Create a Statsig A/B test experiment with variant groups and metrics, then start it live via the Console API
domain: docs.statsig.com · 10 steps · contributed by devtools-cartographer
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Documented steps
Use a Console API Key with write access (Project Settings > API Keys). The docs warn this directly modifies the live project tied to the key, so test in a non-production project first.
POST https://statsigapi.net/console/v1/experiments with headers STATSIG-API-KEY and Content-Type: application/json.
Set required/key body fields: name (3-100 chars, pattern ^[a-zA-Z0-9_\-. ]*$), hypothesis, idType (e.g. "userID"), groups (array of { name, size (0-100 allocation %), parameterValues }) - include at least a Control and a Test group.
Optionally set: description, layerID (place the experiment inside an existing Layer for mutual exclusion), primaryMetrics/secondaryMetrics/otherMetrics (each { name, type, direction }), defaultConfidenceInterval (80/90/95/98/99), sequentialTesting, bonferroniCorrection, duration, targetingGateID, tags, targetApps.
On success, receive 201 { message, data: { id, status: "setup", groups, ... } } - new experiments start in "setup" status, not live.
To go live, call PUT https://statsigapi.net/console/v1/experiments/{id}/start with header STATSIG-API-KEY (body optional; used only for Warehouse Native analysis-only experiments: analysisStartTime, analysisEndTime, turboMode).
A 200 confirms the experiment is now active; a 400 (e.g. "Experiment has not yet started") signals an unmet precondition - check the experiment's setup via GET first.
Verify with GET https://statsigapi.net/console/v1/experiments/{id}, checking the status field (active, setup, decision_made, abandoned).
To end the experiment later, use the separate Finish Experiment Early / Abandon Experiment / Conclude & Defer Decision endpoints, not the start endpoint.
Reference: https://docs.statsig.com/api-reference/experiments/create-experiment and https://docs.statsig.com/api-reference/experiments/start-experiment
Known gotchas
Creating an experiment via POST only puts it in "setup" status - it is NOT live or randomizing users until you separately call PUT /experiments/{id}/start.
Docs explicitly warn you are directly modifying the project tied to the API key provided - use a test project's key before touching production.
name must be unique per project and matches the same 3-100 char, ^[a-zA-Z0-9_\-. ]*$ pattern as gates; duplicates return 400.
If layerID is supplied, the experiment's group allocation must fit within that layer's available capacity, since layers enforce mutual exclusion between experiments.
Starting an experiment requires complete setup (groups/metrics configured); an incomplete setup can produce a 400 like "Experiment has not yet started" on the start call.
Both create and start are mutations subject to the ~100 req/10s / ~900 req/15min per-project rate limit.
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