Junto Mcp
@vrllrv
About Junto Mcp
The payment protocol for people and agents. One MCP server, any payment rail. Multi-provider routing (Woovi/Pix, Stripe, Belvo), spending guardrails, human-in-the-loop confirmation, and audit logging.
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"junto-mcp": {
"command": "npx",
"args": [
"-y",
"junto-mcp"
],
"env": {
"WOOVI_APP_ID": "your-woovi-app-id",
"JUNTO_DAILY_LIMIT": "50000",
"JUNTO_TX_MAX": "10000",
"JUNTO_CONFIRM_ABOVE": "5000"
}
}
}
}Tools
7Send money to a destination via the best available provider. Amount in cents.
Create a payment request, invoice, or QR code.
Check payment or charge status by correlation ID.
Refund a completed payment by correlation ID.
Check available funds on a payment provider.
List configured payment providers and their capabilities.
Check current spending limits and today's usage (all values in cents).
Overview
What is Junto Mcp?
Junto Mcp is a payment protocol that lets AI assistants send and receive money through any payment rail, with built-in guardrails and human-in-the-loop confirmation. It exposes a universal payment toolkit to any MCP-compatible client like Claude or Cursor.
How to use Junto Mcp?
Install globally with npm install -g junto-mcp, set your provider API key (e.g., WOOVI_APP_ID), then run junto-mcp. For Claude Desktop or Cursor, add the server configuration in the mcpServers JSON block with the appropriate environment variables.
Key features of Junto Mcp
- Universal payment toolkit accessible via MCP protocol
- Supports
pay,charge,status,refund,balance,providers, andlimitstools - Configurable spending limits per day and per transaction
- Human-in-the-loop confirmation for high-value payments
- Provider allowlisting and destination type filtering
- Full audit ledger stored as JSONL files
Use cases of Junto Mcp
- Pay invoices or split bills directly through an AI assistant
- Send instant Pix payments in Brazil via Woovi
- Create payment requests or QR codes for remote agents
- Automate recurring payments with Pix AutomΓ‘tico
- Enable agent-to-agent budget delegation (planned)
FAQ from Junto Mcp
What payment providers are supported?
Woovi/OpenPix (Pix in Brazil) is currently shipped. Belvo, Stripe, Wise, Mercado Pago, and PayPal are planned.
What are the default guardrail limits?
Daily limit defaults to 50,000 cents (R$500), per-transaction maximum is 20,000 cents (R$200), and human confirmation is required above 5,000 cents (R$50). All amounts are in the smallest currency unit.
How does human-in-the-loop confirmation work?
When a transaction exceeds the JUNTO_CONFIRM_ABOVE threshold, the server pauses and returns a confirmation prompt. The agent must relay the details to the user and receive approval before proceeding.
Where is the audit log stored?
Every transaction is logged to ~/.junto/audit-YYYY-MM-DD.jsonl with timestamp, action, amount, provider, destination, and status.
How do I add a new provider?
Implement the PaymentProvider interface (pay, charge, status, refund, balance, info methods) in a single file, then register it in src/index.ts. A template is available at src/providers/_template.ts.
Frequently asked questions
What payment providers are supported?
Woovi/OpenPix (Pix in Brazil) is currently shipped. Belvo, Stripe, Wise, Mercado Pago, and PayPal are planned.
What are the default guardrail limits?
Daily limit defaults to 50,000 cents (R$500), per-transaction maximum is 20,000 cents (R$200), and human confirmation is required above 5,000 cents (R$50). All amounts are in the smallest currency unit.
How does human-in-the-loop confirmation work?
When a transaction exceeds the `JUNTO_CONFIRM_ABOVE` threshold, the server pauses and returns a confirmation prompt. The agent must relay the details to the user and receive approval before proceeding.
Where is the audit log stored?
Every transaction is logged to `~/.junto/audit-YYYY-MM-DD.jsonl` with timestamp, action, amount, provider, destination, and status.
How do I add a new provider?
Implement the `PaymentProvider` interface (pay, charge, status, refund, balance, info methods) in a single file, then register it in `src/index.ts`. A template is available at `src/providers/_template.ts`.
Basic information
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