{"id":"b1ee289b-26c1-4556-ac7f-6002386a09fc","shortId":"BV28se","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 43 via a POST request, gated by the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform offering a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint at `/api/v1/nfts/43/metadata` returns JSON (`application/json`) and accepts payment in USDC on the Base network. The x402 challenge advertises a `maxAmountRequired` of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request, consistent with the site-wide pricing. Payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.\n\nNo OpenAPI schema, detailed documentation, or example responses were found for this specific endpoint. The platform's landing page lists many endpoints but provides no further technical documentation beyond the pricing and category groupings. The actual content of the NFT metadata returned is unknown from the available material.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-base","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","lowpaymentfee NFT","on-chain metadata"],"warnings":["No OpenAPI or detailed documentation available for this endpoint.","The actual NFT metadata content and schema are unknown — no example response was captured.","Only a single token ID (43) is addressed by this endpoint; it is unclear if other token IDs are available at similar paths.","The broader lowpaymentfee.com platform lists many endpoints but docs pages returned only 'Connect wallet' with no substantive content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/43/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/43/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), but there is no OpenAPI schema, no documentation beyond the landing page listing, no example request/response, and the actual metadata content is unknown. This is effectively a stub 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'/request':16,32 '0.02':15,31,81,129 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':118 '300':149 '43':41 '6':125 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':103 'actual':186 'address':143 'advertis':114 'ai/ml':72 'analyt':71 'api':68,86 'application/json':101 'avail':197 'base':5,21,109,120 'beyond':179 'broad':61 'call':9,25,83 'catalog':62 'categori':183 'challeng':113 'commit':93 'consist':132 'content':187 'data':70 'decim':126 'detail':154 'document':155,178 'endpoint':3,19,34,96,164,172 'equal':128 'exampl':157 'finance/web3':74 'found':160 'gate':46 'group':184 'host':54 'id':40 'infer':73 'infrastructur':76 'json':100 'json-response' 'key':87 'land':168 'limit':90 'list':170 'lowpaymentfee NFT' 'lowpaymentfee.com':56 'mani':171 'materi':198 'maxamountrequir':116 'metadata':2,18,37,191 'network':110 'nft':1,17,36,190 'nft-metadata' 'offer':59 'on-chain metadata' 'openapi':152 'page':169 'pay':7,23,65 'pay-per-cal':6,22 'pay-per-request':64 'payment':50,104,139 'per':8,24,66,82,130 'platform':58,166 'post':44 'price':79,138,181 'protocol':51 'provid':174 'rate':89 'request':45,67,131 'respons':158 'return':99,192 'schema':153 'second':150 'serv':35 'settl':141 'sinc':122 'site':136 'site-wid':135 'span':69 'specif':95,163 'technic':177 'timeout':147 'token':39 'token metadata' 'unit':121 'unknown':194 'usdc':13,29,106,123 'usdc-base' 'use':124 'util':77 'via':10,26,42 'wide':137 'x402':11,27,49,112 'x402 NFT' 'x402-payment'","prices":[{"id":"1037bd30-4065-4c4f-a604-4af0bc1b5363","listingId":"b1ee289b-26c1-4556-ac7f-6002386a09fc","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/43/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":"2026-04-21T18:32:28.224Z"}],"sources":[{"listingId":"b1ee289b-26c1-4556-ac7f-6002386a09fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/43/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.224Z","lastSeenAt":"2026-04-22T16:32:58.810Z"}],"details":{"listingId":"b1ee289b-26c1-4556-ac7f-6002386a09fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/43/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 in USDC on Base network with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/nfts/43/metadata"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/43/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"}],"useCases":["Retrieving metadata for NFT token ID 43 programmatically","Integrating NFT metadata into a dApp or marketplace UI","Agent-driven NFT data lookup with micropayment settlement"],"bestFor":["Developers needing on-demand NFT metadata without API key management","AI agents that can settle x402 micropayments on Base","Quick, low-cost one-off metadata lookups"],"notFor":["Bulk retrieval of metadata for large NFT collections (single token ID only)","Users who cannot transact in USDC on the Base network","Applications requiring detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.98Z"},"updatedAt":"2026-04-22T16:32:58.810Z"}}