x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/endpoint-25` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The endpoint is labeled "Premium API Access" and accepts POST requests, returning application/json responses. Payment is handled via the x402 exact scheme on the Base network using USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).
The specific functionality of `/api/endpoint-25` is unclear — it does not correspond to any of the named endpoints listed on the provider's homepage (which use paths like `/api/v1/...` and `/api/v2/...`). The x402 challenge indicates a maximum payment of 20,000 units of USDC (likely 0.02 USDC given 6 decimals, consistent with the site's advertised $0.02/request pricing). The platform advertises no API keys, no rate limits, and instant access. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a "Connect wallet" prompt with no substantive content.
Because the endpoint's actual functionality is undocumented and the path does not match any cataloged API, treat this as a generic or placeholder premium endpoint. There is no OpenAPI schema, no request/response examples, and no detailed documentation available.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-request USDC micropayments
- —Agent-driven API consumption without API keys or subscriptions
- —Demonstrating x402 payment protocol integration on Base
Fit
Best for
- —Developers experimenting with x402 pay-per-request protocols
- —Agents that need keyless, on-demand API access via crypto micropayments
- —Projects already operating on the Base L2 network with USDC
Not for
- —Users who need well-documented, production-grade APIs with clear schemas
- —Anyone without a Base-network USDC wallet
- —Use cases requiring predictable, documented response formats
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-25 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) but its actual functionality is completely undocumented. The path /api/endpoint-25 does not match any named API on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —Endpoint path /api/endpoint-25 does not match any documented API on the provider's homepage
- —No documentation, OpenAPI schema, or request/response examples available
- —All doc pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content
- —Actual functionality of this endpoint is unknown — it may be a test or placeholder endpoint
Citations
- —The provider's homepage lists APIs at $0.02/request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns a maxAmountRequired of 20000 USDC units on the Base network for this endpointhttps://lowpaymentfee.com/api/endpoint-25
- —Documentation pages (/docs, /pricing, /README) contain only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs