SatGate – Economic Firewall for AI Agents MCP server

SatGate

Observe, control and admit AI agent traffic Every allow or deny comes with a signed receipt

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SatGate is a gateway in front of APIs and MCP tools. It meters agent and MCP traffic (Observe), enforces owner budgets before work runs (Control), and charges external agents on the routes you choose (Admit; the Charge policy in the dashboard). Every allow or deny comes with a signed receipt.

Try it as an agent. This hosted route costs 10 sats or 0.01 USDC, and each payment buys one request:

curl -i https://mcp-prod-final.satgate.cloud/paid/premium

The unpaid call returns HTTP 402 with a Lightning invoice, a USDC-on-Base (x402) offer and the terms. Agent instructions are in llms.txt.

Build Agents with SatGate

SatGate's developer primitive is three calls: issue(), pay(), and verify().

import os
from satgate import SatGate

satgate = SatGate(api_key=os.getenv("SATGATE_API_KEY"))

capability = satgate.issue(
    task="research market prices",
    agent="research-agent",
    allow=["mcp:web.search", "api:prices.read"],
    budget_usd=25,
    expires_in="1h",
)

receipt = satgate.pay(
    upstream="https://api.example.com/search",
    capability=capability,
    max_usd=4.20,
)

verified = satgate.verify(receipt)
print(verified.decision, verified.evidence_pack_id)

Install today:

pip install satgate
npm install @satgate/sdk

The public packages install today; the issue/pay/verify API namespace is in private beta. Calls without private-beta access raise a structured error instead of returning fake receipts:

SatGateAuthError: This API namespace requires private beta access. Visit cloud.satgate.io/docs to request access.

Runnable examples:

• examples/python/issuepayverify.py
• examples/node/issue-pay-verify.mjs

Works with: MCP · OpenAI tools · Anthropic tools · LangChain · CrewAI · Raw HTTP

🎬 See SatGate in Action

  

☁️ Don't want to self-host? Try SatGate Cloud

Managed SaaS — zero setup, multi-tenant isolation, enterprise dashboard. Free Observe tier. No credit card required.

The Problem

AI agents are making API calls autonomously. They spawn sub-agents, call MCP tools, and run overnight while you sleep.

Shortened. The full README is on GitHub.