Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a notifications API accessible via the x402 payment protocol. The specific resource `/api/v1/notifications/100` accepts POST requests and charges 20,000 base units of USDC on the Base network per call, which equals $0.02 (USD Coin uses 6 decimals). Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 endpoints are listed at $0.02 per request and settle on the Base network in USDC.
However, the specific functionality of the `/api/v1/notifications/100` endpoint is unclear. The x402 challenge describes it only as "Premium API Access" with a JSON MIME type response. No OpenAPI schema, request body documentation, or example responses were found in the crawl. The `100` path segment may refer to a notification ID or batch size, but this is unconfirmed. Agents should be aware that the endpoint's actual behavior is undocumented beyond the payment challenge.
Capabilities
Use cases
- —Triggering or retrieving notifications via a single paid API call
- —Agent-driven workflows that need a notification service without account setup
- —Programmatic access to notification data with per-request USDC micropayments
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go notification access
- —AI agents that can settle x402 payments on Base in USDC
- —Use cases requiring low-friction, keyless API access
Not for
- —High-volume notification workloads where per-call pricing adds up quickly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of the notifications/100 endpoint is entirely undescribed. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful content.
Warnings
- —No API documentation or OpenAPI schema available for this endpoint
- —The exact purpose and expected request body of /api/v1/notifications/100 are unknown
- —No example responses were found; actual output format is unverified
- —The broader platform lists many endpoints but none have detailed docs in the crawl
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/notifications/100
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com