{"id":"b12a4e24-fe0d-4252-b264-4f8e8ea6e8e5","shortId":"f9jJns","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 payment challenge is live and returns a standard 402 response advertising the payment terms.\n\nThe specific endpoint at `/api/v1/generate/resource/102` is listed under \"Premium API Access.\" The probe confirms it accepts POST requests and settles payment via USDC (contract 0x8335…2913) on Base. The maxAmountRequired of 20000 base units (USDC has 6 decimals) translates to $0.02 per call, consistent with the site's advertised flat pricing. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and output of this specific resource endpoint (resource/102) is unknown beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no content.","No OpenAPI or schema definition found; request and response formats for resource/102 are unknown.","The purpose and output of '/api/v1/generate/resource/102' (labeled 'Premium API Access') is not described anywhere in the crawled material.","This endpoint does not appear in the site's own listed API catalog, which raises questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/102","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/generate/resource/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality of resource/102 is completely undocumented. The docs pages are empty beyond a wallet-connect 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'/api/v1/generate/resource/102':101 '/docs':182 '/pricing':183 '/readme':186 '/request':13,28 '0.02':12,27,60,137,174 '0x8335':121 '20000':128 '2913':122 '402':91 '6':133 'Base network API' 'USDC micropayment API' 'accept':112 'access':7,22,107 'actual':217 'advertis':93,145 'ai':49 'also':150 'analysi':155 'analyt':48 'api':6,21,37,72,106 'avail':212 'base':9,24,68,124,129 'base-network' 'behavior':218 'beyond':229 'broad':42 'call':4,19,139 'challeng':84,232 'classif':158 'commit':79 'confirm':110 'connect':192 'consist':140 'content':198 'contract':120 'convers':166 'cost':59 'crawl':215 'crypto-paid API' 'data':47,168 'decim':134 'document':177,207 'embed':159 'enabl':36 'endpoint':45,58,99,152,225 'exampl':211 'exchang':162 'export':169 'extrem':179 'feed':161 'financ':52 'flat':146 'geocod':164 'host':151 'infrastructur':55 'json-response' 'key':73 'learn':51 'limit':76 'list':103 'live':86 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':50 'maxamountrequir':126 'metadata':233 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'x402-payment'","prices":[{"id":"a5b26d4a-10c5-4a11-bc4a-3714ffc21d17","listingId":"b12a4e24-fe0d-4252-b264-4f8e8ea6e8e5","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/generate/resource/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:07.731Z"}],"sources":[{"listingId":"b12a4e24-fe0d-4252-b264-4f8e8ea6e8e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:07.731Z","lastSeenAt":"2026-04-24T11:31:44.047Z"}],"details":{"listingId":"b12a4e24-fe0d-4252-b264-4f8e8ea6e8e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/102 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/102"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating low-friction paid endpoints without subscription management"],"bestFor":["Developers wanting zero-commitment, per-request API billing","AI agents that can settle x402 payments autonomously on Base","Projects needing instant API access without signup or API key provisioning"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.833Z"},"updatedAt":"2026-04-24T11:31:44.047Z"}}