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 "Premium API Access" notification resource at `/api/v1/notifications/12`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol.
The specific endpoint probed (`/api/v1/notifications/12`) accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment for up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys or accounts are required — access is gated purely by micropayment. The platform advertises no rate limits and instant access.
Because this particular path (`/notifications/12`) is not described in the site's public API listing (which covers analytics, AI, finance, and utility categories), its exact functionality is unclear. The crawl material does not provide request/response schemas or documentation for notification endpoints specifically. The broader platform appears to be a demonstration or marketplace of low-fee x402-gated APIs, but details on what data or action the notifications endpoint returns are not available from the crawled content.
Capabilities
Use cases
- —Triggering or retrieving notification data via a single paid API call
- —Demonstrating x402 micropayment integration for agent-to-agent commerce
- —Accessing premium notification content without traditional API key signup
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents that can settle USDC micropayments on Base
- —Use cases requiring keyless, per-call API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume consumers who prefer subscription-based pricing over per-call payments
- —Anyone needing notification endpoints with well-documented schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/12 \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and the specific /notifications/12 path is not listed on the provider's own site. Functionality must be entirely inferred.
Warnings
- —The /api/v1/notifications/12 endpoint is not listed among the provider's publicly advertised APIs — its purpose is unknown.
- —No request body schema or response schema is documented anywhere in the crawled material.
- —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.
- —Endpoint functionality is entirely opaque; callers cannot know what they are paying for without trial calls.
Citations
- —The platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/notifications/12 requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/notifications/12
- —USDC uses 6 decimals, so 20000 base units = $0.02.https://lowpaymentfee.com