Send a transaction to a smart contract on any EVM-compatible chain (requires private key)
AI agents use send-transaction to commit financial operations through Blockchain MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Sending blockchain transactions can move funds, interact with DeFi contracts, or commit financial obligations on-chain. These actions are irreversible once mined and can result in direct financial loss. The requirement for a private key confirms real asset control. This is the highest-severity Financial category tool.
From the tool's definition 'Send a transaction to a smart contract on any EVM-compatible chain (requires private key)'
Attacks that exploit this kind of access
Send a transaction to a smart contract on any EVM-compatible chain (requires private key). It is categorised as a Financial tool in the Blockchain MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Blockchain MCP Server MCP server in PolicyLayer and add a rule for send-transaction: 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 Blockchain MCP Server. Nothing to install.
send-transaction 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 send-transaction 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 send-transaction. 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.
send-transaction is provided by the Blockchain MCP Server MCP server (lienhage/blockchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
send-transaction is one line of Blockchain MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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