{"id":"7ed09de6-c356-4a7e-9944-61db8b851041","shortId":"VkHGua","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 34 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 via the X-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 (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform share the same $0.02/request pricing model.\n\nThe specific content returned by this NFT metadata endpoint is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI spec, no request/response schema, and no example payloads available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but the actual data shape of a successful response 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 info endpoint","x402 NFT","Base USDC API","pay-per-call NFT","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response payload structure is completely unknown — no examples or field descriptions","Endpoint is scoped to a single NFT token ID (34); unclear if other IDs are supported at different paths","The platform pages (/api, /pricing, /README) returned no useful content beyond a wallet-connect prompt"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/34/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/34/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, but there is no OpenAPI spec, no request/response schema, no documentation of what the NFT metadata actually contains, and the crawled pages beyond the homepage returned only 'Connect wallet' stubs. This is effectively a stub 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'0.02':15,31,76,158 '000':80 '0x8335':67 '20':79 '2913':68 '34':41 '402':206 '6':84 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':55 'access':179 'actual':210 'ai/ml':127 'analysi':130 'analyt':126 'api':87,123,178 'avail':193 'base':5,21,52,70,81 'base-network' 'beyond':174 'broader':112 'call':9,25,78 'challeng':207 'classif':132 'confirm':201 'content':164 'contract':66 'convers':148 'cost':74 'crawl':196 'data':125,211 'decim':85 'document':173 'dozen':118 'embed':133 'endpoint':3,19,34,107,151,170,199 'estim':142 'exampl':191 'exchang':137 'feed':136 'finance/web3':134 'gas':141 'gate':122 'generat':149 'generic':176 'geocod':146 'header':105 'id':40 'individu':98 'infer':128 'infrastructur':144 'json':60 'key':88 'label':180 'limit':90 'live':202 'lowpaymentfee' 'lowpaymentfee.com':115 'materi':197 'maximum':73 'metadata':2,18,37,169 'model':161 'network':53 'nft':1,17,36,168 'nft-metadata' 'no-api-key' 'offer':117 'openapi':184 'paid':99 'part':109 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payload':192 'payment':61,104 'per':8,24,46,77 'platform':113,154 'post':56 'premium':177 'price':135,160 'protocol':49 'quot':140 'rate':89,138 'request':47,57,96 'request/response':187 'requir':94 'respons':216 'return':59,165,203 'schema':188 'sentiment':129 'serv':35 'settl':63 'shape':212 'share':155 'span':124 'spec':185 'specif':163 'subscript':92 'success':215 'summar':131 'token':39,139 'token metadata' 'unit':82 'unknown':218 'usdc':13,29,65 'usdc-settlement' 'util':145 'valid':147,205 'via':10,26,42,100 'x':103 'x-payment':102 'x402':11,27,48,121 'x402 NFT' 'x402-gated':120 'x402-payment'","prices":[{"id":"6566bc19-88c8-4ded-b54e-fa324e63ea65","listingId":"7ed09de6-c356-4a7e-9944-61db8b851041","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/34/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":"2026-04-21T18:32:28.034Z"}],"sources":[{"listingId":"7ed09de6-c356-4a7e-9944-61db8b851041","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/34/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.034Z","lastSeenAt":"2026-04-22T18:33:27.580Z"}],"details":{"listingId":"7ed09de6-c356-4a7e-9944-61db8b851041","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/34/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":"Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/nfts/34/metadata"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/34/metadata"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata for token ID 34 without managing API keys","Programmatic access to NFT data with micropayment settlement on Base","Agent-driven NFT metadata lookups paid per-call in USDC"],"bestFor":["Agents or scripts that need NFT metadata with zero-setup authentication","Developers wanting pay-as-you-go access without subscriptions","Web3 applications that already hold USDC on Base"],"notFor":["Bulk retrieval of metadata across many NFT collections (only serves token 34)","Users who need detailed documentation or response schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.43Z"},"updatedAt":"2026-04-22T18:33:27.580Z"}}