---
title: "Pre-transaction guard: policy evaluation + signed receipt (E1)"
method: POST
path: "/api/v1/evm/guard"
tags: ["evm"]
---

# Pre-transaction guard: policy evaluation + signed receipt (E1)

`POST /api/v1/evm/guard`

## Request body

- object

## Response `200`

Guard decision and signed receipt

## Other responses

- `400` — Validation error
- `503` — Receipt signing not configured

## Changes

- **2026-04-28** `33dd194c5572` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/humbleaf/apis/agentchain-prior-api/changes/api/v1/evm/guard/post.md)

---

[API](https://skmtc.dev/humbleaf/apis/agentchain-prior-api.md) · [All operations](https://skmtc.dev/humbleaf/apis/agentchain-prior-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/humbleaf/agentchain-prior-api/revisions/33dd194c5572/schema)