{"id":"76154854-2eff-472a-860d-c501cbf73e22","shortId":"8cAbjh","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 50 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 hosts a broader suite of pay-per-call APIs across categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing model, no rate limits, and no minimum commitments. Settlement occurs on the Base L2 network using USDC (contract 0x8335…2913).\n\nThis specific endpoint returns NFT metadata in application/json format. The exact schema of the returned metadata is not documented, and no OpenAPI spec or detailed docs were found. The provider's site is largely a listing page with wallet-connect functionality but minimal technical documentation.","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 network NFT API","USDC micropayment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response body structure for NFT metadata is undocumented","Provider pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'","It is unclear what NFT collection token ID 50 belongs to or what metadata fields are returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/50/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/50/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). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The specific NFT metadata structure is entirely 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'0.02':15,31,57,73,142 '000':67 '0x8335':163 '20':66 '2913':164 '50':43 '6':71 'Base network NFT API' 'NFT info endpoint' 'NFT metadata API' 'USDC micropayment API' 'account':78 'across':112 'ai/ml':117 'analysi':120 'analyt':116 'api':75,111 'application/json':172 'attach':82 'base':5,21,62,68,157 'base-network' 'broader':104 'call':9,25,55,110 'caller':81 'categori':113 'classif':122 'commit':152 'connect':205 'contract':162 'convers':136 'cost':56 'data':115 'decim':72 'detail':189 'doc':190 'document':183,210 'embed':123 'endpoint':3,19,34,138,167 'estim':130 'exact':175 'exchang':127 'feed':126 'finance/web3':124 'format':173 'found':192 'function':206 'gas':129 'gate':48 'geocod':134 'header':87 'host':102 'id':42 'includ':114 'infer':118 'infrastructur':132 'json':96 'json-response' 'key':76 'l2':158 'larg':198 'limit':148 'list':200 'lowpaymentfee.com':36 'maxamountrequir':64 'metadata':2,18,39,97,170,180 'minim':208 'minimum':151 'model':145 'need':80 'network':63,159 'nft':1,17,38,169 'nft-metadata' 'no-api-key' 'occur':154 'openapi':186 'page':201 '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 'post':46 'price':125,144 'proof':93 'protocol':53 'provid':101,194 'rate':128,147 'receiv':95 'request':47 'return':99,168,179 'schema':176 'sentiment':119 'serv':37 'settlement':153 'share':139 'site':196 'spec':187 'specif':166 'suit':105 'summar':121 'technic':209 'token':41 'token metadata' 'unit':69 'usdc':13,29,59,161 'usdc-settlement' 'use':160 'util':133 'valid':90,135 'via':10,26,44 'wallet':204 'wallet-connect':203 'x':85 'x-payment':84 'x402':11,27,51,91 'x402 NFT' 'x402-payment'","prices":[{"id":"b8b0f6c7-4efd-4c53-ab06-966f34a18633","listingId":"76154854-2eff-472a-860d-c501cbf73e22","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/50/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":"2026-04-21T18:32:32.928Z"}],"sources":[{"listingId":"76154854-2eff-472a-860d-c501cbf73e22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/50/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.928Z","lastSeenAt":"2026-04-22T04:02:47.469Z"}],"details":{"listingId":"76154854-2eff-472a-860d-c501cbf73e22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/50/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 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/50/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/50/metadata"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching on-chain NFT metadata for display in wallets or marketplaces","Programmatic retrieval of NFT attributes for indexing or analytics","Agent-driven NFT data lookups without pre-registration or API keys"],"bestFor":["Agents needing NFT metadata without account setup","Developers wanting pay-as-you-go NFT data access on Base","Low-volume or sporadic NFT metadata queries"],"notFor":["Bulk retrieval of metadata for large NFT collections (no batch endpoint documented)","Use cases requiring detailed API documentation or OpenAPI schemas","Free-tier or zero-cost NFT metadata needs (every call costs $0.02)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.165Z"},"updatedAt":"2026-04-22T04:02:47.469Z"}}