get_closest_block

GET /coins/block/{chain}/{timestamp}

SERVERREI Crypto MCP Server SOURCE0xreisearch/crypto-mcp-beta

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade B, identity unverified Pull the record →

WHAT IT DOES

What get_closest_block does on REI Crypto MCP Server

AI agents call get_closest_block to retrieve information from REI Crypto MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_closest_block is rated Low

This tool retrieves blockchain block information based on chain and timestamp parameters. It performs a straightforward data lookup operation without creating, modifying, deleting, or executing code. The GET method explicitly indicates read-only access. No financial transactions or destructive operations are involved. This is a typical Read-category data retrieval tool.

From the tool's definition Tool name 'get_closest_block' and description 'GET /coins/block/{chain}/{timestamp}' indicate a read-only query operation that retrieves block data for a given blockchain and timestamp.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_closest_block safely

PolicyLayer is an MCP gateway: it sits between your AI agents and REI Crypto MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_closest_block, this is the rule to start with:

get_closest_block Allowed

get_closest_block is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_closest_block": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect REI Crypto MCP Server, apply this rule, and every get_closest_block call is checked against it from then on.

FAQ

Questions about get_closest_block

What does the get_closest_block tool do? +

GET /coins/block/{chain}/{timestamp}. It is categorised as a Read tool in the REI Crypto MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_closest_block? +

Register the REI Crypto MCP Server MCP server in PolicyLayer and add a rule for get_closest_block: 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 REI Crypto MCP Server. Nothing to install.

What risk level is get_closest_block? +

get_closest_block is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_closest_block? +

Yes. Add a rate_limit block to the get_closest_block 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.

How do I block get_closest_block completely? +

Set action: deny in the PolicyLayer policy for get_closest_block. 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.

What MCP server provides get_closest_block? +

get_closest_block is provided by the REI Crypto MCP Server MCP server (0xreisearch/crypto-mcp-beta). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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