Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-92`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, subscriptions, or rate limits are advertised.
The broader lowpaymentfee.com platform advertises endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/endpoint-92` does not map to any of the named endpoints on the site's landing page, so its exact functionality is unclear.
The endpoint settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without managing API keys or subscriptions
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents with Base USDC wallets needing on-demand API access
- —Low-volume, pay-as-you-go API consumption without signup
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where $0.02/request adds up without bulk discounts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-92 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/endpoint-92",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-payment-token>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/endpoint-92 is unknown — it doesn't match any named endpoint on the site. No OpenAPI schema, no documentation, no example responses, and all doc pages render only 'Connect wallet'. This is effectively a stub listing.
Warnings
- —The endpoint path /api/endpoint-92 does not correspond to any named API on the provider's landing page; its actual functionality is unknown.
- —No OpenAPI schema or documentation is available — docs, pricing, and API pages all show only 'Connect wallet'.
- —No example response is available; the output format and fields are entirely unknown.
- —The provider site appears to be a generic x402 demo or template; endpoint reliability and data quality are unverified.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/endpoint-92
- —All listed endpoints on the site are priced at $0.02/request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/endpoint-92
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com