Transcribe an audio file from a URL using faster-whisper with auto language detection. Price: $0.05 USDC per transcription (paid mode) | Free test: returns fixture data. Supports: MP3, WAV, M4A, FLAC, OGG, and most audio formats. Limits: 25MB file size, 10-minute duration. Payment is charged on d...
AI agents call x402_transcribe_audio to retrieve information from x402 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The x402_transcribe_audio tool performs audio-to-text conversion, which is fundamentally a read/query operation that retrieves and transforms data without side effects. The tool does not create, modify, delete, or execute arbitrary code. While the server infrastructure involves automatic blockchain payments, the tool itself only reads an audio file and outputs its transcription.
From the tool's definition Tool description states it 'transcribe[s] an audio file from a URL' and 'Returns: transcript text, detected language, language confidence, duration, and segment[s]'.
Attacks that exploit this kind of access
Transcribe an audio file from a URL using faster-whisper with auto language detection. Price: $0.05 USDC per transcription (paid mode) | Free test: returns fixture data. Supports: MP3, WAV, M4A, FLAC, OGG, and most audio formats. Limits: 25MB file size, 10-minute duration. Payment is charged on download; duration refusals are still charged. Note: transcription can take 30–120 seconds for longer files (CPU-based, requests queue serially). Without X402_PRIVATE_KEY, only the free test endpoint is available. Returns: transcript text, detected language, language confidence, duration, and segment or word timestamps. It is categorised as a Read tool in the x402 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the x402 MCP Server MCP server in PolicyLayer and add a rule for x402_transcribe_audio: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches x402 MCP Server. Nothing to install.
x402_transcribe_audio is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the x402_transcribe_audio rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for x402_transcribe_audio. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
x402_transcribe_audio is provided by the x402 MCP Server MCP server (jameswilliamwisdom/x402-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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