# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from polymarket-odds.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 injections and jailbreak attempts, returning sanitized text.

## Facts

- Endpoint: POST https://polymarket-odds.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: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-2bba5462
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q00IrGr2r-NKZDV0qdpEE

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 polymarket-odds-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-2bba5462 -d '<json body>'
```

Example prompt: Before you summarize this scraped web page for me, run it through the RAG poison shield first — scan it for any hidden prompt injections or jailbreak payloads and give me back the sanitized version.

## When to prefer this

Use this endpoint whenever an AI agent must process text from untrusted external sources — scraped web pages, emails, third-party API responses, MCP tool outputs, or user-submitted content — before passing that text into an LLM context window. It is particularly valuable in multi-agent (A2A) pipelines where one agent's output becomes another agent's input, creating indirect injection attack surfaces. Prefer this over manual regex filtering when you need a purpose-built, AI-aware firewall that understands prompt injection semantics.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may hit size limits or timeout
- Obfuscated or novel injection techniques may evade detection
- Non-text binary content is not supported
- Payment failure (402) if x402 micropayment is not correctly attached

## 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://polymarket-odds.agentdiet.dev/v1/rag-poison-shield)

## Output

Returns a sanitized version of the input text with hidden prompt injections and jailbreak payloads detected and removed, along with threat detection metadata indicating whether malicious content was found.

## 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/polymarket-odds-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-2bba5462/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)