{"id":"f2620d9b-ed09-4d77-9d40-5a1f71611168","shortId":"QL3YSG","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 22 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 is settled on-chain using USDC (contract 0x8335…2913) on Base.\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 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 specific resource at `/api/v1/nfts/22/metadata` returns NFT metadata as application/json. The x402 challenge specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02. The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No OpenAPI schema or detailed documentation for the response body was found beyond the MIME type declaration.","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 info endpoint","on-chain metadata","x402 NFT","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or response schema available — the shape of the returned NFT metadata is unknown.","Endpoint is scoped to a single NFT token ID (22); unclear if other token IDs are available at similar paths.","No documentation pages were accessible (pricing, README, and API pages all returned only 'Connect wallet').","The broader platform lists many API categories but none were verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/22/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/22/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). However, there is no OpenAPI schema, no documented request body format, no example response, and the endpoint serves metadata for a single hardcoded NFT token ID. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':16,32 '0.02':15,31,122,174 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':179 '0x8335':87 '20000':165 '22':41 '2913':88 '6':170 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'access':136 'advertis':127 'ai/ml':112 'analyt':111 'api':108,129 'application/json':157 'authent':137 'base':5,21,52,90,166 'base-network' 'beyond':192 'bill':139 'bodi':189 'broader':97 'call':9,25 'caller':55 'chain':83 'challeng':147,160 'contain':66 'contract':86 'data':110,115 'decim':171 'declar':196 'detail':184 'document':185 'dozen':103 'endpoint':3,19,34,92 'entir':142 'equal':173 'finance/web3':114 'found':191 'gate':107 'handl':141 'header':65 'id':40 'infer':113 'instant':135 'json':73 'json-response' 'key':130 'limit':133 'lowpaymentfee.com':100 'maxamountrequir':163 'metadata':2,18,37,74,155 'mime':194 'network':53 'nft':1,17,36,154 'nft-metadata' 'offer':102 'on-chain':81 'on-chain metadata' 'openapi':181 'part':94 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':64,69,78,146,176 'per':8,24,46,123 'platform':98,126 'post':58 'price':120 'proof':70 'protocol':49 'rate':132 'receiv':72 'recipi':177 'request':47,59,124 'resourc':150 'respons':188 'return':76,153 'schema':182 'send':56 'serv':35 'servic':118 'settl':80 'span':109 'specif':149 'specifi':161 'token':39 'token metadata' 'type':195 'unit':167 'usdc':13,29,68,85,169 'usdc-settlement' 'use':84 'util':117 'via':10,26,42 'x':63 'x-payment':62 'x402':11,27,48,106,145,159 'x402 NFT' 'x402-gated':105 'x402-payment'","prices":[{"id":"27194daf-c457-4ab0-9b91-8758c7f357ff","listingId":"f2620d9b-ed09-4d77-9d40-5a1f71611168","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/22/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":"2026-04-21T18:32:27.902Z"}],"sources":[{"listingId":"f2620d9b-ed09-4d77-9d40-5a1f71611168","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/22/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.902Z","lastSeenAt":"2026-04-22T18:05:10.960Z"}],"details":{"listingId":"f2620d9b-ed09-4d77-9d40-5a1f71611168","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/22/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/22/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/22/metadata"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/22/metadata"}],"useCases":["Retrieving metadata for NFT token #22 programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT data lookup with automatic micropayment"],"bestFor":["Agents or apps that need on-demand NFT metadata without API key management","Developers testing x402 payment flows on Base","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["Bulk retrieval of metadata across many NFT collections (single token ID only)","Users who need free or subscription-based access without per-call crypto payments","Querying NFT metadata on networks other than Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.662Z"},"updatedAt":"2026-04-22T18:05:10.960Z"}}