Get Polymarket market/condition data including outcomes and volumes from the Main subgraph
Part of the Graph Polymarket MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call get_market_data to retrieve information from Graph Polymarket 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 get_market_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.
tools:
get_market_data:
rules:
- action: allowSee the full Graph Polymarket policy for all 31 tools.
Agents calling read-class tools like get_market_data have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Get Polymarket market/condition data including outcomes and volumes from the Main subgraph. It is categorised as a Read tool in the Graph Polymarket MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for get_market_data. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Graph Polymarket MCP server.
get_market_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 get_market_data rule in your Intercept 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 Intercept policy for get_market_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.
get_market_data is provided by the Graph Polymarket MCP server (graph-polymarket-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept