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

# Asset

```ts theme={null}
type Asset = string;
```

Defined in: [guardrails/types.ts:9](https://github.com/coinbase/cdp-sdk/blob/a1195adcfa5a93627bd3cb79831b188cc13073a1/typescript/packages/cdp-sdk/src/x402/guardrails/types.ts#L9)

An asset identifier — typically an ERC-20 contract address or a Solana SPL mint address.