diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0881376
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+# crypto
+crypto code development
diff --git a/eth/collector.sol b/eth/collector.sol
new file mode 100644
index 0000000..ebc2c11
--- /dev/null
+++ b/eth/collector.sol
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity >=0.8.2 <0.9.0;
+
+/**
+ * @title Collector
+ * @dev Retrieve value and store
+ * @custom:dev-run-script ./scripts/deploy_with_ethers.ts
+ */
+contract Collector { // 0x45EB13b669b2E503914FB4855f97CaEA10cD8eA6
+    address public owner;
+    uint256 public balance;
+
+    constructor() {
+        owner = msg.sender;
+    }
+
+    // Accept any incoming amount
+    receive() payable external {
+        balance += msg.value;
+    }
+}