{"id":"62cfec31-7968-465a-b517-805e60275f49","shortId":"XRcn3V","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint `/api/v1/nfts/61` is listed as \"Premium API Access\" and is gated via the x402 protocol on the Base network. Payment is settled in USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). The platform advertises no API keys, no rate limits, and instant access.\n\nThe platform hosts multiple endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints appear to share the same $0.02/request pricing model.\n\nHowever, the specific functionality of `/api/v1/nfts/61` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live via a valid 402 challenge, but what data or service it actually returns when paid is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","nft-data"],"categories":["web3","data"],"synonyms":["NFT API","premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation exists for the /api/v1/nfts/61 endpoint beyond the generic label 'Premium API Access'","No OpenAPI or schema available — request body and response format are completely unknown","The /api, /pricing, and /README pages returned no useful content (just 'Connect wallet')","The 'nft' path segment suggests NFT-related data but this is inferred, not confirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/61","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/61","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 with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation on what /api/v1/nfts/61 actually returns, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific endpoint purpose is essentially 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'/request':163 '0.02':10,28,95,162 '000':99 '0x8335':89 '20':98 '2913':90 '402':207 '6':103 'Base network API' 'NFT API' 'USDC micropayment API' 'access':6,24,71,116,180 'across':53 'actual':215 'advertis':107 'ai':130 'ai/ml':56 'analysi':134 'analyt':55,124 'api':5,16,23,34,52,70,109,179 'appear':157 'avail':194,223 'base':8,26,81,100 'base-network' 'beyond':175 'broader':45 'categori':122 'challeng':208 'classif':137 'confirm':202 'contract':88 'convers':153 'cost':93 'crawl':197 'data':54,123,127,211 'decim':104 'detail':192 'document':174,193 'embed':138 'endpoint':38,64,121,156,200 'estim':148 'exampl':189 'exchang':143 'export':128 'feed':142 'financ':139 'finance/web3':58 'function':169 'gas':147 'gate':3,21,74 'generat':154 'generic':177 'geocod':151 'host':119 'howev':166 'infer':57 'infrastructur':60,150 'insight':129 'instant':115 'key':17,35,110 'label':181 'learn':132 'limit':113 'list':67 'live':203 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':131 'materi':224 'metric':125 'model':165 'multipl':120 'network':82 'nft-data' 'no-api-key' 'offer':47 'openapi':185 'page':198 'paid':218 'part':42 'pay':9,27,49 'pay-per-call API' 'pay-per-request':48 'payment':83 'per':11,29,50,96 'platform':46,106,118 'premium':4,22,69,178 'premium API' 'price':141,164 'protocol':78 'quot':146 'rate':112,144 'report':126 'request':12,30,51,97 'request/response':188 'requir':18,36 'return':216 'schema':186 'sentiment':133 'servic':213 'settl':85 'share':159 'specif':63,168 'summar':136 'text':135 'token':145 'unit':101 'unknown':220 'usdc':14,32,87 'usdc-settlement' 'util':61 'valid':152,206 'via':75,204 'web3':140 'x402':2,20,77 'x402 endpoint' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"2404497f-b372-49e4-b741-4784e07b082f","listingId":"62cfec31-7968-465a-b517-805e60275f49","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.710Z"}],"sources":[{"listingId":"62cfec31-7968-465a-b517-805e60275f49","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.710Z","lastSeenAt":"2026-04-22T04:02:47.226Z"}],"details":{"listingId":"62cfec31-7968-465a-b517-805e60275f49","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/61 \\\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 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/61"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/61"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing NFT-related data or metadata via a single paid request","Agent-driven API consumption without pre-registration or API key management","Micropayment-gated data retrieval on Base L2"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","Web3-native applications that can settle USDC on Base","Scenarios requiring low-friction, no-commitment API calls"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up versus subscription models","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.593Z"},"updatedAt":"2026-04-22T04:02:47.226Z"}}