{"id":"46ebd70e-3096-4211-8f95-6070ceb16836","shortId":"kQKUam","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/60` is listed as \"Premium API Access.\" The x402 challenge confirms it is live and accepts POST requests, requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 examples of what this particular endpoint returns. The landing page lists many sibling endpoints but provides no detail on input parameters or response formats for any of them. Prospective callers should be aware that the actual functionality behind \"Premium API Access\" is undocumented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API access","no-auth API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The purpose and functionality of /api/v1/payments/60 ('Premium API Access') is completely undocumented","Cannot verify what data or service this specific endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/60","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/payments/60","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 USDC on Base), but there is zero documentation on what this endpoint actually does, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The listing name 'Premium API Access' is generic and 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'/api/v1/payments/60':112 '/docs':168 '/pricing':169 '/readme':172 '/request':13,30 '0.02':12,29,70,145 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':139 '20':133 '2913':140 '300':160 '6':149 'Base network API' 'USDC API' 'accept':127 'access':118,236 'account':88 'across':54 'actual':231 'address':156 'advertis':93 'ai':59 'ai-inference' 'analyt':58 'api':5,15,22,32,41,86,117,235 'attach':96 'awar':228 'base':8,25,75,135,142 'behind':233 'broad':46 'call':4,21,68 'caller':94,225 'catalog':47 'categori':56 'challeng':121 'classification' 'confirm':122 'connect':178 'content':184 'conversion' 'cost':69 'crypto API access' 'crypto-quotes' 'data':57 'data-analytics' 'decim':150 'detail':213 'direct':154 'document':163,193 'embeddings' 'enabl':40 'endpoint':53,110,201,209 'equal':144 'exact':82 'exact-pay':81 'exampl':196 'extrem':165 'financ':62 'finance-data' 'format':219 'four':55 'function':232 'geocoding' 'given':146 'header':101 'infrastructur':65 'input':215 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'x402-payment'","prices":[{"id":"ec31e3b2-2459-4c2f-bde1-93ecbf609d06","listingId":"46ebd70e-3096-4211-8f95-6070ceb16836","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/payments/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:58.116Z"}],"sources":[{"listingId":"46ebd70e-3096-4211-8f95-6070ceb16836","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:58.116Z","lastSeenAt":"2026-04-23T02:01:20.475Z"}],"details":{"listingId":"46ebd70e-3096-4211-8f95-6070ceb16836","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/60 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/60"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/60"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for AI inference tasks like sentiment analysis or text summarization","Fetching real-time crypto quotes or gas estimates with micropayments","Geocoding or data validation without subscription commitments"],"bestFor":["AI agents that need frictionless, keyless API access via x402","Developers prototyping with low-cost pay-per-use endpoints","Web3-native applications already operating on Base network"],"notFor":["High-volume production workloads needing guaranteed SLAs and documented schemas","Users who need detailed API documentation and response format guarantees","Callers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.548Z"},"updatedAt":"2026-04-23T02:01:20.475Z"}}