diff --git a/.astro/content-assets.mjs b/.astro/content-assets.mjs
deleted file mode 100644
index 2b8b823..0000000
--- a/.astro/content-assets.mjs
+++ /dev/null
@@ -1 +0,0 @@
-export default new Map();
\ No newline at end of file
diff --git a/.astro/content-modules.mjs b/.astro/content-modules.mjs
deleted file mode 100644
index 2b8b823..0000000
--- a/.astro/content-modules.mjs
+++ /dev/null
@@ -1 +0,0 @@
-export default new Map();
\ No newline at end of file
diff --git a/.astro/data-store.json b/.astro/data-store.json
deleted file mode 100644
index daa2b96..0000000
--- a/.astro/data-store.json
+++ /dev/null
@@ -1 +0,0 @@
-[["Map",1,2],"meta::meta",["Map",3,4,5,6],"astro-version","5.7.5","astro-config-digest","{\"root\":{},\"srcDir\":{},\"publicDir\":{},\"outDir\":{},\"cacheDir\":{},\"compressHTML\":true,\"base\":\"/\",\"trailingSlash\":\"ignore\",\"output\":\"static\",\"scopedStyleStrategy\":\"attribute\",\"build\":{\"format\":\"directory\",\"client\":{},\"server\":{},\"assets\":\"_astro\",\"serverEntry\":\"entry.mjs\",\"redirects\":true,\"inlineStylesheets\":\"auto\",\"concurrency\":1},\"server\":{\"open\":false,\"host\":false,\"port\":4321,\"streaming\":true,\"allowedHosts\":[]},\"redirects\":{},\"image\":{\"endpoint\":{\"route\":\"/_image\"},\"service\":{\"entrypoint\":\"astro/assets/services/sharp\",\"config\":{}},\"domains\":[],\"remotePatterns\":[]},\"devToolbar\":{\"enabled\":true},\"markdown\":{\"syntaxHighlight\":{\"type\":\"shiki\",\"excludeLangs\":[\"math\"]},\"shikiConfig\":{\"langs\":[],\"langAlias\":{},\"theme\":\"github-dark\",\"themes\":{},\"wrap\":false,\"transformers\":[]},\"remarkPlugins\":[],\"rehypePlugins\":[],\"remarkRehype\":{},\"gfm\":true,\"smartypants\":true},\"security\":{\"checkOrigin\":true},\"env\":{\"schema\":{},\"validateSecrets\":false},\"experimental\":{\"clientPrerender\":false,\"contentIntellisense\":false,\"responsiveImages\":false,\"headingIdCompat\":false,\"preserveScriptOrder\":false},\"legacy\":{\"collections\":false}}"]
\ No newline at end of file
diff --git a/.astro/settings.json b/.astro/settings.json
deleted file mode 100644
index 5b2b775..0000000
--- a/.astro/settings.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-	"_variables": {
-		"lastUpdateCheck": 1745454555490
-	}
-}
\ No newline at end of file
diff --git a/.astro/types.d.ts b/.astro/types.d.ts
deleted file mode 100644
index f964fe0..0000000
--- a/.astro/types.d.ts
+++ /dev/null
@@ -1 +0,0 @@
-/// <reference types="astro/client" />
diff --git a/.gitignore b/.gitignore
index 28b9a40..0966b99 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 # build output
 dist/
 .output/
+.astro/
 
 # dependencies
 node_modules/
diff --git a/astro.config.mjs b/astro.config.mjs
index e762ba5..245b4b2 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -1,5 +1,7 @@
 // @ts-check
-import { defineConfig } from 'astro/config';
+import { defineConfig } from "astro/config";
 
 // https://astro.build/config
-export default defineConfig({});
+export default defineConfig({
+  output: "server",
+});
diff --git a/src/pages/api/accounts/[id]/index.ts b/src/pages/api/accounts/[id]/index.ts
index e69de29..2479188 100644
--- a/src/pages/api/accounts/[id]/index.ts
+++ b/src/pages/api/accounts/[id]/index.ts
@@ -0,0 +1,22 @@
+import type { APIRoute } from "astro";
+import { accounts } from "../../../../data/store";
+
+export const GET: APIRoute = async ({ params }) => {
+  const account = accounts.find((a) => a.id === params.id);
+
+  if (!account) {
+    return new Response(JSON.stringify({ error: "Account not found" }), {
+      status: 404,
+      headers: {
+        "Content-Type": "application/json",
+      },
+    });
+  }
+
+  return new Response(JSON.stringify(account), {
+    status: 200,
+    headers: {
+      "Content-Type": "application/json",
+    },
+  });
+};
diff --git a/src/pages/api/accounts/[id]/transactions/index.ts b/src/pages/api/accounts/[id]/transactions/index.ts
index e69de29..bb8234f 100644
--- a/src/pages/api/accounts/[id]/transactions/index.ts
+++ b/src/pages/api/accounts/[id]/transactions/index.ts
@@ -0,0 +1,15 @@
+import type { APIRoute } from "astro";
+import { transactions } from "../../../../../data/store";
+
+export const GET: APIRoute = async ({ params }) => {
+  const accountTransactions = transactions.filter(
+    (t) => t.accountId === params.id
+  );
+
+  return new Response(JSON.stringify(accountTransactions), {
+    status: 200,
+    headers: {
+      "Content-Type": "application/json",
+    },
+  });
+};
diff --git a/src/pages/api/transactions/[id]/index.ts b/src/pages/api/transactions/[id]/index.ts
index e69de29..8b778e3 100644
--- a/src/pages/api/transactions/[id]/index.ts
+++ b/src/pages/api/transactions/[id]/index.ts
@@ -0,0 +1,82 @@
+import type { APIRoute } from "astro";
+import { transactions, accounts } from "../../../../data/store";
+import type { Transaction } from "../../../../types";
+
+export const PUT: APIRoute = async ({ request, params }) => {
+  try {
+    const updates = (await request.json()) as Partial<Transaction>;
+    const transactionIndex = transactions.findIndex((t) => t.id === params.id);
+
+    if (transactionIndex === -1) {
+      return new Response(JSON.stringify({ error: "Transaction not found" }), {
+        status: 404,
+        headers: { "Content-Type": "application/json" },
+      });
+    }
+
+    const oldTransaction = transactions[transactionIndex];
+    const account = accounts.find((a) => a.id === oldTransaction.accountId);
+
+    if (!account) {
+      return new Response(JSON.stringify({ error: "Account not found" }), {
+        status: 404,
+        headers: { "Content-Type": "application/json" },
+      });
+    }
+
+    // Revert old transaction amount from account balance
+    account.balance -= oldTransaction.amount;
+
+    // Update transaction with new data
+    const updatedTransaction: Transaction = {
+      ...oldTransaction,
+      ...updates,
+      id: params.id, // Ensure ID doesn't change
+    };
+
+    // Add new amount to account balance
+    account.balance += updatedTransaction.amount;
+
+    // Update transaction in array
+    transactions[transactionIndex] = updatedTransaction;
+
+    return new Response(JSON.stringify(updatedTransaction), {
+      status: 200,
+      headers: { "Content-Type": "application/json" },
+    });
+  } catch (error) {
+    return new Response(JSON.stringify({ error: "Invalid request body" }), {
+      status: 400,
+      headers: { "Content-Type": "application/json" },
+    });
+  }
+};
+
+export const DELETE: APIRoute = async ({ params }) => {
+  const transactionIndex = transactions.findIndex((t) => t.id === params.id);
+
+  if (transactionIndex === -1) {
+    return new Response(JSON.stringify({ error: "Transaction not found" }), {
+      status: 404,
+      headers: { "Content-Type": "application/json" },
+    });
+  }
+
+  const transaction = transactions[transactionIndex];
+  const account = accounts.find((a) => a.id === transaction.accountId);
+
+  if (!account) {
+    return new Response(JSON.stringify({ error: "Account not found" }), {
+      status: 404,
+      headers: { "Content-Type": "application/json" },
+    });
+  }
+
+  // Update account balance
+  account.balance -= transaction.amount;
+
+  // Remove transaction from array
+  transactions.splice(transactionIndex, 1);
+
+  return new Response(null, { status: 204 });
+};
diff --git a/src/pages/api/transactions/index.ts b/src/pages/api/transactions/index.ts
index e69de29..91a2b5b 100644
--- a/src/pages/api/transactions/index.ts
+++ b/src/pages/api/transactions/index.ts
@@ -0,0 +1,56 @@
+import type { APIRoute } from "astro";
+import { transactions, accounts } from "../../../data/store";
+import type { Transaction } from "../../../types";
+
+export const POST: APIRoute = async ({ request }) => {
+  try {
+    const transaction = (await request.json()) as Omit<Transaction, "id">;
+
+    // Validate required fields
+    if (
+      !transaction.accountId ||
+      !transaction.date ||
+      !transaction.description ||
+      transaction.amount === undefined
+    ) {
+      return new Response(
+        JSON.stringify({ error: "Missing required fields" }),
+        {
+          status: 400,
+          headers: { "Content-Type": "application/json" },
+        }
+      );
+    }
+
+    // Validate account exists
+    const account = accounts.find((a) => a.id === transaction.accountId);
+    if (!account) {
+      return new Response(JSON.stringify({ error: "Account not found" }), {
+        status: 404,
+        headers: { "Content-Type": "application/json" },
+      });
+    }
+
+    // Create new transaction with generated ID
+    const newTransaction: Transaction = {
+      ...transaction,
+      id: (transactions.length + 1).toString(), // Simple ID generation for demo
+    };
+
+    // Update account balance
+    account.balance += transaction.amount;
+
+    // Add to transactions array
+    transactions.push(newTransaction);
+
+    return new Response(JSON.stringify(newTransaction), {
+      status: 201,
+      headers: { "Content-Type": "application/json" },
+    });
+  } catch (error) {
+    return new Response(JSON.stringify({ error: "Invalid request body" }), {
+      status: 400,
+      headers: { "Content-Type": "application/json" },
+    });
+  }
+};