API overview

The API exposes the same rules-based equity construction model used by Tilt today, with a deliberately small public surface.

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Core model

A Tilt is a persistent project for one index methodology. Its construction rules describe how to select and weight securities, and each successful evaluation saves the constituents and weights those rules produced. For developers, a bounded analogy is a GitHub repository: construction rules are source, evaluated constituent snapshots are build artifacts, and methodology history is version history. The analogy does not imply branches, forks, merges, or cloning. Evaluating a Tilt does not publish an index. The existing version_group_sqid identifies the project across versions. A uuid addresses one particular draft or published version.

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Workflow

1. Search the construction catalog for exact field names and inspect fields before choosing thresholds.
2. List universe presets and create an unevaluated draft Tilt.
3. Resolve ticker overrides to exact tilt_asset_id values.
4. Apply the methodology. Tilt saves the rules, evaluates them, and commits the complete weighted constituent snapshot atomically.
5. Read the saved constituents or backtest the saved Tilt.

Applying construction is the evaluation operation. A separate evaluation endpoint, raw catalog listing, and named-index membership endpoint are outside the initial API scope.

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Scope

The preview includes the documented rules-based equity pipeline: universe, derived fields, selection, sizing, ticker overrides, rebalance cadence, concentration limits, complete weighted constituents, and synchronous backtesting. It excludes natural-language construction, research, enrichment creation, discretionary and event-contract Tilts, publication, and governance.