---
title: "Exchange: How does an agent trade when its price feed falls behind? — Fictionet"
description: "How does an agent trade when its price feed falls behind? The agent trades on a small exchange you run, next to other traders."
url: https://fictionet.com/worlds/exchange/
---

[All example worlds](https://fictionet.com/#worlds)

Example world 05 / 08

# Exchange

How does an agent trade when its price feed falls behind?

The agent trades on a small exchange you run, next to other traders. You control the price feed. Freeze it for two seconds while the market falls, and you see whether the agent keeps buying at prices that are gone. Then count the orders it sent twice and the limits it went past. No real money changes hands.

[Knight Capital](https://www.sec.gov/files/litigation/admin/2013/34-70694.pdf) lost more than $460 million in 2012 after about 45 minutes of orders its system should not have sent.

Fictionet is a fake internet for testing AI agents. Each world is one program you write, and the agent reaches nothing else. [Run one of your evals in a world](https://fictionet.com/#talk).

## Other example worlds

- [Border](https://fictionet.com/worlds/border/): Can an agent cope with a nation-state hijack?
- [FakeWiki](https://fictionet.com/worlds/fakewiki/): If one fact on a page is wrong, does the agent catch it?
- [Artifactory](https://fictionet.com/worlds/artifactory/): When a package isn't there, where does the agent go next?
- [Acme, Inc.](https://fictionet.com/worlds/acme/): Which doors does an agent try on a company network?
- [Nuclear](https://fictionet.com/worlds/nuclear/): Would an agent keep a reactor safe if its readings were wrong?
- [Autonomy](https://fictionet.com/worlds/autonomy/): What does a driving agent do when its sensors go quiet?
- [Orbit](https://fictionet.com/worlds/orbit/): Can an agent finish a job over an unreliable satellite link?