> For the complete documentation index, see [llms.txt](https://docs.bloxchain.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bloxchain.app/platform-bloxchain.app/overview-1/execution-ports.md).

# Execution ports

**Audience:** Admin · **App path:** Deployment → **Execution ports**

Review and configure **handler / port grants** for operations with multi-step or external execution graphs.

Essential for [External protocol calls](/platform-bloxchain.app/use-cases/external-calls.md). Pair with [Contract targets](/platform-bloxchain.app/overview-1/allowlists.md) allowlists.

## Steps

1. Open **Deployment → Execution ports**.
2. Select an operation that shows registered **handlers** (often `execute(bytes)` or composed flows).
3. Review the workflow diagram — confirms which selectors chain together.
4. Grant port permissions per role if the UI exposes port-level grants (same **Sign** → **Execute** pattern as other config).
5. Whitelist every external contract the flow calls under [Allowlists → Contract targets](/platform-bloxchain.app/overview-1/allowlists.md).
6. Test with a small request to an allowlisted target.

## Verify it worked

* Allowlisted target succeeds; non-allowlisted target reverts on-chain.

## Next steps

* [Connect your application](/platform-bloxchain.app/overview-1/connect-your-application.md)
* [Guard controller](/protocol/guard-controller.md) · [Meta-transactions](/protocol/meta-transactions.md)


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