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/40` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific endpoint probed here is labeled "Premium API Access" and accepts POST requests.
The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. No API keys or rate limits are advertised; access is gated purely by per-call USDC payment.
The exact functionality behind the `/notifications/40` path is not documented in the crawled material. The provider's landing page lists categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, but this specific notifications endpoint does not appear in those listings. Without further documentation or an OpenAPI schema, the precise input/output behavior of this endpoint remains unclear.
Capabilities
Use cases
- —Sending or retrieving notifications via a pay-per-call model without API keys
- —Agent-initiated notification triggers settled instantly in USDC on Base
- —Integrating low-cost notification functionality into automated workflows
Fit
Best for
- —Developers wanting keyless, pay-per-use notification endpoints
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing well-documented, schema-specified notification APIs
- —High-volume notification use cases where per-call pricing is inefficient
- —Users who cannot pay in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, the specific /notifications/40 endpoint is not documented anywhere in the crawled material, there is no OpenAPI schema, no request/response examples, and the actual functionality is unknown. This is effectively a stub listing.
Warnings
- —The /notifications/40 endpoint is not listed on the provider's landing page among their advertised APIs — its purpose is undocumented.
- —No OpenAPI schema, request body specification, or response format is available.
- —No documentation pages returned meaningful content (pricing, README, and /api pages only showed 'Connect wallet').
- —Exact behavior of this endpoint is unknown; 'Premium API Access' is a generic label applied across the platform.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/notifications/40
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The landing page lists APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but does not list a /notifications endpoint.https://lowpaymentfee.com