> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polynode.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Fees & Exchange Meta

> Fee schedule, exchange rate-limit tiers, contract info, collateral assets, and index composition.

Five small reference endpoints round out the surface:

## Fee schedule

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/fees?key=$POLYNODE_API_KEY"
```

Tiered maker/taker rates by 30-day volume, per instrument category (equity instruments carry different rates than crypto/index/commodity). Base tier is 4 bps taker / 1.25 bps maker.

## Exchange rate-limit tiers

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/limit-tiers?key=$POLYNODE_API_KEY"
```

Polymarket's exchange-level trading limits by 14-day volume. Informational — your polynode rate limits are documented [here](/perps/rate-limits).

## Exchange info

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/exchange?key=$POLYNODE_API_KEY"
```

EIP-712 domain and custody contract details for the perps exchange on Polygon.

## Collateral assets

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/assets?key=$POLYNODE_API_KEY"
```

Collateral token config (pUSD address, decimals, withdrawal fee).

## Index composition

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/index/BTC?key=$POLYNODE_API_KEY"
```

Index price and its constituent sources for an underlying asset.