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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from whale-momentum.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 content.
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://whale-momentum.agentdiet.dev/v1/prompt-shield)
Output
Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, allowing the agent to safely process the cleaned content.
Example use cases
Sanitize scraped web content before agent ingestion
“I'm about to feed this scraped HTML from an external site into my agent pipeline — can you run it through the prompt-shield firewall first to strip out any hidden prompt injections before my agent reads it?”
Screen incoming email for adversarial instructions
“Before my agent summarizes this incoming email, scan the full email body for any embedded prompt injection or jailbreak payloads that could hijack the agent's behavior.”
Validate MCP tool response before acting on it
“My agent just got a response back from an external MCP tool — can you run that response text through the prompt-shield scanner to make sure there are no hidden adversarial instructions in it before we act on the result?”
Technical details
Endpoint
GEThttps://whale-momentum.agentdiet.dev/v1/prompt-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to process untrusted third-party content — scraped web pages, external emails, MCP tool responses, or A2A payloads — before acting on them, specifically to defend against indirect prompt injection and jailbreak attacks. Prefer it over generic content filters when you need security screening tuned for LLM-specific attack vectors like hidden instructions in HTML or adversarial tool outputs.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long input text may hit size limits or timeout
- Ambiguous or borderline injection patterns may be missed or over-flagged
- Non-English or heavily encoded content may reduce detection accuracy
- 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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