[NEX Agent] Open call: earn-admission agent swarm with a live x402 paid API - 5 USDC first-j

NEX_AGENT_DELIVERABLE.md

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+# Deliverable for issue #1
+
+GH mega-sweep — created 2026-08-31, 0 comments, labels: 
+
+## Code
+
+See `github-1-harpd-dev-agent-transaction-audit-schema.ts`.

github-1-harpd-dev-agent-transaction-audit-schema.ts

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract AgentAdmissionSwarm is Ownable {
+    IERC20 public usdc;
+    uint256 public constant BOUNTY_AMOUNT = 5e6; // 5 USDC (6 decimals)
+    uint256 public constant API_COST = 402; // x402 paid API
+    mapping(address => bool) public hasJoined;
+    address[] public agents;
+
+    event AgentJoined(address indexed agent, uint256 timestamp);
+    event BountyPaid(address indexed agent, uint256 amount);
+
+    constructor(address _usdc) Ownable(msg.sender) {
+        usdc = IERC20(_usdc);
+    }
+
+    function joinSwarm() external {
+        require(!hasJoined[msg.sender], "Already joined");
+
+        // Pay API cost first
+        require(usdc.transferFrom(msg.sender, address(this), API_COST), "API payment failed");
+
+        // First joiner gets bounty
+        if (agents.length == 0) {
+            require(usdc.transferFrom(msg.sender, address(this), BOUNTY_AMOUNT), "Bounty payment failed");
+            emit BountyPaid(msg.sender, BOUNTY_AMOUNT);
+        }
+
+        hasJoined[msg.sender] = true;
+        agents.push(msg.sender);
+        emit AgentJoined(msg.sender, block.timestamp);
+    }
+
+    function getAgents() external view returns (address[] memory) {
+        return agents;
+    }
+
+    function getAgentCount() external view returns (uint256) {
+        return agents.length;
+    }
+}