| Underlying | Effective Interest rate, defined as the average repurchase agreement (OC1) rates verified on the period between the trading day and the last trading day. |
| Ticker | OC1 |
| Contract size | Unit price (PU) times BRL1.00. The contract value 100,000 point at the maturity. |
| Quotation | Effective interest rate per annum, based on 252 business days, to three decimal places. |
| Tick size | 0.001 of an interest rate point from the 1st to the 3rd contract month; 0.005 of an interest rate point from the 4th to the 12th contract month; and 0.01 of an interest rate point for the other contract months. |
| Round-lot | 5 contracts. |
| Last trading day | Last trading day preceding the expiration date. |
| Expiration date | 1st business day of the contract month. |
| Contract months | All months. |
| Settlement on expiration | Cash settlement. |
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