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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 2026-10-23).
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://shopify-spy.agentdiet.dev/v1/prompt-guard)
Output
Returns a sanitized version of the input text with hidden prompt injection and jailbreak payloads detected and removed or flagged, along with detection metadata indicating whether any malicious content was found.
Example use cases
Sanitize scraped webpage before processing
“I just scraped this e-commerce product page and I want to feed its content to my analysis agent — but first, scan it for any hidden prompt injection instructions embedded in the HTML and return the clean version.”
Screen inbound email for embedded instructions
“Can you check this email body for hidden prompt injection or jailbreak payloads before my agent reads it? I don't trust the sender and want to make sure there are no embedded override instructions.”
Validate MCP tool response before agent consumption
“My agent just got back a response from an external MCP tool — please scan it for any indirect prompt injection attempts or hidden instructions before I pass it along to the next step in the pipeline.”
Technical details
Endpoint
POSThttps://shopify-spy.agentdiet.dev/v1/prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests text from untrusted external sources — scraped web pages, user-submitted content, third-party API responses, emails, or MCP/A2A messages — and you need to sanitize them before passing to an LLM. It is specifically designed for A2A and agent-to-agent security contexts, making it more targeted than a generic content moderation API.
Side effects
- Empty or whitespace-only text input returns a validation error
- Extremely large payloads may exceed processing limits or time out
- Obfuscated or novel injection techniques may evade detection
- Payment required (HTTP 402) if x402 micropayment header is missing or invalid
- Non-UTF-8 encoded content may cause parsing 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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