{"id":"b748f3b6-f408-4144-aa13-aca3deee9649","shortId":"6hqtjj","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform uses the x402 payment protocol, meaning no API keys, accounts, or rate limits are required — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/130` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior, input/output schemas, and data sources for each endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto payment api"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) return no useful content — just 'Connect wallet'","No OpenAPI or schema available; input parameters and response format for this endpoint are unknown","The endpoint path '/api/v1/charges/130' with description 'Premium API Access' does not match any of the advertised API categories on the landing page — its actual function is unclear","No information about data sources, model providers, or accuracy guarantees for any of the advertised capabilities"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/130","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/charges/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, and the landing page lists available APIs with pricing. However, all documentation pages are empty ('Connect wallet' only), there is no OpenAPI schema, no input/output examples, and the actual functionality of '/api/v1/charges/130' ('Premium API Access') is completely undocumented. The listing is effectively a stub with pricing 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Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:15.211Z"}],"sources":[{"listingId":"b748f3b6-f408-4144-aa13-aca3deee9649","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/130","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:15.211Z","lastSeenAt":"2026-04-23T11:03:19.702Z"}],"details":{"listingId":"b748f3b6-f408-4144-aa13-aca3deee9649","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/130 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/130"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates via micropayment","Geocoding or data validation as a utility service with per-call billing","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-commitment, no-signup API access","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.966Z"},"updatedAt":"2026-04-23T11:03:19.702Z"}}