Connect an existing carrier account using OAuth 2.0 on Shippo

Shippo: Connect an existing carrier account using OAuth 2.0. It runs on your own Shippo account: connect it once in the Relvo app and Relvo adds its credentials server-side. Relvo charges no usage fee; Shippo may bill that account under its own plan.

Connect ShippoAll Shippo toolsAPI docs

Try Connect an existing carrier account using OAuth 2.0 now

Compose the request, copy the prompt, and run it in your agent. It runs on your connected Shippo account.

Prompt composerMarkdown
Shipposhippo__initiate_oauth2_signin
Open Relvo
Try asking

More Shippo tools

The rest of the Shippo shelf. Every endpoint runs on the same Shippo connection.

71 tools
List all addressesshippo__list_addressesShippoyour accountCreate a new addressshippo__create_addressShippoyour accountRetrieve an addressshippo__get_addressShippoyour accountValidate an addressshippo__validate_addressShippoyour accountCreate a batchshippo__create_batchShippoyour accountRetrieve a batchshippo__get_batchShippoyour accountAdd shipments to a batchshippo__add_shipments_to_batchShippoyour accountPurchase a batchshippo__purchase_batchShippoyour accountRemove shipments from a batchshippo__remove_shipments_from_batchShippoyour accountList all carrier accountsshippo__list_carrier_accountsShippoyour accountCreate a new carrier accountshippo__create_carrier_accountShippoyour accountRetrieve a carrier accountshippo__get_carrier_accountShippoyour accountUpdate a carrier accountshippo__update_carrier_accountShippoyour accountConnect an existing carrier account using OAuth 2.0shippo__initiate_oauth2_signinYou are hereyour accountAdd a Shippo carrier accountshippo__register_carrier_accountShippoyour accountGet Carrier Registration statusshippo__get_carrier_registration_statusShippoyour accountList all customs declarationsshippo__list_customs_declarationsShippoyour accountCreate a new customs declarationshippo__create_customs_declarationShippoyour accountRetrieve a customs declarationshippo__get_customs_declarationShippoyour accountList all customs itemsshippo__list_customs_itemsShippoyour accountCreate a new customs itemshippo__create_customs_itemShippoyour accountRetrieve a customs itemshippo__get_customs_itemShippoyour accountCreate a JWTshippo__create_embedded_authorizationShippoyour accountGenerate a live rates requestshippo__create_live_rateShippoyour accountShow current default parcel templateshippo__get_default_parcel_templateShippoyour accountUpdate default parcel templateshippo__update_default_parcel_templateShippoyour accountClear current default parcel templateshippo__delete_default_parcel_templateShippoyour accountList all manifestsshippo__list_manifestsShippoyour accountCreate a new manifestshippo__create_manifestShippoyour accountRetrieve a manifestshippo__get_manifestShippoyour account

Set up Connect an existing carrier account using OAuth 2.0 for your agent

Pick the client you use, then pick a route: Automatic is that client's own link, command or prompt, and Manual is the same install done by hand, or the tool opened in the Relvo app. Both end at the same OAuth sign-in, with nothing installed per tool.

Automatic way

Open the plugin page with the details ready.

ChatGPT takes custom MCP servers as plugins. The button opens the right page; copy the name and URL into the form and authorise once.

Open ChatGPT plugins

  1. Add a custom MCP server

    On the plugins page, click + and choose Add custom MCP server.

  2. Fill in the connection

    NameRelvo
    Connectionhttps://app.relvo.si/mcp

  3. Authorise and create

    Pick OAuth, tick the confirmation and click Create as a plugin. Approve Relvo in the browser window ChatGPT opens.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The client inspects this operation and runs it on your connected account.

Custom MCP servers are set up in ChatGPT on the web, not in the mobile app. Connect once and every chat can call Relvo.

Manual way

Set it up from ChatGPT's settings.

The same connector, reached through the settings menu instead of the plugin page.

  1. Open Apps & Connectors

    In ChatGPT, open Settings → Apps & Connectors and create a new custom connector.

  2. Name it Relvo

    NameRelvo

  3. Point it at Relvo

    Connectionhttps://app.relvo.si/mcp

  4. Authenticate

    Choose OAuth, continue, and approve Relvo in the browser. ChatGPT saves the connector to your account.

  5. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The agent checks this operation, runs it on your connection, then relays the provider's response verbatim.

  6. Open shippo__initiate_oauth2_signin in the app

    URL
    https://app.relvo.si/catalog/shippo__initiate_oauth2_signin

    Connect Shippo under Connections in the Relvo app, then inspect this operation's input schema before running it.

This operation runs on your own Shippo account. Relvo charges no usage fee; Shippo may bill that account on its own plan.

Automatic way

One link fills in the dialog.

On a desktop browser this opens Claude's Add custom connector form with Relvo's name and MCP URL already in place. Click Add and sign in — there is nothing to type.

Add the Relvo connector

  1. Open the dialog

    Click the button above in the browser where you are signed in to Claude. Customize → Connectors opens with the custom-connector form ready.

  2. Add and authorise

    Click Add, then choose Sign in now under Authentication. Relvo signs you in over OAuth, so no token or API key is pasted into Claude.

  3. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The client inspects this operation and runs it on your connected account.

Manual way

The same connector, typed by hand.

Use this on a phone, in a locked-down workspace, or whenever you would rather add the connector through Claude's own menu.

  1. Open Connectors

    In Claude, go to Customize → Connectors and choose + Add → Add custom connector.

  2. Name the connector

    NameRelvo

  3. Paste the MCP URL

    Server URLhttps://app.relvo.si/mcp

  4. Sign in

    Click Add, choose Sign in now under Authentication, and approve Relvo in the OAuth window. The Relvo tools appear under the connector.

  5. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The agent checks this operation, runs it on your connection, then relays the provider's response verbatim.

  6. Open shippo__initiate_oauth2_signin in the app

    URL
    https://app.relvo.si/catalog/shippo__initiate_oauth2_signin

    Connect Shippo under Connections in the Relvo app, then inspect this operation's input schema before running it.

This operation runs on your own Shippo account. Relvo charges no usage fee; Shippo may bill that account on its own plan.

Automatic way

One command, then one sign-in.

The CLI registers Relvo with HTTP transport and writes it into your Claude Code config; authentication happens in the browser.

  1. Run the command

    BASH
    claude mcp add --transport http relvo https://app.relvo.si/mcp

  2. Authenticate once

    Open a session and run /mcp. Choose Relvo → Authenticate; Claude Code opens Relvo's OAuth page and stores the token for the project.

  3. Check the list

    BASH
    claude mcp list

    Relvo shows as connected, with every catalog tool behind it.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The client inspects this operation and runs it on your connected account.

The command uses local scope by default. Add --scope user to make Relvo available in every project, or --scope project to share it through the repository.

Manual way

Write it into .mcp.json.

Project scope lives in a file, so the whole team gets Relvo without running a command.

  1. Add the server

    JSON · .mcp.json
    {
  "mcpServers": {
    "relvo": {
      "type": "http",
      "url": "https://app.relvo.si/mcp"
    }
  }
}

    Create .mcp.json in the project root and add relvo as an HTTP server.

  2. Reload and sign in

    Start a Claude Code session, run /mcp, choose Relvo → Authenticate, then reload. The tools are available in that project.

  3. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The agent checks this operation, runs it on your connection, then relays the provider's response verbatim.

  4. Open shippo__initiate_oauth2_signin in the app

    URL
    https://app.relvo.si/catalog/shippo__initiate_oauth2_signin

    Connect Shippo under Connections in the Relvo app, then inspect this operation's input schema before running it.

The same entry works for every project when it is added at user scope instead of project scope. This operation runs on your own Shippo account. Relvo charges no usage fee; Shippo may bill that account on its own plan.

Automatic way

Hand the setup to Hermes.

Hermes can edit its own config, so one instruction is enough: it writes Relvo into mcp_servers, reloads, and reports the tools it can now call.

  1. Copy the setup prompt

    PROMPT
    Add Relvo as a remote MCP server named "relvo": url https://app.relvo.si/mcp, auth oauth. Follow https://app.relvo.si/SKILL.md, reload MCP, then list the Relvo tools.

  2. Paste it into a Hermes session

    Hermes adds the remote server to ~/.hermes/config.yaml and reloads its MCP connections.

  3. Approve the sign-in

    Open the OAuth link Hermes prints and approve Relvo once. The token is cached, so later sessions do not ask again.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The client inspects this operation and runs it on your connected account.

Manual way

Add it to ~/.hermes/config.yaml.

Two settings and one reload — the same entry Hermes would write itself.

  1. Open the config

    Edit ~/.hermes/config.yaml, the file Hermes reads at start-up.

  2. Add the server

    YAML
    mcp_servers:
  Relvo:
    url: https://app.relvo.si/mcp
    auth: oauth

  3. Reload and sign in

    In a session, run /reload-mcp, then approve the OAuth prompt Hermes shows. Tokens are cached under ~/.hermes/mcp-tokens/.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The agent checks this operation, runs it on your connection, then relays the provider's response verbatim.

  5. Open shippo__initiate_oauth2_signin in the app

    URL
    https://app.relvo.si/catalog/shippo__initiate_oauth2_signin

    Connect Shippo under Connections in the Relvo app, then inspect this operation's input schema before running it.

This operation runs on your own Shippo account. Relvo charges no usage fee; Shippo may bill that account on its own plan.

Automatic way

Hand the install to Cursor.

The button opens Cursor's MCP install dialog with the server name and URL already attached.

Add Relvo to Cursor

  1. Open the install prompt

    Click the button on the machine where Cursor is installed. Cursor receives a server named relvo pointing at https://app.relvo.si/mcp.

  2. Install and authenticate

    Confirm the install, then click Authenticate. Cursor completes Relvo's OAuth in the browser.

  3. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The client inspects this operation and runs it on your connected account.

The install link opens Cursor directly, so it does nothing in a browser that has never installed the editor.

Manual way

Edit ~/.cursor/mcp.json.

Use the global or the project file when you want the entry under your own control.

  1. Open the MCP config

    Edit ~/.cursor/mcp.json for every project, or .cursor/mcp.json inside the repository for one.

  2. Add Relvo

    JSON
    {
  "mcpServers": {
    "relvo": {
      "url": "https://app.relvo.si/mcp"
    }
  }
}

  3. Reload Cursor

    Save the file and reload the window. Relvo appears in the MCP panel, and Authenticate finishes the sign-in.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The agent checks this operation, runs it on your connection, then relays the provider's response verbatim.

  5. Open shippo__initiate_oauth2_signin in the app

    URL
    https://app.relvo.si/catalog/shippo__initiate_oauth2_signin

    Connect Shippo under Connections in the Relvo app, then inspect this operation's input schema before running it.

This operation runs on your own Shippo account. Relvo charges no usage fee; Shippo may bill that account on its own plan.

Automatic way

Ask the Bot to wire it up.

Grok Bot configures connections from the conversation, so the quickest route is a single instruction with Relvo's address.

  1. Copy the setup prompt

    PROMPT
    Add a custom MCP server called relvo at https://app.relvo.si/mcp with OAuth sign-in, then list the Relvo tools.

  2. Paste it into a Bot chat

    The Bot repeats the server name and URL and asks you to confirm. Check them and select Add it.

  3. Authorise

    Select Authorize on the card the Bot sends and approve Relvo in the browser once. The Bot can then call the catalog from any chat.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The client inspects this operation and runs it on your connected account.

Manual way

Name the server yourself in the chat.

Grok Bot's settings have no field for a server URL; custom MCP servers are added from the conversation.

  1. Describe the server

    NameRelvo
    Server URLhttps://app.relvo.si/mcp

    Ask the Bot to add a custom server with this name and URL. Say custom server, or it may offer a catalog plugin instead.

  2. Confirm

    The Bot repeats the name and URL. Check that the URL is https://app.relvo.si/mcp, then select Add it.

  3. Authorise

    Select Authorize on the card the Bot sends, sign in and allow access. The Relvo tools appear once you are signed in.

  4. Ask for Connect an existing carrier account using OAuth 2.0

    PROMPT
    Using Relvo, call `shippo__initiate_oauth2_signin` on my Shippo connection to connect an existing carrier account using oauth 2.0. Return Shippo's response as it comes back.

    The agent checks this operation, runs it on your connection, then relays the provider's response verbatim.

  5. Open shippo__initiate_oauth2_signin in the app

    URL
    https://app.relvo.si/catalog/shippo__initiate_oauth2_signin

    Connect Shippo under Connections in the Relvo app, then inspect this operation's input schema before running it.

This operation runs on your own Shippo account. Relvo charges no usage fee; Shippo may bill that account on its own plan.

Use Shippo with any agent

Pick the client you already use. Every one reaches the same catalog through one Relvo key.

All agents
ChatGPTUse Shippo with ChatGPTClaudeUse Shippo with ClaudeClaude CodeUse Shippo with Claude CodeHermes AgentUse Shippo with Hermes AgentCursorUse Shippo with CursorGrok BotUse Shippo with Grok BotCodexUse Shippo with CodexOpenClawUse Shippo with OpenClawAny MCP ClientUse Shippo with Any MCP Client

Explore other platforms

Other shelves in the same catalog. One key reaches all of them.

Browse all platforms
Google SearchBrowse Google Search in the Relvo app. Inspect each tool and compare providers before running a call.11 endpointsXBrowse X in the Relvo app. Inspect each tool and compare providers before running a call.343 endpointsInstagramBrowse Instagram in the Relvo app. Inspect each tool and compare providers before running a call.220 endpointsTikTokBrowse TikTok in the Relvo app. Inspect each tool and compare providers before running a call.245 endpoints

Frequently asked questions

Short answers about the key, the price and the call itself.

Give your agent Shippo and 158,803 tools

One token reaches your Shippo account and every catalog tool. Start free.

Start freeBrowse the catalog