# Postgrid AI integration on Definable

> PostGrid provides APIs for automating direct mail and address verification services, enabling businesses to send letters, postcards, and checks, as well as verify and standardize addresses in real-time.

## What this connects

PostGrid provides APIs for automating direct mail and address verification services, enabling businesses to send letters, postcards, and checks, as well as verify and standardize addresses in real-time.

Vendor: https://dashboard.postgrid.com/signup

## Tools available

**60** tools available. First 12:

- `POSTGRID_CANCEL_BOX` — Cancel Box — Tool to cancel a box order by its ID. Use when you need to cancel a pending box shipment.
- `POSTGRID_CANCEL_CHEQUE` — Cancel Cheque — Tool to cancel a cheque order by its ID. Only works when the cheque has 'ready' status. Use when you need to cancel a pending cheque before it is mailed.
- `POSTGRID_CANCEL_CHEQUE_WITH_NOTE` — Cancel Cheque with Note — Tool to cancel a cheque order with a cancellation note. Use when you need to cancel a cheque and provide a reason for the cancellation.
- `POSTGRID_CANCEL_POSTCARD` — Cancel Postcard — Tool to cancel a postcard order. Use when you need to cancel a postcard that has status 'ready'.
- `POSTGRID_CANCEL_POSTCARD_WITH_NOTE` — Cancel Postcard With Note — Tool to cancel a postcard order with an optional cancellation note. Use when you need to cancel a postcard that is in 'ready' status. Once cancelled, the status changes to 'cancelled' and the response includes cancellation details.
- `POSTGRID_CANCEL_RETURN_ENVELOPE_ORDER` — Cancel Return Envelope Order — Tool to cancel a return envelope order. Use when you need to cancel a pending return envelope order using the return envelope ID and order ID.
- `POSTGRID_CREATE_BANK_ACCOUNT` — CREATE_BANK_ACCOUNT — Tool to create a new bank account for print & mail service.
- `POSTGRID_CREATE_BOX` — Create Box — Tool to create a box mailing order for letters with plastic cards or cheques. Use when you need to send multiple cheques in a secure box.
- `POSTGRID_CREATE_CHEQUE` — Create Cheque — Tool to create a cheque order for physical cheque mailing. Use when you need to send a payment via printed cheque. Requires a valid bank account ID and recipient contact details.
- `POSTGRID_CREATE_CONTACT` — Create Contact — Tool to create a new contact in PostGrid. Use after collecting contact's name, address, and optional metadata.
- `POSTGRID_CREATE_LETTER` — Create Letter — Tool to create and send a letter via PostGrid. Use when recipient, sender, and content details are ready.
- `POSTGRID_CREATE_POSTCARD` — Create Postcard — Tool to create and send a postcard via PostGrid. Use when recipient, sender, and content (HTML, template, or PDF) are ready.

## Auth

Auth schemes: `API_KEY`.

## How agents use Postgrid

Inside a Definable workflow, Postgrid is one of the tools the **Distributor specialist** can call. Example coordination patterns:

- **Researcher → Postgrid** — the Researcher (GPT-5.5) pulls context from Postgrid (records, threads, documents), synthesises findings, and briefs the rest of the team.
- **Writer → Distributor → Postgrid** — the Writer (Claude Opus 4.7) drafts copy in brand voice, the Verifier passes it, then the Distributor writes the result into Postgrid (create record, post message, draft email).
- **Designer / Engineer → Distributor → Postgrid** — the Designer ships an asset or the Engineer ships a code change, the Distributor delivers it via Postgrid (attach file, open PR comment, post status).

The Verifier checks every Postgrid call. On rate limit, schema drift, or auth refresh it self-heals and retries — the workflow completes without manual intervention.

## Categories

- developer tools — https://definable.ai/apps/category/developer-tools/

## Related

- HTML page: https://definable.ai/apps/postgrid/
- Same category (developer tools): https://definable.ai/apps/category/developer-tools/
- All integrations: https://definable.ai/apps/
- Workflow (multi-agent loop): https://definable.ai/workflow/
- Apps llms.txt index: https://definable.ai/llms-apps.txt