# 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 injections and jailbreak attempts, returning sanitized output.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/injection-firewall?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-9c4c1219
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k92_mYKnZ5U2gHxs8FbE_

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-9c4c1219 -d '<json body>'
```

Example prompt: Before you summarize that webpage I scraped, run the raw HTML through the prompt-injection firewall to check for any hidden jailbreak instructions or adversarial prompts embedded in the content.

## When to prefer this

Choose this endpoint when your AI agent is consuming content from untrusted external sources — web pages, emails, user-submitted inputs, third-party tool responses, or A2A payloads — and you need to ensure those inputs do not contain hidden instructions designed to manipulate the agent's behavior. Prefer it over generic content filters when your threat model specifically includes indirect prompt injection and jailbreak attacks targeting LLM-based pipelines.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Very large payloads may exceed size limits and return a 413 error
- Ambiguous or borderline adversarial content may not be detected with full confidence
- Non-text binary data (e.g., raw images) cannot be scanned and will error
- Payment not attached or insufficient funds returns HTTP 402

## 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/injection-firewall)

## Output

Returns an object indicating whether the input text contained prompt injection or jailbreak payloads, along with a sanitized version of the text with malicious instructions removed or flagged.

## 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-9c4c1219/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)