Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/notifications/13` 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 payment protocol, settling in USDC on the Base network. The specific endpoint listed here is described as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals).
The broader platform advertises categories including 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 (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no minimum commitments required.
The specific functionality of the `/api/v1/notifications/13` endpoint is not documented beyond the generic "Premium API Access" label. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is live and returns a valid x402 challenge via POST, accepting USDC payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.
Capabilities
Use cases
- —Sending or retrieving notifications via a pay-per-call model without API key management
- —Integrating low-cost notification functionality into agent workflows using x402 payments
- —Accessing premium notification data with per-request USDC micropayments on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing notification endpoints without subscription overhead
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume use cases where per-request pricing may add up compared to subscription plans
- —Anyone unable to pay in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/13 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/notifications/13 is entirely undocumented. There is no OpenAPI schema, no request/response examples, and the description is a generic 'Premium API Access' label. The crawled pages provide only a high-level catalog listing with no detail on this particular endpoint.
Warnings
- —No documentation exists for what /api/v1/notifications/13 actually does — 'Premium API Access' is a generic label
- —No OpenAPI schema, request format, or response format is available
- —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content
- —This endpoint does not appear in the site's own catalog of available APIs
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/notifications/13
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/notifications/13
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com