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broker-llm-guard: A2A Indirect Prompt-Injection & Jailbreak Firewall
x402
broker-llm-guard: A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.005/call, status unknown (last checked 2026-10-20).
Scans untrusted text (web pages, emails, MCP responses, A2A payloads) for hidden prompt injections and jailbreak attempts, returning sanitized output.
Price / call$0.005
Success—
StatusUnknown
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://x402broker.com/v1/llm-guard)
Output
Returns a threat assessment indicating whether the input text contains prompt injection or jailbreak content, along with a sanitized version of the text with malicious instructions removed or flagged, and likely a confidence score or classification of the detected threat type.
Example use cases
Sanitizing scraped web content for agents
“I'm about to feed this crawled webpage into my AI pipeline — can you scan it for hidden prompt injections first and give me the sanitized version? Here's the raw text from the page.”
Checking MCP responses for adversarial payloads
“My agent just got a response from an external MCP tool and I want to make sure it's not trying to hijack my LLM's instructions — can you run it through the prompt-injection firewall before I let my agent act on it?”
Filtering inbound emails before LLM summarization
“Before my AI summarizes these customer emails, scan this one for any indirect prompt injection attempts — I want to make sure no one is sneaking in instructions to manipulate the model.”
Technical details
Endpoint
GEThttps://x402broker.com/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is consuming content from untrusted external sources — scraped web pages, inbound emails, third-party API responses, MCP tool outputs, or A2A messages — and you need to detect and neutralize hidden prompt injection or jailbreak attempts before that content reaches your LLM. It is especially valuable in agentic pipelines where indirect prompt injection is a primary attack vector.
Side effects
- Missing required 'text' query parameter returns an error response
- Empty or very short input may produce inconclusive scan results
- Highly obfuscated or novel injection techniques may evade detection
- Rate limiting or payment failures return 402 or 429 status codes
- Extremely long text payloads may be truncated or rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| textrequired | string | Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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