Combined crypto market sentiment signal: Crypto Fear & Greed Index (alternative.me, 0–100, 30-day trend) plus BTC and ETH Implied Volatility from Deribit options market (annualized %). Free upstream sources, no keys. Returns current FGI value, classification (Extreme Fear to Extreme Greed), 7-day...
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AI agents call market-sentiment to retrieve information from The Stall 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 market-sentiment 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": {
"market-sentiment": {}
}
}See the full The Stall policy for all 105 tools.
These attack patterns abuse exactly the kind of access market-sentiment 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.
Combined crypto market sentiment signal: Crypto Fear & Greed Index (alternative.me, 0–100, 30-day trend) plus BTC and ETH Implied Volatility from Deribit options market (annualized %). Free upstream sources, no keys. Returns current FGI value, classification (Extreme Fear to Extreme Greed), 7-day FGI trend, IV trend (RISING/FALLING/FLAT), and a composite regime label (CAPITULATION_ZONE, OVERHEATED, COMPLACENT_GREED, CALM_MARKET, etc.). Use before making large DeFi positions, calibrating yield farming risk, or routing agent spend in volatile conditions.. It is categorised as a Read tool in the The Stall MCP Server, which means it retrieves data without modifying state.
Register the The Stall MCP server in PolicyLayer and add a rule for market-sentiment: 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 The Stall. Nothing to install.
market-sentiment 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 market-sentiment 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 market-sentiment. 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.
market-sentiment is provided by the The Stall MCP server (https://the-stall.intuitek.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 105 The Stall tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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