{"id":"a7042498-264d-4347-b6ff-cf1c2266f6f8","shortId":"KwkaUm","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 serves NFT metadata for token ID 89 on the lowpaymentfee.com platform. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/nfts/89/metadata` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys are required; payment is handled inline via the X-PAYMENT header. The provider advertises no rate limits and instant access.\n\nDocumentation is minimal — the provider's landing page lists available endpoints and pricing but does not provide request/response schemas, parameter descriptions, or example payloads for any endpoint, including this NFT metadata one. The exact structure of the returned metadata (e.g., whether it follows ERC-721 metadata standards with name, description, image fields) is not documented and must be inferred or discovered by making a paid call.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","ERC-721 metadata","NFT info endpoint","on-chain NFT data","x402 NFT API","Base USDC API"],"warnings":["No request or response schema documented — callers must discover the payload format by trial","Endpoint is scoped to a single NFT token ID (89); unclear how to query other tokens","Provider landing page lists many API categories but none have detailed documentation","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/89/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/89/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 documentation of request parameters, response schema, or examples. The NFT metadata use case is narrow (single token ID). No OpenAPI spec or detailed docs are 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'/api/v1/nfts/89/metadata':91 '/request':16,32 '0.02':15,31,118 '000':107 '0x8335':112 '20':106 '2913':113 '6':123 '89':41 'Base USDC API' 'ERC-721 metadata' 'NFT info endpoint' 'NFT metadata API' 'accept':92 'access':148 'advertis':101,142 'ai/ml':67 'analyt':66 'api':58,126 'avail':158 'base':5,21,85,108,115 'base-network' 'broader':51 'call':9,25,214 'challeng':100 'cost':104 'data':65 'decim':124 'descript':169,198 'discov':209 'document':149,203 'e.g':188 'endpoint':3,19,34,74,89,159,175 'equal':117 'erc':192 'exact':182 'exampl':171 'field':200 'finance/web3':69 'follow':191 'handl':132 'header':139 'id':40 'imag':199 'includ':176 'infer':68,207 'infrastructur':71 'inlin':133 'instant':147 'json':97 'key':127 'land':155 'limit':145 'list':157 'lowpaymentfee.com':44 'make':211 'maximum':103 'metadata':2,18,37,179,187,194 'minim':151 'must':205 'name':197 'network':86 'nft':1,17,36,178 'nft-metadata' 'no-api-key' 'offer':59 'on-chain NFT data' 'one':180 'page':156 'paid':213 'paramet':168 'part':48 'pay':7,23,55 'pay-per-cal':6,22 'pay-per-request':54 'payload':172 'payment':78,130,138 'per':8,24,56,119 'platform':45 'post':93 'price':161 'protocol':79 'provid':63,141,153,165 'rate':144 'request':57,94,120 'request/response':166 'requir':129 'return':96,186 'schema':167 'serv':35 'settl':80 'span':64 'specif':88 'standard':195 'structur':183 'suit':52 'token':39 'token metadata' 'unit':109 'usdc':13,29,82,111,121 'usdc-settlement' 'use':75,122 'util':72 'via':10,26,134 'whether':189 'x':137 'x-payment':136 'x402':11,27,77,99 'x402 NFT API' 'x402-payment'","prices":[{"id":"b8eb323b-c6d9-4af8-a60a-ee148ad1c318","listingId":"a7042498-264d-4347-b6ff-cf1c2266f6f8","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/89/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":"2026-04-21T18:32:28.789Z"}],"sources":[{"listingId":"a7042498-264d-4347-b6ff-cf1c2266f6f8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/89/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.789Z","lastSeenAt":"2026-04-22T12:05:29.534Z"}],"details":{"listingId":"a7042498-264d-4347-b6ff-cf1c2266f6f8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/89/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/89/metadata"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/89/metadata"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for a specific NFT (token 89) programmatically","Integrating NFT display data into a dApp or marketplace frontend","Automated agents fetching NFT attributes without managing API keys"],"bestFor":["Developers needing quick, keyless access to NFT metadata","Agent workflows that can settle micropayments in USDC on Base","Projects already using x402 payment protocol for API access"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 89 is served at this path)","Users who need free or subscription-based access without per-call crypto payments","Applications requiring detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.16Z"},"updatedAt":"2026-04-22T12:05:29.534Z"}}