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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from prompt-guard.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-injection and jailbreak attacks, 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://prompt-guard.agentdiet.dev/paid)
Output
Returns a JSON object containing the sanitized version of the input text with hidden prompt injections and jailbreak payloads removed or flagged, enabling safe downstream use in AI agent pipelines.
Example use cases
Sanitizing scraped web content for agent pipeline
“I just scraped this HTML from an untrusted third-party site before feeding it to my summarization agent — can you scan it for any hidden prompt injection or jailbreak instructions and return the clean text?”
Screening inbound email before AI processing
“I have an inbound email body I'm about to hand off to my AI email assistant — first check it for any embedded prompt hijacking attempts and give me the sanitized version.”
Validating MCP tool response before chaining
“My agent just got back a response from an external MCP tool and I need to verify it doesn't contain any adversarial instructions before passing it downstream — can you run it through your prompt injection firewall?”
Technical details
Endpoint
POSThttps://prompt-guard.agentdiet.dev/paid?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web pages, emails, third-party APIs, MCP tool responses, or A2A payloads — and you need to sanitize that content before it reaches your core LLM. Especially valuable in agentic workflows where indirect prompt injection is a real attack vector and you need a dedicated firewall step rather than relying on the LLM's own resistance.
Side effects
- Empty or missing 'text' field returns a 422 validation error
- Extremely large payloads may time out or be rejected
- Payment failure via x402 returns HTTP 402 with payment instructions
- Obfuscated or novel injection techniques may evade detection
- 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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