diff --git a/src/relayer-provider/v1/networkV1.ts b/src/relayer-provider/v1/networkV1.ts
index 1904db1b..ca47536d 100644
--- a/src/relayer-provider/v1/networkV1.ts
+++ b/src/relayer-provider/v1/networkV1.ts
@@ -11,6 +11,7 @@ import {
 } from '@sdk/lowlevel/constants';
 import { fetchRelayerV1Get } from './fetchRelayerV1';
 import { isNonEmptyString, removeSuffix } from '@base/string';
+import { TFHEError } from '../../errors/TFHEError';
 
 // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
 type CachedKey = {
@@ -142,7 +143,8 @@ export async function getKeysFromRelayer(
     keyurlCache[versionUrl] = result;
     return result;
   } catch (e) {
-    throw new Error('Impossible to fetch public key: wrong relayer url.', {
+    throw new TFHEError({
+      message: 'Failed to fetch keys from relayer',
       cause: e,
     });
   }
diff --git a/src/sdk/lowlevel/TFHEPkeCrs.test.ts b/src/sdk/lowlevel/TFHEPkeCrs.test.ts
index e4c2bd14..4e9ba8a6 100644
--- a/src/sdk/lowlevel/TFHEPkeCrs.test.ts
+++ b/src/sdk/lowlevel/TFHEPkeCrs.test.ts
@@ -270,19 +270,19 @@ describeIfFetchMock('TFHEPkeCrs', () => {
     it('throws on invalid params (missing id)', async () => {
       await expect(
         TFHEPkeCrs.fetch({ srcUrl: testUrl, capacity: 2048 } as any),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch CRS');
     });
 
     it('throws on invalid params (missing srcUrl)', async () => {
       await expect(
         TFHEPkeCrs.fetch({ id: assetPublicParamsId, capacity: 2048 } as any),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch CRS');
     });
 
     it('throws on invalid params (missing capacity)', async () => {
       await expect(
         TFHEPkeCrs.fetch({ id: assetPublicParamsId, srcUrl: testUrl } as any),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch CRS');
     });
 
     it('throws on fetch error', async () => {
diff --git a/src/sdk/lowlevel/TFHEPkeCrs.ts b/src/sdk/lowlevel/TFHEPkeCrs.ts
index 0fd0cb95..d2fd8b5b 100644
--- a/src/sdk/lowlevel/TFHEPkeCrs.ts
+++ b/src/sdk/lowlevel/TFHEPkeCrs.ts
@@ -172,7 +172,7 @@ export class TFHEPkeCrs {
       return await TFHEPkeCrs.#fetch(params);
     } catch (e) {
       throw new TFHEError({
-        message: 'Impossible to fetch public key: wrong relayer url.',
+        message: 'Failed to fetch CRS',
         cause: e,
       });
     }
diff --git a/src/sdk/lowlevel/TFHEPkeParams.test.ts b/src/sdk/lowlevel/TFHEPkeParams.test.ts
index 1ea83916..e29c978d 100644
--- a/src/sdk/lowlevel/TFHEPkeParams.test.ts
+++ b/src/sdk/lowlevel/TFHEPkeParams.test.ts
@@ -309,7 +309,7 @@ describe('TFHEPkeParams', () => {
             capacity: 2048,
           },
         }),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch PKE params');
     });
 
     it('throws on invalid pkeCrs bytes', async () => {
@@ -334,7 +334,7 @@ describe('TFHEPkeParams', () => {
             capacity: 2048,
           },
         }),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch PKE params');
     });
   });
 });
diff --git a/src/sdk/lowlevel/TFHEPkeParams.ts b/src/sdk/lowlevel/TFHEPkeParams.ts
index 101d730e..c1e7e876 100644
--- a/src/sdk/lowlevel/TFHEPkeParams.ts
+++ b/src/sdk/lowlevel/TFHEPkeParams.ts
@@ -166,7 +166,7 @@ export class TFHEPkeParams {
       });
     } catch (e) {
       throw new TFHEError({
-        message: 'Impossible to fetch public key: wrong relayer url.',
+        message: 'Failed to fetch PKE params',
         cause: e,
       });
     }
diff --git a/src/sdk/lowlevel/TFHEPublicKey.test.ts b/src/sdk/lowlevel/TFHEPublicKey.test.ts
index 3c0b44d6..8e934bf8 100644
--- a/src/sdk/lowlevel/TFHEPublicKey.test.ts
+++ b/src/sdk/lowlevel/TFHEPublicKey.test.ts
@@ -285,13 +285,13 @@ describe('TFHEPublicKey', () => {
     it('throws on invalid params (missing id)', async () => {
       await expect(
         TFHEPublicKey.fetch({ srcUrl: testUrl } as any),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch public key');
     });
 
     it('throws on invalid params (missing srcUrl)', async () => {
       await expect(
         TFHEPublicKey.fetch({ id: tfhePublicKeyBytes.id } as any),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch public key');
     });
 
     it('throws on fetch error', async () => {
@@ -318,7 +318,7 @@ describe('TFHEPublicKey', () => {
           id: tfhePublicKeyBytes.id,
           srcUrl: testUrl,
         }),
-      ).rejects.toThrow('Impossible to fetch public key: wrong relayer url.');
+      ).rejects.toThrow('Failed to fetch public key');
     });
   });
 
diff --git a/src/sdk/lowlevel/TFHEPublicKey.ts b/src/sdk/lowlevel/TFHEPublicKey.ts
index e60ef1a6..e1c5a6dc 100644
--- a/src/sdk/lowlevel/TFHEPublicKey.ts
+++ b/src/sdk/lowlevel/TFHEPublicKey.ts
@@ -129,7 +129,7 @@ export class TFHEPublicKey {
       return await TFHEPublicKey.#fetch(params);
     } catch (e) {
       throw new TFHEError({
-        message: 'Impossible to fetch public key: wrong relayer url.',
+        message: 'Failed to fetch public key',
         cause: e,
       });
     }