Additional information
Precision and rounding
When interacting with Bridge’s APIs, it’s important to understand how we handle rounding, fees, and fractional cent precision to ensure your payments are processed smoothly and your customer receives the expected amount.
Key Policies
- Whole cent enforcement
Bridge only processes amounts that can be expressed in whole U.S. cents.
Even if the stablecoin supports more than two decimal places, Bridge will truncate the amount to the nearest cent. - Fractional Cents Are Discarded
Any fractional cent (e.g.,$100.119999) will be ignored, not processed or refunded. - Rounding Ensures Sufficient Balance
- Bridge will round fractional cent values in such a way to ensure that there will always be sufficient balance available to process your transaction.
- Bridge will always round in such a way to guarantee at least the minimum amount of fees that are owed to all parties, whether they be our developers or to Bridge.
Example Calculation
Let’s say you want to offramp $100,100.119999 USDT with a 10 bps developer fee (0.1%):- Bridge truncates to whole cents:
Note that USDT, like many other stablecoins, has 6 digits of precision. However, because Bridge only supports whole cents, we will first truncate this amount down to $100,100.11.
$100,100.119999 → rounded down to $100,100.11 - Bridge calculates developer fee:
0.1% of $100,100.11 = $100.10011 → rounded up to $100.11 - Customer receives:
$100,100.11 - $100.11 = $100,000.00
Working backwards from desired output
If you want your customer to receive a clean, round-dollar output, use this formula:Input Amount = Output Amount / 0.999
Then round up to the nearest cent to ensure fees are covered.
📐 Reference Table
These examples assume no developer fee and only standard Bridge exchange fees.
| Input Amount | Output Amount |
|---|---|
| $100.11 | $100.00 |
| $200.21 | $200.00 |
| $500.51 | $500.00 |
| $1,001.01 | $1,000.00 |
| $100,100.11 | $100,000.00 |
| $500,500.51 | $500,000.00 |