diff --git a/src/client/trades.rs b/src/client/trades.rs
index d7eaf2f..2ebe11c 100644
--- a/src/client/trades.rs
+++ b/src/client/trades.rs
@@ -3,7 +3,7 @@
 use alloy::primitives::{Address, B256, Bytes, I256, U256};
 use alloy::sol_types::SolEvent;
 
-use crate::constants::{MIN_OPENING_MARGIN, TICK_SPACING};
+use crate::constants::{MAX_TICK, MIN_OPENING_MARGIN, MIN_TICK, TICK_SPACING};
 use crate::contracts::{IERC20, Perp};
 use crate::convert::{scale_from_6dec, scale_to_6dec};
 use crate::errors::{ContractError, Result, ValidationError};
@@ -161,7 +161,7 @@ impl PerpClient {
         let tick_lower = align_tick_down(price_to_tick(params.price_lower)?, TICK_SPACING);
         let tick_upper = align_tick_up(price_to_tick(params.price_upper)?, TICK_SPACING);
 
-        if tick_lower >= tick_upper {
+        if tick_lower < MIN_TICK || tick_upper > MAX_TICK || tick_lower >= tick_upper {
             return Err(ValidationError::InvalidTickRange {
                 lower: tick_lower,
                 upper: tick_upper,
diff --git a/src/constants.rs b/src/constants.rs
index 89c271b..e779de4 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -40,17 +40,17 @@ pub const MIN_OPENING_MARGIN: u32 = 5_000_000;
 /// Funding interval in seconds (1 day).
 pub const INTERVAL: u64 = 86_400;
 
-/// sqrt(0.001) * 2^96 — the minimum allowed sqrtPriceX96.
-pub const MIN_SQRT_PRICE_X96: U256 = uint!(2505414483750479311864138016_U256);
+/// sqrt(1e-6) * 2^96 — the minimum starting sqrtPriceX96 accepted by the factory.
+pub const MIN_SQRT_PRICE_X96: U256 = uint!(79228162514264337593543951_U256);
 
-/// sqrt(1000) * 2^96 — the maximum allowed sqrtPriceX96.
-pub const MAX_SQRT_PRICE_X96: U256 = uint!(2505414483750479311864138015696_U256);
+/// sqrt(1e6) * 2^96 — the maximum starting sqrtPriceX96 accepted by the factory.
+pub const MAX_SQRT_PRICE_X96: U256 = uint!(79228162514264337593543950336000_U256);
 
-/// Minimum tick (~= TickMath.getTickAtSqrtPrice(MIN_SQRT_PRICE_X96)).
-pub const MIN_TICK: i32 = -69_090;
+/// Minimum allowed maker tick, slightly below the factory's minimum starting price.
+pub const MIN_TICK: i32 = -138_180;
 
-/// Maximum tick (~= TickMath.getTickAtSqrtPrice(MAX_SQRT_PRICE_X96)).
-pub const MAX_TICK: i32 = 69_090;
+/// Maximum allowed maker tick, slightly above the factory's maximum starting price.
+pub const MAX_TICK: i32 = 138_180;
 
 /// Total supply of the internal accounting token: type(uint120).max.
 pub const ACCOUNTING_TOKEN_SUPPLY: U256 = U256::from_limbs([u64::MAX, u64::MAX >> 8, 0, 0]); // 2^120 - 1
@@ -125,13 +125,13 @@ mod tests {
 
     #[test]
     fn min_sqrt_price_x96_matches_contract() {
-        let expected = U256::from_str_radix("2505414483750479311864138016", 10).unwrap();
+        let expected = U256::from_str_radix("79228162514264337593543951", 10).unwrap();
         assert_eq!(MIN_SQRT_PRICE_X96, expected);
     }
 
     #[test]
     fn max_sqrt_price_x96_matches_contract() {
-        let expected = U256::from_str_radix("2505414483750479311864138015696", 10).unwrap();
+        let expected = U256::from_str_radix("79228162514264337593543950336000", 10).unwrap();
         assert_eq!(MAX_SQRT_PRICE_X96, expected);
     }
 }
diff --git a/src/convert.rs b/src/convert.rs
index 7b1166b..85a7eda 100644
--- a/src/convert.rs
+++ b/src/convert.rs
@@ -286,7 +286,7 @@ pub fn sqrt_price_x96_to_price(sqrt_price_x96: U256) -> Result<f64, ValidationEr
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::constants::{MAX_SQRT_PRICE_X96, MIN_SQRT_PRICE_X96, Q96_PRECISION};
+    use crate::constants::{MAX_SQRT_PRICE_X96, Q96_PRECISION};
 
     // ── scale_to_6dec ──────────────────────────────────────────────
 
@@ -587,15 +587,15 @@ mod tests {
 
     #[test]
     fn price_very_small_works() {
-        // 0.001 is at the protocol minimum
-        let result = price_to_sqrt_price_x96(0.001);
+        // 1e-6 is the protocol's minimum starting price.
+        let result = price_to_sqrt_price_x96(1e-6);
         assert!(result.is_ok());
     }
 
     #[test]
-    fn price_1000_works() {
-        // 1000 is at the protocol maximum
-        let result = price_to_sqrt_price_x96(1000.0);
+    fn price_1e6_works() {
+        // 1e6 is the protocol's maximum starting price.
+        let result = price_to_sqrt_price_x96(1e6);
         assert!(result.is_ok());
     }
 
@@ -624,23 +624,13 @@ mod tests {
         assert!(sqrt_price_x96_to_price(U256::ZERO).is_err());
     }
 
-    #[test]
-    fn sqrt_price_x96_protocol_min() {
-        // MIN_SQRT_PRICE_X96 corresponds to price ≈ 0.001
-        let price = sqrt_price_x96_to_price(MIN_SQRT_PRICE_X96).unwrap();
-        assert!(
-            (price - 0.001).abs() < Q96_PRECISION,
-            "MIN_SQRT_PRICE_X96 gave price={price}, expected ≈0.001"
-        );
-    }
-
     #[test]
     fn sqrt_price_x96_protocol_max() {
-        // MAX_SQRT_PRICE_X96 corresponds to price ≈ 1000
+        // MAX_SQRT_PRICE_X96 corresponds to price ≈ 1e6.
         let price = sqrt_price_x96_to_price(MAX_SQRT_PRICE_X96).unwrap();
         assert!(
-            (price - 1000.0).abs() < Q96_PRECISION,
-            "MAX_SQRT_PRICE_X96 gave price={price}, expected ≈1000"
+            (price - 1e6).abs() < Q96_PRECISION,
+            "MAX_SQRT_PRICE_X96 gave price={price}, expected ≈1e6"
         );
     }
 
@@ -650,7 +640,7 @@ mod tests {
     fn price_sqrt_price_x96_roundtrip() {
         // Test a range of prices. The 6-decimal intermediate means we
         // lose precision at around 1e-6 relative error.
-        for &price in &[0.01, 0.1, 0.5, 1.0, 2.0, 10.0, 100.0, 500.0, 999.0] {
+        for &price in &[0.01, 0.1, 0.5, 1.0, 2.0, 10.0, 100.0, 500.0, 1e6] {
             let sqrt_px96 = price_to_sqrt_price_x96(price).unwrap();
             let recovered = sqrt_price_x96_to_price(sqrt_px96).unwrap();
             let rel_error = (recovered - price).abs() / price;
diff --git a/src/math/tick.rs b/src/math/tick.rs
index f257884..93ffbaf 100644
--- a/src/math/tick.rs
+++ b/src/math/tick.rs
@@ -504,14 +504,19 @@ mod tests {
 
     #[test]
     fn protocol_min_max_ticks_produce_valid_prices() {
-        // PerpCity uses ±69090 as its bounds.
+        // PerpCity uses ±138180 as its maker bounds, slightly wider than
+        // the factory's 1e-6..=1e6 starting-price range.
         let min_price = tick_to_price(constants::MIN_TICK).unwrap();
         let max_price = tick_to_price(constants::MAX_TICK).unwrap();
         assert!(min_price > 0.0);
         assert!(max_price > min_price);
-        // MIN_TICK ≈ -69090 → price ≈ 0.001
-        assert!((min_price - 0.001).abs() < 0.0005, "min_price={min_price}");
-        // MAX_TICK ≈ 69090 → price ≈ 1000
-        assert!((max_price - 1000.0).abs() < 1.0, "max_price={max_price}");
+        assert!(
+            (min_price - 1e-6).abs() / 1e-6 < 0.01,
+            "min_price={min_price}"
+        );
+        assert!(
+            (max_price - 1e6).abs() / 1e6 < 0.01,
+            "max_price={max_price}"
+        );
     }
 }