Get your chain-abstracted balance (CAB) -- a unified view of your tokens across all EVM chains. Shows total USDC, USDT, WETH, ETH across Base, Ethereum, Arbitrum, Polygon, BSC, Avalanche, and Tempo.
Part of the Clawvault server.
Free to start. No card required.
AI agents call get_cab_balance to retrieve information from Clawvault without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_cab_balance only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_cab_balance": {}
}
}See the full Clawvault policy for all 45 tools.
These attack patterns abuse exactly the kind of access get_cab_balance gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get your chain-abstracted balance (CAB) -- a unified view of your tokens across all EVM chains. Shows total USDC, USDT, WETH, ETH across Base, Ethereum, Arbitrum, Polygon, BSC, Avalanche, and Tempo.. It is categorised as a Read tool in the Clawvault MCP Server, which means it retrieves data without modifying state.
Register the Clawvault MCP server in PolicyLayer and add a rule for get_cab_balance: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Clawvault. Nothing to install.
get_cab_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_cab_balance rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for get_cab_balance. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
get_cab_balance is provided by the Clawvault MCP server (clawvault-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 45 Clawvault tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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