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/42`. 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 uniformly at $0.02 per request and settled in USDC on the Base network via the x402 protocol.
The specific endpoint probed (`/api/v1/notifications/42`) accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment voucher for up to 20,000 base units of USDC (i.e., $0.02) on Base. No API keys, accounts, or rate limits are advertised — access is gated purely by micropayment.
Documentation beyond the landing-page catalog is essentially absent: the `/api`, `/pricing`, and `/README` routes all resolve to a wallet-connect stub with no further detail. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (402 challenge returned), but the actual behavior of the notifications resource — what it returns, what POST body it expects — is unknown from the available material.
Capabilities
Use cases
- —Triggering or retrieving notification data via a single micropayment call
- —Integrating pay-per-use notification services into agent workflows without API key management
- —Demonstrating x402 micropayment protocol usage on Base
Fit
Best for
- —Agents or developers wanting zero-signup, pay-per-call notification access
- —x402 protocol experimentation on Base with low-cost USDC payments
- —Scenarios where no rate limits and no API keys are preferred
Not for
- —Users needing detailed documentation or guaranteed SLAs before integration
- —High-volume notification pipelines where $0.02/request adds up significantly
- —Anyone requiring non-USDC or non-Base payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/42 \
-H "X-PAYMENT: <x402_payment_voucher>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing-page catalog, and the actual purpose of the /notifications/42 resource is unexplained. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown.
- —The /api, /pricing, and /README pages all resolve to a wallet-connect stub with no content.
- —The specific behavior of /api/v1/notifications/42 (what it does, what it returns) is not documented anywhere in the crawled material.
- —Endpoint purpose is unclear: 'Premium API Access' is a generic label shared across many endpoints on this platform.
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x8335…)https://lowpaymentfee.com/api/v1/notifications/42
- —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