diff --git a/lib/db/models/Referral.ts b/lib/db/models/Referral.ts
index 1ff8ecbe..4594ac3b 100644
--- a/lib/db/models/Referral.ts
+++ b/lib/db/models/Referral.ts
@@ -1,13 +1,21 @@
 import { DataTypes, Model, Sequelize } from 'sequelize';
-import { SwapType } from '../../consts/Enums';
+import { OrderSide, SwapType } from '../../consts/Enums';
 
 type Limits = {
   minimal?: number;
   maximal?: number;
 };
 
-// TODO: direction of chain swaps
-type Premiums = Partial<Record<SwapType, number>>;
+type DirectionalPremium = Partial<{
+  [OrderSide.BUY]: number;
+  [OrderSide.SELL]: number;
+}>;
+
+type Premiums = Partial<{
+  [SwapType.Submarine]: number;
+  [SwapType.ReverseSubmarine]: number;
+  [SwapType.Chain]: DirectionalPremium;
+}>;
 
 type LimitsPerType = Partial<Record<SwapType, Limits>>;
 
@@ -131,27 +139,55 @@ class Referral extends Model implements ReferralType {
     return this.config?.limits?.[type];
   };
 
-  public premium = (pair: string, type: SwapType): number | undefined => {
-    return (
+  public premium = (
+    pair: string,
+    type: SwapType,
+    orderSide: OrderSide,
+  ): number | undefined => {
+    const premium =
       this.config?.pairs?.[pair]?.premiums?.[type] ||
-      this.config?.premiums?.[type]
-    );
+      this.config?.premiums?.[type];
+
+    if (type === SwapType.Chain) {
+      return premium !== undefined ? premium[orderSide] : undefined;
+    }
+
+    return premium as number | undefined;
   };
 
   public premiumForPairs = (
     pairs: string[],
     type: SwapType,
+    orderSide?: OrderSide,
   ): number | undefined => {
+    if (type === SwapType.Chain && orderSide === undefined) {
+      throw new Error('chain swap premiums require an order side');
+    }
+
     for (const pair of pairs) {
       const premium = this.config?.pairs?.[pair]?.premiums?.[type];
       if (premium !== undefined) {
-        return premium;
+        if (type === SwapType.Chain) {
+          return premium[orderSide!];
+        }
+        return premium as number | undefined;
       }
     }
 
-    return this.config?.premiums?.[type];
+    const premium = this.config?.premiums?.[type];
+    if (type === SwapType.Chain && premium !== undefined) {
+      return premium[orderSide!];
+    }
+
+    return premium as number | undefined;
   };
 }
 
 export default Referral;
-export { ReferralType, ReferralConfig, ReferralPairConfig };
+export {
+  ReferralType,
+  ReferralConfig,
+  ReferralPairConfig,
+  DirectionalPremium,
+  Premiums,
+};
diff --git a/lib/db/repositories/ReferralRepository.ts b/lib/db/repositories/ReferralRepository.ts
index 9c7f1dd4..3355bbd1 100644
--- a/lib/db/repositories/ReferralRepository.ts
+++ b/lib/db/repositories/ReferralRepository.ts
@@ -1,7 +1,12 @@
 import { QueryTypes } from 'sequelize';
-import { SuccessSwapUpdateEvents } from '../../consts/Enums';
+import {
+  OrderSide,
+  SuccessSwapUpdateEvents,
+  SwapType,
+} from '../../consts/Enums';
 import Database from '../Database';
 import Referral, {
+  DirectionalPremium,
   ReferralConfig,
   ReferralPairConfig,
   ReferralType,
@@ -38,6 +43,13 @@ class ReferralRepository {
         ORDER BY year, month;
     `;
 
+  private static readonly maxPremiumPercentage = 100;
+  private static readonly minPremiumPercentage = -100;
+  private static readonly minExpiration = 120;
+  private static readonly maxExpiration = 60 * 60 * 24;
+  private static readonly minRoutingFee = 0;
+  private static readonly maxRoutingFee = 0.005;
+
   public static addReferral = async (
     referral: ReferralType,
   ): Promise<Referral> => {
@@ -112,23 +124,67 @@ class ReferralRepository {
   private static sanityCheckConfig = (
     config: ReferralConfig | null | undefined,
   ) => {
-    const sanityCheckPairConfig = (cfg: ReferralPairConfig) => {
-      if (cfg.maxRoutingFee) {
-        if (cfg.maxRoutingFee < 0 || cfg.maxRoutingFee > 0.005) {
-          throw 'maxRoutingFee out of range';
+    const validateDirectionalPremium = (
+      premium: unknown,
+    ): DirectionalPremium => {
+      if (typeof premium === 'object') {
+        const premiumObj = premium as Record<string, unknown>;
+        if (
+          (OrderSide.BUY in premiumObj &&
+            typeof premiumObj[OrderSide.BUY] !== 'number') ||
+          (OrderSide.SELL in premiumObj &&
+            typeof premiumObj[OrderSide.SELL] !== 'number')
+        ) {
+          throw 'premium values must be numbers';
         }
       }
 
+      return premium as DirectionalPremium;
+    };
+
+    const sanityCheckPairConfig = (cfg: ReferralPairConfig) => {
+      if (
+        cfg.maxRoutingFee !== undefined &&
+        (cfg.maxRoutingFee < ReferralRepository.minRoutingFee ||
+          cfg.maxRoutingFee > ReferralRepository.maxRoutingFee)
+      ) {
+        throw 'maxRoutingFee out of range';
+      }
+
       if (cfg.premiums) {
-        if (Object.values(cfg.premiums).some((p) => p < -100 || p > 100)) {
-          throw 'premium out of range';
+        for (const [typeStr, premium] of Object.entries(cfg.premiums)) {
+          const type = Number(typeStr) as SwapType;
+
+          if (type === SwapType.Chain) {
+            const directionalPremium = validateDirectionalPremium(premium);
+            Object.values(directionalPremium).forEach((p) => {
+              if (
+                p < ReferralRepository.minPremiumPercentage ||
+                p > ReferralRepository.maxPremiumPercentage
+              ) {
+                throw 'premium out of range';
+              }
+            });
+          } else {
+            if (typeof premium !== 'number') {
+              throw 'premium must be a number';
+            }
+            if (
+              premium < ReferralRepository.minPremiumPercentage ||
+              premium > ReferralRepository.maxPremiumPercentage
+            ) {
+              throw 'premium out of range';
+            }
+          }
         }
       }
 
       if (cfg.expirations) {
         if (
           Object.values(cfg.expirations).some(
-            (e) => e < 120 || e > 60 * 60 * 24,
+            (e) =>
+              e < ReferralRepository.minExpiration ||
+              e > ReferralRepository.maxExpiration,
           )
         ) {
           throw 'expiration out of range';
@@ -140,9 +196,7 @@ class ReferralRepository {
       sanityCheckPairConfig(config);
 
       if (config.pairs) {
-        for (const pair of Object.values(config.pairs)) {
-          sanityCheckPairConfig(pair);
-        }
+        Object.values(config.pairs).forEach(sanityCheckPairConfig);
       }
     }
   };
diff --git a/lib/rates/FeeProvider.ts b/lib/rates/FeeProvider.ts
index 5a5c67be..e27af1e7 100644
--- a/lib/rates/FeeProvider.ts
+++ b/lib/rates/FeeProvider.ts
@@ -228,7 +228,7 @@ class FeeProvider {
       typeof percentageType === 'number'
         ? percentageType
         : percentageType[orderSide],
-      referral?.premium(pair, type),
+      referral?.premium(pair, type, orderSide),
     );
 
     return feeType === PercentageFeeType.Calculation
diff --git a/lib/rates/providers/RateProviderTaproot.ts b/lib/rates/providers/RateProviderTaproot.ts
index 05554240..fe56213e 100644
--- a/lib/rates/providers/RateProviderTaproot.ts
+++ b/lib/rates/providers/RateProviderTaproot.ts
@@ -511,7 +511,22 @@ class RateProviderTaproot extends RateProviderBase<SwapTypes> {
               [to, from],
             ].map(([base, quote]) => getPairId({ base, quote }));
 
-            const premium = referral?.premiumForPairs(pairIds, type);
+            const getConfigPairId = (pairIds: string[]) => {
+              for (const pairId of pairIds) {
+                if (this.pairConfigs.has(pairId)) {
+                  return pairId;
+                }
+              }
+              throw new Error('could not find pair id');
+            };
+
+            const { quote } = splitPairId(getConfigPairId(pairIds));
+
+            const premium = referral?.premiumForPairs(
+              pairIds,
+              type,
+              to === quote ? OrderSide.SELL : OrderSide.BUY,
+            );
             const limits = referral?.limitsForPairs(pairIds, type);
 
             const result = {
diff --git a/test/integration/db/models/Referral.spec.ts b/test/integration/db/models/Referral.spec.ts
index d9ce0a96..007c710a 100644
--- a/test/integration/db/models/Referral.spec.ts
+++ b/test/integration/db/models/Referral.spec.ts
@@ -1,6 +1,6 @@
 import Logger from '../../../../lib/Logger';
 import { createApiCredential } from '../../../../lib/Utils';
-import { SwapType } from '../../../../lib/consts/Enums';
+import { OrderSide, SwapType } from '../../../../lib/consts/Enums';
 import Database from '../../../../lib/db/Database';
 import ReferralRepository, {
   ReferralType,
@@ -19,6 +19,7 @@ describe('Referral', () => {
       premiums: {
         [SwapType.Submarine]: -15,
         [SwapType.ReverseSubmarine]: 21,
+        [SwapType.Chain]: { [OrderSide.BUY]: -15, [OrderSide.SELL]: -10 },
       },
       limits: {
         [SwapType.ReverseSubmarine]: {
@@ -30,7 +31,7 @@ describe('Referral', () => {
         'RBTC/BTC': {
           maxRoutingFee: 0.0025,
           premiums: {
-            [SwapType.Chain]: -25,
+            [SwapType.Chain]: { [OrderSide.BUY]: -25, [OrderSide.SELL]: -20 },
           },
           limits: {
             [SwapType.Submarine]: {
@@ -108,29 +109,36 @@ describe('Referral', () => {
   });
 
   test.each`
-    pair          | type                         | expected
-    ${'BTC/BTC'}  | ${SwapType.Submarine}        | ${referralValues.config!.premiums![SwapType.Submarine]}
-    ${'BTC/BTC'}  | ${SwapType.ReverseSubmarine} | ${referralValues.config!.premiums![SwapType.ReverseSubmarine]}
-    ${'BTC/BTC'}  | ${SwapType.Chain}            | ${referralValues.config!.premiums![SwapType.Chain]}
-    ${'RBTC/BTC'} | ${SwapType.Chain}            | ${referralValues.config!.pairs!['RBTC/BTC']!.premiums![SwapType.Chain]}
+    pair          | type                         | orderSide         | expected
+    ${'BTC/BTC'}  | ${SwapType.Submarine}        | ${undefined}      | ${referralValues.config!.premiums![SwapType.Submarine]}
+    ${'BTC/BTC'}  | ${SwapType.ReverseSubmarine} | ${undefined}      | ${referralValues.config!.premiums![SwapType.ReverseSubmarine]}
+    ${'BTC/BTC'}  | ${SwapType.Chain}            | ${OrderSide.BUY}  | ${referralValues.config!.premiums![SwapType.Chain]![OrderSide.BUY]}
+    ${'BTC/BTC'}  | ${SwapType.Chain}            | ${OrderSide.SELL} | ${referralValues.config!.premiums![SwapType.Chain]![OrderSide.SELL]}
+    ${'RBTC/BTC'} | ${SwapType.Chain}            | ${OrderSide.BUY}  | ${referralValues.config!.pairs!['RBTC/BTC']!.premiums![SwapType.Chain]![OrderSide.BUY]}
+    ${'RBTC/BTC'} | ${SwapType.Chain}            | ${OrderSide.SELL} | ${referralValues.config!.pairs!['RBTC/BTC']!.premiums![SwapType.Chain]![OrderSide.SELL]}
   `(
     'should get premium for pair $pair and type $type',
-    async ({ pair, type, expected }) => {
+    async ({ pair, type, orderSide, expected }) => {
       const ref = await ReferralRepository.getReferralById(referralValues.id);
 
       expect(ref).not.toBeNull();
-      expect(ref!.premium(pair, type)).toEqual(expected);
+      expect(ref!.premium(pair, type, orderSide)).toEqual(expected);
     },
   );
 
   test.each`
-    pairs                      | type              | expected
-    ${['BTC/BTC']}             | ${SwapType.Chain} | ${referralValues.config!.premiums![SwapType.Chain]}
-    ${['BTC/BTC', 'RBTC/BTC']} | ${SwapType.Chain} | ${referralValues.config!.pairs!['RBTC/BTC']!.premiums![SwapType.Chain]}
-  `('should get premium for pairs', async ({ pairs, type, expected }) => {
-    const ref = await ReferralRepository.getReferralById(referralValues.id);
+    pairs                      | type              | orderSide         | expected
+    ${['BTC/BTC']}             | ${SwapType.Chain} | ${OrderSide.BUY}  | ${referralValues.config!.premiums![SwapType.Chain]![OrderSide.BUY]}
+    ${['BTC/BTC']}             | ${SwapType.Chain} | ${OrderSide.SELL} | ${referralValues.config!.premiums![SwapType.Chain]![OrderSide.SELL]}
+    ${['BTC/BTC', 'RBTC/BTC']} | ${SwapType.Chain} | ${OrderSide.BUY}  | ${referralValues.config!.pairs!['RBTC/BTC']!.premiums![SwapType.Chain]![OrderSide.BUY]}
+    ${['BTC/BTC', 'RBTC/BTC']} | ${SwapType.Chain} | ${OrderSide.SELL} | ${referralValues.config!.pairs!['RBTC/BTC']!.premiums![SwapType.Chain]![OrderSide.SELL]}
+  `(
+    'should get premium for pairs',
+    async ({ pairs, type, orderSide, expected }) => {
+      const ref = await ReferralRepository.getReferralById(referralValues.id);
 
-    expect(ref).not.toBeNull();
-    expect(ref!.premiumForPairs(pairs, type)).toEqual(expected);
-  });
+      expect(ref).not.toBeNull();
+      expect(ref!.premiumForPairs(pairs, type, orderSide)).toEqual(expected);
+    },
+  );
 });
diff --git a/test/integration/db/repositories/ReferralRepository.spec.ts b/test/integration/db/repositories/ReferralRepository.spec.ts
index 73f86d4a..91c6aa7f 100644
--- a/test/integration/db/repositories/ReferralRepository.spec.ts
+++ b/test/integration/db/repositories/ReferralRepository.spec.ts
@@ -1,5 +1,5 @@
 import Logger from '../../../../lib/Logger';
-import { SwapType } from '../../../../lib/consts/Enums';
+import { OrderSide, SwapType } from '../../../../lib/consts/Enums';
 import Database from '../../../../lib/db/Database';
 import Referral from '../../../../lib/db/models/Referral';
 import ReferralRepository from '../../../../lib/db/repositories/ReferralRepository';
@@ -148,6 +148,80 @@ describe('ReferralRepository', () => {
           ).rejects.toEqual(`${field} out of range`);
         },
       );
+
+      test.each`
+        premium                                 | description
+        ${{ [OrderSide.BUY]: 'not-a-number' }}  | ${'invalid BUY value type'}
+        ${{ [OrderSide.SELL]: 'not-a-number' }} | ${'invalid SELL value type'}
+        ${{ [OrderSide.BUY]: true }}            | ${'invalid BUY value type'}
+        ${{ [OrderSide.SELL]: {} }}             | ${'invalid SELL value type'}
+        ${{ [OrderSide.BUY]: () => {} }}        | ${'invalid BUY value type'}
+        ${{ [OrderSide.SELL]: [1, 2] }}         | ${'invalid SELL value type'}
+      `(
+        'should throw if chain swap premium has $description',
+        async ({ premium }) => {
+          await expect(
+            ReferralRepository.addReferral({
+              ...fixture,
+              config: {
+                premiums: {
+                  [SwapType.Chain]: premium,
+                },
+              },
+            }),
+          ).rejects.toEqual('premium values must be numbers');
+        },
+      );
+
+      test.each`
+        premium                                          | description
+        ${{}}                                            | ${'empty object'}
+        ${{ [OrderSide.BUY]: 10 }}                       | ${'only BUY'}
+        ${{ [OrderSide.SELL]: 10 }}                      | ${'only SELL'}
+        ${{ [OrderSide.BUY]: 10, [OrderSide.SELL]: 10 }} | ${'both BUY and SELL'}
+      `(
+        'should accept valid chain swap premium ($description)',
+        async ({ premium }) => {
+          const ref = await ReferralRepository.addReferral({
+            ...fixture,
+            config: {
+              premiums: {
+                [SwapType.Chain]: premium,
+              },
+            },
+          });
+
+          expect(ref.config?.premiums?.[SwapType.Chain]).toEqual(premium);
+        },
+      );
+
+      test.each`
+        buy     | sell
+        ${10}   | ${20}
+        ${-100} | ${-100}
+        ${0}    | ${0}
+        ${100}  | ${100}
+      `(
+        'should accept valid chain swap premiums (buy: $buy, sell: $sell)',
+        async ({ buy, sell }) => {
+          const ref = await ReferralRepository.addReferral({
+            ...fixture,
+            config: {
+              premiums: {
+                [SwapType.Chain]: {
+                  [OrderSide.BUY]: buy,
+                  [OrderSide.SELL]: sell,
+                },
+              },
+            },
+          });
+
+          expect(ref.config?.premiums?.[SwapType.Chain]).toEqual({
+            [OrderSide.BUY]: buy,
+            [OrderSide.SELL]: sell,
+          });
+        },
+      );
     });
   });
 });
diff --git a/test/unit/rates/FeeProvider.spec.ts b/test/unit/rates/FeeProvider.spec.ts
index 13d8a34e..16c62ad2 100644
--- a/test/unit/rates/FeeProvider.spec.ts
+++ b/test/unit/rates/FeeProvider.spec.ts
@@ -322,6 +322,46 @@ describe('FeeProvider', () => {
         ),
       ).toEqual(1.2);
     });
+
+    test('should apply directional premiums for chain swaps', () => {
+      const referral = {
+        premium: jest.fn().mockImplementation((pair, type, orderSide) => {
+          if (orderSide === OrderSide.BUY) return -50;
+          return 50;
+        }),
+      } as unknown as Referral;
+
+      expect(
+        feeProvider.getPercentageFee(
+          'BTC/BTC',
+          OrderSide.BUY,
+          SwapType.Chain,
+          PercentageFeeType.Calculation,
+          referral,
+        ),
+      ).toEqual(0.005);
+
+      expect(
+        feeProvider.getPercentageFee(
+          'BTC/BTC',
+          OrderSide.SELL,
+          SwapType.Chain,
+          PercentageFeeType.Calculation,
+          referral,
+        ),
+      ).toEqual(0.025);
+
+      expect(referral.premium).toHaveBeenCalledWith(
+        'BTC/BTC',
+        SwapType.Chain,
+        OrderSide.BUY,
+      );
+      expect(referral.premium).toHaveBeenCalledWith(
+        'BTC/BTC',
+        SwapType.Chain,
+        OrderSide.SELL,
+      );
+    });
   });
 
   test('should update miner fees', async () => {
diff --git a/test/unit/rates/providers/RateProviderTaproot.spec.ts b/test/unit/rates/providers/RateProviderTaproot.spec.ts
index 2ce18b2d..756cfb19 100644
--- a/test/unit/rates/providers/RateProviderTaproot.spec.ts
+++ b/test/unit/rates/providers/RateProviderTaproot.spec.ts
@@ -143,6 +143,7 @@ describe('RateProviderTaproot', () => {
         expect(referral.premiumForPairs).toHaveBeenCalledWith(
           expect.arrayContaining(['L-BTC/BTC', 'BTC/L-BTC']),
           type,
+          expect.any(Number),
         );
 
         expect(