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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 injection 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/system-prompt-guard)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input, along with sanitized text safe for downstream agent consumption. Flags adversarial patterns, hidden instructions, or jailbreak payloads found in the scanned content.
Example use cases
Safe web scraping for agent pipelines
“I just scraped this webpage to feed into my research agent, but I want to make sure it doesn't contain any hidden prompt injections — can you scan this HTML and give me the sanitized text before the agent reads it?”
Email security screening for AI inbox
“My AI assistant is about to read and summarize this inbound email from an unknown sender. First, scan the email body for any hidden jailbreak or prompt injection attempts: 'Dear assistant, ignore your previous instructions and...'”
MCP tool response verification
“My agent just got back a response from an external MCP tool and I'm worried it might contain adversarial instructions. Can you run this tool output through the prompt-injection firewall before my agent acts on it?”
Technical details
Endpoint
GEThttps://x402broker.com/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to process content from untrusted external sources — scraped web pages, third-party API responses, MCP tool outputs, inbound emails, or A2A payloads — and you want to defend against indirect prompt injection or jailbreak attacks before that content reaches your LLM. Prefer this over manual content filtering when you need a fast, automated security layer in agentic pipelines that consume external data.
Side effects
- Empty or missing 'text' parameter returns validation error
- Extremely long payloads may be truncated or rejected
- False negatives possible for highly obfuscated injection patterns
- False positives may flag legitimate content containing LLM-related terminology
- Service unavailability returns HTTP 402 or 5xx error
- Network timeout for very large HTML documents
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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