# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from serp-extract.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-23).

Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injection and jailbreak payloads, returning sanitized content.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/rag-poison-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f05f4794
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XvJOIKDHh6QL_vwcyHhoK

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

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability serp-extract-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f05f4794 -d '<json body>'
```

Example prompt: Before you process that scraped web page, run it through the prompt-injection firewall to check for any hidden jailbreak or prompt injection payloads — here's the raw HTML: [paste content].

## When to prefer this

Use this endpoint when your AI agent is about to process content from untrusted external sources — web scrapes, emails, third-party API responses, MCP tool outputs, or A2A payloads — and you need to verify it is free from hidden prompt injection or jailbreak attempts before letting it influence agent behavior. Prefer this over generic text filters when operating in agentic pipelines where indirect prompt injection is a specific threat vector.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Payment not provided or insufficient returns HTTP 402 requiring x402 USDC payment
- Extremely large payloads may exceed size limits and return a 413 error
- Ambiguous or novel injection techniques may not be detected, producing false negatives
- Network timeouts for very long documents

## How this service works

Scans untrusted web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and returns sanitized text. (Live x402 v2, IETF MPP & MCP endpoint at https://serp-extract.agentdiet.dev/v1/rag-poison-shield)

## Output

Returns a JSON object containing the scan result for the submitted text, including whether prompt injection or jailbreak payloads were detected and a sanitized version of the input text safe for agent consumption.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "minLength": 1,
   "description": "Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/serp-extract-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f05f4794/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)