# 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 attempts, returning sanitized output.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/mcp-security?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-8d0b4c5f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6XrCzy5qC1Hw0I1sbTX2c

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-8d0b4c5f -d '<json body>'
```

Example prompt: Before we process this scraped webpage content in our pipeline, scan it for hidden prompt injections or jailbreak payloads and give me the sanitized version: [paste untrusted HTML or text here].

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, MCP/A2A tool responses, or user-submitted text — and you need a dedicated firewall layer to detect and strip hidden prompt injection or jailbreak payloads before passing content to your LLM. Particularly valuable in autonomous agent workflows where indirect prompt injection is a real attack vector.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may exceed token or size limits and return an error
- Subtle obfuscated injections using Unicode tricks or encoding may evade detection
- Service unavailability or payment failure (x402) returns a 402 or 5xx response
- Highly novel jailbreak techniques not in training distribution may be missed

## 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/mcp-security)

## Output

Returns a JSON object containing the sanitized version of the submitted text with hidden prompt injection payloads removed or flagged, along with detection signals indicating whether adversarial 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/serp-extract-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8d0b4c5f/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)