{"id":"951170ca-aaea-4259-b2fb-4cc9d8fca097","shortId":"HKS6Kp","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC (~$0.02/request).","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC (~$0.02/request).","description":"This x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for token ID 32 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted instantly upon valid payment.\n\nThe provider operates a broader platform offering dozens of pay-per-call endpoints 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 listed endpoints share the same $0.02-per-request pricing model on the Base network.\n\nDocumentation is minimal — there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled pages beyond the landing page returned only a wallet-connect prompt. The endpoint is confirmed live (HTTP 402 challenge returned successfully), but the actual response payload structure for NFT metadata is unknown.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT","on-chain metadata"],"warnings":["No OpenAPI or request/response schema available — actual payload structure is unknown","Endpoint is scoped to a single NFT token ID (32); unclear if other token IDs are supported at different paths","Documentation pages (/api, /pricing, /README) returned only a wallet-connect prompt with no useful content","The provider lists many other endpoints on the landing page but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/32/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/32/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 via a valid 402 challenge, but there is no OpenAPI spec, no documented request body schema, no example responses, and the crawled docs pages are empty beyond a landing page listing. The endpoint is narrowly scoped to a single NFT token ID with no explanation of what metadata is 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'0.02':14,29,83,148 '000':76 '0x8335':59 '20':75 '2913':60 '32':44 '402':197 '6':86 'Base USDC API' 'NFT metadata API' 'NFT token info' 'access':96 'across':117 'actual':203 'advertis':95 'ai/ml':122 'amount':70 'analysi':125 'analyt':121 'api':89 'base':5,20,54,77,156 'base-network' 'beyond':169,180 'broader':107 'call':9,24,73,115 'categori':118 'challeng':172,198 'classif':127 'confirm':194 'connect':189 'contract':58 'convers':141 'crawl':178 'data':120 'decim':87 'document':158 'dozen':110 'embed':128 'enabl':34 'endpoint':3,18,35,116,144,192 'equal':82 'estim':135 'exact':65 'exact-pay':64 'exchang':132 'feed':131 'finance/web3':129 'gas':134 'geocod':139 'grant':98 'http':196 'id':43 'includ':119 'infer':123 'infrastructur':137 'instant':99 'key':90 'land':182 'limit':93 'list':143 'live':195 'lowpaymentfee.com':37 'maximum':69 'metadata':2,17,40,209 'minim':160 'model':153 'network':55,157 'nft':1,16,39,208 'nft-metadata' 'no-api-key' 'offer':109 'on-chain metadata' 'openapi':164 'oper':105 'outputschema':174 'page':179,183 'pay':7,22,113 'pay-per-cal':6,21,112 'pay-per-call' 'pay-per-request NFT' 'payload':205 'payment':49,66,102 'per':8,23,72,114,150 'per-request':149 'platform':108 'post':47 'price':130,152 'prompt':190 'provid':104 'rate':92,133 'request':48,151 'request/response':167 'requir':71 'respons':204 'return':184,199 'schema':168 'scheme':67 'sentiment':124 'serv':38 'settl':51 'share':145 'spec':165 'structur':206 'stub':175 'success':200 'summar':126 'token':42 'token metadata' 'unit':78 'unknown':211 'upon':100 'usdc':13,28,57,80,84 'usdc-settlement' 'use':56,85 'util':138 'valid':101,140 'via':10,25,45 'wallet':188 'wallet-connect':187 'x402':11,26,33,63,171 'x402 NFT endpoint' 'x402-enabled':32 'x402-payment'","prices":[{"id":"57d9d88e-0bbe-449a-b3dc-6d4118653be0","listingId":"951170ca-aaea-4259-b2fb-4cc9d8fca097","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/32/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":"2026-04-21T18:32:27.980Z"}],"sources":[{"listingId":"951170ca-aaea-4259-b2fb-4cc9d8fca097","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/32/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.980Z","lastSeenAt":"2026-04-22T18:33:27.511Z"}],"details":{"listingId":"951170ca-aaea-4259-b2fb-4cc9d8fca097","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/32/metadata \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/32/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/32/metadata"},{"claim":"Provider advertises $0.02/request pricing, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/32/metadata"}],"useCases":["Retrieve metadata for a specific NFT (token 32) programmatically","Integrate NFT metadata lookups into agent workflows without API key management","Pay-per-call NFT data access settled on Base L2"],"bestFor":["Agents needing on-demand NFT metadata without subscription commitments","Developers experimenting with x402 payment-gated APIs","Low-volume NFT metadata lookups at $0.02 per request"],"notFor":["Bulk or high-volume NFT metadata scraping (no batch endpoint documented)","Querying arbitrary token IDs (this endpoint is scoped to token 32)","Users who need detailed response schema documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.442Z"},"updatedAt":"2026-04-22T18:33:27.511Z"}}