{"id":"9f11e746-6dbd-4af8-b922-e401ae421dc6","shortId":"sQL2QG","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 serves NFT metadata for token ID 90 at `https://lowpaymentfee.com/api/v1/nfts/90/metadata`. It is part of a broader suite of pay-per-request APIs hosted on lowpaymentfee.com, all settling payments in USDC on the Base network via the x402 protocol. The endpoint accepts POST requests and returns JSON.\n\nPricing is straightforward: the x402 challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (contract `0x8335…2913` on Base). Since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site-wide flat rate of $0.02/request advertised on the landing page. No API keys, subscriptions, or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe provider's landing page lists additional API categories (data/analytics, AI/ML, finance/Web3, infrastructure utilities), all at the same $0.02 price point. This specific endpoint falls under the NFT/Web3 category. Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a \"Connect wallet\" prompt with no further detail. No OpenAPI spec or request/response schema was found, so the exact structure of the returned NFT metadata is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-call NFT","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Only token ID 90 is referenced in this endpoint path; unclear if other token IDs are supported via different paths.","Landing page docs (/api, /pricing, /README) all resolve to a 'Connect wallet' stub with no useful content.","Provider identity and terms of service are not documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/90/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/90/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). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no example payloads. The specific NFT metadata content is entirely 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'/api/v1/nfts/90/metadata':48 '/pricing':194 '/readme':196 '/request':16,32,127 '0.02':15,31,114,126,174 '000':97 '0x8335':103 '20':96 '2913':104 '6':110 '90':44 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':80 'addit':162 'advertis':92,128 'ai/ml':166 'api':61,134,163 'attach':144 'base':5,21,72,98,106 'base-network' 'beyond':186 'broader':54 'call':9,25 'caller':142 'categori':164,184 'challeng':91 'connect':202 'consist':117 'contract':102 'data/analytics':165 'decim':111 'detail':208 'document':185 'enabl':36 'endpoint':3,19,37,79,179 'equal':113 'exact':219 'fall':180 'finance/web3':167 'flat':123 'found':216 'header':149 'host':62 'id':43 'infrastructur':168 'json':85 'key':135 'land':131,159,188 'limit':139 'list':161 'lowpaymentfee.com':47,64 'lowpaymentfee.com/api/v1/nfts/90/metadata':46 'maxamountrequir':94 'metadata':2,18,40,225 'network':73 'nft':1,17,39,224 'nft-metadata' 'nft/web3':183 'no-api-key' 'on-chain metadata' 'openapi':210 'page':132,160,189 'part':51 'pay':7,23,58 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':57 'payment':67,148,154 'per':8,24,59,115 'point':176 'post':81 'price':86,175 'prompt':204 'proof':155 'protocol':77 'provid':157 'rate':124,138 'request':60,82,116 'request/response':213 'requir':141 'resolv':199 'return':84,223 'rout':197 'schema':214 'serv':38 'settl':66 'simpli':143 'sinc':107 'site':121 'site-wid':120 'spars':191 'spec':211 'specif':178 'straightforward':88 'structur':220 'subscript':136 'suit':55 'token':42 'token metadata' 'unit':99 'unknown':227 'usdc':13,29,69,101,108 'usdc-settlement' 'use':109 'util':169 'valid':152 'via':10,26,74 'wallet':203 'wide':122 'x':147 'x-payment':146 'x402':11,27,35,76,90,153 'x402 NFT endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f0437db8-2550-4238-83cf-594f9a1da475","listingId":"9f11e746-6dbd-4af8-b922-e401ae421dc6","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/90/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":"2026-04-21T18:32:28.826Z"}],"sources":[{"listingId":"9f11e746-6dbd-4af8-b922-e401ae421dc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/90/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.826Z","lastSeenAt":"2026-04-22T11:33:08.203Z"}],"details":{"listingId":"9f11e746-6dbd-4af8-b922-e401ae421dc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/90/metadata \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/90/metadata"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching metadata for a specific NFT (token 90) programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT data retrieval with automatic micropayment"],"bestFor":["Developers needing NFT metadata without API key management","AI agents that can settle x402 payments on Base","Low-volume, on-demand NFT data lookups"],"notFor":["Bulk retrieval of metadata across many token IDs (only token 90 path documented)","Users who cannot settle USDC payments on Base","Applications requiring detailed OpenAPI documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.058Z"},"updatedAt":"2026-04-22T11:33:08.203Z"}}