---
title: "Deploy SafeAgent Execution Guard"
description: "Exactly-once guard for AI agents. Prevents duplicate payments on retry."
category: "AI/ML"
url: https://railway.com/deploy/elegant-serenity
---

# Deploy SafeAgent Execution Guard

Exactly-once guard for AI agents. Prevents duplicate payments on retry.

**[Deploy SafeAgent Execution Guard on Railway](https://railway.com/template/elegant-serenity)**

- **Creator:** azender1's Projects
- **Category:** AI/ML

## Template content

### Postgres https://devicons.railway.app/i/postgresql.svg

- **Image:** ghcr.io/railwayapp-templates/postgres-ssl:18

### SafeAgent

- **Source:** https://github.com/azender1/SafeAgent
- **Start command:** `sh -c "uvicorn safeagent_exec_guard.payment_server:app --host 0.0.0.0 --port ${PORT}" Save and redeploy.`
- **Public domain:** Yes

## Documentation

# Deploy and Host SafeAgent on Railway

SafeAgent is an exactly-once execution guard for AI agents. Prevents duplicate payments, emails, trades, and webhooks when agents retry after crashes or timeouts. PROCEED on first call, SKIP on duplicate. Cited in A2A v0.4 RFC #1920.

## Why Deploy SafeAgent on Railway

Railway gives SafeAgent a persistent Postgres backend and always-on hosting — no serverless cold starts, no lost claims. The exactly-once guarantee requires durable storage that survives process restarts, which Railway's managed Postgres provides out of the box.

## Dependencies for SafeAgent

- Postgres — durable claim storage (included in this template)
- Python 3.12+
- FastAPI + uvicorn

### Deployment Dependencies

- DATABASE_URL — auto-configured from the Postgres service
- SAFEAGENT_PAYMENT_ADDRESS — your Base or Solana wallet for x402 payments (optional)
- MYCELIUM_ENABLED — set to true to enable on-chain audit trails via Mycelium

## About Hosting SafeAgent

SafeAgent runs as a FastAPI service on Railway with Postgres for durable claim storage. Every claim is persisted outside the execution context so crashes don't lose state. The sweeper resets stuck PENDING claims automatically.

## Common Use Cases

- Prevent duplicate Stripe charges when an agent retries after a timeout
- Deduplicate webhooks from Stripe, GitHub, or Twilio
- Guard AI agent tool calls from firing twice on crash-retry
- Prevent duplicate trade executions in algorithmic trading bots
- Exactly-once email sends and API calls

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