Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/orders/11` is described as "Premium API Access" and accepts POST requests, charging up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or upfront commitments are required — each request is paid for individually via an X-PAYMENT header.
The broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.
However, the specific endpoint being listed here (`/api/v1/orders/11`) is labeled generically as "Premium API Access" and does not appear in the site's published API catalog. There is no documentation describing what this particular order endpoint returns, what input it expects, or what its output schema looks like. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional content. Without further documentation, the actual functionality of this endpoint remains unclear.
Capabilities
Use cases
- —Programmatic access to a pay-per-request API without needing API keys or subscriptions
- —Agent-driven workflows that settle per-call costs in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —Agents that need keyless, per-request API access settled in USDC
- —Low-volume or sporadic API consumers who prefer pay-as-you-go
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/11 \
-H "Content-Type: application/json"
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with valid USDC payment 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/v1/orders/11",
"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 for this specific endpoint, no input/output schema, no examples of successful responses, and the docs pages are empty. The endpoint path '/api/v1/orders/11' doesn't match any listed API on the site, making its actual functionality unknown.
Warnings
- —The endpoint /api/v1/orders/11 is not listed in the site's published API catalog — its actual functionality is undocumented.
- —All documentation pages (docs, pricing, API, README) rendered only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec, input schema, or successful response examples are available.
- —No information on what 'Premium API Access' actually returns after payment.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/orders/11
- —All listed APIs are priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/orders/11