diff --git a/src/entities/APIClient.ts b/src/entities/APIClient.ts
new file mode 100644
index 0000000..6466c78
--- /dev/null
+++ b/src/entities/APIClient.ts
@@ -0,0 +1,12 @@
+/**
+ * Information about an API client
+ * 
+ * @author Pierre HUBERT
+ */
+
+export interface APIClient {
+	id: number,
+	name: string,
+	token: string,
+	domain: string,
+}
\ No newline at end of file
diff --git a/src/helpers/APIHelper.ts b/src/helpers/APIHelper.ts
index 9e1568b..0b7143c 100644
--- a/src/helpers/APIHelper.ts
+++ b/src/helpers/APIHelper.ts
@@ -1,3 +1,6 @@
+import { APIClient } from "../entities/APIClient";
+import { DatabaseHelper } from "./DatabaseHelper";
+
 /**
  * API Helper
  * 
@@ -6,4 +9,36 @@
 
 export class APIHelper {
 	
+	private static SERVICES_TABLE = "comunic_api_services_tokens";
+
+	/**
+	 * Get information about an API client
+	 * 
+	 * @param name The name of the client to get
+	 * @param token The token of the client to get
+	 * @returns Information about the client or null
+	 * if none found
+	 */
+	public static async GetClient(name: string, token: string) : Promise<APIClient | null> {
+		
+		const entry = await DatabaseHelper.QueryRow({
+			table: this.SERVICES_TABLE,
+			where: {
+				service_name: name,
+				token: token
+			},
+			limit: 1
+		});
+
+		if(entry == null)
+			return null;
+
+		return {
+			id: entry.id,
+			name: entry.service_name,
+			token: entry.token,
+			domain: entry.client_domain
+		};
+	}
+
 }
\ No newline at end of file
diff --git a/src/helpers/DatabaseHelper.ts b/src/helpers/DatabaseHelper.ts
index 2f02282..d480fde 100644
--- a/src/helpers/DatabaseHelper.ts
+++ b/src/helpers/DatabaseHelper.ts
@@ -7,6 +7,12 @@ import { conf } from "./ConfigHelper";
  * @author Pierre HUBERT
  */
 
+export interface QueryInformation {
+	table: string,
+	where ?: Object,
+	limit ?: number,
+}
+
 export class DatabaseHelper {
 
 	private static connection : Connection;
@@ -38,4 +44,67 @@ export class DatabaseHelper {
 		})
 	}
 
+	/**
+	 * Query the database (SELECT)
+	 * 
+	 * @param info Information about the query
+	 */
+	static async Query(info: QueryInformation) : Promise<Array<any>> {
+		// Prepare SQL request
+		let request = "SELECT * FROM " + info.table;
+		let args = [];
+
+		// Add where arguments
+		if(info.where) {
+			request += " WHERE ";
+
+			for(const k in info.where) {
+				if(!info.where.hasOwnProperty(k))
+					continue;
+				const v = info.where[k];
+
+				request += k;
+				request += v.startsWith("%") || v.endsWith("%") ? " LIKE " : " = "
+				request += "? AND "
+
+				args.push(v);
+			};
+
+			// Remove the last (useless) AND
+			request = request.substr(0, request.length - 4)
+		}
+
+		// Limit (if any)
+		if(info.limit)
+			request += " LIMIT " + info.limit;
+
+		
+		// Execute request
+		return await new Promise((resolve, reject) => {
+			this.connection.query( request, args, (err, result, fields) => {
+				if(err) {
+					reject(err);
+					return;
+				}
+
+				resolve(result);
+			});
+		});
+	}
+
+	/**
+	 * Query a single row on the database
+	 * 
+	 * @param info Information about the request
+	 * @returns First matching row / null if none found
+	 */
+	static async QueryRow(info : QueryInformation) : Promise<any | null> {
+		info.limit = 1;
+		const result = await this.Query(info);
+
+		if(result.length == 0)
+			return null;
+		
+		return result[0];
+	}
 }
\ No newline at end of file