Amplitude Experiment API
Provides programmatic control over Amplitude Experiment's feature flags and A/B tests — evaluating flag variants for users, managing experiment configurations, and retrieving experiment results integrated with Amplitude Analytics.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Two separate key types (deployment vs management) provide some separation of privilege. Neither key type has fine-grained permission scopes. TLS enforced. Deployment keys should be treated as sensitive as they control feature exposure.
⚡ Reliability
Best When
Best when an agent is already working within the Amplitude ecosystem and needs to manage feature flags or retrieve experiment results that are natively integrated with Amplitude Analytics behavioral data.
Avoid When
Avoid when you need sophisticated multi-variate experimentation with advanced statistical methods, or when your analytics stack does not include Amplitude and you want flag management independent of a specific analytics vendor.
Use Cases
- • Evaluate feature flag variants for a specific user at request time to gate feature access in a backend service without round-tripping to the Amplitude SDK
- • Fetch experiment assignment results for a cohort of users to analyze conversion lift and statistical significance in a data pipeline
- • Create or update feature flag configurations programmatically as part of a CI/CD deployment workflow with gradual rollout logic
- • List all active experiments and their current allocation percentages to generate a flag hygiene audit and identify stale experiments
- • Retrieve raw experiment exposure events to feed into a custom analysis pipeline alongside other behavioral data in the warehouse
Not For
- • General product analytics (events, funnels, retention) — use the Amplitude Analytics API for behavioral queries; Amplitude Experiment is specifically for flag evaluation and A/B testing
- • Multi-armed bandit or adaptive experimentation at scale — Amplitude Experiment supports basic A/B and feature flags but is not a specialized Bayesian optimization platform
- • Cross-platform experiments independent of Amplitude Analytics — Amplitude Experiment is tightly coupled to the Amplitude ecosystem; LaunchDarkly or Statsig are better choices if you need standalone flag management
Interface
Authentication
Two separate key types: Deployment keys (for client/server-side flag evaluation) and Management API keys (for creating and managing experiments). Management API keys are generated per project in the Amplitude settings.
Pricing
Amplitude Experiment pricing is bundled with Amplitude Analytics plans — you cannot purchase Experiment standalone without an Amplitude account.
Agent Metadata
Known Gotchas
- ⚠ Remote evaluation silently returns the fallback/default variant when a flag key does not exist or the user does not match any targeting rules — agents cannot distinguish 'flag not found' from 'user in control group' without checking the variant reason field
- ⚠ Management API keys and Deployment keys are completely separate credentials with different base URLs — agents that confuse the two get authentication errors that can be hard to diagnose
- ⚠ Experiment results and analytics data have a processing lag of up to 24 hours; agents querying recent experiment exposures may see incomplete data
- ⚠ Mutual exclusion groups and holdout groups can cause users to be excluded from experiments silently — agents auditing assignment rates need to account for this and check exclusion group configurations
- ⚠ Flag evaluation caches variants client-side in the SDK; server-side remote evaluation avoids this but adds per-request latency — agents choosing between local and remote evaluation need to understand this trade-off explicitly
Alternatives
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Scores are editorial opinions as of 2026-03-07.