Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/payments/145` is listed as "Premium API Access" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made by including an X-PAYMENT header; no API keys or account registration are required. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json.
Documentation 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 crawled material. The exact functionality behind the "Premium API Access" label at this specific path (`/payments/145`) is unclear, as it does not map to any of the named endpoints listed on the homepage.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys
- —Fetching real-time financial data like token quotes, exchange rates, and gas estimates
- —Running utility operations like geocoding, validation, and data conversion on a per-call basis
- —Integrating pay-per-request data analytics into agent workflows
Fit
Best for
- —Agents or developers who want zero-signup, pay-per-call API access
- —Prototyping workflows that need cheap, on-demand AI or data endpoints
- —Web3-native applications that can settle micropayments in USDC on Base
Not for
- —High-volume production workloads needing guaranteed SLAs and detailed documentation
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/145 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but documentation is essentially nonexistent — all doc pages return only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and the specific purpose of /api/v1/payments/145 ('Premium API Access') is not explained anywhere. The listing is effectively a stub.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) contain no usable content — only a 'Connect wallet' prompt.
- —No OpenAPI or schema documentation is available for any endpoint.
- —The specific endpoint /api/v1/payments/145 labeled 'Premium API Access' does not correspond to any named endpoint on the homepage; its exact functionality is unknown.
- —No request or response examples are available from crawled material.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/payments/145 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/payments/145
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no further content.https://lowpaymentfee.com/docs