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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/prompt-injection-shield)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input, along with sanitized text with malicious instructions removed or flagged, allowing downstream agents to safely process the cleaned content.
Example use cases
Sanitizing scraped web content for agents
“I'm building an agent that reads competitor websites — before passing the raw HTML to my LLM, check this page content for any hidden prompt injections or adversarial instructions embedded in it.”
Screening emails before AI summarization
“My agent automatically summarizes incoming emails, but I'm worried about prompt injection attacks — can you scan this email body for hidden jailbreak payloads before the summarizer processes it?”
Validating MCP tool responses in a pipeline
“My coding agent just got back a response from an MCP tool that called an external API — scan that tool output for any embedded prompt injections or jailbreak attempts before I let the agent act on it.”
Technical details
Endpoint
GEThttps://x402broker.com/v1/prompt-injection-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — scraped web pages, user emails, third-party API or MCP tool responses, or A2A messages — before passing that content to an LLM. It is especially valuable in autonomous agent loops where indirect prompt injection from adversarial web content poses a real risk. Prefer this over generic text filtering when you need LLM-specific jailbreak and prompt injection detection rather than general content moderation.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long payloads may time out or be truncated
- Obfuscated or encoded injections (e.g., base64, Unicode tricks) may evade detection
- Response schema is generic object — caller must inspect structure for detection flags
- Payment failure (402) blocks the request if x402 USDC balance is insufficient
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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