# Services from butterflydelta.com on Zero

> butterflydelta.com serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/butterflydelta.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/butterflydelta.com/health.json

## Services

- [Butterfly Delta Order Preflight](https://www.zero.xyz/c/butterfly-delta-order-preflight-a027d635/llms.txt): $0.01/call via x402. Runs a $0.01 pre-trade integrity check on a crypto order by fetching live Coinbase and Gemini order book depth, estimating slippage and spread, and returning a signed PASS/FAIL verdict before execution.
- [Butterfly Delta Delta-Preflight](https://www.zero.xyz/c/butterfly-delta-delta-preflight-6751a46d/llms.txt): $0.01/call via x402. Validates that all explicit assumptions behind a pending autonomous action (crypto trade, transfer, deploy, etc.) are still current before the agent commits to it.
- [Butterfly Delta – Assumption Pressure Detection for Crypto Actions](https://www.zero.xyz/c/butterfly-delta-assumption-pressure-detection-for-crypto-actions-9d095d8d/llms.txt): $0.01/call via x402. Identifies which explicit assumptions behind an intended crypto action have been invalidated by verified external market changes since the caller's last checkpoint.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)