x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/endpoint-40` is part of the lowpaymentfee.com platform, which hosts a collection of x402 protocol-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, 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 (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).
The specific functionality behind `/api/endpoint-40` is not documented — the provider's site lists various endpoints under `/api/v1/` and `/api/v2/` paths (analytics, AI, finance, utilities), but `/api/endpoint-40` does not appear among them. The maximum payment required per request is 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 is extremely sparse. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint actually does. Without knowing the endpoint's purpose, callers must experiment or contact the provider for details.
Capabilities
Use cases
- —Programmatic access to an x402-gated service with USDC micropayments
- —Agent-driven API consumption without API keys or subscriptions
- —Testing x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can pay per-request with USDC on Base
- —Users who want keyless, commitment-free API access
Not for
- —Anyone needing documented, well-specified API contracts
- —Use cases requiring known, predictable response schemas
- —High-volume consumers who need bulk pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/endpoint-40 actually does. No OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint path doesn't match any listed API on the provider's site, making this effectively a stub listing.
Warnings
- —Endpoint /api/endpoint-40 is not listed among the provider's documented APIs — its actual functionality is unknown.
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content.
- —No request or response schema available; callers cannot know what to send or expect back.
- —The specific purpose of this endpoint cannot be verified from available sources.
Citations
- —The provider site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge specifies USDC on Base with maxAmountRequired of 20000 and payTo address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.https://lowpaymentfee.com/api/endpoint-40
- —The provider lists APIs under /api/v1/ and /api/v2/ paths but /api/endpoint-40 does not appear among them.https://lowpaymentfee.com
- —Docs, API, pricing, and README pages all returned only 'Connect wallet' with no substantive documentation.https://lowpaymentfee.com/docs