Pay-per-request notification endpoint on Base via x402 — $0.02 per call in USDC.
What it does
This endpoint at `/api/v1/notifications/79` 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 $0.02 per call (20,000 base units of USDC with 6 decimals), settled on-chain to a specified wallet address. No API keys, rate limits, or subscriptions are required — each request is individually paid for via the x402 payment header.
The broader lowpaymentfee.com platform advertises endpoints across several 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific functionality of the `/api/v1/notifications/79` endpoint is not documented beyond the generic "Premium API Access" label, so its exact input/output behavior is unclear.
The endpoint is live and returns a valid x402 challenge (HTTP 402) when called without payment. The x402 version is 1, the payment scheme is "exact", and the timeout is 300 seconds. There is no OpenAPI schema, no detailed documentation, and no example responses available from the crawled pages.
Capabilities
Use cases
- —Sending or triggering notifications via a pay-per-call model without API key management
- —Integrating notification capabilities into agent workflows that settle payments on Base
- —Testing x402 protocol integration with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agent-based systems that need keyless, pay-per-use API access
- —Use cases requiring on-chain payment settlement for API calls
Not for
- —Users needing well-documented notification APIs with clear input/output schemas
- —High-volume notification use cases where per-request on-chain payment adds overhead
- —Anyone requiring fiat-only billing or traditional API key authentication
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/79 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of the /notifications/79 path is entirely undocumented. The listing is effectively a stub with only pricing and protocol details confirmed.
Warnings
- —No documentation exists for the /api/v1/notifications/79 endpoint beyond the generic label 'Premium API Access'
- —No OpenAPI or input/output schema available — request body format and response structure are unknown
- —The broader site's /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content
- —It is unclear what 'notifications/79' actually does — the '79' may be a resource ID but its meaning is not documented
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/notifications/79
- —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 offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/notifications/79