Condition ID

Definition

A Condition ID is the on-chain identifier of a CTF condition used by the Gnosis Conditional Token Framework (CTF). It uniquely represents a conditioning event (for example, the question or oracle resolution tied to a market) and is required when performing CTF operations such as split, merge, and redeem.

In context

On Polymarket you encounter a condition id in API responses (for example, the Gamma /markets payload) and in the CTF calls that underlie market operations. When you split a complete set into outcome tokens, or later merge/redeem those tokens, the contract-level function calls reference the condition id so the CTF knows which conditional token set to mint or burn. The Condition ID therefore links Polymarket's market objects—questions, events, and series—to the ERC-1155 outcome tokens on-chain.

Practical notes

• The Condition ID is returned by Polymarket's Gamma API as part of market and event objects. Use the exact API endpoints documented by Polymarket to retrieve it.
• When automating CTF operations (split/merge/redeem), the Condition ID is a required parameter for the contract call.
• The Condition ID is a canonical on-chain identifier; treat it as immutable for the corresponding condition. Do not assume it encodes human-readable data.

See also

• /glossary/ctf