Pay-per-call notifications 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 path `/api/v1/notifications/10` accepts POST requests and charges 0.02 USDC per call (20,000 base units of USDC on Base network, which has 6 decimals). Payment is settled on-chain on Base to the specified wallet address, with no API keys, rate limits, or upfront commitments required.
The broader lowpaymentfee.com platform offers 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 uniformly priced at $0.02 per request and use the same x402 payment mechanism on Base with USDC.
The specific functionality of the `/api/v1/notifications/10` endpoint 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 it actually returns upon successful payment is unknown.
Capabilities
Use cases
- —Sending or retrieving notifications via a pay-per-call model without API key management
- —Integrating low-cost notification triggers into agent workflows
- —Testing x402 payment protocol integrations with a live, inexpensive endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing simple pay-per-call notification access on Base
- —Projects that want to avoid API key provisioning and subscription commitments
Not for
- —Production notification systems requiring documented schemas and SLAs
- —Use cases needing high-volume notifications at sub-cent pricing
- —Anyone requiring detailed documentation or guaranteed response formats
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/10 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation on what the notifications endpoint actually does, no request/response schema, and no examples. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The endpoint's purpose is effectively a stub.
Warnings
- —No documentation exists for the /api/v1/notifications/10 endpoint beyond the label 'Premium API Access'
- —No OpenAPI schema, request body format, or response format is available
- —The /pricing, /api, and /README pages returned no useful content (just 'Connect wallet')
- —Actual functionality of this specific endpoint is unknown — it may be a placeholder or test endpoint
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/notifications/10
- —All endpoints on the platform 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
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/notifications/10