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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from hn-pulse.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 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://hn-pulse.agentdiet.dev/v1/guard)
Output
Returns a JSON object indicating whether prompt injection or jailbreak content was detected, along with sanitized text safe for downstream agent consumption.
Example use cases
Guarding agent from malicious scraped pages
“I'm building an agent that reads web pages and summarizes them — can you scan this raw HTML from that untrusted site for any hidden prompt injections or jailbreak attempts before passing it along?”
Screening inbound emails for AI hijacking
“Before my email agent processes this incoming message, run it through the injection firewall — I want to make sure there's nothing in the email body trying to override my agent's instructions.”
Validating MCP tool output before acting
“My agent just got a response back from an external MCP tool — can you check that response text for any embedded adversarial instructions or jailbreak payloads before I let the agent act on it?”
Technical details
Endpoint
POSThttps://hn-pulse.agentdiet.dev/v1/guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, inbound emails, third-party tool responses, or A2A payloads — and you need a dedicated security layer to detect and neutralize hidden prompt injections or jailbreak attempts before the content reaches your LLM. Prefer it over generic content filters when the specific threat model is adversarial AI manipulation rather than spam or toxicity.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may hit size limits or timeout
- Sophisticated obfuscated injections may evade detection (false negatives)
- Service unavailability returns 5xx; idempotency key allows safe retry
- Payment not settled returns HTTP 402 requiring x402 micropayment flow
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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