diff --git a/packages/api-common/source/rcp/processor.ts b/packages/api-common/source/rcp/processor.ts
index bcabb4371..652efd8b5 100644
--- a/packages/api-common/source/rcp/processor.ts
+++ b/packages/api-common/source/rcp/processor.ts
@@ -1,6 +1,6 @@
 import Hapi from "@hapi/hapi";
 import { inject, injectable } from "@mainsail/container";
-import { Contracts, Identifiers } from "@mainsail/contracts";
+import { Contracts, Exceptions, Identifiers } from "@mainsail/contracts";
 
 import { getRcpId, prepareRcpError } from "./utils.js";
 
@@ -37,7 +37,11 @@ export class Processor implements Contracts.Api.RPC.Processor {
 				jsonrpc: "2.0",
 				result: await action.handle(payload.params),
 			};
-		} catch {
+		} catch (error) {
+			if (error instanceof Exceptions.RpcError) {
+				return prepareRcpError(getRcpId(request), error.code, error.message);
+			}
+
 			return prepareRcpError(getRcpId(request), Contracts.Api.RPC.ErrorCode.InternalError);
 		}
 	}
diff --git a/packages/api-common/source/rcp/utils.ts b/packages/api-common/source/rcp/utils.ts
index a943e118e..265f1357a 100644
--- a/packages/api-common/source/rcp/utils.ts
+++ b/packages/api-common/source/rcp/utils.ts
@@ -27,10 +27,11 @@ export const errorMessageMap = {
 export const prepareRcpError = (
 	id: Contracts.Api.RPC.Id,
 	errorCode: Contracts.Api.RPC.ErrorCode,
+	message?: string,
 ): Contracts.Api.RPC.Error => ({
 	error: {
 		code: errorCode,
-		message: errorMessageMap[errorCode],
+		message: message ?? errorMessageMap[errorCode],
 	},
 	id,
 	jsonrpc: "2.0",
diff --git a/packages/api-evm/source/actions/eth-get-uncle-count-by-block-hash.ts b/packages/api-evm/source/actions/eth-get-uncle-count-by-block-hash.ts
new file mode 100644
index 000000000..02c629550
--- /dev/null
+++ b/packages/api-evm/source/actions/eth-get-uncle-count-by-block-hash.ts
@@ -0,0 +1,27 @@
+import { inject, injectable } from "@mainsail/container";
+import { Contracts, Exceptions, Identifiers } from "@mainsail/contracts";
+
+@injectable()
+export class EthGetUncleCountByBlockHash implements Contracts.Api.RPC.Action {
+	@inject(Identifiers.Database.Service)
+	private readonly databaseService!: Contracts.Database.DatabaseService;
+
+	public readonly name: string = "eth_getUncleCountByBlockHash";
+
+	public readonly schema = {
+		$id: `jsonRpc_${this.name}`,
+		maxItems: 1,
+		minItems: 1,
+
+		prefixItems: [{ $ref: "prefixedHex" }], // TODO: Replace prefixedHex with prefixedBlockId
+		type: "array",
+	};
+
+	public async handle(parameters: [string]): Promise<string> {
+		if (!this.databaseService.hasCommitById(parameters[0].slice(2))) {
+			throw new Exceptions.RpcError("Block not found");
+		}
+
+		return `0x0`;
+	}
+}
diff --git a/packages/api-evm/source/actions/index.ts b/packages/api-evm/source/actions/index.ts
index c81b1f276..182e83c38 100644
--- a/packages/api-evm/source/actions/index.ts
+++ b/packages/api-evm/source/actions/index.ts
@@ -6,6 +6,7 @@ export * from "./eth-get-block-by-number.js";
 export * from "./eth-get-code.js";
 export * from "./eth-get-storage-at.js";
 export * from "./eth-get-transaction-count.js";
+export * from "./eth-get-uncle-count-by-block-hash.js";
 export * from "./net-listening.js";
 export * from "./net-peer-count.js";
 export * from "./web3-client-version.js";
diff --git a/packages/api-evm/source/service-provider.ts b/packages/api-evm/source/service-provider.ts
index 7ff0734f0..596959a20 100644
--- a/packages/api-evm/source/service-provider.ts
+++ b/packages/api-evm/source/service-provider.ts
@@ -11,6 +11,7 @@ import {
 	EthGetCodeAction,
 	EthGetStorageAtAction,
 	EthGetTransactionCount,
+	EthGetUncleCountByBlockHash,
 	NetListeningAction,
 	NetPeerCountAction,
 	Web3ClientVersionAction,
@@ -72,6 +73,7 @@ export class ServiceProvider extends AbstractServiceProvider<Server> {
 			this.app.resolve(EthGetCodeAction),
 			this.app.resolve(EthGetStorageAtAction),
 			this.app.resolve(EthGetTransactionCount),
+			this.app.resolve(EthGetUncleCountByBlockHash),
 			this.app.resolve(NetListeningAction),
 			this.app.resolve(NetPeerCountAction),
 			this.app.resolve(Web3ClientVersionAction),
diff --git a/packages/contracts/source/contracts/database.ts b/packages/contracts/source/contracts/database.ts
index a7bb9e1cd..90abe6f44 100644
--- a/packages/contracts/source/contracts/database.ts
+++ b/packages/contracts/source/contracts/database.ts
@@ -13,6 +13,7 @@ export interface DatabaseService {
 	getState(): State;
 	getCommit(height: number): Promise<Commit | undefined>;
 	getCommitById(id: string): Promise<Commit | undefined>;
+	hasCommitById(id: string): boolean;
 	findCommitBuffers(start: number, end: number): Promise<Buffer[]>;
 	readCommits(start: number, end: number): AsyncGenerator<Commit>;
 	findBlocks(start: number, end: number): Promise<Block[]>;
diff --git a/packages/database/source/database-service.ts b/packages/database/source/database-service.ts
index 1a6688209..b67b6a1f5 100644
--- a/packages/database/source/database-service.ts
+++ b/packages/database/source/database-service.ts
@@ -67,6 +67,10 @@ export class DatabaseService implements Contracts.Database.DatabaseService {
 		return undefined;
 	}
 
+	public hasCommitById(id: string): boolean {
+		return this.#getHeightById(id) !== undefined;
+	}
+
 	public async findCommitBuffers(start: number, end: number): Promise<Buffer[]> {
 		const heights: number[] = [];