{"uid":"cap_EJ9qtJXmbVEVCA-8c7Lj9","slug":"x402-audit-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-ce3bbd66","name":"A2A Indirect Prompt-Injection & Jailbreak Firewall","description":"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://x402-audit.agentdiet.dev/v1/prompt-shield)","url":"https://x402-audit.agentdiet.dev/v1/prompt-shield?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["text"],"properties":{"text":{"type":"string","minLength":1,"description":"Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.005","displayCostAsset":"USD","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_6gLBTcE_CDsYwCgxKE_rK","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"x402-audit.agentdiet.dev","brandSlug":"x402-audit-agentdiet-dev-mpp","brandBaseUrl":"https://x402-audit.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized text.","exampleAgentPrompt":"Before you process that scraped webpage content, run it through the prompt-injection firewall to check for any hidden instructions or jailbreak payloads trying to hijack you — here's the raw text: [paste content].","exampleUseCases":[{"title":"Sanitize scraped webpage before agent processing","prompt":"I just scraped this webpage to summarize it, but I want you to check it for hidden prompt injections first before you read it — here's the raw HTML: <html>...attacker content...</html>"},{"title":"Validate MCP tool response for adversarial payloads","prompt":"Before you act on that MCP tool response you just got back, scan it for any hidden jailbreak instructions embedded in it — I don't trust that server."},{"title":"Screen inbound email for prompt injection attacks","prompt":"Can you check this email body for any indirect prompt injection attempts before you parse and summarize it for me? Here's the full text of the email."}],"resultDescription":"Returns a structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized version of the input text with malicious instructions neutralized or flagged.","failureModes":["Empty or missing 'text' parameter returns a validation error","Very large payloads may exceed size limits or timeout","False negatives: sophisticated obfuscated injections may not be detected","False positives: legitimate instructional text may be flagged as injection","HTTP 402 payment required if x402 micropayment not provided","Service unavailability returns 5xx errors"],"whenToPreferThis":"Choose this endpoint when your AI agent is about to process untrusted content from external sources — scraped web pages, emails, third-party MCP/A2A responses, or tool outputs — and you need a dedicated firewall layer to detect and strip hidden prompt injection or jailbreak payloads before they reach the LLM. Prefer this over generic content filters when the specific threat model is adversarial instruction injection targeting AI agents.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:23:50.244Z","isFirstParty":false,"canonicalSlug":"x402-audit-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-cd2da2c7"}