---
title: "Sets the fast bid multiplier for a single external booster campaign to an arbitrary value."
method: PUT
path: "/campaign/boost/{externalCampaignId}/fast-bid-multiplier"
tags: ["Campaign"]
---

# Sets the fast bid multiplier for a single external booster campaign to an arbitrary value.

`PUT /campaign/boost/{externalCampaignId}/fast-bid-multiplier`

Bypasses the level→multiplier mapping. Intended for live testing and one-off
 operational tweaks. Value must be in [0, 50]; 0 effectively pauses delivery on the
 campaign without changing its status. The response reports the multiplier the
 downstream system confirms is applied.

## Path parameters

- `externalCampaignId` integer, required

## Request body

- SetFastBidMultiplierEndpointInput
  - `multiplier` number, double, required — The bid multiplier to apply. Must be in [0, 50].

## Response `200`

OK

- SetFastBidMultiplierEndpointOutput
  - `externalCampaignId` integer, required — The external campaign id reported by the downstream system.
  - `appliedMultiplier` number, double, required — The bid multiplier the downstream system reports as currently applied.

## Other responses

- `400` — Bad Request
- `401` — Unauthenticated
- `403` — Forbidden

---

[API](https://skmtc.net/rapidata/apis/rapidata-api.md) · [All operations](https://skmtc.net/rapidata/apis/rapidata-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/rapidata/rapidata-api/revisions/e42ec51c7b88/schema)