Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/notifications/71` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is labeled "Premium API Access" and accepts POST requests. Payment is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are advertised; callers pay per request with an x402 payment header.
The broader lowpaymentfee.com platform lists endpoints across several 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, this specific listing is for the `/api/v1/notifications/71` path, which does not appear in any of the documented categories on the landing page. Its exact functionality — what kind of notification it returns or triggers — is not documented.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with payment details: pay to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, asset USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`), with a 300-second timeout. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.
Capabilities
Use cases
- —Triggering or retrieving notifications via a single paid API call
- —Integrating pay-per-use notification delivery into agent workflows
- —Testing x402 payment flows with a low-cost endpoint
Fit
Best for
- —Agents needing simple pay-per-call notification access without API keys
- —Developers experimenting with x402 protocol integrations on Base
- —Low-volume, on-demand notification retrieval or dispatch
Not for
- —High-volume notification pipelines requiring bulk pricing or subscriptions
- —Use cases requiring detailed documentation or guaranteed SLAs
- —Users who need to understand the exact notification payload before purchasing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/71 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific /notifications/71 path is not documented anywhere on the site. No request/response schema, no examples, and no explanation of what the notification endpoint actually does. The landing page documents other endpoints but not this one, making it effectively a stub.
Warnings
- —The /api/v1/notifications/71 endpoint is not listed among the documented APIs on the provider's landing page — its exact functionality is unknown.
- —No request body schema or response schema is available for this endpoint.
- —No documentation pages (pricing, README, API docs) returned meaningful content beyond a 'Connect wallet' prompt.
- —The purpose of the '71' path parameter (notification ID? type?) is undocumented.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/notifications/71
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/notifications/71
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list a notifications endpointhttps://lowpaymentfee.com