api_indexer_lookup_asset_balances

WHAT IT DOES

What api_indexer_lookup_asset_balances does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents call api_indexer_lookup_asset_balances to retrieve information from Sperax Ecosystem Crypto & DeFI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why api_indexer_lookup_asset_balances needs a policy

This is a pure data retrieval function that queries account balances for a given asset. It has no side effects, does not execute code or external operations, does not modify data, and does not move funds. The operation is read-only and poses minimal risk even if an AI agent misuses it — the worst outcome would be accessing publicly available blockchain balance information.

From the tool's definition Tool name contains 'lookup' and description states 'Get accounts holding this asset and their balances' — a query operation that retrieves data without modifying or executing anything.

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

POLICY

How to control api_indexer_lookup_asset_balances

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for api_indexer_lookup_asset_balances:

policy.json

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

api_indexer_lookup_asset_balances 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 Sperax Ecosystem Crypto & DeFI MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

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 →
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FAQ

Questions about api_indexer_lookup_asset_balances

What does the api_indexer_lookup_asset_balances tool do? +

Get accounts holding this asset and their balances. It is categorised as a Read tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on api_indexer_lookup_asset_balances? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for api_indexer_lookup_asset_balances: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is api_indexer_lookup_asset_balances? +

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

Can I rate-limit api_indexer_lookup_asset_balances? +

Yes. Add a rate_limit block to the api_indexer_lookup_asset_balances 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_lookup_asset_balances completely? +

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

api_indexer_lookup_asset_balances is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.