# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from onchain-risk.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://onchain-risk.agentdiet.dev/v1/workflows/rag-context-sanitizer?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f47b57ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XTxRWfrKtWrgQNmrKSHO9

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 onchain-risk-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f47b57ed -d '<json body>'
```

Example prompt: Before you feed that scraped webpage content into our RAG pipeline, run it through the prompt injection firewall and give me the sanitized version — I want to make sure there are no hidden instructions trying to hijack your behavior.

## When to prefer this

Choose this endpoint when your agent pipeline ingests untrusted external content — scraped web pages, emails, MCP tool responses, A2A messages, or RAG context — and you need to detect and strip hidden prompt injections or jailbreak instructions before they reach your LLM. It is especially valuable in autonomous agent workflows where adversarial third-party content could hijack agent behavior.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Payloads that are extremely long may be truncated or rejected
- Ambiguous injection patterns may produce false positives, over-sanitizing legitimate content
- Service may return 402 Payment Required if USDC payment is not attached or insufficient
- Network timeouts if the scanning model is under load

## 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://onchain-risk.agentdiet.dev/v1/workflows/rag-context-sanitizer)

## Output

Returns a sanitized version of the input text with hidden prompt injection and jailbreak payloads removed or neutralized, along with detection metadata 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/onchain-risk-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f47b57ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)