{"id":"b5e82b8c-ab1a-4fed-b633-f7d66c8896ca","shortId":"JfwBDF","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 91 via a pay-per-request x402 protocol on the Base network. The caller sends a POST request with an X-PAYMENT header containing a USDC payment proof, and receives JSON metadata in return. The payment settles on-chain using USDC (contract 0x8335…2913) on Base.\n\nThe endpoint is part of a broader API platform at lowpaymentfee.com that offers dozens of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; authentication and billing are handled entirely through the x402 payment challenge.\n\nThe x402 challenge confirms the endpoint is live, accepting the \"exact\" payment scheme with a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema or detailed documentation for the response body was found beyond the generic \"Premium API Access\" description and application/json MIME type.","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 token info","on-chain metadata","x402 NFT endpoint","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or response schema available — response structure is unknown","Endpoint is specific to NFT token ID 91; unclear if other token IDs are supported at similar paths","No crawled documentation beyond the landing page listing; /api, /pricing, and /README pages returned only a wallet-connect prompt","The actual content/utility of the returned NFT metadata is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/91/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/91/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no documented request/response body, and no information about what metadata fields are returned. The endpoint is narrowly scoped to a single NFT token ID with no broader 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'0.02':15,31,120,173 '000':164 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':180 '0x8335':86 '20':163 '2913':87 '300':183 '6':169 '91':41 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':154 'access':134,203 'across':106 'address':179 'advertis':125 'ai':109 'analyt':108 'api':97,127,202 'application/json':206 'authent':135 'base':5,21,52,89,165 'base-network' 'beyond':198 'bill':137 'bodi':195 'broader':96 'call':9,25 'caller':55 'categori':116 'chain':82 'challeng':145,148 'confirm':149 'contain':66 'contract':85 'data':107 'decim':170 'descript':204 'detail':190 'direct':177 'document':191 'dozen':103 'endpoint':3,19,34,91,105,151 'entir':140 'equal':172 'exact':156 'financ':112 'found':197 'generic':200 'handl':139 'header':65 'id':40 'infrastructur':115 'instant':133 'json':73 'json-response' 'key':128 'learn':111 'limit':131 'live':153 'lowpaymentfee.com':100 'machin':110 'maxamountrequir':161 'metadata':2,18,37,74 'mime':207 'network':53 'nft':1,17,36 'nft-metadata' 'offer':102 'on-chain':80 'on-chain metadata' 'openapi':187 'part':93 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':64,69,78,144,157,175 'per':8,24,46,121 'platform':98,124 'post':58 'premium':201 'price':118 'proof':70 'protocol':49 'rate':130 'receiv':72 'request':47,59,122 'respons':194 'return':76 'schema':188 'scheme':158 'second':184 'send':56 'serv':35 'settl':79 'timeout':185 'token':39 'token metadata' 'type':208 'unit':166 'usdc':13,29,68,84,168 'usdc-settlement' 'use':83 'via':10,26,42 'web3':113 'x':63 'x-payment':62 'x402':11,27,48,143,147 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"d18ffa95-ec94-4967-9b59-93cb9975aba2","listingId":"b5e82b8c-ab1a-4fed-b633-f7d66c8896ca","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/91/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":"2026-04-21T18:32:28.897Z"}],"sources":[{"listingId":"b5e82b8c-ab1a-4fed-b633-f7d66c8896ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/91/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.897Z","lastSeenAt":"2026-04-22T10:03:06.066Z"}],"details":{"listingId":"b5e82b8c-ab1a-4fed-b633-f7d66c8896ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/91/metadata \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/91/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/91/metadata"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment timeout is 300 seconds and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/91/metadata"}],"useCases":["Retrieving metadata for NFT token ID 91 programmatically","Integrating NFT metadata into a dApp or marketplace without API key management","Agent-driven NFT data retrieval with automatic micropayment settlement"],"bestFor":["Developers needing NFT metadata with zero-signup access","AI agents that can settle x402 payments on Base","Applications requiring on-demand NFT data without rate limits"],"notFor":["Bulk retrieval of metadata for large NFT collections (single token ID only)","Users who cannot settle USDC payments on Base network","Free-tier or API-key-based authentication workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.938Z"},"updatedAt":"2026-04-22T10:03:06.066Z"}}