Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/trades/128` is listed as "Premium API Access" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
Documentation beyond the landing page 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 examples of what the `/api/v1/trades/128` endpoint actually returns. The endpoint name suggests trade-related data (possibly a specific trade record), but this is speculative based solely on the URL path.
Capabilities
Use cases
- —Fetching trade data or records on a per-call basis without subscription
- —Agent-driven programmatic access to premium API endpoints with crypto micropayments
- —Integrating pay-as-you-go data retrieval into Web3 workflows
Fit
Best for
- —Developers wanting no-signup, no-API-key access to premium endpoints
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer per-request pricing over monthly subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/128 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality of /api/v1/trades/128 is unclear — the description is just 'Premium API Access' with no detail on what data it returns or what inputs it expects.
Warnings
- —No OpenAPI spec or schema documentation available
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific purpose of /api/v1/trades/128 is unknown — 'Premium API Access' is generic
- —No request body schema or response schema documented anywhere
- —Cannot verify what data this endpoint actually returns without making a paid request
Citations
- —Uniform pricing of $0.02 per request across all endpointshttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base network settlementhttps://lowpaymentfee.com
- —x402 challenge with maxAmountRequired of 20000 base units USDC on Base, 300s timeouthttps://lowpaymentfee.com/api/v1/trades/128
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/trades/128