diff --git a/src/app/api/index/donation/route.ts b/src/app/api/index/donation/route.ts
new file mode 100644
index 00000000..b783ae53
--- /dev/null
+++ b/src/app/api/index/donation/route.ts
@@ -0,0 +1,105 @@
+import { NextResponse } from "next/server";
+import { type Hex, decodeEventLog, encodeEventTopics } from "viem";
+import { publicClient } from "../../../../../lib/viem";
+import { createServerClient } from "../../../../../lib/supabase";
+import {
+  storyFactoryAbi,
+  donationEvent,
+} from "../../../../../lib/contracts/abi";
+import type { Database } from "../../../../../lib/supabase";
+
+/** Donation event topic0 */
+const DONATION_TOPIC = encodeEventTopics({
+  abi: [donationEvent],
+  eventName: "Donation",
+})[0];
+
+function error(message: string, status = 400) {
+  return NextResponse.json({ error: message }, { status });
+}
+
+export async function POST(req: Request) {
+  const body = await req.json();
+  const txHash = body.txHash as Hex | undefined;
+
+  if (!txHash || !/^0x[0-9a-fA-F]{64}$/.test(txHash)) {
+    return error("Missing or invalid txHash");
+  }
+
+  // 1. Fetch receipt
+  let receipt;
+  try {
+    receipt = await publicClient.getTransactionReceipt({ hash: txHash });
+  } catch {
+    return error("Failed to fetch transaction receipt", 502);
+  }
+
+  if (receipt.status !== "success") {
+    return error("Transaction failed");
+  }
+
+  // 2. Find Donation event log by event signature (topic0)
+  const donationLog = receipt.logs.find(
+    (log) => log.topics[0] === DONATION_TOPIC
+  );
+
+  if (!donationLog) {
+    return error("Donation event not found in receipt");
+  }
+
+  // 3. Decode event
+  let decoded;
+  try {
+    decoded = decodeEventLog({
+      abi: storyFactoryAbi,
+      data: donationLog.data,
+      topics: donationLog.topics,
+    });
+  } catch {
+    return error("Failed to decode Donation event");
+  }
+
+  if (decoded.eventName !== "Donation") {
+    return error("Unexpected event type");
+  }
+
+  const { storylineId, donor, amount } = decoded.args;
+
+  // 4. Get block timestamp
+  let blockTimestamp: bigint;
+  try {
+    const block = await publicClient.getBlock({
+      blockNumber: receipt.blockNumber,
+    });
+    blockTimestamp = block.timestamp;
+  } catch {
+    return error("Failed to fetch block", 502);
+  }
+
+  // 5. Upsert to Supabase
+  const supabase = createServerClient();
+  if (!supabase) {
+    return error("Supabase not configured", 500);
+  }
+
+  const row: Database["public"]["Tables"]["donations"]["Insert"] = {
+    storyline_id: Number(storylineId),
+    donor_address: donor.toLowerCase(),
+    amount: amount.toString(), // wei string to avoid precision loss
+    block_timestamp: new Date(Number(blockTimestamp) * 1000).toISOString(),
+    tx_hash: txHash.toLowerCase(),
+    log_index: donationLog.logIndex!,
+  };
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const { error: dbError } = await (supabase.from("donations") as any).upsert(
+    row,
+    { onConflict: "tx_hash,log_index" }
+  );
+
+  if (dbError) {
+    return error(`Database error: ${dbError.message}`, 500);
+  }
+
+  return NextResponse.json({ success: true });
+}