# GrowthBook Holdouts API

**Canonical:** https://apis.io/apis/growthbook/growthbook-holdouts-api/  
**Provider:** GrowthBook — https://apis.io/providers/growthbook/  
**Base URL:** https://api.growthbook.io/api  
**Documentation:** https://docs.growthbook.io/api

GrowthBook Holdouts API is one of 51 APIs that [GrowthBook](https://apis.io/providers/growthbook/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Holdouts. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

Hold a share of traffic out of all experiments to measure their combined effect.

## Operations (7)

| Method | Path | Summary |
|---|---|---|
| GET | `/v1/holdouts/{id}` | Get a single holdout |
| PUT | `/v1/holdouts/{id}` | Update a single holdout |
| POST | `/v1/holdouts` | Create a single holdout |
| GET | `/v1/holdouts` | Get all holdouts |
| POST | `/v1/holdouts/{id}/start` | Start the Holdout's Active Period |
| POST | `/v1/holdouts/{id}/start-analysis` | Start the Holdout's Analysis Period |
| POST | `/v1/holdouts/{id}/stop` | Stop a Holdout |

## Machine-readable artifacts (2)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/growthbook/refs/heads/main/openapi/growthbook-holdouts-api-openapi.yml
- **Documentation** — https://docs.growthbook.io/api

## Other GrowthBook APIs (12)

- [GrowthBook AnalyticsExplorations API](https://apis.io/apis/growthbook/growthbook-analyticsexplorations-api/)
- [GrowthBook Archetypes API](https://apis.io/apis/growthbook/growthbook-archetypes-api/)
- [GrowthBook Attributes API](https://apis.io/apis/growthbook/growthbook-attributes-api/)
- [GrowthBook Code References API](https://apis.io/apis/growthbook/growthbook-code-references-api/)
- [GrowthBook Dashboards API](https://apis.io/apis/growthbook/growthbook-dashboards-api/)
- [GrowthBook Data Sources API](https://apis.io/apis/growthbook/growthbook-data-sources-api/)
- [GrowthBook Dimensions API](https://apis.io/apis/growthbook/growthbook-dimensions-api/)
- [GrowthBook Environments API](https://apis.io/apis/growthbook/growthbook-environments-api/)
- [GrowthBook Experiments API](https://apis.io/apis/growthbook/growthbook-experiments-api/)
- [GrowthBook Fact Metrics API](https://apis.io/apis/growthbook/growthbook-fact-metrics-api/)
- [GrowthBook Fact Tables API](https://apis.io/apis/growthbook/growthbook-fact-tables-api/)
- [GrowthBook Feature Revisions API](https://apis.io/apis/growthbook/growthbook-feature-revisions-api/)

## Tags

Holdouts

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/growthbook/growthbook-holdouts-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/growthbook/.