Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/accounts/135` appears to be one of many endpoints offered by the platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.
The endpoint is live and returns a valid x402 challenge on POST. Payment is settled in USDC (contract 0x8335…2913) on the Base network using the "exact" scheme. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys or rate limits are advertised; access is granted per-call upon payment. The timeout for payment settlement is 300 seconds.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what the `/api/v1/accounts/135` endpoint specifically returns. The platform landing page lists many other endpoints but does not clarify what "accounts/135" delivers. Prospective callers should be aware that the actual functionality behind this specific path is undocumented.
Capabilities
Use cases
- —Accessing a premium API endpoint with per-call USDC micropayments on Base
- —Integrating pay-as-you-go API calls into agent workflows without API keys
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, per-request API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Applications requiring free or subscription-based API access
- —Anyone needing clarity on what data this specific endpoint returns
Quick start
# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# POST to the endpoint; without payment you receive the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/accounts/135
# Returns 402 with x402 challenge JSON describing USDC payment on Base.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/v1/accounts/135",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema for the actual paid response, and the specific purpose of /api/v1/accounts/135 is entirely unclear. The docs pages are empty stubs.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/accounts/135 is undocumented; it is unclear what data or service this endpoint provides.
- —No OpenAPI spec or request/response schema is available.
- —No robots.txt or agents.txt found.
Citations
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all at $0.02/request.https://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base.https://lowpaymentfee.com/api/v1/accounts/135