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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from onchain-risk.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 text.
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://onchain-risk.agentdiet.dev/v1/prompt-shield)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized text stripped of malicious instructions, enabling agents to safely process the cleaned output.
Example use cases
Sanitizing scraped web content for agents
“I'm about to feed this webpage's text into my reasoning pipeline — can you first scan it for any hidden prompt injection attacks or adversarial instructions buried in the HTML before I use it?”
Checking MCP tool responses for hijacking
“Before my agent acts on this MCP tool response, please run it through the prompt-injection firewall to make sure no malicious instructions are embedded in the payload.”
Screening inbound emails for jailbreak attempts
“Can you scan this email body for any hidden prompt injections or jailbreak payloads that might try to hijack my AI assistant if I let it read the message?”
Technical details
Endpoint
GEThttps://onchain-risk.agentdiet.dev/v1/prompt-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is about to consume externally sourced content — web pages, emails, MCP responses, or A2A payloads — that could contain adversarial hidden instructions designed to hijack the agent's behavior. It is especially valuable in agentic pipelines where the LLM processes untrusted third-party data before taking actions. Prefer this over generic content filters when you need specific detection of prompt injection and jailbreak patterns rather than just toxicity or spam filtering.
Side effects
- Missing required 'text' parameter returns a validation error
- Empty string input rejected due to minLength:1 constraint
- Very large payloads may timeout or exceed size limits
- Payment failure (HTTP 402) if USDC micropayment is not provided
- False negatives possible for highly obfuscated injections not yet in detection rules
- Non-text binary content may produce unreliable scan results
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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