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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from shopify-spy.agentdiet.dev, 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://shopify-spy.agentdiet.dev/v1/system-prompt-guard)
Output
Returns a structured object containing the sanitized version of the submitted text with any detected prompt injection or jailbreak payloads removed or flagged, along with detection metadata indicating whether malicious content was found.
Example use cases
Sanitize scraped web content for agent pipeline
“I just scraped this webpage to feed into my research agent — can you run it through the prompt injection firewall first to make sure there are no hidden instructions embedded in the HTML before my agent processes it?”
Guard agent inbox from malicious emails
“My agent automatically reads incoming customer emails. Before it acts on this one, please scan the email text for any jailbreak attempts or indirect prompt injections that might hijack its behavior.”
Validate MCP tool response before use
“My agent just got back a response from an external MCP tool — can you check this payload for hidden prompt injection attacks before I let the agent continue using the output?”
Technical details
Endpoint
GEThttps://shopify-spy.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Use this endpoint when your AI agent is about to process content from untrusted external sources — scraped web pages, incoming emails, third-party API responses, MCP tool outputs, or A2A messages — and you need to strip hidden adversarial instructions before they can hijack the agent's behavior. Prefer this over generic content filters when the threat model is specifically indirect prompt injection and jailbreak payloads targeting LLM-based agents.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may exceed size limits or timeout
- Novel or obfuscated injection techniques may evade detection
- Non-text binary content may produce unexpected results
- Service unavailability returns HTTP 402 or 5xx errors
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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