{"id":"e3fce81b-1a66-4776-9fdd-95653d71d7c4","shortId":"udwCD6","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/68` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource `/api/v1/nfts/68` is labeled \"Premium API Access\" and returns JSON content. It accepts POST requests and settles payments on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe x402 challenge advertises a `maxAmountRequired` of 20,000 base units. USDC uses 6 decimals, so the per-request cost is $0.02 — consistent with the site-wide flat pricing of $0.02 per request. No API keys are required; payment is handled entirely via the x402 `X-PAYMENT` header. The platform advertises no rate limits and instant access.\n\nThe exact data returned by `/api/v1/nfts/68` 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 crawl. The endpoint is confirmed live (402 challenge captured), but the lack of documentation about what NFT data is returned (metadata, ownership, pricing, etc.) makes it difficult to evaluate the endpoint's utility without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT API","NFT metadata endpoint","pay-per-call NFT data","x402 NFT","USDC micropayment API","lowpaymentfee NFT","Base network API"],"warnings":["No documentation exists for what /api/v1/nfts/68 actually returns — the label 'Premium API Access' is generic and uninformative.","No OpenAPI spec, request schema, or response schema is available.","The broader lowpaymentfee.com platform lists many endpoints but none have detailed docs in the crawl.","The NFT-specific functionality (metadata, ownership, pricing, etc.) is entirely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what data the NFT endpoint actually returns. The listing is effectively a stub with confirmed 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'0.02':10,24,109,119 '000':95 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':86 '20':94 '402':184 '6':100 'Base network API' 'NFT API' 'NFT metadata endpoint' 'USDC micropayment API' 'accept':73 'access':67,146,161 'advertis':90,140 'ai/ml':53 'analyt':52 'api':49,66,123,160 'avail':175 'base':8,22,81,96 'base-network' 'beyond':156 'call':48 'captur':186 'challeng':89,185 'collect':40 'confirm':182 'consist':110 'content':71 'contract':85 'cost':107 'crawl':178 'data':5,19,51,149,195 'decim':101 'difficult':204 'document':155,191 'endpoint':6,20,30,180,208 'entir':130 'etc':201 'evalu':206 'exact':148 'exampl':173 'experiment':212 'finance/web3':55 'flat':116 'gate':3,17 'generic':158 'handl':129 'header':137 'infer':54 'infrastructur':57 'instant':145 'json':70 'json-response' 'key':124 'label':64,162 'lack':189 'limit':143 'live':183 'lowpaymentfee NFT' 'lowpaymentfee.com':37 'make':202 'maxamountrequir':92 'metadata':198 'network':82 'nft':4,18,194 'nft-data' 'no-api-key' 'openapi':166 'ownership':199 'part':34 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT data' 'pay-per-request' 'payload':174 'payment':78,127,136 'per':11,25,47,105,120 'per-request':104 'platform':38,139 'post':74 'premium':65,159 'price':117,200 'protocol':44 'rate':142 'request':12,26,75,106,121 'request/response':169 'requir':126 'resourc':61 'return':69,150,197 'schema':170 'settl':77 'site':114 'site-wid':113 'span':50 'spec':167 'specif':60 'unit':97 'usdc':14,28,84,98 'usdc-settlement' 'use':83,99 'util':58,210 'via':131 'wide':115 'without':211 'x':135 'x-payment':134 'x402':2,16,43,88,133 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"153e3206-1ed4-49f1-bc3e-ec9de4b9430b","listingId":"e3fce81b-1a66-4776-9fdd-95653d71d7c4","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.561Z"}],"sources":[{"listingId":"e3fce81b-1a66-4776-9fdd-95653d71d7c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.561Z","lastSeenAt":"2026-04-22T13:32:33.819Z"}],"details":{"listingId":"e3fce81b-1a66-4776-9fdd-95653d71d7c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/68 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/68"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/68"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/nfts/68"}],"useCases":["Fetching NFT data or metadata for a specific token (ID 68) on demand","Agent-driven NFT lookups without managing API keys","Programmatic access to NFT information with per-call USDC micropayments"],"bestFor":["Agents or bots that need keyless, pay-as-you-go NFT data access","Developers prototyping NFT integrations without subscription commitments","x402-compatible wallets and agent frameworks on Base"],"notFor":["Bulk NFT data ingestion requiring thousands of calls (no documented batch endpoint)","Users who need detailed documentation or guaranteed response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.546Z"},"updatedAt":"2026-04-22T13:32:33.819Z"}}