{"id":"b27f59fb-bd20-46be-893a-7579497aea47","shortId":"c57wYa","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 82 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/82/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). Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are mentioned; access is gated entirely by the x402 micropayment.\n\nThe provider's landing page lists a uniform $0.02/request price across all endpoints and emphasizes a no-key, no-rate-limit, pay-as-you-go model. Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the metadata schema returned. The endpoint is live (402 challenge confirmed), but the lack of documentation makes it difficult to know exactly what fields the metadata response contains.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","micropayment API","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available for request or response payloads.","The /api, /pricing, and /README pages return no useful content (only 'Connect wallet').","Only a single NFT token ID (82) is addressed by this endpoint; unclear if other IDs are available at similar paths.","No information on what fields the metadata response contains."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/82/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/82/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 and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI spec, no example request/response, no documentation of the metadata schema, and the broader site pages are empty beyond a wallet-connect prompt. This is effectively a stub listing with confirmed 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'/api/v1/nfts/82/metadata':91 '/pricing':192 '/readme':194 '/request':16,32,162 '0.02':15,31,118,161 '000':107 '0x8335':112 '20':106 '2913':113 '300':134 '402':229 '6':123 '82':41 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':92 'access':145 'across':164 'advertis':101 'ai/ml':67 'analyt':66 'api':58,138 'base':5,21,85,108,115 'base-network' 'beyond':184 'broader':51 'call':9,25 'challeng':100,230 'confirm':231 'connect':200 'contain':248 'cost':104 'data':65 'decim':124 'descript':219 'detail':207 'difficult':239 'document':183,236 'emphas':168 'endpoint':3,19,34,74,89,166,226 'entir':148 'equal':117 'exact':130,242 'exampl':214 'field':244 'finance/web3':69 'gate':147 'go':181 'id':40 'infer':68 'infrastructur':71 'json':97 'json-response' 'key':139,172 'know':241 'lack':234 'land':156,186 'limit':142,176 'list':158 'live':228 'lowpaymentfee.com':44 'made':127 'make':237 'maximum':103 'mention':144 'metadata':2,18,37,222,246 'micropay':152 'micropayment API' 'model':182 'network':86 'nft':1,17,36 'nft-metadata' 'no-key':170 'no-rate-limit':173 'offer':59 'on-chain metadata' 'openapi':211 'page':157,187 'part':48 'pay':7,23,55,178 'pay-as-you-go':177 'pay-per-cal':6,22 'pay-per-request':54 'payload':216 'payment':78,125 'per':8,24,56,119 'platform':45 'post':93 'price':163 'prompt':202 'protocol':79 'provid':63,154 'rate':141,175 'request':57,94,120 'request/response':215 'respons':247 'return':96,197,224 'rout':195 'schema':223 'scheme':131 'second':135 'serv':35 'settl':80 'span':64 'spars':189 'spec':212 'specif':88 'suit':52 'technic':206 'timeout':136 'token':39 'token metadata' 'uniform':160 'unit':109 'usdc':13,29,82,111,121 'usdc-settlement' 'use':75,122 'util':72 'via':10,26,128 'wallet':201 'x402':11,27,77,99,151 'x402 NFT' 'x402-payment'","prices":[{"id":"eb0ac630-1dfc-49c5-b943-50d0af06418a","listingId":"b27f59fb-bd20-46be-893a-7579497aea47","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/82/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":"2026-04-21T18:32:32.406Z"}],"sources":[{"listingId":"b27f59fb-bd20-46be-893a-7579497aea47","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/82/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.406Z","lastSeenAt":"2026-04-22T09:02:26.147Z"}],"details":{"listingId":"b27f59fb-bd20-46be-893a-7579497aea47","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/82/metadata \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\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 on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/nfts/82/metadata"},{"claim":"The provider lists a uniform $0.02/request price with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/82/metadata"}],"useCases":["Retrieving metadata for NFT token #82 programmatically","Integrating NFT display data into a dApp or marketplace","Demonstrating x402 micropayment-gated API access"],"bestFor":["Developers needing on-demand NFT metadata without API key management","Agents or bots that can settle USDC micropayments on Base","Prototyping x402 payment flows with a low-cost endpoint"],"notFor":["Bulk retrieval of metadata for large NFT collections (single-token endpoint, no batch support documented)","Users who need detailed documentation or guaranteed SLA before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.962Z"},"updatedAt":"2026-04-22T09:02:26.147Z"}}