> For the complete documentation index, see [llms.txt](https://docs.decisionrules.io/doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.decisionrules.io/doc/api/rule-solver-api.md).

# Rule Solver API

The Rule Solver API solves a rule — a Decision Table, Decision Tree, Decision Flow or any other rule type — and returns the result in the same call.

Use **Rule Solver API v2**. It runs on the current solver, and all new features are released there.

**Rule Solver API v1** remains available for existing integrations. If you are still using it, **Rule Solver API Migration** shows how to move to new version.

{% content-ref url="/pages/dTwQ68snAI8vTxBIRzJr" %}
[Rule Solver API v2](/doc/api/rule-solver-api/rule-solver-api.md)
{% endcontent-ref %}

{% content-ref url="/pages/-MN5N6X1Z6NeH4Hht5ye" %}
[Rule Solver API v1](/doc/api/rule-solver-api/rule-solver-api-1.md)
{% endcontent-ref %}

{% content-ref url="/pages/a2Vb4vpVh5Seqr2c0vb0" %}
[Rule Solver API Migration](/doc/api/rule-solver-api/solver-version-migration.md)
{% endcontent-ref %}


---

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