{"id":"d3804418-861c-4868-b985-ba64bf389f09","shortId":"rLSFcK","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 26 via the x402 payment protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) using the \"exact\" scheme, with a maximum amount of 20,000 base units — equivalent to $0.02 given USDC's 6 decimals. No API keys or rate limits are required; access is gated entirely by the x402 micropayment challenge.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. However, this specific listing covers only the NFT metadata route at /api/v1/nfts/26/metadata. The platform advertises no minimums, no commitments, and instant access.\n\nBecause there is no OpenAPI schema, no documentation beyond the landing page, and no example request/response payloads available, the actual structure of the returned NFT metadata is unknown. The endpoint is confirmed live (returns a proper 402 challenge), but the content and quality of the metadata it serves cannot be verified from the available material.","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 network NFT","micropayment API","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Only token ID 26 is referenced in this endpoint path; unclear if other token IDs are supported via different routes.","No crawled documentation beyond a landing page listing many endpoints with identical pricing — actual functionality is unverified.","The platform pages (/api, /pricing, /README) all returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/26/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/26/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 with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and no example payloads. The actual NFT metadata content is entirely unknown, making this effectively a stub 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'/request':16,32 '0.02':15,31,82,137 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '20':76 '26':41 '402':198 '6':86 'Base network NFT' 'NFT info endpoint' 'NFT metadata API' 'accept':52 'access':96,161 'actual':181 'advertis':154 'ai/ml':127 'amount':74 'analyt':126 'api':89,123 'avail':179,215 'base':5,21,49,66,78 'base-network' 'beyond':170 'broader':111 'call':9,25,122 'cannot':210 'challeng':104,199 'commit':158 'confirm':193 'content':202 'contract':63 'cover':144 'data':125,130 'decim':87 'document':169 'dozen':117 'endpoint':3,19,34,106,191 'entir':99 'equival':80 'exact':69 'exampl':176 'finance/web3':129 'gate':98 'given':83 'howev':140 'id':40 'infer':128 'instant':160 'json':57 'key':90 'land':172 'limit':93 'list':143 'live':194 'lowpaymentfee.com':114 'materi':216 'maximum':73 'metadata':2,18,37,148,187,207 'micropay':103 'micropayment API' 'minimum':156 'network':50 'nft':1,17,36,147,186 'nft-metadata' 'no-api-key' 'offer':116 'openapi':166 'page':173 'part':108 'pay':7,23,120 'pay-per-cal':6,22,119 'pay-per-call' 'pay-per-request NFT' 'payload':178 'payment':45,58 'per':8,24,121,138 'platform':112,153 'post':53 'price':135 'proper':197 'protocol':46 'qualiti':204 'rate':92 'request':54,139 'request/response':177 'requir':95 'return':56,185,195 'rout':149 'schema':167 'scheme':70 'serv':35,209 'servic':133 'settl':60 'span':124 'specif':142 'structur':182 'token':39 'token metadata' 'unit':79 'unknown':189 'usdc':13,29,62,84 'usdc-settlement' 'use':67 'util':132 'verifi':212 'via':10,26,42 'x402':11,27,44,102 'x402 NFT' 'x402-payment'","prices":[{"id":"ce8d8920-5c1e-441e-a8fb-1f95c9c8c24a","listingId":"d3804418-861c-4868-b985-ba64bf389f09","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/26/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":"2026-04-21T18:32:27.879Z"}],"sources":[{"listingId":"d3804418-861c-4868-b985-ba64bf389f09","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/26/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.879Z","lastSeenAt":"2026-04-22T19:33:09.122Z"}],"details":{"listingId":"d3804418-861c-4868-b985-ba64bf389f09","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/26/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 a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/26/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/26/metadata"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata for display in wallets or marketplaces","Programmatic access to NFT attributes for indexing or analytics","Agent-driven NFT data retrieval with automatic micropayment settlement"],"bestFor":["Developers needing NFT metadata without managing API keys","AI agents that can settle x402 payments autonomously","Low-volume or sporadic NFT metadata lookups where per-call pricing is preferable"],"notFor":["Bulk NFT metadata ingestion across thousands of tokens (no batch endpoint documented)","Users who need metadata for NFTs outside token ID 26 on this specific route"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.695Z"},"updatedAt":"2026-04-22T19:33:09.122Z"}}