# get_overview_dexs__by_chain

List all dexs along with summaries of their volumes and dataType history data filtering by chain

Agent View of the PolicyLayer registry record for `get_overview_dexs__by_chain`. HTML page: https://policylayer.com/tools/defillama/get-overview-dexs--by-chain

## Facts

- Tool: `get_overview_dexs__by_chain`
- Server: Defillama (`@nic0xflamel/defillama-mcp-server`) — https://policylayer.com/tools/defillama.md
- Install: `npx -y @nic0xflamel/defillama-mcp-server`
- Homepage: git+https://github.com/nic0flamel/notion-automation.git
- Risk category: Read (Low risk)
- Registry record: grade B, identity unverified
- Server rate-limited: no
- Parameters: 3 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `chain` | string | yes | chain name, list of all supported chains can be found under allChains attribute in /overview/dexs response |
| `excludeTotalDataChart` | boolean | no | true to exclude aggregated chart from response |
| `excludeTotalDataChartBreakdown` | boolean | no | true to exclude broken down chart from response |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_overview_dexs__by_chain",
    "arguments": {
      "chain": "<chain>"
    }
  }
}
```

## Why get_overview_dexs__by_chain is rated Low

This tool retrieves DEX overview information filtered by chain. It is a read-only data query operation that returns existing data from the DefiLlama API with no capability to modify, execute code, delete data, or move funds. The blast radius of misuse is minimal — an agent could only retrieve more data than intended, which poses low risk.

From the tool's own definition: "Tool name contains 'get_overview' and description states 'List all dexs along with summaries' — purely retrieves and queries data without modification or side effects. No mentions of write, execute, or delete operations."

## Use case

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

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Defillama:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_overview_dexs__by_chain": {}
  }
}
```

## Other tools on Defillama (13)

- `get_chart__by_pool` — Read — https://policylayer.com/tools/defillama/get-chart--by-pool.md
- `get_overview_dexs` — Read — https://policylayer.com/tools/defillama/get-overview-dexs.md
- `get_overview_fees` — Read — https://policylayer.com/tools/defillama/get-overview-fees.md
- `get_overview_fees__by_chain` — Read — https://policylayer.com/tools/defillama/get-overview-fees--by-chain.md
- `get_pools` — Read — https://policylayer.com/tools/defillama/get-pools.md
- `get_protocols` — Read — https://policylayer.com/tools/defillama/get-protocols.md
- `get_stablecoincharts_all` — Read — https://policylayer.com/tools/defillama/get-stablecoincharts-all.md
- `get_summary_dexs__by_protocol` — Read — https://policylayer.com/tools/defillama/get-summary-dexs--by-protocol.md
- `get_summary_fees__by_protocol` — Read — https://policylayer.com/tools/defillama/get-summary-fees--by-protocol.md
- `get_tvl__by_protocol` — Read — https://policylayer.com/tools/defillama/get-tvl--by-protocol.md
- `get_v2_chains` — Read — https://policylayer.com/tools/defillama/get-v2-chains.md
- `get_v2_historicalChainTvl` — Read — https://policylayer.com/tools/defillama/get-v2-historicalchaintvl.md
- `get_v2_historicalChainTvl__by_chain` — Read — https://policylayer.com/tools/defillama/get-v2-historicalchaintvl--by-chain.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=defillama · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/defillama