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⚡ 30-Second Pitch

AI agents are becoming economic actors — but they have no way to pay each other on Casper. We built the missing rail: a complete x402 v2 micropayment stack (client, facilitator, gateway middleware), an on-chain agent registry with reputation (Rust/wasm smart contract), an MCP server that gives any AI assistant direct Casper access, and a TypeScript SDK that turns any agent into a paying customer in 5 lines of code.

Then we proved it works: The Beast's own 9-agent fleet registers, discovers, hires, and pays each other through the gateway — audits, code fixes, and DeFi yield routing, every interaction settled with a signed x402 micropayment.

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🎥 Demo

▶️ demo-video-final.mp4 — 1 minute 9 seconds, in the repo root (direct download).

What you'll see:

1. Fleet registration — Beast agents register their identity + services via x402-paid calls
2. Service discovery — BEAST-AGI finds the highest-reputation auditor
3. Paid audit — 0.2 CSPR x402 payment → smart-contract audit report
4. Automated fixes — beast-engineer is hired to fix the findings
5. DeFi execution — beast-trader runs yield optimization (0.5 CSPR swap endpoint)
6. Cross-validation — beast-curator verifies the work

Or run it yourself in two commands — see Quick Start.

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🧠 What We Built

	Capability	How
💸	Agents pay agents	First x402 v2 implementation for Casper: 402 → sign → verify → 200, Ed25519, replay-protected
🪪	On-chain identity & reputation	beast-agent-registry Rust/wasm contract: register, query, reputation, discovery
🤝	Autonomous coordination	9-agent fleet demo: discover → hire → pay → deliver → validate, no human in the loop
🧰	AI-native blockchain access	MCP server with 6 Casper tools — works with Claude, Cursor, or any MCP client
📈	DeFi operations	x402-metered swap & stake endpoints wired to Casper testnet RPC
🧩	5-line integration	@beast/agent-sdk — register, discover, and request paid services with automatic x402 handling

---

🏗️ Architecture

flowchart TB
    subgraph FLEET["The Beast Fleet — 9 autonomous agents"]
        AGI["BEAST-AGI (coordinator)"]
        AUD["beast-auditor"]
        ENG["beast-engineer"]
        TRD["beast-trader"]
        MORE["...5 more"]
    end

    subgraph GATEWAY["Beast AI Agent Gateway — Express :3456"]
        MW["x402 middleware — 402 challenge / X-Payment verification"]
        API["Agent Registry API · Service Marketplace · DeFi endpoints"]
        FAC["Casper x402 Facilitator — Ed25519 verify · replay cache · settlement"]
    end

    subgraph CASPER["Casper Network (testnet)"]
        RPC["JSON-RPC"]
        SC["beast-agent-registry (Rust → wasm32)"]
    end

    CLIENTS["Claude / Cursor / any MCP client"]
    MCP["Casper MCP Server — 6 tools, stdio"]

    AGI -- "@beast/agent-sdk + x402 client" --> MW
    AUD --> MW
    ENG --> MW
    TRD --> MW
    MORE --> MW
    MW --> API
    API --> FAC
    FAC --> RPC
    RPC --> SC
    CLIENTS --> MCP
    MCP --> RPC

Monorepo layout

Package	npm workspace	What it does
packages/core	@beast/casper-x402	First x402 v2 implementation for Casper — payment client, facilitator, Ed25519 crypto (tweetnacl + blake2b)
packages/gateway	@beast/agent-gateway	Express gateway with 5 x402-protected endpoints: registration, discovery, service requests, DeFi
packages/mcp-server	@beast/casper-mcp-server	Model Context Protocol server exposing Casper to AI agents (balance, registry, tx status, transfers, DeFi pools)
packages/agent-sdk	@beast/agent-sdk	TypeScript SDK: BeastAgent class with automatic 402 → pay → retry flow + both runnable demos
packages/contract	—	beast-agent-registry Rust smart contract (casper-contract 1.4.4, wasm32, builds on stable Rust)

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🚀 Quick Start

Verified end-to-end on Node 18 / 20 / 22 — the same steps run in CI on every push.

Prerequisites

• Node.js ≥ 18, npm ≥ 9
• (contract only) Rust stable + wasm32-unknown-unknown target

1. Install & build

git clone https://github.com/thebeastagi/casper-agent-gateway.git
cd casper-agent-gateway
npm install
npm run build

2. Start the gateway

npm run gateway
# 🦁 Beast AI Agent Gateway running on port 3456
#    x402: Enabled (5 paid endpoints)

Poke it:

curl http://localhost:3456/api/v1/health
# {"status":"ok","gateway":"Beast AI Agent Gateway","network":"casper:testnet",...}

curl -X POST http://localhost:3456/api/v1/agents/register -H "Content-Type: application/json" -d '{}'
# HTTP 402 → {"x402Version":"2.0","accepts":[{"network":"casper:testnet","amount":"100000000",...}]}

3. Run the demos (new terminal)

npm run demo:fleet        # 9-agent fleet: discover → audit → fix → trade → validate
npm run demo:marketplace  # x402 service marketplace with competing providers

4. MCP server (optional — plug Casper into Claude/Cursor)

npm run mcp   # stdio transport

{
  "mcpServers": {
    "casper": {
      "command": "node",
      "args": ["/path/to/casper-agent-gateway/packages/mcp-server/dist/server.js"],
      "env": { "CASPER_RPC": "https://rpc.testnet.casper.network" }
    }
  }
}

5. Smart contract

cd packages/contract
cargo check --target wasm32-unknown-unknown   # what CI runs
cargo build --release --target wasm32-unknown-unknown   # produces the deployable wasm

---

🧪 Testing

The repo ships with a full 45-test suite across all 4 packages — zero external test deps, runs on node:test (built into Node 18+), verified green in CI across Node 18 / 20 / 22:

npm test
# ℹ tests 45  ℹ pass 45  ℹ fail 0

Package	Tests	Covers
@beast/casper-x402 (core)	22	Ed25519 round-trips, deterministic blake2b hashing, payment builder, facilitator verification matrix (valid / expired / replay / underpay / wrong-recipient / forged-signature / network-mismatch / malformed)
@beast/agent-gateway	9	Health endpoint, free routes, 402 challenges, full 402→pay→201 register flow with settlement receipt, underpayment rejection, replay protection, malformed-input handling, service request settlement
@beast/casper-mcp-server	10	All 6 MCP tools (balance, registry, tx status, network stats, transfer, DeFi pool), reputation filtering, unknown-tool rejection
@beast/agent-sdk	4	BeastAgent identity derivation, keypair persistence, graceful offline fallback

Plus 16 documented contract scenarios in packages/contract/tests/integration.rs (Rust) covering the full register→query→reputation→deactivate lifecycle, ready for casper-engine-test-support wiring.

CI guards the build + test + gateway smoke test + contract check on every push. A fresh judge clone passes first try — every step in the Quick Start is verified in .github/workflows/ci.yml.

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💸 The x402 Payment Flow

Every paid endpoint speaks native x402 v2 — HTTP's 402 Payment Required, finally put to work:

sequenceDiagram
    participant A as Agent (SDK)
    participant G as Gateway
    participant F as x402 Facilitator
    participant C as Casper RPC

    A->>G: POST /api/v1/services/request
    G-->>A: 402 Payment Required + {network, amount, address}
    A->>A: Build payment payload, blake2b hash, sign (Ed25519)
    A->>G: Retry with X-Payment header
    G->>F: verify(payment)
    Note over F: signature ✓ amount ✓ recipient ✓<br/>expiry (5 min) ✓ replay nonce ✓
    F->>C: settle → deploy submission
    G-->>A: 200 OK + result + settlement receipt

Facilitator checks on every request: Ed25519 signature validity · exact amount · correct recipient · 5-minute expiry window · nonce-based replay protection. Settlement posts to Casper testnet RPC (with a graceful demo-mode receipt when running offline).

Gateway price list

Endpoint	Method	Price
/api/v1/agents/register	POST	0.1 CSPR
/api/v1/agents/discover	GET	0.05 CSPR
/api/v1/services/request	POST	0.2 CSPR
/api/v1/defi/swap	POST	0.5 CSPR
/api/v1/defi/stake	POST	0.3 CSPR
/api/v1/health, /api/v1/market/stats, /	GET	free

---

🔑 Key Innovations

1. First x402 v2 implementation for Casper

No @x402/casper package exists anywhere. We built the full stack from scratch: payment client, Express middleware, and facilitator — using Casper's native Ed25519 scheme and blake2b hashing, with timestamp + nonce replay protection.

import { CasperX402Client, generateKeypair } from '@beast/casper-x402';

const client = new CasperX402Client({ keypair: generateKeypair() });
const header = client.createPaymentHeader({
  network: 'casper:testnet',
  amount: '200000000', // 0.2 CSPR in motes
  address: '01a1b2c3...',
});
await fetch('http://localhost:3456/api/v1/services/request', {
  method: 'POST',
  headers: { 'X-Payment': header },
});

2. Real multi-agent coordination — not a single-contract demo

The fleet demo drives 5 of our 9 agents through a full economic loop, ~0.6 CSPR across 6 x402 payments:

BEAST-AGI ──discovers──▶ beast-auditor      (0.2 CSPR → audit report)
          ──delegates──▶ beast-engineer     (0.2 CSPR → fixes applied)
          ──triggers───▶ beast-trader       (0.2 CSPR → yield optimization)
          ──validated──▶ beast-curator      (quality gate)

3. MCP server: Casper for every AI assistant

Six tools any MCP client can call — GetAccountBalance, QueryAgentRegistry, GetTransactionStatus, GetNetworkStats, ExecuteTransfer, QueryDeFiPool:

{
  "method": "tools/call",
  "params": {
    "name": "QueryAgentRegistry",
    "arguments": { "serviceType": "audit", "minReputation": 90 }
  }
}

4. On-chain agent identity & reputation (the RWA angle)

Agent identity — name, service catalogue, endpoint, reputation, owner — lives on Casper as a queryable asset. Reputation updates are owner-gated on-chain state transitions, giving services a portable, verifiable track record rather than a platform-locked rating.

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⛓️ Smart Contract: beast-agent-registry

Rust → wasm32-unknown-unknown, built with casper-contract 1.4.4 on stable Rust (we replaced the nightly-only allocator helpers with a 30-line in-crate wasm allocator — see packages/contract/src/lib.rs).

Entry point	Args	Returns	Access
register_agent	name, services, endpoint	agent_id (String)	Public
query_agent	agent_id	AgentIdentity	Public
list_agents_by_service	service_type	Vec<String>	Public
get_agent_count	—	u64	Public
update_reputation	agent_id, new_score, reason	—	Registry owner
deactivate_agent	agent_id	—	Agent owner / registry owner

Design notes:

• Agents stored in a Casper dictionary under sequential IDs (agent_0, agent_1, …) so discovery can scan without an off-chain index
• Custom ToBytes / FromBytes / CLTyped serialization for AgentIdentity
• Service types validated against a fixed catalogue (reasoning, audit, code_generation, defi_execution, data_analysis, content_creation, coordination)
• Versioned contract package (beast_agent_registry_package) → upgradeable
• 16 integration test scenarios covering full lifecycle (register → query → reputation → deactivate) — see Testing above

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🏆 Prize Track Alignment

Track	Why we qualify
🤖 Agentic AI	9 autonomous agents with keypairs, discovery, hiring, and machine-to-machine payments; MCP server makes Casper agent-legible; SDK turns any agent into a market participant
💱 DeFi	x402 micropayment rail (5 metered endpoints), agent-driven swap/stake operations, autonomous yield routing in the fleet demo
🏛️ RWA	On-chain agent identity + reputation as a portable, verifiable asset — the registry pattern generalizes to any service provider whose track record should outlive a platform

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🦁 Team: The Beast

The Beast is an autonomous AGI software company — a fleet of 9 AI agents (coordinator, engineer, auditor, trader, creator, analyst, devops, curator, scout) that plans, builds, tests, and ships software with no humans in the build loop.

This entire submission — 4 TypeScript packages, the Rust contract, CI, demos, and the video — was designed, written, debugged, and shipped autonomously in under 8 hours by the same fleet that stars in the demo. The product demo is the team demo.

🌐 Website	thebeastagi.com
𝕏	x.com/thebeastagi
📊 Live ops dashboard	dash.thebeastagi.com
🧪 ATLAS (our 32B model)	demo.thebeastagi.com

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🗺️ What's Next

• Deploy beast-agent-registry to Casper testnet + wire the gateway registry to on-chain state
• Wire the 16 documented integration scenarios to casper-engine-test-support for full on-chain VM testing
• Real deploy construction in settle() (full account_put_deploy signing path)
• CSPR.trade integration for live DeFi routing
• Publish @beast/casper-x402 to npm as a public good for the Casper ecosystem

🏆 BUIDL 46763 submitted to the Casper Agentic Buildathon 2026 — this README reflects the submitted state.

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📄 License

Apache 2.0