{"id":"05955a46-c0f2-46ac-8635-8a9f3b626254","shortId":"RpSbSL","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 serves NFT metadata for token ID 6 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 gated entirely by the x402 payment header.\n\nThe provider's landing page lists a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request on the Base network. This specific endpoint falls under the NFT/Web3 category. The response MIME type is application/json, and the endpoint accepts POST requests as declared in the outputSchema.\n\nDocumentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and the crawled /api, /pricing, and /README pages returned only a wallet-connect prompt with no additional content. The actual structure of the returned NFT metadata is unknown, so callers should expect a standard JSON object but cannot rely on a documented schema.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT"],"warnings":["No OpenAPI or request/response schema available — callers must discover the expected POST body experimentally.","The /api, /pricing, and /README pages returned no useful documentation (only wallet-connect prompts).","The actual NFT metadata response structure is undocumented.","The provider lists many endpoints but none have detailed docs; quality of service is unverifiable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/6/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/6/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), but there is no OpenAPI spec, no documented request body schema, no example response, and the crawled pages beyond the landing page were empty wallet-connect prompts. Effectively a stub 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'/pricing':186 '/readme':188 '/request':16,32 '0.02':15,31,85,134 '000':78 '0x8335':61 '20':77 '2913':62 '6':46,88 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':158 'access':98 'actual':202 'addit':199 'advertis':97 'ai/ml':125 'amount':72 'analyt':124 'api':91,121 'application/json':154 'base':5,21,56,79,139 'base-network' 'beyond':177 'broad':114 'call':9,25,75,120 'caller':212 'cannot':220 'catalog':115 'categori':148 'challeng':180 'connect':195 'content':200 'contract':60 'crawl':184 'data':123 'decim':89 'declar':162 'document':166,224 'enabl':36 'endpoint':3,19,37,143,157 'entir':101 'equal':84 'exact':67 'exact-pay':66 'expect':214 'fall':144 'finance/web3':127 'gate':100 'header':106 'id':45 'infer':126 'infrastructur':129 'json':217 'key':92 'land':110 'limit':95 'list':112 'lowpaymentfee.com':39 'maximum':71 'metadata':2,18,42,181,208 'mime':151 'minim':168 'network':57,140 'nft':1,17,41,207 'nft-metadata' 'nft/web3':147 'no-api-key' 'object':218 'openapi':172 'outputschema':165 'page':111,189 'pay':7,23,118 'pay-per-cal':6,22,117 'pay-per-call' 'pay-per-request NFT' 'payment':51,68,105 'per':8,24,74,119,135 'post':49,159 'price':132 'prompt':196 'provid':108 'rate':94 'reli':221 'request':50,136,160 'request/response':175 'requir':73 'respons':150 'return':190,206 'schema':176,225 'scheme':69 'serv':40 'settl':53 'span':122 'spec':173 'specif':142 'standard':216 'structur':203 'token':44 'token metadata' 'type':152 'unit':80 'unknown':210 'usdc':13,29,59,82,86 'usdc-settlement' 'use':58,87 'util':130 'via':10,26,47 'wallet':194 'wallet-connect':193 'x402':11,27,35,65,104,179 'x402 NFT endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bc2aa193-cc8f-439f-a0de-a8aea98d8ac3","listingId":"05955a46-c0f2-46ac-8635-8a9f3b626254","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/6/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":"2026-04-21T18:32:33.014Z"}],"sources":[{"listingId":"05955a46-c0f2-46ac-8635-8a9f3b626254","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/6/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.014Z","lastSeenAt":"2026-04-22T04:02:47.572Z"}],"details":{"listingId":"05955a46-c0f2-46ac-8635-8a9f3b626254","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/6/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":"The x402 challenge requires 20,000 base units of USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/nfts/6/metadata"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint accepts POST requests and returns application/json as declared in the x402 outputSchema.","source_url":"https://lowpaymentfee.com/api/v1/nfts/6/metadata"}],"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-provisioned API keys"],"bestFor":["Agents needing keyless, pay-per-call NFT metadata access","Developers prototyping NFT integrations on Base","Low-volume, on-demand NFT metadata queries"],"notFor":["Bulk or high-throughput NFT metadata indexing (no documented batch endpoint)","Querying NFTs on networks other than Base","Use cases requiring a fully documented response schema"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.942Z"},"updatedAt":"2026-04-22T04:02:47.572Z"}}