How to integrate PayChasers MCP with Atomic Agent

Connect Atomic Agent to PayChasers MCP. Send payment reminder for invoice inv-123, list overdue invoices older than 30 days, and more using natural language, with authentication handled for you.

PayChasers logoPayChasers
Api Key

PayChasers automates payment reminders, client management, and follow-ups for overdue accounts. Helps reduce late payments and streamlines accounts receivable workflows.

7 Tools

Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including PayChasers.

This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a PayChasers account. See the Atomic Agent documentation for installation instructions.

Also integrate PayChasers with

How Atomic Agent connects to PayChasers

Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.

Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

Connect PayChasers to Atomic Agent

  1. Sign up or sign in to the Composio dashboard. Copy your API key.
  2. In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
  3. Ask Atomic Agent to do something in PayChasers. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your PayChasers account, then return to Atomic Agent to continue.

Headless setup

Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY

What is the PayChasers MCP server, and what's possible with it?

The PayChasers MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your PayChasers account. It provides structured and secure access so your agent can perform PayChasers operations on your behalf.

Use PayChasers from Atomic Agent

With your account connected, ask Atomic Agent to work with PayChasers in natural language. You can connect more apps through the same Composio integration as you need them.

Visit the Atomic Agent website or inspect the Atomic Agent source code.

Troubleshooting

Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See Composio pricing for the current limits that apply to your connection.

TOOLS

Supported Tools

Every PayChasers action and event your agent gets out of the box.

Create Chase

Create a payment chase and potentially send its initial reminder immediately.

Create Client

Create a persistent PayChasers client from a name, billing email, and notes.

Get Current User

Return the connected PayChasers account profile, plan, and default currency; use this to identify the account or check its tier.

List Chases

Return chases, optionally filtered by exact status and capped by a truncating limit; the API provides no continuation mechanism.

List Clients

Return all clients visible to the connected PayChasers account.

Mark Chase Paid

Irreversibly mark a chase as paid and stop its automated follow-ups.

Send Follow-Up

Immediately send one manual follow-up for a chase in the selected tone.

FAQ

Frequently asked questions

With a standalone PayChasers MCP server, the agents and LLMs can only access a fixed set of PayChasers tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from PayChasers and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Atomic Agent fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right PayChasers tools.

Yes, absolutely. You can configure which PayChasers scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your PayChasers data and credentials are handled as safely as possible.

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