{"id":"ae125643-2a4a-41c0-9b80-ad4ab0a33512","shortId":"undJ6k","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 36 from the lowpaymentfee.com platform. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/nfts/36/metadata` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys are required; payment is handled inline via the X-PAYMENT header. The provider advertises no rate limits and instant access.\n\nDocumentation is minimal — there is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no examples of what the metadata response actually contains. The endpoint is live (returns a proper 402 challenge), but the exact structure of the NFT metadata returned after payment is unknown from available materials. The provider's landing page lists many other endpoints at the same $0.02 price point, but this specific listing covers only the NFT metadata route for token 36.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["nft","web3"],"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 schema documentation available — request and response formats are unknown","Only a single NFT token ID (36) is addressed by this endpoint; generalizability is unclear","Landing page lists many endpoints but provides no detailed docs for any of them","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/36/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/36/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 and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request body schema, no response example, and no documentation beyond a generic landing page. The actual content of the NFT metadata is 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'/request':16,32 '0.02':15,31,118,212 '000':107 '0x8335':112 '20':106 '2913':113 '36':41,227 '402':182 '6':123 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':92 'access':148 'actual':173 'advertis':101,142 'ai/ml':67 'analyt':66 'api':58,126 'avail':198 'base':5,21,85,108,115 'base-network' 'beyond':160 'broader':51 'call':9,25 'challeng':100,183 'contain':174 'cost':104 'cover':219 'data':65 'decim':124 'document':149 'endpoint':3,19,34,74,89,176,208 'equal':117 'exact':186 'exampl':167 'finance/web3':69 'handl':132 'header':139 'id':40 'infer':68 'infrastructur':71 'inlin':133 'instant':147 'json':97 'key':127 'land':203 'limit':145 'list':205,218 'live':178 'lowpaymentfee.com':44 'mani':206 'materi':199 'maximum':103 'metadata':2,18,37,171,191,223 'minim':151 'network':86 'nft':1,17,36,190,222 'nft-metadata' 'no-api-key' 'offer':59 'on-chain metadata' 'openapi':155 'outputschema':163 'page':204 'part':48 'pay':7,23,55 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':54 'payment':78,130,138,194 'per':8,24,56,119 'platform':45 'point':214 'post':93 'price':213 'proper':181 'protocol':79 'provid':63,141,201 'rate':144 'request':57,94,120 'request/response':158 'requir':129 'respons':172 'return':96,179,192 'rout':224 'schema':159 'serv':35 'settl':80 'span':64 'spec':156 'specif':88,217 'structur':187 'stub':164 'suit':52 'token':39,226 'token metadata' 'unit':109 'unknown':196 'usdc':13,29,82,111,121 'usdc-settlement' 'use':75,122 'util':72 'via':10,26,134 'x':137 'x-payment':136 'x402':11,27,77,99,162 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"e35c06f7-c0b2-4ae1-8e9a-0db207034816","listingId":"ae125643-2a4a-41c0-9b80-ad4ab0a33512","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/36/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":"2026-04-21T18:32:28.216Z"}],"sources":[{"listingId":"ae125643-2a4a-41c0-9b80-ad4ab0a33512","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/36/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.216Z","lastSeenAt":"2026-04-22T16:32:58.784Z"}],"details":{"listingId":"ae125643-2a4a-41c0-9b80-ad4ab0a33512","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/36/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/36/metadata"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/36/metadata"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for NFT token #36 from this provider","Integrating NFT metadata lookups into agent workflows with automatic micropayments","Demonstrating x402 payment protocol usage for API access"],"bestFor":["Agents needing NFT metadata with no signup or API key","Developers experimenting with x402 micropayment-gated APIs","Low-volume, on-demand NFT metadata retrieval"],"notFor":["Bulk NFT metadata retrieval across many collections or token IDs","Users who need detailed documentation or response schema guarantees","Querying NFTs outside this specific provider's catalog"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.071Z"},"updatedAt":"2026-04-22T16:32:58.784Z"}}