Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/notifications/53` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and infrastructure utilities. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no subscriptions required.
The specific endpoint probed (`/api/v1/notifications/53`) is listed under the provider's umbrella as "Premium API Access." The x402 challenge confirms it is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 per request (USDC uses 6 decimals). The endpoint accepts POST requests and returns `application/json`. No detailed input or output schema is documented beyond the x402 challenge metadata.
The broader platform advertises 16+ endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more — all at the same $0.02/request price point. Documentation is minimal: the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. Without OpenAPI specs or example payloads, the exact request body format and response structure for this notifications endpoint remain unknown.
Capabilities
Use cases
- —Triggering or retrieving notifications via a pay-per-call model without managing API keys
- —Integrating notification delivery into agent workflows that settle payments on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need simple, keyless, per-call access to notification services
- —Projects already operating on the Base L2 with USDC
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume notification pipelines where per-call pricing adds up quickly
- —Anyone requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/53 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The purpose of 'notifications/53' is entirely opaque — it could be a notification retrieval, trigger, or something else. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The exact purpose and payload format of /api/v1/notifications/53 is undocumented
- —All ancillary pages (/api, /pricing, /README) return only a wallet-connect prompt with no useful content
- —The endpoint name 'Premium API Access' is generic and does not describe functionality
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/notifications/53
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/notifications/53
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —The platform offers 16+ endpoints across data/analytics, AI/ML, finance/web3, and infrastructure categorieshttps://lowpaymentfee.com