Building the First X402 Protocol on Monad: 10 Minutes to Deadline with Dead Hardware

HTTP 402 "Payment Required" was proposed in 1996. For almost 30 years, it remained unused — a specification without implementation. In late 2025, Coinbase, Cloudflare, and the Linux Foundation announced joint work on x402. In early 2026, Binance and XRP Ledger followed. The industry is moving toward programmable, agent-ready payments. But all of them released documentation, not code. I decided to build it. The Problem AI agents cannot pay for services. Every API call, every database query, every compute cycle requires manual intervention. API keys. Centralized billing. Human approval. This breaks the promise of autonomous agents. If an agent can think, it should be able to pay. The Solution: AxilProtocolV1 AxilProtocolV1 is a smart contract on Monad that implements the x402 standard with automatic reward distribution, replay protection, and gas optimization. Intent-Based Payments Every transaction starts with an intent — a packed bytes32 value: bytes32 packedIntent = bytes32(uint256(bu