diff --git a/packages/launchpad/src/fee.spec.ts b/packages/launchpad/src/fee.spec.ts
index 7a94238a..4f5c0163 100644
--- a/packages/launchpad/src/fee.spec.ts
+++ b/packages/launchpad/src/fee.spec.ts
@@ -12,12 +12,38 @@ describe("GasPrice", () => {
     });
   });
 
-  it("can be constructed from a config string", () => {
-    const inputs = ["3.14", "3", "0.14"];
-    inputs.forEach((input) => {
-      const gasPrice = GasPrice.fromString(`${input}utest`);
-      expect(gasPrice.amount.toString()).toEqual(input);
-      expect(gasPrice.denom).toEqual("utest");
+  describe("fromString", () => {
+    it("works", () => {
+      const inputs = ["3.14", "3", "0.14"];
+      inputs.forEach((input) => {
+        const gasPrice = GasPrice.fromString(`${input}utest`);
+        expect(gasPrice.amount.toString()).toEqual(input);
+        expect(gasPrice.denom).toEqual("utest");
+      });
+    });
+
+    it("errors for invalid gas price", () => {
+      // Checks basic format <amount><denom>
+      expect(() => GasPrice.fromString("")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("utkn")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("@utkn")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("234")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("-234tkn")).toThrowError(/Invalid gas price string/i);
+      // Checks details of <denom>
+      expect(() => GasPrice.fromString("234t")).toThrowError(
+        /denomination must be between 3 and 127 characters/i,
+      );
+      expect(() => GasPrice.fromString("234tt")).toThrowError(
+        /denomination must be between 3 and 127 characters/i,
+      );
+      expect(() =>
+        GasPrice.fromString(
+          "234tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt",
+        ),
+      ).toThrowError(/denomination must be between 3 and 127 characters/i);
+      // Checks details of <amount>
+      expect(() => GasPrice.fromString("3.utkn")).toThrowError(/Fractional part missing/i);
+      expect(() => GasPrice.fromString("..utkn")).toThrowError(/More than one separator found/i);
     });
   });
 });
diff --git a/packages/launchpad/src/fee.ts b/packages/launchpad/src/fee.ts
index c76062cc..f1c4e8fc 100644
--- a/packages/launchpad/src/fee.ts
+++ b/packages/launchpad/src/fee.ts
@@ -13,7 +13,7 @@ export class GasPrice {
   }
 
   public static fromString(gasPrice: string): GasPrice {
-    const matchResult = gasPrice.match(/^(?<amount>.+?)(?<denom>[a-z]+)$/);
+    const matchResult = gasPrice.match(/^(?<amount>[0-9.]+?)(?<denom>[a-z]+)$/);
     if (!matchResult) {
       throw new Error("Invalid gas price string");
     }
diff --git a/packages/stargate/src/fee.spec.ts b/packages/stargate/src/fee.spec.ts
index 7a94238a..4f5c0163 100644
--- a/packages/stargate/src/fee.spec.ts
+++ b/packages/stargate/src/fee.spec.ts
@@ -12,12 +12,38 @@ describe("GasPrice", () => {
     });
   });
 
-  it("can be constructed from a config string", () => {
-    const inputs = ["3.14", "3", "0.14"];
-    inputs.forEach((input) => {
-      const gasPrice = GasPrice.fromString(`${input}utest`);
-      expect(gasPrice.amount.toString()).toEqual(input);
-      expect(gasPrice.denom).toEqual("utest");
+  describe("fromString", () => {
+    it("works", () => {
+      const inputs = ["3.14", "3", "0.14"];
+      inputs.forEach((input) => {
+        const gasPrice = GasPrice.fromString(`${input}utest`);
+        expect(gasPrice.amount.toString()).toEqual(input);
+        expect(gasPrice.denom).toEqual("utest");
+      });
+    });
+
+    it("errors for invalid gas price", () => {
+      // Checks basic format <amount><denom>
+      expect(() => GasPrice.fromString("")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("utkn")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("@utkn")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("234")).toThrowError(/Invalid gas price string/i);
+      expect(() => GasPrice.fromString("-234tkn")).toThrowError(/Invalid gas price string/i);
+      // Checks details of <denom>
+      expect(() => GasPrice.fromString("234t")).toThrowError(
+        /denomination must be between 3 and 127 characters/i,
+      );
+      expect(() => GasPrice.fromString("234tt")).toThrowError(
+        /denomination must be between 3 and 127 characters/i,
+      );
+      expect(() =>
+        GasPrice.fromString(
+          "234tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt",
+        ),
+      ).toThrowError(/denomination must be between 3 and 127 characters/i);
+      // Checks details of <amount>
+      expect(() => GasPrice.fromString("3.utkn")).toThrowError(/Fractional part missing/i);
+      expect(() => GasPrice.fromString("..utkn")).toThrowError(/More than one separator found/i);
     });
   });
 });
diff --git a/packages/stargate/src/fee.ts b/packages/stargate/src/fee.ts
index 628c0350..a41c7ce2 100644
--- a/packages/stargate/src/fee.ts
+++ b/packages/stargate/src/fee.ts
@@ -20,7 +20,7 @@ export class GasPrice {
   }
 
   public static fromString(gasPrice: string): GasPrice {
-    const matchResult = gasPrice.match(/^(?<amount>.+?)(?<denom>[a-z]+)$/);
+    const matchResult = gasPrice.match(/^(?<amount>[0-9.]+?)(?<denom>[a-z]+)$/);
     if (!matchResult) {
       throw new Error("Invalid gas price string");
     }