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Guides & support

Find product help, developer documentation, and agent setup guidance.

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WorkspacesSendContactsImports
Select workspace

Connect all. Import your files and contacts from your apps.

Bring in customer addresses and PDFs from Salesforce, QuickBooks, HubSpot, Zoho CRM, Google Drive, OneDrive, Dropbox, and other supported app sources without giving PostBridge write access.

MCP

Connect PostBridge to MCP clients

Use PostBridge from MCP-capable clients such as Claude, ChatGPT, Codex, and Claude Code. ChatGPT connects with PostBridge OAuth; clients that support custom headers use a workspace API key.

To disconnect ChatGPT, remove PostBridge in ChatGPT and revoke its connected-app grant in PostBridge. For API-key clients, remove the server and rotate or revoke the key.

The complete /mcp profile uses a subscription-backed API & MCP key. The ChatGPT /mcp/openai profile uses OAuth 2.1. Choose a workspace with an eligible effective entitlement. Paid workspaces use an active or trialing subscription. Grandfathered workspaces remain eligible through their effective entitlement without a new billing checkout. A send/full API/MCP key or OAuth send grant uses its sponsor's existing licensed Team member slot; it adds no licensed capacity and reserves no additional capacity. A read-only API/MCP key or OAuth grant uses no sponsor slot. Both profiles use the selected workspace’s wallet, including its auto-reload policy. Direct REST x402 PAYG and Clio pay-per-letter checkout stay separate from the Business workspace subscription.

Claude Cowork

Claude

Compatibility preview

Compatibility reference for Claude workspace flows that accept HTTP MCP servers with custom headers.

Claude Code

Claude

Terminal-based Claude agent with MCP tool support.

ChatGPT

OpenAI

OpenAI assistant surface with Developer Mode apps and PostBridge OAuth.

Codex

OpenAI

OpenAI coding agent with terminal MCP configuration.

OpenClaw

Agent orchestrator

Compatibility preview

Compatibility reference for OpenClaw builds that support HTTP MCP servers with custom headers.

Hermes

Agent orchestrator

Compatibility preview

Compatibility reference for autonomous agent orchestrators that support HTTP MCP with custom headers.

api key cli

Claude Code

  1. Sign in to PostBridge SaaS, open Settings > API & MCP, and copy the test or production key for this workspace. Replace YOUR_POSTBRIDGE_API_KEY in the command below.
  2. Run the setup command in the terminal where Claude Code is installed.
  3. Verify PostBridge appears as connected in the /mcp server list.
Terminal
claude mcp add --scope user --transport http --header "Authorization: Bearer YOUR_POSTBRIDGE_API_KEY" postbridge https://api.postbridge.ai/mcp
Legal

Clio Manage

Connect Clio so matter documents can be sent through PostBridge with contact and file sharing controlled at send time.

Contacts

Team address book

Imported contacts and opted-in sender or recipient addresses are visible to workspace members. CSV export is owner-only.

PDF upload

Upload a PDF to send

On the Send page, upload your letter as a PDF. We'll read the recipient and return addresses from it and show you a preview, so you can check everything before it's printed and mailed.