x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/endpoint-48` 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, and infrastructure utilities. The specific 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 platform advertises a flat $0.02 per request across its listed endpoints, though this particular endpoint's x402 challenge specifies a maxAmountRequired of 20000 (in USDC's 6-decimal representation, equating to $0.02). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The endpoint is live and returns a proper 402 challenge.
However, the exact functionality behind `/api/endpoint-48` is unclear. It does not correspond to any of the named endpoints listed on the site's homepage (which use paths like `/api/v1/...` and `/api/v2/...`). No documentation, input schema, or example responses are available for this specific path. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content. Without knowing what this endpoint actually does, callers should treat it as an opaque premium API with uncertain functionality.
Capabilities
Use cases
- —Programmatic access to an x402-gated premium service via POST requests
- —Agent-driven API consumption with per-request USDC micropayments on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —AI agents that can autonomously pay for API calls via Base USDC
- —Users who want keyless, pay-as-you-go API access
Not for
- —Users who need clear documentation of input/output schemas before calling
- —Anyone requiring free or subscription-based API access
- —Production workloads that depend on well-documented, stable API contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-48 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/endpoint-48",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-payment-proof>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The endpoint is live and returns a valid 402 challenge, but there is no documentation, no input/output schema, and the endpoint path does not match any of the named APIs on the site. The actual functionality is unknown, making this effectively a stub listing.
Warnings
- —Endpoint path /api/endpoint-48 does not match any documented API on the site's homepage
- —No input schema or output schema available — callers cannot know what to send or expect
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content
- —Actual functionality of this endpoint is completely unknown
Citations
- —The endpoint returns a 402 challenge with x402Version 1 on POSThttps://lowpaymentfee.com/api/endpoint-48
- —Payment is via USDC on Base network with maxAmountRequired of 20000 (≈$0.02)https://lowpaymentfee.com/api/endpoint-48
- —The site lists various APIs at $0.02/request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/endpoint-48