{"id":"bfbcca97-954c-4384-b587-e47419a1414e","shortId":"7y34mH","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 86 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 API platform at lowpaymentfee.com that offers dozens of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; payment is the only authentication mechanism. The x402 challenge confirms the endpoint is live, accepting the \"exact\" payment scheme with a max amount of 20,000 base units of USDC (6 decimals → $0.02).\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 accepts POST requests and returns application/json. Because the endpoint path includes a specific NFT ID (86), it likely returns metadata (name, description, image, attributes) for that particular token, but this is inferred rather than confirmed.","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 attributes","on-chain metadata","x402 NFT endpoint","USDC micropayment API","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response bodies documented","Endpoint is scoped to a single NFT token ID (86); unclear if other IDs are supported at different paths","The broader platform lists many endpoints but none have detailed docs in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/86/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/86/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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, and no example payloads. The endpoint serves a single hardcoded NFT ID with no documentation on what metadata fields are returned. Effectively a stub 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'0.02':15,31,119,166 '000':159 '0x8335':87 '20':158 '2913':88 '6':164 '86':41,220 'Base network API' 'NFT attributes' 'NFT metadata API' 'USDC micropayment API' 'accept':148,205 'access':133,184 'across':107 'advertis':124 'ai/ml':110 'amount':156 'analyt':109 'api':98,126,183 'application/json':210 'attribut':228 'authent':138 'avail':198 'base':5,21,52,90,160 'base-network' 'beyond':179 'broader':97 'call':9,25 'caller':55 'chain':83 'challeng':142 'confirm':143,239 'contain':66 'content':169 'contract':86 'crawl':201 'data':108 'decim':165 'descript':226 'document':178 'dozen':104 'endpoint':3,19,34,92,106,145,175,204,213 'exact':150 'exampl':196 'finance/web3':112 'generic':181 'header':65 'id':40,219 'imag':227 'includ':215 'infer':111,236 'infrastructur':114 'instant':132 'json':73 'json-response' 'key':127 'label':185 'like':222 'limit':130 'live':147 'lowpaymentfee.com':101 'materi':202 'max':155 'mechan':139 'metadata':2,18,37,74,174,224 'name':225 'network':53 'nft':1,17,36,173,218 'nft-metadata' 'offer':103 'on-chain':81 'on-chain metadata' 'openapi':189 'part':94 'particular':231 'path':214 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-request':44 'payload':197 'payment':64,69,78,134,151 'per':8,24,46,120 'platform':99,123 'post':58,206 'premium':182 'price':117 'proof':70 'protocol':49 'rate':129 'rather':237 'receiv':72 'request':47,59,121,207 'request/response':192 'return':76,170,209,223 'schema':193 'scheme':152 'send':56 'serv':35 'settl':80 'spec':190 'specif':168,217 'token':39,232 'token metadata' 'unit':161 'usdc':13,29,68,85,163 'usdc-settlement' 'use':84 'util':115 'via':10,26,42 'x':63 'x-payment':62 'x402':11,27,48,141 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"c88dbc27-7757-4e27-8389-3e568e339046","listingId":"bfbcca97-954c-4384-b587-e47419a1414e","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/86/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":"2026-04-21T18:32:32.331Z"}],"sources":[{"listingId":"bfbcca97-954c-4384-b587-e47419a1414e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/86/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.331Z","lastSeenAt":"2026-04-22T09:02:25.943Z"}],"details":{"listingId":"bfbcca97-954c-4384-b587-e47419a1414e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/86/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 endpoint returns HTTP 402 with an x402 challenge advertising USDC payment on Base at 20,000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/86/metadata"},{"claim":"The platform prices all endpoints at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/86/metadata"}],"useCases":["Retrieving NFT metadata (name, image, attributes) for token ID 86 programmatically","Demonstrating x402 pay-per-call integration on Base with USDC","Building NFT display UIs that fetch metadata on demand"],"bestFor":["Agents or apps needing NFT metadata with no API key signup","Developers experimenting with x402 micropayment protocol","Low-friction, pay-as-you-go NFT data retrieval"],"notFor":["Bulk retrieval of metadata across many NFT collections (single token ID only)","Use cases requiring free or subscription-based access","Applications needing detailed request/response documentation upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.181Z"},"updatedAt":"2026-04-22T09:02:25.943Z"}}