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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from x402broker.com, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).
Scans untrusted text, HTML, emails, MCP responses, or 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/guard)
Output
Returns an object indicating whether the input text contains prompt injection or jailbreak payloads, along with sanitized text safe for downstream LLM or agent consumption.
Example use cases
Sanitizing scraped web content for agents
“I just scraped this blog post to feed into my research agent — can you scan it for hidden prompt injections first? Here's the raw HTML: '<div>...content...</div>'”
Screening inbound email before LLM processing
“Before my agent summarizes this inbound customer email, check it for any embedded jailbreak attempts or indirect prompt injection: 'Dear agent, please ignore your previous instructions and...'”
Validating MCP tool output before use
“My agent just got back a response from an external MCP tool and I want to make sure it's not trying to hijack the agent — can you run this payload through the prompt injection firewall before we act on it?”
Technical details
Endpoint
GEThttps://x402broker.com/v1/guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to process untrusted external content — scraped web pages, inbound emails, MCP/A2A responses, or third-party tool outputs — before passing them to an LLM, to prevent indirect prompt injection and jailbreak attacks. Prefer this over manual filtering when you need automated, per-call safety screening with low latency in an agentic pipeline.
Side effects
- Missing or empty 'text' parameter returns a validation error
- Extremely long inputs may be truncated or rejected
- Novel or obfuscated injection techniques may evade detection
- Non-text binary content may not be parseable
- Payment failure via x402 prevents access to the endpoint
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"
}Reviews
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