diff --git a/api/src/modules/calculations/data.repository.ts b/api/src/modules/calculations/data.repository.ts
index f217ba91..90a862c8 100644
--- a/api/src/modules/calculations/data.repository.ts
+++ b/api/src/modules/calculations/data.repository.ts
@@ -12,6 +12,7 @@ import { OverridableCostInputs } from '@api/modules/custom-projects/dto/project-
 import { BaseSize } from '@shared/entities/base-size.entity';
 import { BaseIncrease } from '@shared/entities/base-increase.entity';
 import { AssumptionsRepository } from '@api/modules/calculations/assumptions.repository';
+import { GetActivityTypesDefaults } from '@shared/dtos/custom-projects/get-activity-types-defaults.dto';
 
 /**
  * Additional data that is required to perform calculations, which is not overridable by the user. Better naming and clustering of concepts would be great
@@ -110,6 +111,62 @@ export class DataRepository extends Repository<BaseDataView> {
     return additionalBaseData;
   }
 
+  async getActivityTypesDefaults(dto: GetActivityTypesDefaults) {
+    const defaults = {};
+
+    [defaults[ACTIVITY.CONSERVATION], defaults[ACTIVITY.RESTORATION]] =
+      await Promise.all([
+        this.getConservationActivityDefaults(dto),
+        this.getRestorationActivityDefaults(dto),
+      ]);
+
+    return defaults;
+  }
+
+  private async getConservationActivityDefaults(dto: GetActivityTypesDefaults) {
+    const { countryCode, ecosystem } = dto;
+
+    const result = await this.findOne({
+      where: { countryCode, ecosystem, activity: ACTIVITY.CONSERVATION },
+      select: [
+        'ecosystemLossRate',
+        'tier1EmissionFactor',
+        'emissionFactorAgb',
+        'emissionFactorSoc',
+      ],
+    });
+    if (result === null) return null;
+
+    return {
+      ecosystemLossRate: result.ecosystemLossRate,
+      emissionFactor: {
+        tier1: result.tier1EmissionFactor,
+        tier2: {
+          emissionFactorAgb: result.emissionFactorAgb,
+          emissionFactorSoc: result.emissionFactorSoc,
+        },
+      },
+    };
+  }
+
+  private async getRestorationActivityDefaults(dto: GetActivityTypesDefaults) {
+    const { countryCode, ecosystem } = dto;
+
+    const result = await this.findOne({
+      where: { countryCode, ecosystem, activity: ACTIVITY.RESTORATION },
+      select: ['activity', 'tier1SequestrationRate', 'tier2SequestrationRate'],
+    });
+    if (result === null) return null;
+
+    return {
+      activity: result.activity,
+      sequestrationRate: {
+        tier1: result.tier1SequestrationRate,
+        tier2: result.tier2SequestrationRate,
+      },
+    };
+  }
+
   async getOverridableCostInputs(
     dto: GetOverridableCostInputs,
   ): Promise<OverridableCostInputs> {
diff --git a/api/src/modules/custom-projects/custom-projects.controller.ts b/api/src/modules/custom-projects/custom-projects.controller.ts
index 85a75d2a..f2be8736 100644
--- a/api/src/modules/custom-projects/custom-projects.controller.ts
+++ b/api/src/modules/custom-projects/custom-projects.controller.ts
@@ -25,6 +25,17 @@ export class CustomProjectsController {
     private readonly customProjects: CustomProjectsService,
   ) {}
 
+  @TsRestHandler(customProjectContract.getActivityTypesDefaults)
+  async getActivityTypeDefaults(): Promise<ControllerResponse> {
+    return tsRestHandler(
+      customProjectContract.getActivityTypesDefaults,
+      async ({ query }) => {
+        const data = await this.customProjects.getActivityTypeDefaults(query);
+        return { body: { data }, status: HttpStatus.OK };
+      },
+    );
+  }
+
   @TsRestHandler(customProjectContract.getAvailableCountries)
   async getAvailableCountriesToCreateACustomProject(): Promise<ControllerResponse> {
     return tsRestHandler(
diff --git a/api/src/modules/custom-projects/custom-projects.service.ts b/api/src/modules/custom-projects/custom-projects.service.ts
index 11c8cd31..fad558f1 100644
--- a/api/src/modules/custom-projects/custom-projects.service.ts
+++ b/api/src/modules/custom-projects/custom-projects.service.ts
@@ -19,6 +19,7 @@ import { User } from '@shared/entities/users/user.entity';
 import { EventBus } from '@nestjs/cqrs';
 import { SaveCustomProjectEvent } from '@api/modules/custom-projects/events/save-custom-project.event';
 import { FetchSpecification } from 'nestjs-base-service';
+import { GetActivityTypesDefaults } from '@shared/dtos/custom-projects/get-activity-types-defaults.dto';
 
 @Injectable()
 export class CustomProjectsService extends AppBaseService<
@@ -87,6 +88,10 @@ export class CustomProjectsService extends AppBaseService<
     }
   }
 
+  async getActivityTypeDefaults(dto: GetActivityTypesDefaults) {
+    return this.dataRepository.getActivityTypesDefaults(dto);
+  }
+
   async getDefaultCostInputs(
     dto: GetOverridableCostInputs,
   ): Promise<OverridableCostInputs> {
diff --git a/api/test/integration/custom-projects/custom-projects-setup.spec.ts b/api/test/integration/custom-projects/custom-projects-setup.spec.ts
index 9feb9b9b..b301d4ca 100644
--- a/api/test/integration/custom-projects/custom-projects-setup.spec.ts
+++ b/api/test/integration/custom-projects/custom-projects-setup.spec.ts
@@ -20,7 +20,21 @@ describe('Create Custom Projects - Setup', () => {
     await testManager.close();
   });
 
-  describe('Get Overridable Model Assumptions', () => {
+  describe('Get Activity type defaults', () => {
+    test('Should return activity type defaults based on country and ecosystem', async () => {
+      const response = await testManager
+        .request()
+        .get(customProjectContract.getActivityTypesDefaults.path)
+        .query({
+          countryCode: 'IND',
+          ecosystem: ECOSYSTEM.MANGROVE,
+        });
+
+      expect(response.status).toBe(200);
+    });
+  });
+
+  describe.skip('Get Overridable Model Assumptions', () => {
     test('Should return overridable model assumptions based on ecosystem and activity', async () => {
       const response = await testManager
         .request()
diff --git a/shared/contracts/custom-projects.contract.ts b/shared/contracts/custom-projects.contract.ts
index 7f8aeb9f..7b1c5aaa 100644
--- a/shared/contracts/custom-projects.contract.ts
+++ b/shared/contracts/custom-projects.contract.ts
@@ -12,12 +12,23 @@ import { OverridableCostInputs } from "@api/modules/custom-projects/dto/project-
 import { GetAssumptionsSchema } from "@shared/schemas/assumptions/get-assumptions.schema";
 import { ModelAssumptions } from "@shared/entities/model-assumptions.entity";
 import { generateEntityQuerySchema } from "@shared/schemas/query-param.schema";
+import { GetActivityTypesDefaultsSchema } from "@shared/schemas/custom-projects/activity-types-defaults.schema";
 
 export const customProjecsQuerySchema =
   generateEntityQuerySchema(CustomProject);
 
 const contract = initContract();
 export const customProjectContract = contract.router({
+  getActivityTypesDefaults: {
+    method: "GET",
+    path: "/custom-projects/activity-types-defaults",
+    query: GetActivityTypesDefaultsSchema,
+    responses: {
+      200: contract.type<ApiResponse<any>>(),
+    },
+    summary:
+      "Get default values for fields based on the selected activity type and country",
+  },
   getAvailableCountries: {
     method: "GET",
     path: "/custom-projects/available-countries",
diff --git a/shared/dtos/custom-projects/get-activity-types-defaults.dto.ts b/shared/dtos/custom-projects/get-activity-types-defaults.dto.ts
new file mode 100644
index 00000000..81f6e1a2
--- /dev/null
+++ b/shared/dtos/custom-projects/get-activity-types-defaults.dto.ts
@@ -0,0 +1,6 @@
+import { GetActivityTypesDefaultsSchema } from "@shared/schemas/custom-projects/activity-types-defaults.schema";
+import { z } from "zod";
+
+export type GetActivityTypesDefaults = z.infer<
+  typeof GetActivityTypesDefaultsSchema
+>;
diff --git a/shared/schemas/custom-projects/activity-types-defaults.schema.ts b/shared/schemas/custom-projects/activity-types-defaults.schema.ts
new file mode 100644
index 00000000..6b817ae7
--- /dev/null
+++ b/shared/schemas/custom-projects/activity-types-defaults.schema.ts
@@ -0,0 +1,7 @@
+import { z } from "zod";
+import { ECOSYSTEM } from "@shared/entities/ecosystem.enum";
+
+export const GetActivityTypesDefaultsSchema = z.object({
+  countryCode: z.string().min(3).max(3),
+  ecosystem: z.nativeEnum(ECOSYSTEM),
+});