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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from serp-extract.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-23).
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://serp-extract.agentdiet.dev/v1/mcp-security)
Output
Returns a JSON object containing the sanitized version of the submitted text with hidden prompt injection payloads removed or flagged, along with detection signals indicating whether adversarial content was found.
Example use cases
Securing agent web browsing pipeline
“I'm building an agent that reads web pages and summarizes them — can you scan this raw HTML I just fetched before passing it to the summarizer? I need to make sure there are no hidden instructions trying to hijack the agent.”
Validating MCP tool responses
“My agent just got back a response from a third-party MCP server tool call. Can you run it through the prompt-injection firewall before I let my agent act on it? Here's the raw payload.”
Screening inbound emails for LLM pipelines
“We have an AI agent that reads customer support emails and drafts replies — can you scan this email body for any prompt injection attempts or jailbreak text before the agent processes it?”
Technical details
Endpoint
POSThttps://serp-extract.agentdiet.dev/v1/mcp-security?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, MCP/A2A tool responses, or user-submitted text — and you need a dedicated firewall layer to detect and strip hidden prompt injection or jailbreak payloads before passing content to your LLM. Particularly valuable in autonomous agent workflows where indirect prompt injection is a real attack vector.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may exceed token or size limits and return an error
- Subtle obfuscated injections using Unicode tricks or encoding may evade detection
- Service unavailability or payment failure (x402) returns a 402 or 5xx response
- Highly novel jailbreak techniques not in training distribution may be missed
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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