> For the complete documentation index, see [llms.txt](https://docs.lumia.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lumia.org/ecosystem/bridges.md).

# Bridges

**Who this is for:** developers and users who need to move assets or messages between Lumia and another chain, and want to know which mechanism applies.

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Native Lumia bridge</strong></td><td>The default path for moving assets between Ethereum and Lumia.</td><td><a href="https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/build-on-lumia/bridge/bridge-assets-to-from-lumia-l2">https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/build-on-lumia/bridge/bridge-assets-to-from-lumia-l2</a></td></tr><tr><td><strong>Shared settlement layer</strong></td><td>Lumia is a member of Polygon's shared AggLayer settlement layer.</td><td><a href="https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/how-lumia-settles-and-bridges-to-ethereum">https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/how-lumia-settles-and-bridges-to-ethereum</a></td></tr><tr><td><strong>Interchain messaging</strong></td><td>Hyperlane provides interchain messaging as part of Lumia's interoperability stack.</td><td><a href="https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/interoperability/cross-chain-messaging-with-hyperlane">https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/interoperability/cross-chain-messaging-with-hyperlane</a></td></tr></tbody></table>

### Which mechanism applies to which route

Each mechanism covers a different pair of endpoints.

```mermaid
flowchart LR
  E["Ethereum"] -- "deposit, native Lumia bridge" --> LU["Lumia"]
  LU -- "withdraw, native Lumia bridge" --> E
  LU -- "shared settlement layer" --> AG["Polygon CDK chains, via AggLayer"]
  LU -- "interchain messages" --> HY["Other chains, via Hyperlane"]
```

The diagram shows which mechanism covers which route, not how long a transfer takes on any of them.

### Native Lumia bridge

This is the default path for moving assets between Ethereum and Lumia. Walkthrough: [`/build/bridge/bridge-to-lumia`](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/build-on-lumia/bridge/bridge-assets-to-from-lumia-l2) (developer version) or [`/use/bridge/bridge-guide`](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/use-lumia/bridge/bridging-assets-user-guide) (plain-language version).

### Shared settlement layer

The shared settlement layer Lumia uses, which also connects it to the other CDK chains. Concept and role on Lumia: [`/lumia/architecture/polygon/agglayer`](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/how-lumia-settles-and-bridges-to-ethereum).

### Interchain messaging

Hyperlane is a general-purpose interchain-messaging protocol, used as part of Lumia's interoperability stack.

Details: [`/lumia/architecture/interoperability/hyperlane`](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/interoperability/cross-chain-messaging-with-hyperlane).