{"id":"b5e97fae-4c21-4c8d-b7e6-bd78c3b46be9","shortId":"pmZPTy","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/products/15` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The site advertises categories including 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 utilities (geocoding, validation, conversion, generation).\n\nThe probed endpoint requires a maximum payment of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints with no API keys, no rate limits, and no minimum commitments. Payment is made via the x402 `exact` scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what data or functionality the \"Premium API Access\" product specifically returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only a wallet-connect prompt","No OpenAPI or JSON schema describing request parameters or response format for this endpoint","It is unclear what 'Premium API Access' at /api/v1/products/15 specifically returns — the name is generic","The site lists many endpoint categories but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/15","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/products/15","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 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet' with no schemas, examples, or descriptions of what the endpoint actually returns. The specific product at /products/15 has no documented input/output 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'/api/v1/products/15':65 '/docs':183 '/pricing':185 '/readme':187 '/request':17,34,151 '0.02':16,33,139,150 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x8335':133 '20':126 '2913':134 '402':224 '402 payment api' '6':144 'accept':72 'access':70,243 'across':153 'advertis':82,148 'ai':10,27,92 'ai-inference' 'analysi':96 'analyt':86 'api':4,21,41,69,158,242 'avail':214 'base':7,24,59,128,136 'base network api' 'behind':49 'categori':83 'challeng':79,229 'classif':99 'classification' 'commit':166 'confirm':221 'connect':193 'contract':132 'convers':116 'crawl':217 'data':9,26,85,89,237 'data-analytics' 'decim':145 'detail':200 'document':178,209,232 'embed':100 'embeddings' 'endpoint':14,31,48,63,120,155,219 'equal':138 'estim':110 'exact':173 'exampl':213 'exchang':105 'export':90 'extrem':180 'feed':104 'financ':11,28,101 'finance-data' 'function':239 'gas':109 'gate':3,20,44 'generat':117 'geocod':114 'geocoding' 'includ':84 'infrastructur':112 'insight':91 'key':159 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'x402':2,19,39,77,172,228 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ad90a40f-a542-4868-8f2a-4be9d9e1c3cf","listingId":"b5e97fae-4c21-4c8d-b7e6-bd78c3b46be9","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/products/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:07.666Z"}],"sources":[{"listingId":"b5e97fae-4c21-4c8d-b7e6-bd78c3b46be9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:07.666Z","lastSeenAt":"2026-04-22T23:00:57.138Z"}],"details":{"listingId":"b5e97fae-4c21-4c8d-b7e6-bd78c3b46be9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/15 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/15"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/15"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayment","Running utility operations like geocoding, validation, and data conversion on a pay-per-use basis","Integrating agent-purchasable API calls into autonomous workflows using x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 micropayments on Base","Projects needing low-cost, commitment-free access to diverse API categories"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.77Z"},"updatedAt":"2026-04-22T23:00:57.138Z"}}