Get UTXO block details (Block Data product). Actions: • get-block-by-height: Get block details by block height (number) • get-block-by-hash: Get block details by block hash • list-transactions-by-block-height: List transactions in a block by block height • list-transactions-by-block-hash: List tr...
Part of the Mcp Block Data server.
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AI agents call utxo_block_data to retrieve information from Mcp Block Data 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_block_data 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_block_data": {}
}
}See the full Mcp Block Data policy for all 3 tools.
These attack patterns abuse exactly the kind of access utxo_block_data 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 UTXO block details (Block Data product). Actions: • get-block-by-height: Get block details by block height (number) • get-block-by-hash: Get block details by block hash • list-transactions-by-block-height: List transactions in a block by block height • list-transactions-by-block-hash: List transactions in a block by block hash • get-last-mined-block: Get the latest mined block details • list-latest-mined-blocks: List the latest mined blocks ${UTXO_BLOCKCHAIN_NETWORK_DESCRIPTION}. It is categorised as a Read tool in the Mcp Block Data MCP Server, which means it retrieves data without modifying state.
Register the Mcp Block Data MCP server in PolicyLayer and add a rule for utxo_block_data: 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 Block Data. Nothing to install.
utxo_block_data 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_block_data 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_block_data. 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_block_data is provided by the Mcp Block Data MCP server (@cryptoapis-io/mcp-block-data). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Mcp Block Data tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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