…) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/9/metadata"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists additional API categories including AI/ML, finance, data analytics, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for a specific NFT (token ID 9) programmatically","Integrating NFT metadata into a dApp or marketplace 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","Projects wanting low-friction NFT data without subscription commitments"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 9 is exposed at this path)","Users who cannot settle USDC payments on the Base network","Applications requiring detailed NFT provenance or transaction history beyond metadata"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.052Z"},"updatedAt":"2026-04-22T12:05:29.794Z"}}