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UnlimitedTTS MCP server

by unlimitedtts.com·com.unlimitedtts/tts·v0.1.0
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Quote-first, non-custodial x402 text-to-speech with spend policy, MP3 artifacts, and receipts.

A88/100grade A
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Safety scan
A88/100

full report

Adoption
Growing

0 stars30 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

UnlimitedTTS tools (3, 2 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • tts_list_voices

    Return the live voice catalog, current character price, and synthesis limits. No payment is made.

  • tts_quotewrite action

    Send the text to the pinned UnlimitedTTS x402 endpoint to obtain and policy-check a live USDC quote. This makes no payment.

  • tts_synthesizewrite action

    Submit the exact quoted request with an x402 PaymentPayload, save the MP3 under the configured output root, and return a sanitized settlement receipt. Payment is irreversible and this tool is not replay-safe.

Public scan report

scanner v0.1.10 · 2026-11-01 · same rubric, same numbers if you re-run it

no findings
  • Code scan7 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 3 days ago15/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year5/10
Overall 88/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How UnlimitedTTS compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
88/100
higher than 75% of 48,255 servers
Tools
3
the typical server has 7
Tools that change things
67%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
30
more than 18% of 12,191 servers with a package

What its tools let an agent do: 1 read · 2 change

Install UnlimitedTTS in Claude Code, Cursor or VS Code

Runs npx -y @unlimitedtts/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add tts -- npx -y @unlimitedtts/mcp
Add to Cursor

What the publisher says

From the UnlimitedTTS repository's README, as published. We do not edit it. Read it on GitHub

UnlimitedTTS for Agents

Non-custodial, quote-first text-to-speech for AI agents:

  • @unlimitedtts/core validates live x402 challenges, enforces spend policy, persists sanitized receipts, and writes private MP3 artifacts.
  • @unlimitedtts/mcp exposes ttslistvoices, ttsquote, and irreversible ttssynthesize tools over stdio.
  • @unlimitedtts/openclaw bundles the MCP server and the unlimitedtts agent skill.
  • skills/unlimitedtts supports MCP-guided and direct wallet-aware HTTP workflows.

The implemented v1 path is external-signature mode. A separate wallet tool creates the x402 v2 PAYMENT-SIGNATURE; this code never accepts a seed phrase or private key.

Install and build

Node.js 20 or newer and pnpm are required.

pnpm install --frozen-lockfile
pnpm check

Run the local server from this checkout:

pnpm --filter @unlimitedtts/mcp build
node packages/mcp/dist/cli.js

Generic MCP configuration after npm publication:

{
  "mcpServers": {
    "unlimitedtts": {
      "command": "npx",
      "args": ["-y", "@unlimitedtts/mcp@0.1.0"],
      "env": {
        "UNLIMITEDTTS_MAX_USDC_PER_CALL": "0.10",
        "UNLIMITEDTTS_ROLLING_24H_USDC": "1.00",
        "UNLIMITEDTTS_OUTPUT_DIRECTORY": "/absolute/approved/output"
      }
    }
  }
}

OpenClaw local development:

pnpm --filter @unlimitedtts/openclaw build
openclaw plugins install -l ./packages/openclaw
openclaw plugins enable unlimitedtts
openclaw gateway restart
openclaw plugins inspect unlimitedtts --runtime --json
openclaw plugins doctor

Payment flow

  1. ttslistvoices retrieves /docs and /tts/voices and caches the result for five minutes.
  2. tts_quote sends the exact synthesis body to /x402/tts without payment, validates the returned PAYMENT-REQUIRED, enforces local policy, reserves rolling budget, and returns a short-lived HMAC token.
  3. A wallet signs only the returned selectedRequirement.
  4. tts_synthesize verifies the token, unchanged body hash, complete x402 v2 accepted entry, exact-EVM payee and value, then sends one paid retry.
  5. A successful call requires both audio/mpeg and PAYMENT-RESPONSE. It commits the budget, writes a sanitized receipt, atomically stores the MP3 with mode 0600, and returns structured metadata plus MCP audio/resource content.

PAYMENTOUTCOMEUNKNOWN permanently quarantines that quote in the local ledger. The server never automatically submits or authorizes a second payment.

Configuration

Payee rotation must be released through trusted configuration. The server never learns an allowed payee from an untrusted challenge.

Production remains the default and is pinned to Base mainnet. For staging validation, set UNLIMITEDTTS_ENVIRONMENT=staging; this selects https://staging-api.unlimitedtts.com, Base Sepolia (eip155:84532), and staging USDC. The core rejects the staging origin, network, or asset when the environment is not explicitly staging.

Scope

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

UnlimitedTTS: common questions

Is UnlimitedTTS MCP server safe?
Yes, by our scan: it is graded A (88/100). Read the UnlimitedTTS safety report
How do I install UnlimitedTTS?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does UnlimitedTTS need an API key?
No secret keys are declared. It reads 4 settings from the environment.
Is UnlimitedTTS maintained?
The last commit was 6 days ago (2026-10-29). The latest release is v0.1.0.
What can I use instead of UnlimitedTTS?
Servers from other publishers that do the same job: Nautilus Compass Memory MCP server.
How does UnlimitedTTS compare with other MCP servers?
safety score 88/100 (higher than 75% of 48,255 servers); tools 3 (the typical server has 7); tools that change things 67% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to UnlimitedTTS

Same job from other publishers: the closest match first, then the best rated.

  • Nautilus Compass Memory
    Local-first long-term memory for AI agents, with byte-recomputable signed verification receipts.
    B