{"id":"92f1a939-f9fc-4a89-8a7f-c4066d12953d","shortId":"3PHC2x","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 x402-enabled endpoint at lowpaymentfee.com returns NFT metadata for a given token (in this case token ID 10) 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, rate limits, or upfront commitments are needed — each request is individually paid at the protocol level.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment, 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 and x402 payment flow on Base.\n\nBecause the specific endpoint path is `/api/v1/nfts/10/metadata`, it appears to serve metadata for NFT token #10. No OpenAPI schema, request body schema, or example response was found in the crawl, so the exact fields returned are unknown. The output MIME type is declared as `application/json`. The payment challenge timeout is 300 seconds.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","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 OpenAPI or request/response schema available — input and output fields are unknown.","Only a single token ID (10) is in the probed path; it is unclear whether other token IDs are supported or how the path is parameterized.","Provider landing page lists many API categories but crawled sub-pages (/api, /pricing, /README) returned only 'Connect wallet' with no additional documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/10/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/10/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing and network info, but there is no OpenAPI schema, no documented request/response body, and no examples. The NFT metadata content is entirely opaque from the crawl 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'/request':16,32,156 '0.02':15,31,91,155 '000':84 '0x8335':67 '10':52,180 '20':83 '2913':68 '300':215 '6':94 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'ai/ml':131 'amount':78 'analyt':130 'api':97,127 'appear':173 'application/json':209 'base':5,21,62,85,164 'base-network' 'bodi':185 'broader':120 'call':9,25,81 'case':49 'catalog':121 'challeng':212 'classif':135 'commit':103 'contract':66 'convers':149 'crawl':194 'data':129 'decim':95 'declar':207 'embed':136 'enabl':36 'endpoint':3,19,37,151,168 'equal':90 'estim':143 'exact':73,197 'exact-pay':72 'exampl':188 'exchang':140 'feed':139 'field':198 'finance/web3':137 'flow':162 'found':191 'gas':142 'geocod':147 'given':45 'host':118 'id':51 'individu':109 'infer':132 'infrastructur':145 'json-response' 'key':98 'level':114 'limit':100 'lowpaymentfee.com':39,117 'maximum':77 'metadata':2,18,42,176 'mime':204 'model':158 'need':105 'network':63 'nft':1,17,41,178 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':182 'output':203 'paid':110 'path':169 'pay':7,23,124 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':123 'payment':57,74,161,211 'per':8,24,80,125 'post':55 'price':138,157 'protocol':113 'provid':116 'rate':99,141 'request':56,107,126,184 'requir':79 'respons':189 'return':40,199 'schema':183,186 'scheme':75 'second':216 'sentiment':133 'serv':175 'settl':59 'share':152 'span':128 'specif':167 'summar':134 'timeout':213 'token':46,50,179 'token metadata' 'type':205 'unit':86 'unknown':201 'upfront':102 'usdc':13,29,65,88,92 'usdc-settlement' 'use':64,93 'util':146 'valid':148 'via':10,26,53 'x402':11,27,35,71,160 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6b19a75a-8b95-482e-9a93-11870408ad42","listingId":"92f1a939-f9fc-4a89-8a7f-c4066d12953d","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/10/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":"2026-04-21T18:32:27.486Z"}],"sources":[{"listingId":"92f1a939-f9fc-4a89-8a7f-c4066d12953d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/10/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.486Z","lastSeenAt":"2026-04-22T21:32:16.204Z"}],"details":{"listingId":"92f1a939-f9fc-4a89-8a7f-c4066d12953d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/10/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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","source_url":"https://lowpaymentfee.com/api/v1/nfts/10/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/10/metadata"},{"claim":"All endpoints on the site are priced at $0.02/request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Payment timeout is 300 seconds and the USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/10/metadata"}],"useCases":["Retrieve NFT metadata for display in a marketplace or wallet UI","Programmatic lookup of NFT attributes for indexing or analytics","Agent-driven NFT data retrieval with automatic micropayment"],"bestFor":["Developers needing NFT metadata without managing API keys","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic NFT data lookups where per-call pricing is economical"],"notFor":["Bulk NFT metadata ingestion across thousands of tokens (no batch endpoint documented)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.327Z"},"updatedAt":"2026-04-22T21:32:16.204Z"}}