Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/notifications/49` 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 simply attach an x402 payment header to each request.
The broader lowpaymentfee.com platform lists endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, this specific listing covers only the `/api/v1/notifications/49` endpoint, whose exact functionality is not documented beyond the "Premium API Access" label. There is no OpenAPI schema, no request/response examples, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail.
Because the endpoint's actual behavior (what notification data it returns or what input it expects) is undocumented, callers should treat this as an exploratory integration. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.
Capabilities
Use cases
- —Retrieving notification data on a per-call payment basis
- —Integrating pay-per-request notifications into agent workflows
- —Testing x402 micropayment flows against a live endpoint
Fit
Best for
- —Developers exploring x402 payment protocol integrations
- —Agents needing low-cost, keyless API access on Base
- —One-off or low-volume notification lookups without subscriptions
Not for
- —Production systems requiring documented request/response schemas
- —High-throughput notification streaming (no documented batch or websocket support)
- —Users who need fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/49 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the endpoint's actual functionality beyond the generic 'Premium API Access' label is completely undocumented. The docs, pricing, and README pages all resolve to a wallet-connect stub with no useful content.
Warnings
- —No OpenAPI or JSON schema available — request and response formats are unknown
- —Endpoint purpose ('notifications/49') is undocumented; 'Premium API Access' is a generic label
- —Docs, pricing, and README pages return only a wallet-connect prompt with no substantive content
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network, equaling $0.02 per requesthttps://lowpaymentfee.com/api/v1/notifications/49
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com