Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/notifications/85` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific endpoint being listed here is labeled "Premium API Access" and accepts POST requests, returning JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals). No API keys or rate limits are advertised; access is gated purely by the x402 payment challenge.
The broader lowpaymentfee.com platform lists 16+ endpoints across four categories: Data & Analytics (metrics, reports, 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 uniformly at $0.02 per request. However, the specific functionality behind `/api/v1/notifications/85` is not documented beyond the generic "Premium API Access" label, so its exact behavior is unclear. There is no OpenAPI spec, no request/response schema documentation, and the crawled docs pages (pricing, README, API) all resolve to a minimal "Connect wallet" prompt with no additional detail.
Capabilities
Use cases
- —Sending or retrieving notifications via a pay-per-call model without needing an API key
- —Agent-driven workflows that need a simple, keyless notification endpoint settled in USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need keyless, per-request access to notification services
- —Low-volume, pay-as-you-go usage without subscriptions or commitments
Not for
- —High-volume notification workloads where per-call pricing adds up quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone requiring fiat-only payment — this endpoint requires USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/85 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific notifications endpoint actually does — no request schema, no response schema, no examples, and the crawled pages beyond the landing page are empty. The generic 'Premium API Access' label provides no functional insight.
Warnings
- —No documentation exists for /api/v1/notifications/85 — the exact functionality is unknown
- —No OpenAPI spec or request/response schema is available
- —The /pricing, /README, and /api pages all resolve to a minimal 'Connect wallet' page with no content
- —The endpoint name 'Premium API Access' is generic and does not describe what the notification endpoint does
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/notifications/85
- —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
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/notifications/85