{"id":"ddf1b23f-42df-4ada-9bae-c8d5975aaae2","shortId":"VgKDZ3","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 61 via a pay-per-request x402 protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is individually paid through the x402 payment header.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. However, this specific listing covers only the NFT metadata route at `/api/v1/nfts/61/metadata`.\n\nBecause there is no OpenAPI schema, no documentation beyond the landing page, and no example responses available, the actual structure of the returned metadata is unknown. The endpoint is confirmed live (returns a valid 402 challenge), but consumers should be aware that the response format is undocumented.","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 info endpoint","x402 NFT","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or response schema available — the structure of the returned NFT metadata is unknown.","No documentation exists for this specific endpoint beyond the generic landing page.","It is unclear what NFT collection token ID 61 belongs to or what metadata fields are returned.","The broader platform lists many endpoints but none have detailed docs in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/61/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/61/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 402 challenge, confirming it accepts payments. However, there is no OpenAPI schema, no documented response format, no example responses, and no description of what NFT collection or data is served. The listing is essentially a stub with confirmed 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'/request':16,32 '0.02':15,31,76,137 '000':80 '0x8335':67 '20':79 '2913':68 '402':186 '6':84 '61':41 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':55 'actual':170 'ai/ml':126 'analyt':125 'api':87,122 'avail':168 'awar':192 'base':5,21,52,70,81 'base-network' 'beyond':160 'broader':111 'call':9,25,78 'challeng':187 'confirm':181 'consum':189 'contract':66 'cost':74 'cover':144 'data':124,129 'decim':85 'document':159 'dozen':117 'endpoint':3,19,34,106,179 'exampl':166 'finance/web3':128 'format':196 'gate':121 'header':104 'howev':140 'id':40 'individu':98 'infer':127 'json':60 'key':88 'land':162 'limit':90 'list':143 'live':182 'lowpaymentfee.com':114 'maximum':73 'metadata':2,18,37,148,175 'network':53 'nft':1,17,36,147 'nft-metadata' 'no-api-key' 'offer':116 'openapi':156 'page':163 'paid':99 'part':108 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':61,103 'per':8,24,46,77,138 'platform':112 'post':56 'price':134 'protocol':49 'rate':89 'request':47,57,96,139 'requir':94 'respons':167,195 'return':59,174,183 'rout':149 'schema':157 'serv':35 'servic':132 'settl':63 'span':123 'specif':142 'structur':171 'subscript':92 'token':39 'token metadata' 'undocu':198 'uniform':135 'unit':82 'unknown':177 'usdc':13,29,65 'usdc-settlement' 'util':131 'valid':185 'via':10,26,42 'x402':11,27,48,102,120 'x402 NFT' 'x402-gated':119 'x402-payment'","prices":[{"id":"cb8e811b-730a-4379-a1fa-78e2874d37cb","listingId":"ddf1b23f-42df-4ada-9bae-c8d5975aaae2","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/61/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":"2026-04-21T18:32:32.902Z"}],"sources":[{"listingId":"ddf1b23f-42df-4ada-9bae-c8d5975aaae2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/61/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.902Z","lastSeenAt":"2026-04-22T05:32:24.150Z"}],"details":{"listingId":"ddf1b23f-42df-4ada-9bae-c8d5975aaae2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/61/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":"Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/nfts/61/metadata"},{"claim":"Platform 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/61/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 managing API keys"],"bestFor":["Agents needing keyless, per-call NFT metadata access","Developers who want to pay with USDC on Base without subscriptions","Quick one-off NFT metadata lookups"],"notFor":["Bulk retrieval of metadata across many token IDs (no batch endpoint documented)","Users who need detailed API documentation or response schema guarantees","Non-crypto workflows that cannot send x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.28Z"},"updatedAt":"2026-04-22T05:32:24.150Z"}}