diff --git a/src/shared/rpc/methods/send-transfer.spec.ts b/src/shared/rpc/methods/send-transfer.spec.ts
index 0104b3e53b..a0fc02e826 100644
--- a/src/shared/rpc/methods/send-transfer.spec.ts
+++ b/src/shared/rpc/methods/send-transfer.spec.ts
@@ -103,4 +103,18 @@ describe('`sendTransfer` method', () => {
     );
     expect(result.success).toEqual(false);
   });
+
+  test('that it supports regtest addresses', () => {
+    const result = rpcSendTransferParamsSchema.safeParse({
+      network: 'sbtcTestnet',
+      account: 0,
+      recipients: [
+        {
+          address: 'bcrt1pzxz00vdnc8j4rz6u9axp6jmh60f8v7t8zkmwzm4x3899fvvl78nseyz7r2',
+          amount: '100',
+        },
+      ],
+    });
+    expect(result.success).toEqual(true);
+  });
 });
diff --git a/src/shared/rpc/methods/send-transfer.ts b/src/shared/rpc/methods/send-transfer.ts
index 04cf9237db..d2c94ae429 100644
--- a/src/shared/rpc/methods/send-transfer.ts
+++ b/src/shared/rpc/methods/send-transfer.ts
@@ -1,7 +1,7 @@
 import type { SendTransferRequestParams } from '@btckit/types';
 import { z } from 'zod';
 
-import { type BitcoinNetworkModes } from '@leather.io/models';
+import { type BitcoinNetworkModes, type DefaultNetworkConfigurations } from '@leather.io/models';
 import { uniqueArray } from '@leather.io/utils';
 
 import { FormErrorMessages } from '@shared/error-messages';
@@ -11,7 +11,7 @@ import {
 } from '@shared/forms/address-validators';
 import { checkIfDigitsOnly } from '@shared/forms/amount-validators';
 
-import { defaultNetworksSchema } from '../rpc-schemas';
+import { defaultNetworkIdSchema } from '../rpc-schemas';
 import {
   accountSchema,
   formatValidationErrors,
@@ -21,17 +21,35 @@ import {
 
 export const defaultRpcSendTransferNetwork = 'mainnet';
 
+function defaultNetworkIdToBitcoinNetworkMode(
+  networkId: DefaultNetworkConfigurations
+): BitcoinNetworkModes {
+  switch (networkId) {
+    case 'mainnet':
+      return 'mainnet';
+    case 'testnet':
+    case 'testnet4':
+      return 'testnet';
+    case 'sbtcTestnet':
+    case 'sbtcDevenv':
+    case 'devnet':
+      return 'regtest';
+    case 'signet':
+      return 'signet';
+  }
+}
+
 export const rpcSendTransferParamsSchemaLegacy = z.object({
   account: accountSchema.optional(),
   address: z.string(),
   amount: z.string(),
-  network: defaultNetworksSchema.optional(),
+  network: defaultNetworkIdSchema.optional(),
 });
 
 export const rpcSendTransferParamsSchema = z
   .object({
     account: accountSchema.optional(),
-    network: defaultNetworksSchema.optional(),
+    network: defaultNetworkIdSchema.optional(),
     recipients: z
       .array(
         z.object({
@@ -54,8 +72,12 @@ export const rpcSendTransferParamsSchema = z
   })
   .refine(
     ({ network, recipients }) => {
+      if (!network) return true;
+
       const addressNetworks = recipients.map(recipient =>
-        btcAddressNetworkValidator(network as BitcoinNetworkModes).isValidSync(recipient.address)
+        btcAddressNetworkValidator(defaultNetworkIdToBitcoinNetworkMode(network)).isValidSync(
+          recipient.address
+        )
       );
 
       return !addressNetworks.some(val => val === false);
diff --git a/src/shared/rpc/methods/sign-message.ts b/src/shared/rpc/methods/sign-message.ts
index 1c23a6094a..22d83a90f8 100644
--- a/src/shared/rpc/methods/sign-message.ts
+++ b/src/shared/rpc/methods/sign-message.ts
@@ -2,7 +2,7 @@ import { z } from 'zod';
 
 import type { PaymentTypes } from '@leather.io/rpc';
 
-import { defaultNetworksSchema } from '../rpc-schemas';
+import { defaultNetworkIdSchema } from '../rpc-schemas';
 import {
   accountSchema,
   formatValidationErrors,
@@ -14,7 +14,7 @@ const rpcSignMessageParamsSchema = z.object({
   type: z.enum(['bip322']).optional(),
   account: accountSchema.optional(),
   message: z.string(),
-  network: defaultNetworksSchema.optional(),
+  network: defaultNetworkIdSchema.optional(),
   paymentType: z.enum(['p2tr', 'p2wpkh'] as [PaymentTypes, PaymentTypes]).optional(),
 });
 
diff --git a/src/shared/rpc/methods/sign-psbt.ts b/src/shared/rpc/methods/sign-psbt.ts
index d19dbe822f..54f4db6ba7 100644
--- a/src/shared/rpc/methods/sign-psbt.ts
+++ b/src/shared/rpc/methods/sign-psbt.ts
@@ -8,7 +8,7 @@ import {
   RpcResponse,
 } from '@leather.io/rpc';
 
-import { defaultNetworksSchema } from '../rpc-schemas';
+import { defaultNetworkIdSchema } from '../rpc-schemas';
 import {
   accountSchema,
   formatValidationErrors,
@@ -36,7 +36,7 @@ const rpcSignPsbtParamsSchema = z.object({
   allowedSighash: z.array(z.any()).optional(),
   broadcast: z.boolean().optional(),
   hex: z.string(),
-  network: defaultNetworksSchema.optional(),
+  network: defaultNetworkIdSchema.optional(),
   signAtIndex: z
     .union([z.number(), z.array(z.number())])
     .optional()
diff --git a/src/shared/rpc/rpc-schemas.ts b/src/shared/rpc/rpc-schemas.ts
index 29554a9e3b..5f5b887237 100644
--- a/src/shared/rpc/rpc-schemas.ts
+++ b/src/shared/rpc/rpc-schemas.ts
@@ -5,8 +5,11 @@ import {
   WalletDefaultNetworkConfigurationIds,
 } from '@leather.io/models';
 
-type NonEmptyNetworkList = [DefaultNetworkConfigurations, ...DefaultNetworkConfigurations[]];
+type NonEmptyDefaultNetworkIdList = [
+  DefaultNetworkConfigurations,
+  ...DefaultNetworkConfigurations[],
+];
 
-export const defaultNetworksSchema = z.enum(
-  Object.values(WalletDefaultNetworkConfigurationIds) as NonEmptyNetworkList
+export const defaultNetworkIdSchema = z.enum(
+  Object.values(WalletDefaultNetworkConfigurationIds) as NonEmptyDefaultNetworkIdList
 );