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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from domain-osint.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-23).
Scans untrusted text, HTML, 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://domain-osint.agentdiet.dev/v1/llm-guard)
Output
Returns a structured JSON object indicating whether the input text contained prompt injection or jailbreak payloads, along with a sanitized version of the text safe for downstream LLM consumption.
Example use cases
Sanitize scraped web content before LLM processing
“I'm about to feed this scraped article HTML to my summarization agent — can you scan it through the prompt injection firewall first to make sure there are no hidden adversarial instructions embedded in the page?”
Screen incoming emails for prompt injection attacks
“This email was forwarded by an external contact and my agent is about to read it — please run the full email body through the LLM Guard to check if it contains any jailbreak or prompt injection attempts before my agent processes it.”
Guard agent pipeline from malicious MCP tool responses
“My agent just received a response from an external MCP tool and I'm worried it might contain embedded prompt injection payloads — scan that tool output for hidden instructions before we pass it along to the next step in the pipeline.”
Technical details
Endpoint
POSThttps://domain-osint.agentdiet.dev/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — scraped HTML, emails, MCP tool responses, or A2A messages — that could contain adversarial prompt injection or jailbreak instructions. It is specifically designed for agent-to-agent and LLM security contexts, making it preferable over generic content moderation APIs when the threat model involves hidden instructions targeting language model behavior rather than user-facing harmful content.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Payload exceeding size limits may be rejected or truncated
- Payment failure (402) if x402 micropayment is not properly attached
- Transient upstream errors may return 5xx responses requiring retry with Idempotency-Key
- Extremely obfuscated injections may evade detection (false negatives)
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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