x402-gated notification endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource `/api/v1/notifications/36` accepts POST requests and charges 0.02 USDC per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). Payment is settled on-chain to a Base address using the exact payment scheme with a 300-second timeout.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs across several categories: 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 with no API keys, no rate limits, and no minimum commitments.
However, the specific endpoint being listed here (`/api/v1/notifications/36`) is not described in any of the site's public documentation or landing page categories. Its exact functionality is unclear — the name suggests it may deliver or trigger a notification resource identified by ID 36, but no schema, example payloads, or documentation were found. The endpoint is confirmed live (returns a valid 402 x402 challenge), but the lack of documentation about what it actually returns or expects as input is a significant gap.
Capabilities
Use cases
- —Triggering or retrieving a specific notification via a paid API call
- —Integrating pay-per-use notification delivery into an agent workflow
- —Accessing premium notification data without API key management
Fit
Best for
- —Agents that need on-demand notification access with crypto micropayments
- —Developers wanting keyless, pay-per-request API access on Base
- —Workflows requiring x402-compatible notification endpoints
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —High-volume notification use cases where per-request pricing is inefficient
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/36 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no input/output schema, and the specific notifications/36 resource is not mentioned anywhere on the provider's site. Functionality must be entirely guessed from the URL path. This is effectively a stub listing.
Warnings
- —The endpoint /api/v1/notifications/36 is not listed or documented on the provider's landing page or any crawled page.
- —No input or output schema is available — the actual request body format and response structure are unknown.
- —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.
- —The notification resource ID '36' is hardcoded in the URL; it is unclear if other IDs exist or what they represent.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/notifications/36
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/notifications/36
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site advertises categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com