Recent successful txs to a contract grouped by selector, with per-slot calldata samples + type hints. For reverse-engineering ABIs of unverified contracts. Requires ETHERSCAN_API_KEY.
Part of the Kosyak Evm server.
Free to start. No card required.
AI agents call find_recent_calls to retrieve information from Kosyak Evm 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 find_recent_calls 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": {
"find_recent_calls": {}
}
}See the full Kosyak Evm policy for all 50 tools.
These attack patterns abuse exactly the kind of access find_recent_calls 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.
Recent successful txs to a contract grouped by selector, with per-slot calldata samples + type hints. For reverse-engineering ABIs of unverified contracts. Requires ETHERSCAN_API_KEY.. It is categorised as a Read tool in the Kosyak Evm MCP Server, which means it retrieves data without modifying state.
Register the Kosyak Evm MCP server in PolicyLayer and add a rule for find_recent_calls: 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 Kosyak Evm. Nothing to install.
find_recent_calls 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 find_recent_calls 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 find_recent_calls. 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.
find_recent_calls is provided by the Kosyak Evm MCP server (kosyak-evm-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 50 Kosyak Evm tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.