x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/endpoint-93` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request 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 endpoint `/api/endpoint-93` does not correspond to any of the documented API paths listed on the provider's homepage (which use `/api/v1/` and `/api/v2/` prefixes). The crawled documentation, pricing, and README pages returned only a "Connect wallet" prompt with no additional content. As a result, the actual functionality behind this endpoint is unknown — the description "Premium API Access" is the only label provided, and no input/output schema, example payloads, or detailed documentation are available.
The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payment-gated requests. The maximum amount required is 20,000 units of USDC (likely 0.02 USDC given 6 decimals, consistent with the $0.02/request pricing shown on the homepage). No API keys or rate limits are advertised.
Capabilities
Use cases
- —Programmatic access to a premium API service via x402 micropayments
- —Agent-driven API consumption without API keys or subscriptions
- —Paying per-request with USDC on Base for on-demand data or services
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can handle x402 payment challenges autonomously
- —Users who prefer crypto micropayments over traditional API subscriptions
Not for
- —Users who need detailed documentation or known input/output schemas before integrating
- —Anyone requiring free or trial access to evaluate functionality first
- —Use cases requiring high-throughput with predictable flat-rate pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-93
# Returns 402 with x402 payment challenge.
# Attach X-PAYMENT header with a valid USDC payment on Base to access.Example
Response
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://lowpaymentfee.com/api/endpoint-93",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The x402 challenge is live and well-formed, but the endpoint path `/api/endpoint-93` doesn't match any documented API on the site. No documentation, input schema, output schema, or examples exist. The actual functionality is completely unknown, making this effectively a stub listing.
Warnings
- —Endpoint path /api/endpoint-93 does not match any documented API paths on the provider's homepage
- —No input or output schema available — actual functionality is unknown
- —Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no useful content
- —The label 'Premium API Access' is generic and does not describe what the endpoint does
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base networkhttps://lowpaymentfee.com/api/endpoint-93
- —The provider homepage lists APIs at /api/v1/ and /api/v2/ paths priced at $0.02/requesthttps://lowpaymentfee.com
- —The site advertises no API keys, no rate limits, instant access, and Base network paymentshttps://lowpaymentfee.com