NeuroDynamic MCP client — 1.0.0

Connect an MCP-compatible agent to NeuroDynamic audio and LLM APIs.

Free by default. Discover services, compare seven voices and inspect prices without a wallet. Purchases are optional and explicitly enabled by the wallet owner.

• Storefront: https://x402.neurodynamic.tech/
• Service catalogue: https://api.neurodynamic.tech/.well-known/ai-services.json
• API schema: https://api.neurodynamic.tech/openapi.json
• Terms: https://neurodynamic.tech/terms
• Privacy: https://neurodynamic.tech/privacy
• Support: support@neurodynamic.tech

What this release supports

Current purchases use native USDC on Base, x402 v2 exact, an EOA wallet. A future merchant network option will not silently change which network this client signs for. SOL-token payments, other chains, smart accounts and automatic bridging are not supported by this client release.

Private cloning is discoverable here; purchase/enrolment stays in the approved-account workflow. This adapter does not enrol voices, bypass consent review or hold cloning bearer credentials. The audio starter includes the separate workflow.

This runs locally on the requesting machine using stdio. It is not a hosted /mcp URL, and it does not open a port. No NeuroDynamic account is needed for catalogue narration, transcription or LLM purchases.

Install

Python 3.10+ on Linux or macOS. Windows users can use WSL. The budget lock uses POSIX file locking.

Download the ZIP and its SHA-256 file from the same official release location. Check the checksum, unpack into a directory you control, then:

python3 -m venv .venv
.venv/bin/pip install -r requirements.lock

The lock records the exact dependencies tested for this release. requirements.txt lists direct dependencies. These are client dependencies, not a disclosure of private infrastructure versions.

Add this to your MCP application's server configuration, replacing the two absolute paths:

{
  "mcpServers": {
    "neurodynamic": {
      "command": "/absolute/path/neurodynamic-mcp/.venv/bin/python",
      "args": ["/absolute/path/neurodynamic-mcp/server.py"]
    }
  }
}

Ask the agent: “List NeuroDynamic services and voices, then get a narration quote. Do not purchase anything.”

The adapter checks the live quote against reviewed merchant, native USDC token, network, amount and signing-domain values. Prices are introductory; if they change, the adapter stops for an update rather than accepting a higher price automatically.

Optional purchases

Use a dedicated low-balance Base wallet. Keep its raw hexadecimal private key in a file owned by the user running the client, with mode 0600; never paste it into an agent prompt or tool call. Wallet keys stay on your requesting machine.

Create a private state directory and, for transcription, a separate input directory. Both should be owned by that user. Audio input files must be mode 0600. Only place files intended for upload in the input directory.

Add owner-controlled env settings to the server configuration:

{
  "NEURODYNAMIC_BUYER_KEY_FILE": "/private/path/buyer.key",
  "NEURODYNAMIC_STATE": "/private/path/neurodynamic-purchases",
  "NEURODYNAMIC_INPUT_DIR": "/private/path/audio-to-upload",
  "NEURODYNAMIC_TOTAL_CAP_ATOMIC": "50000"
}

50000 is 0.05 USDC total, not per call or per day. The cap persists across restarts through the state ledger. This initial client limits its configured cap to at most 1 USDC. State files are the budget history: do not delete or replace them to resolve errors. A host with shell access can alter local files, so this is not a sandbox against a malicious local user or agent.

Each purchase also requires confirm_purchase: true in its tool arguments. The owner must authorise spending; a quote is not permission to spend.

Narration example:

{
  "service": "narration",
  "body": {"input": "Hello from NeuroDynamic.", "voice": "bf_emma"},
  "purchase_id": "my-first-narration",
  "confirm_purchase": true
}

One MP3, up to 1,000 characters: 0.005 USDC. Available voice IDs: Hazel af_heart, Bella af_bella, Emma bf_emma, Alice bf_alice, George bm_george, Michael am_michael, Ben am_fenrir.

Transcription: use transcribe_file with a filename inside your input directory, a new purchase ID, language: "en" and explicit confirmation. Up to 60 seconds/12 MiB, 0.01 USDC. An unpaid quote never reads or uploads audio.

LLM examples use service: "abliterated" (0.020 USDC) or "abliterated-large" (0.035 USDC). The body needs input, optionally max_tokens (16–512), and explicit adult: true, third_party_processing: true, terms_version: "2026-09-11-llm-v1". Only acknowledge these with the user's authority after reading https://api.neurodynamic.tech/llm. Input is limited to 2,000 UTF-8 bytes. Adults 18+, lawful use; generated content can be wrong.

Recovery and privacy

The adapter reserves budget and saves the signed proof before sending a paid request. It saves returned output locally with mode 0600 and records the receipt. It does not log prompts or private keys.

• Repeating the same purchase ID returns its saved state; it does not sign or submit another payment.
• The same ID with different input is rejected.
• Failed or uncertain purchases keep their budget reservation. They are not automatically refunded or retried.
• Use payment_status after uncertainty. Contact support with the request ID or transaction hash if needed. Do not send private keys, signed proofs or your state database to support.
• LLM outputs are not retained by NeuroDynamic after processing. A lost LLM response cannot be recovered by paying again safely; payment status is available without another charge.
• Transcription/narration recovery follows each API guide. This initial adapter does not automatically resend an uncertain paid request; preserve the state and original input for support-assisted recovery.

Your local state directory contains signed payment proofs, purchase metadata and returned files. Protect it like wallet material. Requests contain your chosen text/audio. Merchant operational metadata and service-specific retention are explained in the API guides. LLM requests go to third-party providers with separate retention policies; local server content-retention statements do not cover those providers or your client files.

Verification

.venv/bin/python -m unittest discover -s tests -v
.venv/bin/python tests/stdio_smoke.py

Unit tests use synthetic HTTP responses and an unfunded temporary signing key. The stdio smoke test performs only free live discovery/quotes and confirms purchases are disabled.

Release validation also completed three separately authorised operator purchases (narration, transcription and LLM), total 0.035 USDC, followed by no-charge duplicate and status checks. These are test activity, not customer sales.