{"id":"d2b125df-ed7c-4c47-9585-168fc1e95897","shortId":"BhX76A","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 token ID 35 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 — callers simply attach the x402 payment header and receive a JSON response.\n\nThe provider hosts a broader catalog 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 are listed at the same $0.02/request price point. However, this specific listing covers only the NFT metadata endpoint at /api/v1/nfts/35/metadata.\n\nDocumentation is minimal. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional content. The actual structure of the NFT metadata response is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Only a single NFT token ID (35) is exposed at this URL; unclear if other token IDs are available at different paths.","Crawled /api, /pricing, and /README pages returned only a wallet-connect prompt with no useful content.","Provider description is generic ('Premium API Access') and does not describe the NFT metadata specifically."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/35/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/35/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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, and no documentation beyond a landing page listing. The actual NFT metadata content and expected POST body are entirely unknown, making this effectively a stub 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'/request':16,32,154 '0.02':15,31,85,153 '000':78 '0x8335':61 '20':77 '2913':62 '35':46 '6':88 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'actual':206 'addit':203 'advertis':97 'ai/ml':125 'amount':72 'analysi':128 'analyt':124 'api':91,121 'attach':100 'base':5,21,56,79 'base-network' 'beyond':180 'broader':114 'call':9,25,75,120 'caller':98 'catalog':115 'challeng':183 'classif':130 'connect':199 'content':204 'contract':60 'convers':145 'cover':161 'crawl':189 'data':123,133 'decim':89 'doc':190 'document':169 'embed':131 'enabl':36 'endpoint':3,19,37,147,166 'equal':84 'estim':139 'exact':67 'exact-pay':66 'exchang':136 'feed':135 'finance/web3':132 'gas':138 'geocod':143 'header':104 'host':112 'howev':157 'id':45 'infer':126 'infrastructur':141 'json':108 'key':92 'limit':95 'list':149,160 'lowpaymentfee.com':39 'maximum':71 'metadata':2,18,42,165,211 'minim':171 'network':57 'nft':1,17,41,164,210 'nft-metadata' 'no-api-key' 'openapi':175 'outputschema':185 'page':193 'pay':7,23,118 'pay-per-cal':6,22,117 'pay-per-call' 'pay-per-request NFT' 'payment':51,68,103 'per':8,24,74,119 'point':156 'post':49 'price':134,155,192 'prompt':200 'provid':111 'rate':94,137 'receiv':106 'request':50 'request/response':178 'requir':73 'respons':109,212 'return':40,194 'schema':179 'scheme':69 'sentiment':127 'settl':53 'simpli':99 'span':122 'spec':176 'specif':159 'structur':207 'stub':186 'summar':129 'token':44 'token metadata' 'unit':80 'unknown':214 'usdc':13,29,59,82,86 'usdc-settlement' 'use':58,87 'util':142 'valid':144 'via':10,26,47 'wallet':198 'wallet-connect':197 'x402':11,27,35,65,102,182 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bf85a895-cc26-4409-8b49-16daafadfc02","listingId":"d2b125df-ed7c-4c47-9585-168fc1e95897","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/35/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":"2026-04-21T18:32:33.070Z"}],"sources":[{"listingId":"d2b125df-ed7c-4c47-9585-168fc1e95897","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/35/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.070Z","lastSeenAt":"2026-04-22T04:02:47.633Z"}],"details":{"listingId":"d2b125df-ed7c-4c47-9585-168fc1e95897","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/35/metadata \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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/35/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/35/metadata"},{"claim":"Provider advertises $0.02/request, 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/35/metadata"}],"useCases":["Retrieving on-chain NFT metadata for display in wallets or marketplaces","Agent-driven NFT data lookups without managing API keys","Programmatic access to NFT attributes for indexing or analytics"],"bestFor":["Agents needing keyless, pay-per-call NFT metadata access","Developers building on Base who want frictionless API payments","Low-volume or sporadic NFT metadata queries where subscriptions are overkill"],"notFor":["Bulk NFT metadata ingestion across many token IDs (only token 35 is exposed at this URL)","Users who need detailed documentation or guaranteed SLAs","Free-tier seekers — every call costs $0.02 in USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.82Z"},"updatedAt":"2026-04-22T04:02:47.633Z"}}