# Enforcement of Slippage Validation (/docs/changelog/active-notifications/enforcement-of-slippage-validation)

Posted: September 4, 2026 | Effective: October 4, 2026

On October 4, 2026, we will begin enforcing that every `/quote` request include either `autoSlippage` or `slippageTolerance`.

**What is changing?**

The [API Reference](/docs/api-reference/aggregator_quote) already documents that every `/quote` request must include either a `slippageTolerance` or an `autoSlippage` field. That requirement has not been enforced. Starting October 4, 2026, requests that omit both fields will be rejected.

**Why is this changing?**

This change ensures that integrators or their end users explicitly choose a slippage setting, rather than relying on an implicit default that may not match their intent.

**What do I need to do?**

If your `/quote` requests do not currently set `slippageTolerance` or `autoSlippage`, you must start setting one of them, as described in the [`/quote` API Reference](/docs/api-reference/aggregator_quote). If you already set one of these fields on each request, no change is required.