x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/endpoint-45` is part of lowpaymentfee.com, a platform offering a variety of x402-gated API endpoints 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 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), with a maximum amount of 20,000 units (in USDC's 6-decimal representation, this equates to $0.02 per request).
The platform advertises a simple pricing model of $0.02 per request across all its endpoints, with no API keys, no rate limits, no minimums, and instant access. However, the specific functionality behind `/api/endpoint-45` is not documented — it does not appear in the site's listed API catalog, which uses versioned paths like `/api/v1/` and `/api/v2/`. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without documentation or schema details for this particular endpoint, its actual capabilities remain unknown.
The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payment-gated requests. But the lack of input/output schema, example payloads, or any description of what this endpoint actually does significantly limits its usefulness for programmatic discovery by agents.
Capabilities
Use cases
- —Accessing a pay-per-request API endpoint without needing API keys or subscriptions
- —Making micropayment-gated API calls using USDC on Base
- —Programmatic agent purchasing of API access via x402 protocol
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can handle x402 payment challenges on Base
- —Users who want keyless, pay-as-you-go API access
Not for
- —Users who need documented input/output schemas before calling an endpoint
- —Production workloads requiring SLA guarantees or detailed documentation
- —Anyone needing free or non-crypto payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-45
# Returns 402 with x402 payment challenge
# Include X-PAYMENT header with valid USDC payment on Base to accessExample
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-45",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The x402 challenge is live and well-formed, but this specific endpoint (/api/endpoint-45) has no documentation, no input/output schema, no examples, and does not appear in the site's own API catalog. The crawled docs/pricing/README pages were all empty beyond a wallet-connect prompt. The actual functionality is completely unknown.
Warnings
- —Endpoint /api/endpoint-45 is not listed in the provider's own API catalog — its purpose is unknown
- —No input schema or output schema documented; callers cannot know what to send or expect
- —All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content
- —The generic name 'Premium API Access' provides no indication of actual functionality
Citations
- —Platform charges $0.02 per request with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —x402 challenge is live with maxAmountRequired of 20000 USDC units on Base networkhttps://lowpaymentfee.com/api/endpoint-45
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/endpoint-45