Pay-per-call notification endpoint on Base via x402, settled 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/63`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol.
The specific `/api/v1/notifications/63` endpoint accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment for up to 20,000 base units of USDC (i.e., $0.02) to the payee address `0x1A2B…85F3`. No API keys, subscriptions, or rate limits are advertised — access is purely gated by per-request micropayment.
Documentation beyond the landing page is sparse. The crawled /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact functionality behind the "notifications/63" resource is unclear — it could be a notification delivery, retrieval, or status endpoint. Agents should treat this as a low-cost experimental endpoint and verify behavior with a test call.
Capabilities
Use cases
- —Sending or retrieving notifications via a pay-per-call model without API key management
- —Agent-driven workflows that need to trigger or check notification status with inline USDC payment
- —Testing x402 micropayment integrations on the Base network
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need keyless, per-request access to notification services
- —Low-volume use cases where $0.02/call is acceptable
Not for
- —High-volume notification pipelines where per-call payment overhead is impractical
- —Users who need detailed documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/notifications/63 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the purpose of the specific /notifications/63 resource is unexplained. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —The exact purpose of /api/v1/notifications/63 is not documented; 'Premium API Access' is a generic label used across the platform.
- —All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content.
- —Platform lists many endpoint categories but none have detailed docs; treat as experimental.
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/notifications/63
- —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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/notifications/63