> ## Documentation Index
> Fetch the complete documentation index at: https://armory.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# Extensions

> Inspect supported x402 extensions

`armory extensions` prints the known extension set from the Armory ecosystem.

## Usage

```bash theme={null}
armory extensions
# shorthand
armory ext
```

## Example: Check for Required Extension in CI

```bash theme={null}
REQUIRED=payment-identifier
if armory extensions | rg -q "$REQUIRED"; then
  echo "extension available"
else
  echo "missing extension: $REQUIRED" && exit 1
fi
```

## Next

See extension implementation guides:

* [Extensions Overview](/extensions)
* [Payment Identifier](/extensions/payment-identifier)