# 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 output

## Facts

- Endpoint: POST https://polymarket-odds.agentdiet.dev/v1/guard?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-c9312b61
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DHIIE2o-7f6QPBSbCw-Zt

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-c9312b61 -d '<json body>'
```

Example prompt: Before you process this webpage content I scraped, can you scan it for any hidden prompt injections or jailbreak instructions and give me the sanitized version that's safe to use?

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web scrapes, emails, third-party API responses, MCP tool outputs, or A2A messages — and you need to verify and sanitize that content before passing it to an LLM or downstream agent to prevent indirect prompt injection and jailbreak attacks. Prefer this over manual filtering when the content is arbitrary HTML or free text with unknown structure.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Extremely large payloads may time out or be rejected
- Ambiguous or borderline injection patterns may not be flagged (false negatives)
- Legitimate content resembling injection syntax may be incorrectly sanitized (false positives)
- Payment failure via x402 returns a 402 status before scanning occurs

## 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/guard)

## Output

Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads identified and neutralized, allowing the agent to safely process the cleaned content downstream.

## 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-c9312b61/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)