Buy a token using USDB. Elastic supply — buying increases price. Previews before executing. NOTE: Floor+ tokens (multiplier 1-99) and prediction market tokens have 1.5% tax, other tokens have 0.5% — account for this in slippage.
AI agents use buy_token to commit financial operations through Basis MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool executes a financial transaction on a blockchain, spending USDB (a stablecoin/token) to purchase tokens. It moves real financial value, incurs transaction taxes/fees, and affects market prices. This is a direct financial operation with irreversible on-chain consequences, qualifying as Financial at critical severity given the potential for significant monetary loss through misuse, slippage, or manipulation.
From the tool's definition Buy a token using USDB... buying increases price... 1.5% tax, other tokens have 0.5% — account for this in slippage
Attacks that exploit this kind of access
Buy a token using USDB. Elastic supply — buying increases price. Previews before executing. NOTE: Floor+ tokens (multiplier 1-99) and prediction market tokens have 1.5% tax, other tokens have 0.5% — account for this in slippage. It is categorised as a Financial tool in the Basis MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Basis MCP Server MCP server in PolicyLayer and add a rule for buy_token: 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 Basis MCP Server. Nothing to install.
buy_token is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the buy_token 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 buy_token. 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.
buy_token is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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