{"id":"34921609-fd94-4fc0-86e9-9bebd5407981","shortId":"qGEtEs","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/63` is listed as \"Premium API Access\" and requires up to $0.02 in USDC (maxAmountRequired of 20,000 base units with 6 decimals) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no sign-up required.\n\nThe broader platform advertises four categories of APIs: 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). All endpoints are listed at the same $0.02/request price point and settle payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 specific functionality behind the `/api/v1/stripe/charges/63` path is unclear; the name suggests it may relate to Stripe charge data or a proxy for Stripe payment operations, but this is unconfirmed.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","low payment fee API","crypto-gated API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/stripe/charges/63 ('Premium API Access') is unclear and may differ from the other listed endpoints","No request body schema or response format is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/63","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/stripe/charges/63","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 no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (/api/v1/stripe/charges/63) is ambiguous. All doc pages return only 'Connect wallet' with no 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'x402':2,21,43,99 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"cea99550-53f8-490b-b95b-fa06ee91407f","listingId":"34921609-fd94-4fc0-86e9-9bebd5407981","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/stripe/charges/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:29.458Z"}],"sources":[{"listingId":"34921609-fd94-4fc0-86e9-9bebd5407981","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:29.458Z","lastSeenAt":"2026-04-22T18:32:10.233Z"}],"details":{"listingId":"34921609-fd94-4fc0-86e9-9bebd5407981","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/63 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/63"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/63"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reporting endpoints without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a pay-per-call basis","Fetching real-time financial data such as exchange rates, token quotes, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant access"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","Agents and bots that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-crypto payment methods or fiat-only billing","High-volume production workloads where per-request crypto settlement overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.374Z"},"updatedAt":"2026-04-22T18:32:10.233Z"}}