Load Events - Alvys

Alvys emits webhook events for the load lifecycle, so external systems stay in sync in real time instead of polling the Loads API.

Event	Fires when	Carries `data.diff`
`load.status.changed`	A load’s status transitions (e.g. `Covered` → `Dispatched`)	No
`load.changed`	Any meaningful load write (rate, appointments, stops, carrier, references, …)	Yes (optional)

Subscribe to either or both when creating or updating a webhook (see Webhook Lifecycle & Configuration). The full list of valid event-type strings is returned by GET /api/p/v1/webhooks/event-types.

Status vs. changed

load.status.changed fires only on a status transition and never includes a data.diff. load.changed fires on every meaningful write — including status changes — and can include an optional data.diff describing what changed. See Change Diffs (data.diff).

A single underlying write can emit both events — one load.status.changed and one load.changed. They are distinguished by the suffix on the event id: -1 for the status event and -0 for the changed event. Use X-Alvys-Event-Id for idempotency so the two are processed independently and duplicates are ignored.

Payload

Load events use the standard Alvys webhook envelope. The data.load object carries the full current snapshot of the load — the same shape the Loads API returns from its GET endpoint.

`load.status.changed`

{
  "id": "3cd9960e-ef75-446c-92e4-e9815f6e4024-1",
  "type": "load.status.changed",
  "timestamp": "2026-02-23T15:19:35.8794642+00:00",
  "version": "v1",
  "data": {
    "load": { "...": "full current Load snapshot (matches GET /api/p/v1/loads)" }
  }
}

`load.changed`

{
  "id": "3cd9960e-ef75-446c-92e4-e9815f6e4024-0",
  "type": "load.changed",
  "timestamp": "2026-02-23T15:19:35.8794642+00:00",
  "version": "v1",
  "data": {
    "load": { "...": "full current Load snapshot" },
    "diff": {
      "changes": [
        { "kind": "StatusChanged" },
        { "kind": "RateChanged" },
        { "kind": "FieldChanged", "target": { "type": "Field", "id": "PONumber" } }
      ],
      "previousAttributes": { "...": "previous values (opt-in)" }
    }
  }
}

Notes

Because data.load always carries the full snapshot, you can apply the current state directly without a follow-up GET. To react to only what changed, use data.diff.
Delivery is at-least-once — deduplicate on X-Alvys-Event-Id. See Event Delivery & Reliability.
data.diff is omitted on the first event for a load (create) and is never present on load.status.changed.

​Status vs. changed

​Payload

​load.status.changed

​load.changed

​Notes

Status vs. changed

Payload

`load.status.changed`

`load.changed`

Notes