x402-gated notification endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/notifications/78` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs settled in USDC on the Base network. The specific endpoint is labeled "Premium API Access" and accepts POST requests. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys, subscriptions, or rate limits are advertised — access is purely payment-gated.
The broader lowpaymentfee.com platform offers endpoints across several categories including 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.
The specific functionality behind `/api/v1/notifications/78` is not documented beyond the label "Premium API Access." There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it returns upon successful payment is unknown.
Capabilities
Use cases
- —Accessing a notification or alert service via a single paid API call
- —Integrating pay-per-use notification delivery into an agent workflow
- —Testing x402 payment protocol integration with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need simple pay-per-call access without API key management
- —Low-cost per-request notification or data retrieval
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume notification use cases where per-request pricing may add up
- —Anyone needing guaranteed SLA or support — no documentation or contact info available
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/78 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what the endpoint actually returns, no request/response schema, and no examples. The label 'Premium API Access' is generic and uninformative. The broader site lists many endpoints but provides no detail beyond names and prices.
Warnings
- —No documentation exists for what this endpoint returns upon successful payment
- —No OpenAPI schema or request/response examples available
- —The endpoint path '/api/v1/notifications/78' suggests a resource-specific notification but the exact semantics are unknown
- —The broader platform lists many endpoints but crawled pages beyond the homepage returned only 'Connect wallet' with no content
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/notifications/78
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/notifications/78