{"id":"c8e91eae-d7a3-4190-9f7f-9de9a60bb38f","shortId":"eHCLBV","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 65 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nThe provider's landing page advertises a broad suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. This specific endpoint falls under an NFT metadata category (path: /api/v1/nfts/65/metadata). The response MIME type is application/json. Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nNote that the actual content returned by this endpoint is not documented beyond the generic \"Premium API Access\" description. There is no OpenAPI schema, no example response, and no detailed documentation available from the crawled pages. The provider site mostly shows a wallet-connect interface with minimal technical docs.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","x402 NFT endpoint","pay-per-request API","Base USDC API","lowpaymentfee","NFT token info"],"warnings":["No OpenAPI or response schema available — actual response format is unknown","Only token ID 65 is addressed by this specific endpoint; generalizability unclear","Provider documentation pages (pricing, README, api) all resolve to a wallet-connect page with no technical content","No example responses or field descriptions available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/65/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/65/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), but there is no OpenAPI schema, no example request/response, and no documentation beyond a generic label. The actual data returned is unknown, making this effectively a stub 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'/request':16,32 '0.02':15,31,57,73,128 '000':67 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':157 '20':66 '6':71 '65':43 'Base USDC API' 'NFT metadata API' 'NFT token info' 'access':98,177 'account':77 'actual':163 'address':152 'advertis':106 'ai/ml':119 'analyt':118 'api':75,115,176 'application/json':147 'attach':85 'avail':191 'base':5,21,62,68,159 'beyond':172 'broad':108 'call':9,25,55,114 'caller':83 'categori':139 'connect':204 'content':164 'contract':156 'cost':56 'crawl':194 'data':117 'decim':72 'descript':178 'detail':189 'doc':209 'document':171,190 'endpoint':3,19,34,133,168 'exampl':185 'fall':134 'finance/web3':121 'gate':48 'generic':174 'header':90 'id':42 'infer':120 'infrastructur':123 'interfac':205 'json-response' 'key':76 'land':104 'limit':80 'lowpaymentfee' 'lowpaymentfee.com':36 'maxamountrequir':64 'metadata':2,18,39,138 'mime':144 'minim':207 'most':199 'network':63 'nft':1,17,38,137 'nft-metadata' 'no-api-key' 'note':160 'openapi':182 'page':105,195 'path':140 'pay':7,23,112 'pay-per-cal':6,22,111 'pay-per-call' 'pay-per-request API' 'payment':52,89,95,148 'per':8,24,113,129 'post':46 'premium':175 'price':126 'proof':96 'protocol':53 'provid':102,197 'rate':79 'request':47,130 'requir':82 'resourc':100 'respons':143,186 'return':165 'schema':183 'serv':37 'settl':150 'show':200 'simpli':84 'site':198 'span':116 'specif':132 'suit':109 'technic':208 'token':41 'token metadata' 'type':145 'unit':69 'usdc':13,29,59,155 'usdc-base' 'use':154 'util':124 'valid':93 'via':10,26,44 'wallet':203 'wallet-connect':202 'x':88 'x-payment':87 'x402':11,27,51,94 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"557e7399-b331-4578-9073-e7c7661707f9","listingId":"c8e91eae-d7a3-4190-9f7f-9de9a60bb38f","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/65/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":"2026-04-21T18:32:28.650Z"}],"sources":[{"listingId":"c8e91eae-d7a3-4190-9f7f-9de9a60bb38f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/65/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.650Z","lastSeenAt":"2026-04-22T13:32:33.930Z"}],"details":{"listingId":"c8e91eae-d7a3-4190-9f7f-9de9a60bb38f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/65/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 maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/nfts/65/metadata"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/65/metadata"}],"useCases":["Retrieving on-chain NFT metadata for token ID 65 without needing an API key","Programmatic access to NFT data with micropayment settlement on Base","Agent-driven NFT metadata lookups using x402 payment protocol"],"bestFor":["Agents or apps that need NFT metadata with no account setup","Developers testing x402 payment flows on Base","Low-friction, pay-as-you-go NFT data access"],"notFor":["Bulk NFT metadata retrieval across many token IDs (only token 65 is documented at this path)","Users who need detailed API documentation or response schemas before integrating","Free-tier or subscription-based API consumers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.307Z"},"updatedAt":"2026-04-22T13:32:33.930Z"}}