---
title: "Stop participant"
method: POST
path: "/api/v1/initiatives/{id}/participants/{participantId}/stop"
tags: ["Initiatives"]
---

# Stop participant

`POST /api/v1/initiatives/{id}/participants/{participantId}/stop`

## Request

- Base URL: `https://www.useboom.ai`
- URL: `https://www.useboom.ai/api/v1/initiatives/{id}/participants/{participantId}/stop`
- Auth: HTTP bearer

End one participant’s run: no further scheduled messages are sent and their session is closed. Idempotent and safe — it never sends. Their answers and transcript stay readable, and the conversation keeps whoever it was assigned to.

## Path parameters

- `id` string, required: Initiative id.
- `participantId` string, required: Participant id, as returned when adding or listing.

## Response `200`

Success

- object
  - `stopped` true, required
  - `status` 'ACTIVE' | 'COMPLETED' | 'STOPPED' | 'EXPIRED' | 'FAILED', required: ACTIVE (conversation may still happen), COMPLETED, STOPPED (messaging halted), EXPIRED, or FAILED.

## Other responses

- `400`: Validation failed or the request cannot proceed.
- `401`: Missing, malformed, or revoked API key.
- `404`: The resource does not exist in this organization.
- `409`: Conflicts with the current state (duplicates, wrong lifecycle state).
- `422`: The request is well-formed but semantically invalid.
- `429`: Rate limit exceeded — retry after `Retry-After`.
- `500`: Internal server error.
- `503`: Transient error — retry with a narrower request.

---

[API](https://skmtc.dev/useboom/apis/boom-api.md) - [All operations](https://skmtc.dev/useboom/apis/boom-api/llms.txt) - [OpenAPI document](https://skmtc.dev/useboom/apis/boom-api/revisions/d596d92ed092?raw)