diff --git a/features/deposit-addresses.mdx b/features/deposit-addresses.mdx
index b4070d3..4896f34 100644
--- a/features/deposit-addresses.mdx
+++ b/features/deposit-addresses.mdx
@@ -62,7 +62,7 @@ Strict deposit addresses are bound to the original order and should be treated a
 | Wrong token (non-solver) | Not supported in the normal fill flow; may require manual recovery | Not supported in the normal fill flow |
 | Wrong chain (same VM) | Auto-reroute on EVM; other chain families may refund | Not supported |
 | Wrong chain (different VM) | Not possible — address formats differ | Not possible — address formats differ |
-| Amount mismatch | Usually requotes for actual amount; too-small deposits may refund | Exact payment expected |
+| Amount mismatch | Usually requotes for actual amount; too-small deposits may refund | Underpayments refund; exact payments fill; overpayments fill the quoted amount and refund the excess |
 | `refundTo` | Recommended (omitting disables automatic refund) | Required |
 | Address reuse | Yes, same route | No — bound to original order |
 
@@ -891,7 +891,8 @@ This is not possible — deposit address formats differ across VM types (e.g., E
 Strict addresses are bound to the original order. The handling is narrower:
 
 - **Exact amount** — The fill proceeds using the original order.
-- **Amount mismatch** — The deposit may fail and be refunded to `refundTo`. Send the exact quoted amount.
+- **Underpayment** — The deposit fails and is refunded to `refundTo`. The fill does not proceed.
+- **Overpayment** — The fill proceeds for the originally quoted amount and the excess is returned to `refundTo` as a separate refund leg. The fill itself is never scaled up.
 - **Wrong token or wrong chain** — Not supported. Strict addresses do not have automatic wrong-token or wrong-chain recovery paths.
 
 <Warning>
diff --git a/references/api/changelog.mdx b/references/api/changelog.mdx
index d81d578..2e2075a 100644
--- a/references/api/changelog.mdx
+++ b/references/api/changelog.mdx
@@ -3,6 +3,10 @@ title: "API Changelog"
 description: "Record of breaking changes, deprecations, and notable additions to the Relay API"
 ---
 
+## 2026-05-07 — Strict deposit-address overpayments now refund the excess
+
+**Behavior change** — `POST /quote/v2` with `useDepositAddress: true` and `strict: true`: a deposit larger than the quoted `amount` now fills the quoted amount and refunds the excess to `refundTo` in a separate refund leg, instead of scaling the fill up to the deposited amount. Exact payments still fill normally and underpayments still fail and refund. `refundTo` remains required for strict deposit addresses.
+
 ## 2026-04-28 — Same-chain dust swaps reject at quote time
 
 **Breaking** — `POST /quote/v2`: same-chain swap requests whose quoted USD value is greater than `0` and less than `$0.05` now return `400` with `errorCode: "AMOUNT_TOO_LOW"`. Previously these requests returned `200` with calldata that reverted on-chain. Wrap and unwrap quotes (e.g. same-chain `ETH` ↔ `WETH`) and quotes that include attached calls continue to be accepted at any size.
\ No newline at end of file