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Five small reference endpoints round out the surface:

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Fee schedule

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.

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Exchange rate-limit tiers

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.

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Exchange info

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.

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Collateral assets

curl "https://api.polynode.dev/v3/perps/assets?key=$POLYNODE_API_KEY"
Collateral token config (pUSD address, decimals, withdrawal fee).

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Index composition

curl "https://api.polynode.dev/v3/perps/index/BTC?key=$POLYNODE_API_KEY"
Index price and its constituent sources for an underlying asset.