Query UTXO address full history (requires synced address). Pagination: • list-transactions, list-transactions-by-timestamp: cursor pagination (use
Part of the Mcp Address History server.
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AI agents call utxo_address_history to retrieve information from Mcp Address History 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 utxo_address_history 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": {
"utxo_address_history": {}
}
}See the full Mcp Address History policy for all 4 tools.
These attack patterns abuse exactly the kind of access utxo_address_history 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.
Query UTXO address full history (requires synced address). Pagination: • list-transactions, list-transactions-by-timestamp: cursor pagination (use. It is categorised as a Read tool in the Mcp Address History MCP Server, which means it retrieves data without modifying state.
Register the Mcp Address History MCP server in PolicyLayer and add a rule for utxo_address_history: 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 Mcp Address History. Nothing to install.
utxo_address_history 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 utxo_address_history 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 utxo_address_history. 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.
utxo_address_history is provided by the Mcp Address History MCP server (@cryptoapis-io/mcp-address-history). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Mcp Address History tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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