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x402broker Injection Guard — A2A Prompt-Injection & Jailbreak Firewall
x402
x402broker Injection Guard — A2A 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 2026-10-21).
Scans untrusted text (web pages, emails, MCP responses, A2A payloads) for hidden prompt injections and jailbreak attempts, returning sanitized output safe for agent consumption.
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/injection-guard)
Output
Returns sanitized text stripped of detected prompt injection attempts and jailbreak payloads, along with a threat assessment indicating whether malicious content was found and what was removed.
Example use cases
Sanitize scraped web content for agent pipeline
“I'm about to feed this scraped HTML from an external site into my research agent — can you scan it for any hidden prompt injection attacks first and return the clean text?”
Screen incoming emails for jailbreak payloads
“Check this email body for any embedded jailbreak instructions or indirect prompt injections before my email-processing agent acts on it.”
Validate MCP tool response before agent use
“My agent just got a response back from a third-party MCP tool — can you run it through the injection guard to make sure there are no adversarial instructions hidden in there before we continue?”
Technical details
Endpoint
GEThttps://x402broker.com/v1/injection-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to safely consume untrusted external content — web scrapes, third-party API responses, emails, or A2A payloads — before acting on them. It is specifically designed for the agent-security use case of indirect prompt injection defense, making it preferable to generic content filters when protecting LLM pipelines from adversarial manipulation.
Side effects
- Empty or missing 'text' query parameter returns an error
- Extremely large payloads may be truncated or rejected
- Obfuscated or encoded injections may evade detection
- Non-text binary content cannot be scanned
- Service may return false positives on legitimate instructional content that resembles injection syntax
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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