---
title: "Simulate sequence"
method: GET
path: "/sequences/{sequenceId}/simulate"
tags: ["Sequences"]
---

# Simulate sequence

`GET /sequences/{sequenceId}/simulate`

Dry-runs a sequence without sending mail or enrolling anyone. Activating does not auto-enroll anyone. Without a subscriber this reports who currently matches and activation readiness errors. Pass subscriberId or email to also walk that stored contact's branch path. Always requires both sequences:read and subscribers:read because results include contact samples.

## Path parameters

- `sequenceId` string, required

## Query parameters

- `subscriberId` string
- `email` string, email
- `limit` integer

## Response `200`

Sequence simulation

- object
  - `success` boolean, required
  - `sequenceId` string, required
  - `sequenceName` string
  - `status` string
  - `sendsMail` boolean, required
  - `enrollment` object, required — Who currently matches and the confirmation that nobody is auto-enrolled on activate.
  - `readiness` object, required — Activation blockers and warnings.
    - `ready` boolean
    - `errors` string[]
    - `warnings` string[]
  - `path` object, nullable — Walked graph for the optional stored subscriber. emailStepsOnPath counts traversed email nodes; emailsOnPath counts those deliverable for the subscriber's current email and status. Null when none was passed.

## Other responses

- `400` — Invalid query, such as supplying both subscriberId and email or a non-integer/out-of-range limit
- `401` — Unauthorized
- `403` — Missing sequences:read or subscribers:read API key scope
- `404` — Sequence or subscriber not found
- `503` — The database was temporarily unavailable. The request may be retried after the delay in Retry-After.

## Changes

- **2026-08-27** `7be6436bbf9a` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/sequenzy/apis/sequenzy-api/changes/sequences/:sequenceId/simulate/get.md)

---

[API](https://skmtc.dev/sequenzy/apis/sequenzy-api.md) · [All operations](https://skmtc.dev/sequenzy/apis/sequenzy-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/sequenzy/sequenzy-api/revisions/73f826277d9a/schema)