How to connect Postgrid to Hermes Agent
Connect Postgrid to Hermes with ClawLink: paste your Postgrid key once and 60 tools work from chat. No MCP server to run, nothing stored on your machine.
PostgridAPI KEYMCPPostGrid 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.. Once connected, Hermes Agent can read and act on Postgrid from chat — pairing, token refresh, and tool wiring handled for you.
Most guides for giving Hermes Agent Postgrid access start with registering your own OAuth app or pasting API keys into env files, then leave the token refresh and tool wiring to you. ClawLink gives Hermes a more practical Postgrid setup: pair once in the browser and your always-on Hermes agent can act on Postgrid for you, reading and doing real work on your behalf with no auth, token refresh, or tool wiring to build yourself.
Setup
It takes three steps to connect Hermes to Postgrid.
1Install and pair
Install the ClawLink plugin, then pair Hermes with a one-time browser approval:
hermes plugins install ClawLink-HQ/hermes-plugin --enable- 2
Connect Postgrid
Paste your API key in the dashboard.
- 3
Use it from chat
Ask Hermes Agent: "What can you do with Postgrid?"
Install by command
The prompt above walks Hermes through this. By hand, it is four commands and a browser approval:
hermes plugins install ClawLink-HQ/hermes-plugin --enable
hermes clawlink begin # prints an approval link — open it and approve
hermes clawlink finish # after approving in the browser
hermes clawlink testThen connect Postgrid in the ClawLink dashboard — paste your Postgrid API key once.
Verify the connection by asking Hermes:
Pull the relevant data from Postgrid, summarize it in plain English, and point out anything that needs attention.
Using a different agent?
The Hermes plugin is one client of ClawLink's MCP server. Claude Code, Cursor, Codex, or any agent that can run a shell command pairs with the same ClawLink account through the CLI:
npx -y @useclawlink/cli loginlogin opens the same browser approval and stores a credential locally. Once Postgrid is connected in the dashboard, that agent calls the same 60 Postgrid tools over MCP. Full setup for MCP clients and shell agents: connect apps to any AI agent.
Postgrid MCP for Hermes
Looking for a Postgrid MCP server for Hermes Agent? ClawLink connects Postgrid to Hermes Agent and exposes 60 Postgrid tools your agent can call over MCP, with hosted auth and nothing to run or maintain yourself. Using OpenClaw instead? The OpenClaw Postgrid integration works the same way.
What the Hermes Agent Postgrid integration can do
60 Postgrid tools are ready for Hermes Agent once the account is connected. The 30 below are the ones people reach for most; your agent can call all 60.
30 of 60 Postgrid tools for Hermes
| Tool | What it does |
|---|---|
Get bank account postgrid_get_bank_account | Retrieve a bank account |
Get box postgrid_get_box | Retrieve a specific box order by ID |
Get cheque postgrid_get_cheque | Retrieve a specific cheque by ID |
Get contact postgrid_get_contact | Retrieve a contact |
Get letter postgrid_get_letter | Retrieve a letter |
Get postcard postgrid_get_postcard | Retrieve a specific postcard by ID |
Get return envelope postgrid_get_return_envelope | Retrieve a return envelope |
Get return envelope order postgrid_get_return_envelope_order | Retrieve a specific return envelope order |
Get template postgrid_get_template | Retrieve a template |
Get tracker postgrid_get_tracker | Retrieve a tracker |
Get webhook postgrid_get_webhook | Retrieve details of a specific webhook by its ID |
List bank accounts postgrid_list_bank_accounts | List bank accounts |
List boxes postgrid_list_boxes | List box orders |
List cheques postgrid_list_cheques | List cheques with optional filters and pagination |
List contacts postgrid_list_contacts | List contacts |
List events postgrid_list_events | Retrieve a list of webhook events with optional pagination |
List letters postgrid_list_letters | List letters |
List postal statements postgrid_list_postal_statements | List all postal statements for billing and tracking purposes |
List postcards postgrid_list_postcards | Retrieve a list of postcards with optional filtering and pagination |
List return envelope orders postgrid_list_return_envelope_orders | List all return envelope orders for a specific return envelope |
List return envelopes postgrid_list_return_envelopes | List return envelopes |
List self mailers postgrid_list_self_mailers | List self-mailers |
List sub organizations postgrid_list_sub_organizations | List sub-organizations |
List template editor sessions postgrid_list_template_editor_sessions | List template editor sessions |
List templates postgrid_list_templates | List templates |
List tracker visits postgrid_list_tracker_visits | List all visits for a tracker |
List trackers postgrid_list_trackers | List all trackers |
List webhook invocations postgrid_list_webhook_invocations | List previous invocations of a webhook with response status codes |
List webhooks postgrid_list_webhooks | Retrieve a list of configured webhooks with optional filtering and pagination |
Create bank account postgrid_create_bank_account | Create a new bank account for print & mail service |
Try it: find the Postgrid tool you need
Browse the 30 Postgrid tools
Click any tool to see exactly what Hermes can do and copy a ready-to-use prompt.
Example prompts
Pull the relevant data from Postgrid, summarize it in plain English, and point out anything that needs attention.
Pull the relevant data from Postgrid, summarize it in plain English, and point out anything that needs attention.
Pull the relevant data from Postgrid, summarize it in plain English, and point out anything that needs attention.
Pull the relevant data from Postgrid, summarize it in plain English, and point out anything that needs attention.
ClawLink vs. building it yourself
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want Postgrid working from chat.
| Manual | ClawLink | |
|---|---|---|
| Credential handling | Collect, validate, store, and rotate the Postgrid API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected Postgrid account becomes available to the agent without you building credential management. |
| Ongoing maintenance | You own refresh logic, permission debugging, environment config, and every provider-specific edge case for Postgrid. | ClawLink handles the repetitive integration plumbing so your team can focus on the workflow instead of the infrastructure. |
| Agent usability | You still need to expose the right Postgrid actions to the runtime in a format your agent can reliably use. | 60 tools for Postgrid are already exposed through ClawLink, so the agent can read and act from chat immediately. |
ClawLink vs. Composio
Composio also exposes Postgrid to AI agents. It is developer infrastructure: Python and TypeScript SDKs, an MCP server, and a catalog past 1,000 apps, aimed at teams shipping agent products. ClawLink is built for Hermes Agent users instead. You install the plugin once, connect Postgrid in the browser, and the 60 tools above work from chat. There is no SDK and no config file, and the Postgrid key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full Composio alternatives comparison.
Troubleshooting
Hermes paired but still can't use Postgrid
Pairing is a two-step handshake: run hermes clawlink begin, approve the link in your browser, then run hermes clawlink finish. If you ran finish before approving, or the approval link expired, run hermes clawlink begin again to get a fresh link. Confirm the plugin was installed with --enable, then verify with hermes clawlink test.
Connection succeeds but no tools appear
Reconnect Postgrid from the dashboard, then start a fresh chat if the runtime still has the old tool catalog loaded.
"Tool schema not loaded yet" error when calling Postgrid tools
Postgrid tool schemas load on demand the first time a tool runs and are cached after that, so this error usually clears on its own: wait a few seconds and retry the same request. If every Postgrid call keeps failing with it in a fresh chat, reconnect from the dashboard, and contact support if it still persists — that pattern points to a configuration problem on our side, not something you can fix by reconnecting again.
Postgrid returns 403 or "permission denied" on one action while others work
Two usual causes. The connected account may not have access to the specific workspace, inbox, store, or project in the request — check that first. If access looks right, the agent may have sent a placeholder value (like "YOUR_ID" or an example id from documentation) instead of a real one: ask it to run a list or search tool first, then retry the action with a real id from those results. Most failures at this stage are one of these two, not ClawLink bugs.
API key setup works but results look incomplete
Double-check that the API key for Postgrid has the right scopes or account access. A valid key can still be too limited for some reads or writes.
FAQ
Is there a Hermes Agent Postgrid integration?
Yes. ClawLink is the fastest way to connect Hermes to Postgrid: link your Postgrid account once in the browser and Hermes Agent can call the Postgrid API through 60 ready-made tools — no custom code or token handling.
How do I connect Postgrid to Hermes with ClawLink?
Install the plugin with hermes plugins install ClawLink-HQ/hermes-plugin --enable, then pair once: run hermes clawlink begin, approve the link in your browser, and run hermes clawlink finish. Connect Postgrid in the dashboard and Hermes can use it from the next message — no config files, and the Postgrid key you paste is stored server-side instead of in your environment.
How long does it take to connect Postgrid to Hermes Agent?
About two minutes. Sign in, click Connect next to Postgrid in the dashboard, authenticate, and Hermes Agent can use it from the next chat message.
Why use ClawLink instead of wiring Postgrid up myself?
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want Postgrid working from chat.
Hermes paired but still can't use Postgrid
Pairing is a two-step handshake: run hermes clawlink begin, approve the link in your browser, then run hermes clawlink finish. If you ran finish before approving, or the approval link expired, run hermes clawlink begin again to get a fresh link. Confirm the plugin was installed with --enable, then verify with hermes clawlink test.
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