Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at `/api/v1/notifications/47` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol, requiring a USDC payment on the Base network for each call — no API keys, no rate limits, no subscriptions.
The specific endpoint probed (`/api/v1/notifications/47`) is labeled "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base, 6 decimals), which equals $0.02 per request. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The broader platform lists 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all priced uniformly at $0.02 per request. However, the specific functionality behind the `/notifications/47` path is not documented — the crawl material provides no schema, request/response examples, or description beyond the generic "Premium API Access" label. The endpoint is live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.
Capabilities
Use cases
- —Triggering a notification via a single paid API call without needing an API key
- —Integrating pay-per-use notification delivery into an agent workflow
- —Testing x402 payment flows on Base with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need keyless, pay-per-call access to notification services
- —Low-volume, on-demand notification triggers without subscription overhead
Not for
- —High-volume notification pipelines where per-call pricing is inefficient
- —Use cases requiring detailed API documentation or guaranteed SLAs
- —Users who need to understand the exact response schema before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/47 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation on what the /notifications/47 endpoint actually does, no request/response schema, and no examples. The listing is effectively a stub with only pricing and protocol details confirmed.
Warnings
- —No documentation exists for the /notifications/47 endpoint — its actual functionality is unknown.
- —No request body schema or response schema is provided.
- —The crawl pages for /api, /pricing, and /README returned only 'Connect wallet' with no useful content.
- —The endpoint path includes a numeric ID (47) suggesting it may be resource-specific, but no context is given.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/notifications/47
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/notifications/47
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com