{"id":"0160bb0e-ad86-41fa-b581-7aba413ad362","shortId":"uj79PM","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 59 via a pay-per-request x402 protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum cost of $0.02 per call (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens 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 specific endpoint at /api/v1/nfts/59/metadata appears to return metadata for a particular NFT, though the exact schema of the response body is not documented. The platform advertises no minimums, no commitments, and instant access.\n\nBecause there is no OpenAPI spec, no response schema documentation, and no example responses available, the actual structure and content of the returned NFT metadata is unknown. Callers should expect a JSON object but will need to discover the fields empirically. The x402 challenge was successfully captured (HTTP 402 with valid accepts array), confirming the endpoint is live.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"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 response schema available — response structure must be discovered empirically","Endpoint is scoped to a single NFT (token ID 59); unclear if other token IDs are available at similar paths","No documentation beyond the homepage listing; /api, /pricing, and /README pages all just show 'Connect wallet'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/59/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/59/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 well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no example responses, and no documentation beyond the landing page listing. The specific NFT metadata content is entirely 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'/request':16,32 '0.02':15,31,75,140 '000':79 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':78 '402':225 '59':41 '6':83 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':55,228 'access':176 'actual':193 'advertis':169 'ai/ml':129 'analyt':128 'api':86,125 'appear':148 'array':229 'attach':95 'avail':191 'base':5,21,52,69,80 'base-network' 'bodi':163 'broader':113 'call':9,25,77,124 'caller':93,204 'captur':223 'challeng':220 'commit':173 'confirm':230 'content':196 'contract':66 'cost':73 'data':127,132 'decim':84 'discov':214 'document':166,186 'dozen':119 'empir':217 'endpoint':3,19,34,108,145,232 'exact':158 'exampl':189 'expect':206 'field':216 'finance/web3':131 'header':100 'http':224 'id':40 'infer':130 'instant':175 'json':60,208 'json-response' 'key':87 'limit':90 'live':234 'lowpaymentfee.com':116 'maximum':72 'metadata':2,18,37,151,201 'minimum':171 'need':212 'network':53 'nft':1,17,36,155,200 'nft-metadata' 'no-api-key' 'object':209 'offer':118 'on-chain metadata' 'openapi':181 'part':110 'particular':154 'pay':7,23,45,122 'pay-per-cal':6,22,121 'pay-per-call NFT' 'pay-per-request':44 'payment':61,99,105 'per':8,24,46,76,123,141 'platform':114,168 'post':56 'price':137 'proof':106 'protocol':49 'rate':89 'request':47,57,142 'requir':92 'respons':162,184,190 'return':59,150,199 'schema':159,185 'serv':35 'servic':135 'settl':63 'simpli':94 'span':126 'spec':182 'specif':144 'structur':194 'success':222 'though':156 'token':39 'token metadata' 'uniform':138 'unit':81 'unknown':203 'usdc':13,29,65 'usdc-settlement' 'util':134 'valid':103,227 'via':10,26,42 'x':98 'x-payment':97 'x402':11,27,48,104,219 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"1fa184d8-c6f2-4eed-8a06-7f2f5775d03f","listingId":"0160bb0e-ad86-41fa-b581-7aba413ad362","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/59/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":"2026-04-21T18:32:28.531Z"}],"sources":[{"listingId":"0160bb0e-ad86-41fa-b581-7aba413ad362","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/59/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.531Z","lastSeenAt":"2026-04-22T13:32:33.786Z"}],"details":{"listingId":"0160bb0e-ad86-41fa-b581-7aba413ad362","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/59/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 x402 challenge advertising USDC payment on Base at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/59/metadata"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/59/metadata"}],"useCases":["Retrieving metadata for NFT token 59 from this provider","Integrating NFT display data into a dApp or marketplace UI","Agent-driven NFT data lookup with micropayment settlement"],"bestFor":["Developers needing quick, keyless access to specific NFT metadata","Agents that can settle x402 payments in USDC on Base","Low-volume or sporadic NFT metadata lookups without subscription overhead"],"notFor":["Bulk retrieval of metadata across many NFT collections (only serves token 59)","Users who need free or pre-authenticated NFT metadata (e.g., direct on-chain tokenURI calls)","Applications requiring documented, stable response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.549Z"},"updatedAt":"2026-04-22T13:32:33.786Z"}}