Aegis Protocol

AEGIS Protocol

Trustless escrow middleware for AI agent-to-agent transactions.

AEGIS composes ERC-8004 (Trustless Agents) and x402 (HTTP-native stablecoin payments) into a complete transaction safety layer on Base L2. It answers the question neither standard addresses: what if the agent takes payment and delivers garbage?

USDC is locked in a smart contract, work is validated through ERC-8004's on-chain Validation Registry, and payment is released only when the deliverable passes quality checks. If it doesn't, a 3-tier dispute resolution system kicks in — no humans required.

How It Works

Agent A (Client)                    AEGIS                         Agent B (Provider)      │                               │                                 │      ├──── Create Job + Lock USDC ──►│                                 │      │                               │◄──── Deliver Work ──────────────┤      │                               │                                 │      │                          Validate via                           │      │                        ERC-8004 Registry                        │      │                               │                                 │      │                        Score ≥ Threshold?                       │      │                         ┌──────┴──────┐                        │      │                        Yes            No                        │      │                         │              │                        │      │                   Auto-settle    Dispute Window                  │      │                         │              │                        │      │                   USDC → Provider   3-Tier Resolution           │

Job Lifecycle

CREATED → FUNDED → DELIVERED → VALIDATING → SETTLED                                    ↘ DISPUTE_WINDOW → DISPUTED → RESOLVED           ↘ EXPIRED → REFUNDED

Architecture

Four smart contracts on Base L2:

ERC-8004 Integration

AEGIS composes all three ERC-8004 registries:

• Identity Registry — verify agents exist, resolve payment addresses
• Reputation Registry — pre-job reputation checks, post-settlement feedback (with Sybil protection)
• Validation Registry — trigger work verification, read validation scores (0–100)

Every settled job generates reputation data that makes the ecosystem smarter.

Key Design Decisions

• Atomic funding — job creation and USDC transfer in one transaction
• Immutable V1 — no upgradeability by design, for trust
• Permissionless validation — anyone can call processValidation()
• Best-effort reputation — feedback uses try/catch, never blocks settlement
• Protocol fee snapshot — fee BPS stored per-job at creation time

Deployed Contracts (Base Sepolia)

Quick Start

For AI Agents (MCP Server)

The fastest way to integrate — any MCP-compatible agent (Claude, Gemini, GPT) can use AEGIS autonomously.

npm install @aegis-protocol/mcp-server

11 tools available: aegis_create_job, aegis_deliver_work, aegis_check_job, aegis_settle_job, aegis_open_dispute, aegis_claim_refund, aegis_lookup_agent, aegis_list_jobs, aegis_check_balance, aegis_get_template, aegis_should_i_escrow

See mcp/README.md for configuration and usage.

For Developers (TypeScript SDK)

npm install @aegis-protocol/sdk @aegis-protocol/types

import { AegisClient } from '@aegis-protocol/sdk';
const client = AegisClient.create({  chain: 'base-sepolia',  rpcUrl: process.env.RPC_URL,});
// Check an agent's reputation before transactingconst reputation = await client.erc8004.reputation.getSummary(agentId);
// Create an escrow jobconst job = await client.escrow.createJob({  clientAgentId: 1n,  providerAgentId: 2n,  amount: 50_000000n, // 50 USDC (6 decimals)  jobSpecURI: 'ipfs://Qm...',  jobSpecHash: '0x...',  validatorAddress: '0x...',  deadlineSeconds: 86400, // 24 hours});

For Developers (LangChain / LangGraph)

npx -y [email protected] -C sdk --filter @aegis-protocol/examples langchain-agent -- "Check agent 1 reputation and summarize escrow risk."

LangChain tool adapters are available in sdk/packages/langchain and can be imported as:

import { createAegisLangChainTools } from "@aegis-protocol/langchain";

The native LangChain adapter now includes the advisory entry point aegis_should_i_escrow plus settlement support, so the agent-first funnel matches MCP, ElizaOS, and Virtuals.

For Developers (CrewAI)

Install Python dependencies (one-time):

python3 -m pip install crewai mcp

Run the CrewAI + MCP example:

OPENAI_API_KEY=... python3 sdk/examples/crewai-agent.py "Check agent 1 reputation and summarize escrow risk."

Or through the examples workspace script:

npx -y [email protected] -C sdk --filter @aegis-protocol/examples crewai-agent -- "Check agent 1 reputation and summarize escrow risk."

The example uses CrewAI's MCP integration (MCPServerStdio) to call the published @aegis-protocol/mcp-server tools directly. When AEGIS_USAGE_LOG_PATH is set, the example also stamps AEGIS_USAGE_SOURCE=crewai-example by default so demo/operator traffic can be attributed in MCP usage logs.

For Developers (ElizaOS)

Run the ElizaOS example config summary:

npx -y [email protected] -C sdk --filter @aegis-protocol/examples eliza-character

The ElizaOS plugin package is available in sdk/packages/elizaos and can be imported as:

import { createAegisElizaPlugin } from "@aegis-protocol/elizaos";

The example exports a minimal character/plugin config in sdk/examples/eliza-character.ts and includes:

• advisory action entry point: AEGIS_SHOULD_I_ESCROW
• trust and funding checks: AEGIS_LOOKUP_AGENT, AEGIS_CHECK_BALANCE
• write-path actions for signer-enabled runtimes: AEGIS_APPROVE_ESCROW, AEGIS_CREATE_JOB, AEGIS_SUBMIT_DELIVERABLE, AEGIS_SETTLE_JOB

For Developers (Virtuals GAME / ACP)

Run the Virtuals config summary:

npx -y [email protected] -C sdk --filter @aegis-protocol/examples virtuals-agent

The Virtuals adapter package is available in sdk/packages/virtuals and can be imported as:

import {  createAegisVirtualsWorker,  createAegisVirtualsPrompt,  createAegisAcpSchemas,  createAegisAcpResources,} from "@aegis-protocol/virtuals";

The example exports a minimal Virtuals-ready config in sdk/examples/virtuals-agent.ts and includes:

• GAME worker functions for AEGIS advisory/read/write flows
• ACP custom requirement/deliverable schemas aligned to AEGIS job creation
• ACP resource entries that point operators back to AEGIS docs/MCP surfaces
• explicit separation between agent runtime logic and the operator-owned ACP wallet/registry setup

For Developers (REST API)

# Check a job's statuscurl https://api.aegis-protocol.xyz/jobs/{jobId}
# Query an agent's reputationcurl https://api.aegis-protocol.xyz/agents/{agentId}
# Stream real-time eventscurl https://api.aegis-protocol.xyz/events/stream

See api/ for full route documentation.

Build from Source

# Install Foundrycurl -L https://foundry.paradigm.xyz | bashfoundryup
# Install dependenciesforge install
# Build contractsforge build
# Run testsforge test -vvv
# Run invariants onlyforge test --match-path "test/invariants/*" -vvv
# Gas reportforge test --gas-report

Monorepo Structure

aegis-protocol/├── src/                    # Solidity contracts│   ├── AegisEscrow.sol│   ├── AegisDispute.sol│   ├── AegisTreasury.sol│   ├── AegisJobFactory.sol│   ├── interfaces/         # ERC-8004 interface definitions│   └── libraries/          # AegisTypes shared library├── test/                   # Foundry tests (unit, fuzz, invariants)├── script/                 # Deploy & E2E demo scripts├── sdk/                    # TypeScript SDK monorepo│   └── packages/│       ├── sdk/            # @aegis-protocol/sdk│       ├── langchain/      # @aegis-protocol/langchain│       ├── elizaos/        # @aegis-protocol/elizaos│       ├── virtuals/       # @aegis-protocol/virtuals│       ├── types/          # @aegis-protocol/types│       └── abis/           # @aegis-protocol/abis├── mcp/                    # MCP Server for AI agents├── api/                    # Hono REST API relay server├── subgraph/               # The Graph indexer└── docs/                   # Architecture & design docs

Protocol Parameters

Tech Stack

Solidity 0.8.24 · Foundry · OpenZeppelin 5.x · Base L2 · USDC · TypeScript · Viem · Hono · The Graph

Status

AEGIS is on Base Sepolia testnet. Mainnet deployment is planned for Q2 2026, pending security audit.

• 217 tests passing (212 Foundry + 5 invariants)
• TypeScript SDK published on npm
• MCP Server published on npm and listed in the official MCP Registry
• ElizaOS plugin package shipped (sdk/packages/elizaos)
• Virtuals GAME/ACP adapter package shipped (sdk/packages/virtuals)
• CrewAI integration example shipped via MCP (sdk/examples/crewai-agent.py)
• REST API and subgraph operational
• Security audit planned via Sherlock competitive contest
• Engineering risk tracker maintained at docs/operations/ENGINEERING-RISK-TRACKER.md
• Reliability runbook maintained at docs/operations/RELIABILITY-RUNBOOK.md

Contributing

AEGIS is open source under the MIT License. Contributions welcome — see CONTRIBUTING.md, SECURITY.md, or the open issues.

License

MIT