api_indexer_search_for_transactions

THE RISK

Low Risk

Why api_indexer_search_for_transactions needs a policy

This tool retrieves transaction data from an Algorand indexer based on filter criteria. It has no side effects, does not modify data, does not execute code or commands, and does not move funds. It is purely informational in nature, making it a Read category tool with low severity.

From the tool's definition Tool name contains 'search_for' and description states 'Search for transactions with various criteria' - both indicate querying/retrieval without modification or execution of external operations.

Documented attack patterns abuse exactly the kind of access api_indexer_search_for_transactions gives an agent:

POLICY

How to control api_indexer_search_for_transactions

PolicyLayer is an MCP gateway — it sits between your AI agents and Algorand MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for api_indexer_search_for_transactions:

policy.json

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

api_indexer_search_for_transactions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Algorand MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about api_indexer_search_for_transactions

What does the api_indexer_search_for_transactions tool do? +

Search for transactions with various criteria. It is categorised as a Read tool in the Algorand MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on api_indexer_search_for_transactions? +

Register the Algorand MCP server in PolicyLayer and add a rule for api_indexer_search_for_transactions: 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 Algorand MCP. Nothing to install.

What risk level is api_indexer_search_for_transactions? +

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

Can I rate-limit api_indexer_search_for_transactions? +

Yes. Add a rate_limit block to the api_indexer_search_for_transactions 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 api_indexer_search_for_transactions completely? +

Set action: deny in the PolicyLayer policy for api_indexer_search_for_transactions. 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 api_indexer_search_for_transactions? +

api_indexer_search_for_transactions is provided by the Algorand MCP server (goplausible/algorand-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Algorand MCP tool call.

Start from Algorand MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →