{"id":"a8791e22-22af-4efc-9151-63196cef5d60","shortId":"PMZJLx","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 38 via a POST request, gated behind the x402 payment protocol. It accepts USDC payments on the Base network at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. The platform advertises no rate limits, no minimums, and instant access. Payments settle on the Base L2 network to a specified wallet address using the canonical USDC contract (0x8335…2913).\n\nThe specific resource at `/api/v1/nfts/38/metadata` returns JSON (mimeType: application/json). However, the exact schema of the returned NFT metadata is not documented — there is no OpenAPI spec, no example responses, and the crawled documentation pages beyond the landing page are essentially empty (requiring wallet connection). The endpoint is confirmed live via a 402 challenge response, but the actual content and utility of the metadata payload remain unknown.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-base","pay-per-call","no-api-key"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response payload structure for NFT metadata is unknown — no examples provided","Only token ID 38 is referenced at this path; unclear if other token IDs are supported via different paths","Most documentation pages on the site require wallet connection and returned no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/38/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/38/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 example request/response, and the crawled docs are nearly empty beyond a landing page listing. The specific NFT metadata content is completely undocumented, making this effectively a stub 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'/request':16,32 '0.02':15,31,66,136 '000':70 '0x8335':167 '20':69 '2913':168 '38':43 '402':220 '6':76 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':55 'access':100,149 'account':82 'actual':225 'address':161 'advertis':141 'ai/ml':125 'analyt':124 'api':79,121 'application/json':177 'attach':87 'base':5,21,60,71,154 'behind':49 'beyond':203 'broader':109 'call':9,25,120 'caller':85 'canon':164 'challeng':221 'confirm':216 'connect':212 'content':226 'contract':166 'cost':64 'crawl':200 'data':123,128 'decim':77 'document':189,201 'empti':209 'endpoint':3,19,34,104,214 'essenti':208 'exact':180 'exampl':196 'finance/web3':127 'gate':48 'header':92 'howev':178 'id':42 'infer':126 'instant':148 'json':175 'key':80 'l2':155 'land':205 'limit':144 'live':217 'lowpaymentfee.com':36,111 'metadata':2,18,39,186,231 'mimetyp':176 'minimum':146 'network':61,156 'nft':1,17,38,185 'nft-metadata' 'no-api-key' 'offer':113 'openapi':193 'page':202,206 'part':106 'pay':7,23,118 'pay-per-cal':6,22,117 'pay-per-call' 'pay-per-request NFT' 'payload':232 'payment':52,57,91,97,150 'per':8,24,67,119,137 'platform':110,140 'post':46 'price':133 'proof':98 'protocol':53 'rate':143 'remain':233 'request':47,68,138 'requir':84,210 'resourc':102,171 'respons':197,222 'return':174,184 'schema':181 'serv':37 'servic':131 'settl':151 'simpli':86 'span':122 'spec':194 'specif':170 'specifi':159 'token':41 'token metadata' 'uniform':134 'unit':72 'unknown':234 'usdc':13,29,56,74,165 'usdc-base' 'use':162 'util':130,228 'valid':95 'varieti':115 'via':10,26,44,218 'wallet':160,211 'x':90 'x-payment':89 'x402':11,27,51,96 'x402 NFT' 'x402-payment'","prices":[{"id":"31ab5d3f-1115-49a2-a1db-f3e9ee35ab81","listingId":"a8791e22-22af-4efc-9151-63196cef5d60","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/38/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":"2026-04-21T18:32:33.089Z"}],"sources":[{"listingId":"a8791e22-22af-4efc-9151-63196cef5d60","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/38/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.089Z","lastSeenAt":"2026-04-22T04:02:47.673Z"}],"details":{"listingId":"a8791e22-22af-4efc-9151-63196cef5d60","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/38/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at 20,000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/38/metadata"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/38/metadata"}],"useCases":["Retrieving on-chain NFT metadata for token ID 38 without needing an API key","Programmatic access to NFT data with micropayment settlement on Base","Agent-driven NFT metadata lookups with automatic x402 payment"],"bestFor":["Agents or bots that need NFT metadata with zero-setup authentication","Developers experimenting with x402 pay-per-call patterns on Base","Quick one-off NFT metadata lookups without account creation"],"notFor":["Bulk NFT metadata retrieval across many token IDs (only token 38 is documented at this path)","Users who need detailed documentation or response schema guarantees before integrating","Free-tier or non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.756Z"},"updatedAt":"2026-04-22T04:02:47.673Z"}}