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Register subscriptions for the events you care about. When a matching event occurs, Endl delivers it — either by pushing it to your endpoint or by making it available for you to poll.

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Delivery modes

PUSH

Endl sends each event to your HTTPS endpoint as a signed POST, with retries. You host a receiver. This is the default.

PULL

Endl delivers nothing. You poll the event feed and checkpoint a cursor.

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Base URL

All webhook endpoints live under /api/v0.

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Quickstart

1

Authenticate

Send X-API-KEY and X-API-SECRET on every request. See Authentication.
2

Create a subscription

Register your receiver URL and the event types you want. The response returns your signing secret once — store it before moving on.
3

Receive and verify

Endl POSTs each event with an X-WEBHOOK-SIGNATURE header. Verify it before trusting the payload.
4

Inspect deliveries

Every attempt is recorded. List them, drill into one, or retry.

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Conventions

Your identity comes from your API key, so you only ever see and manage your own resources. Every response is wrapped in the standard envelope. Timestamps are ISO-8601 UTC with three fraction digits — 2026-09-02T12:34:56.789Z.
Phase 1. Subscriptions are PUSH or PULL. SQS and SSE modes are reserved but not yet available; requesting one returns 422.

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Next steps

Verify signatures

Prove a delivery came from Endl before acting on it.

Manage subscriptions

Create, update, pause, and rotate secrets.

Inspect deliveries

See every attempt, and retry the ones that failed.

Event types

The event catalogue, enums, and limits.