Nano Empire – Open-source MCP gateway with x402 micropayments and A2A routing

We built Nano Empire to solve the monetization bottleneck for AI agent tools. Most MCP servers either burn developer API credits for free or hide behind $20/month SaaS tiers that autonomous agents can't subscribe to.

We wrapped FastMCP with the x402 micropayment standard over Solana USDC and added Cerberus—a sub-millisecond UCB1 Multi-Armed Bandit router with a Bloom filter replay guard.

What it does:

1. Tool Gateway: 12 live tools (security scanning, semantic embeddings, crypto price oracles, headless DOM extract).
2. Pay-per-call: Tools cost $0.01 to $0.50 USDC per call. No API keys, no monthly subscription. Agents attach an x-402-receipt header.
3. Agent-to-Agent (A2A) Delegation: Any agent can POST to /a2a/delegate to subcontract heavy compute to our local GPU cluster or fallback frontier models.
4. Dogfood Proof: Our agent just ran a full 8-phase self-demonstration—discovering the tools, hitting the paywall, settling on-chain, and capturing an arbitrage task in 1,022ms (p99 latency 0.02ms for 100 concurrent requests).

The gateway is live in production:

• Endpoint: https://nano-empire-mcp-1064490927432.us-central1.run.app
• Manifest: /mcp/manifest
• Agent Card: /.well-known/agent-card.json
• GPU Price Tape: /tape (OCPI benchmark vs AWS/CoreWeave)
• llms.txt: /llms.txt

Would love your feedback on the latency model and x402 payment flow.