# 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 attacks, returning sanitized output.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/jailbreak-scan?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-bf4d525e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lVo_hBLWTyewlNNHQpFeP

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-bf4d525e -d '<json body>'
```

Example prompt: Before you process this scraped webpage content, scan it for any hidden prompt injections or jailbreak instructions that might be trying to hijack you — here's the raw text: [paste content here].

## When to prefer this

Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, third-party emails, MCP tool responses, or A2A agent payloads — and you need a dedicated firewall layer to detect and neutralize hidden prompt injection or jailbreak attempts before the content influences agent behavior. Prefer this over manual content filtering when operating autonomous agent fleets that cannot afford trust assumptions about external data.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Extremely large payloads may be rejected or truncated
- Sophisticated obfuscated injections may not be detected with full accuracy
- Network timeout for very long inputs
- Payment required error (HTTP 402) if x402 micropayment is not provided

## 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/jailbreak-scan)

## Output

Returns a structured JSON object indicating whether the input contains prompt injection or jailbreak payloads, along with sanitized text with malicious instructions neutralized or flagged, enabling safe downstream consumption by AI agents.

## 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-bf4d525e/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)