# Agent Preflight

> Agent Preflight lets an agent check a planned tool call before spending on it. It returns allow, block, reuse, defer, or advise. It never executes the destination tool.

Version: v0.3
Paid endpoint: POST https://api.agent-preflight.com/v0.2/preflight/tool-call
Price: $0.002 USDC per paid POST
Payment: x402 v2 on Base mainnet (eip155:8453); unpaid POSTs return 402 with PAYMENT-REQUIRED
Canonical site: https://agent-preflight.com
Canonical API: https://api.agent-preflight.com

## Start here
- https://agent-preflight.com/index.md: one-page Markdown summary (same as GET / with Accept: text/markdown)
- https://agent-preflight.com/.well-known/agent-skills/agent-preflight/SKILL.md: Agent Skill with call steps
- https://api.agent-preflight.com/openapi.json: OpenAPI 3.1

## Endpoints
- GET https://api.agent-preflight.com/health
- GET https://api.agent-preflight.com/openapi.json
- POST https://api.agent-preflight.com/v0.2/preflight/tool-call ($0.002 USDC, x402)
- POST https://api.agent-preflight.com/check-request (unpaid)
- MCP https://api.agent-preflight.com/mcp (unpaid)

## Docs
- https://agent-preflight.com/docs (HTML; Markdown at https://agent-preflight.com/docs/index.md)
- https://agent-preflight.com/llms-full.txt
- https://agent-preflight.com/.well-known/agent-skills/index.json
- https://agent-preflight.com/.well-known/api-catalog

## Notes
- Agent Preflight never executes the destination tool; it returns a decision only.
- Analytics use hashed run/step IDs; raw IDs and bodies are not stored in Analytics Engine points.
- No safety or savings guarantees.