{"id":"4cd0f875-a7d3-4942-8d0e-9262eb13fa35","shortId":"gtgeNJ","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 at lowpaymentfee.com serves NFT metadata for token ID 84 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.\n\nThe provider (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request and settled in USDC on Base. This specific endpoint is scoped to NFT metadata retrieval. The x402 challenge confirms the endpoint is live, accepts x402 version 1 with the \"exact\" payment scheme, and pays out to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The asset contract (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) is the canonical USDC contract on Base.\n\nNo OpenAPI schema, request body schema, or response examples are provided by the site. The endpoint's actual metadata content (what fields are returned for NFT #84) is unknown from the available material. Documentation pages (/api, /pricing, /README) all resolve to a minimal \"Connect wallet\" page with no further detail.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","pay-per-request NFT","Base USDC API","on-chain metadata"],"warnings":["No OpenAPI or request/response schema available — actual response format is unknown","Documentation pages (/api, /pricing, /README) return only a 'Connect wallet' stub with no useful content","Endpoint is scoped to a single NFT (token 84); unclear if other token IDs are supported at different paths","No information on what metadata fields are returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/84/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/84/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no request/response examples, and documentation pages are empty. The endpoint is narrowly scoped to a single NFT token ID with no explanation of what metadata is 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'/pricing':214 '/readme':215 '/request':16,32 '0.02':15,31,57,73,126 '000':67 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':166 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':170 '1':155 '20':66 '6':71 '84':43,204 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':152 'account':78 'actual':195 'address':165 'ai/ml':116 'analyt':115 'api':75,112 'asset':168 'attach':82 'avail':209 'base':5,21,62,68,134,177 'base-network' 'bodi':182 'broader':105 'call':9,25,55,111 'caller':81 'canon':173 'catalog':106 'challeng':146 'confirm':147 'connect':221 'content':197 'contract':169,175 'cost':56 'data':114,119 'decim':72 'detail':227 'document':211 'endpoint':3,19,34,137,149,193 'exact':158 'exampl':186 'field':199 'finance/web3':118 'gate':48 'header':87 'host':103 'id':42 'infer':117 'json':96 'key':76 'live':151 'lowpaymentfee.com':36,102 'materi':210 'maxamountrequir':64 'metadata':2,18,39,97,142,196 'minim':220 'need':80 'network':63 'nft':1,17,38,141,203 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':179 'page':212,223 'pay':7,23,109,162 'pay-per-cal':6,22,108 'pay-per-call' 'pay-per-request NFT' 'payment':52,86,92,159 'per':8,24,110,127 'post':46 'price':124 'proof':93 'protocol':53 'provid':101,188 'receiv':95 'request':47,128,181 'resolv':217 'respons':185 'retriev':143 'return':99,201 'schema':180,183 'scheme':160 'scope':139 'serv':37 'servic':122 'settl':130 'site':191 'span':113 'specif':136 'token':41 'token metadata' 'unit':69 'unknown':206 'usdc':13,29,59,132,174 'usdc-settlement' 'util':121 'valid':90 'version':154 'via':10,26,44 'wallet':222 'x':85 'x-payment':84 'x402':11,27,51,91,145,153 'x402 NFT' 'x402-payment'","prices":[{"id":"f0b4c37c-fe91-4e58-bcc5-3815b191c32e","listingId":"4cd0f875-a7d3-4942-8d0e-9262eb13fa35","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/84/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":"2026-04-21T18:32:32.378Z"}],"sources":[{"listingId":"4cd0f875-a7d3-4942-8d0e-9262eb13fa35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/84/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.378Z","lastSeenAt":"2026-04-22T09:02:26.115Z"}],"details":{"listingId":"4cd0f875-a7d3-4942-8d0e-9262eb13fa35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/84/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/84/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/nfts/84/metadata"},{"claim":"Asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/84/metadata"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /api, /pricing, /README show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Retrieve metadata for NFT token #84 programmatically","Integrate NFT metadata into a dApp or marketplace without managing API keys","Demonstrate x402 micropayment flow for gated content"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand NFT metadata without subscription","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["Bulk NFT metadata scraping across many collections (only serves token 84)","Users who need detailed API documentation or response schema guarantees","Free-tier or non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.096Z"},"updatedAt":"2026-04-22T09:02:26.115Z"}}