PacketExchange

Connect AI agents and MCP clients to the PacketExchange voice and SMS marketplace.

PacketExchange runs a hosted Model Context Protocol server. Once your client is connected, an agent can search the marketplace, compare routes, run a phone verification, send an SMS, place a call and follow it, and check the account balance, by calling tools by name.

This repository holds the documentation and ready-to-use client configurations. There is nothing to build or host: the server runs at PacketExchange.

Server

Install

Pick your client and copy its configuration:

Clients that connect to remote servers directly need only the URL and the header. For example, a client that reads an mcpServers file with environment variable expansion:

{
  "mcpServers": {
    "packetexchange": {
      "type": "http",
      "url": "https://packetexchange.io/mcp/http",
      "headers": {
        "Authorization": "Bearer ${PACKETEXCHANGE_API_KEY}"
      }
    }
  }
}

Clients that can only start local commands reach the server through the mcp-remote bridge, which needs a current Node.js LTS release.

Quick start

With the server connected, try a public tool. These need no key and cost nothing:

• "What are the five cheapest voice routes to Kenya on PacketExchange? Include the seller-stated ASR."
• "Give me a summary of the PacketExchange marketplace right now."

More in docs/example-prompts.md.

Tools

wmmn_make_call places the call asynchronously and can speak text, play audio and collect keypad digits once the call is answered. It waits a short time for the result; if the call is still running, wmmn_get_call reads its status, cost and gathered digits later.

The full reference, with parameters, required scopes and cost notes, is in docs/tools.md.

Authentication

Using account tools needs a PacketExchange account with prepaid credit: sign up at packetexchange.io, add credit, and create an API key in the dashboard under API keys.

• The key is sent as an Authorization: Bearer <key> header, configured once in your MCP client. It is the only way the server accepts a key: no tool takes a key as an argument, so the key never passes through the model or into the conversation.
• The public tools (wmmn_list_routes, wmmn_route_details, wmmn_market_summary) work without a key. Any other tool called on a connection without one returns an error asking you to add the header.
• Use a dedicated key with only the scopes the agent needs. Read docs/security.md before using account tools.

Costs

Tools that spend money say so in their descriptions, so the agent knows before it calls them. Calls and messages are billed from your prepaid balance at the route price plus the platform fee (2% of the route rate, capped at $0.001 per call or message). See pricing for details.

Good to know

• ASR and ACD figures on listings are stated by the seller, not measured by PacketExchange.
• wmmn_send_sms returns the send-time outcome (accepted, sent or failed). The delivery outcome, when the route returns a carrier receipt, is available from the REST API (GET /comms/sms/{messageId}) and the sms.delivered and sms.failed webhooks.
• Voice passcodes and spoken call actions can use English, Spanish, French, German, Portuguese and Hindi.
• Test keys (wmmn_test_sk_...) simulate calls and messages against test credit. They can read Switch data but cannot change it, and cannot make x402 top-ups: those requests are refused with TEST_KEY_NOT_ALLOWED.
• Use PacketExchange for transactional messages and calls to people who expect them, such as verification codes, alerts and appointment reminders.

Links

• MCP server overview: packetexchange.io/mcp
• Developers: packetexchange.io/developers
• API reference: packetexchange.io/api-docs
• OpenAPI specification: packetexchange-openapi
• Support: support@packetexchange.io

License

The documentation and configurations in this repository are released under the MIT License.