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Longbridge for AI agents

Longbridge is a brokerage platform giving investors market data, account balances, and trading access across stocks and other securities from one connected account. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect LongbridgeSee the 161 actions ↓
Finance and accountingOAuth 2.0 (MCP)MCP + RESTlongbridge.com
AUDIT LOG · LONGBRIDGEPOLICY: acme-support
09:41:07 · claude · u_8f2read
longbridge.estimate_max_purchase_quantity
Estimate max purchase quantity✓ allowed · 212ms
09:41:09 · claude · u_8f2write
longbridge.create_watchlist_group
Create watchlist group✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
longbridge.delete_watchlist_group
Delete watchlist group✕ blocked · policy: deny
EVERY LONGBRIDGE CALL, ON THE RECORD
01 · USE CASES

What agents do in Longbridge.

01

Check account balance

Look up account balance and buying power before deciding on a trade, read-only.

02

Pull a stock's candlestick data

Fetch recent candlestick price data for a ticker to review a stock's recent movement.

03

Require approval before placing an order

Hold any order submission for explicit approval, since trades move real money.

02 · ACTIONS

161 Longbridge actions, graded by risk.

Every Longbridge action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

1

Look things up. Allowed by default.

  • longbridge.estimate_max_purchase_quantity
    Estimate max purchase quantity

write

152

Create and change things. Allow, or ask the user first.

  • longbridge.create_watchlist_group
    Create watchlist group
  • longbridge.update_watchlist_group
    Update watchlist group
  • longbridge.now
    Now
  • longbridge.news
    News
  • longbridge.depth
    Depth
  • longbridge.quote
    Quote
  • longbridge.topic
    Topic
  • longbridge.trades
    Trades
  • longbridge.anomaly
    Anomaly
  • longbridge.brokers
    Brokers
  • longbridge.company
    Company
  • longbridge.filings
    Filings
  • longbridge.signals
    Signals
  • longbridge.dca_list
    Dca list
  • longbridge.dca_stop
    Dca stop
  • longbridge.deposits
    Deposits
+ 136 MORE

destructive

8

Delete, cancel or archive. Ask first, or deny outright.

  • longbridge.cancel_order
    Cancel order
  • longbridge.delete_watchlist_group
    Delete watchlist group
  • longbridge.grid_cancel
    Grid cancel
  • longbridge.alert_delete
    Alert delete
  • longbridge.grid_suspend
    Grid suspend
  • longbridge.alert_disable
    Alert disable
  • longbridge.sharelist_delete
    Sharelist delete
  • longbridge.sharelist_remove
    Sharelist remove
03 · HOW IT WORKS

Longbridge in three steps.

  1. 01Your users connect LongbridgeThey sign in to Longbridge on Arc0 Connect, under your brand, and approve the access you ask for.
  2. 02You set the rulesReads run, writes like “create watchlist group” can wait for the user, and “delete watchlist group” can be denied outright.
  3. 03Any agent can actYour agent calls Longbridge through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('longbridge', {
  read: 'allow',
  write: 'ask',        // create_watchlist_group
  destructive: 'deny',  // delete_watchlist_group
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Longbridge connects.

Longbridge runs its own MCP server behind OAuth. Arc0 registers the client, users approve access on Arc0 Connect, and your agent reaches Longbridge through the same endpoint, policies and audit log as every other app.

The same Longbridge connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
OAuth 2.0 (MCP)
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Longbridge from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More finance and accounting apps.

Stripe433 actions44API4 actionsAirwallex7 actionsAiwyn Tax10 actionsAltoviz67 actionsCoupa384 actionsZoho Books265 actionsMaxio177 actions
ALL FINANCE AND ACCOUNTING APPS →
07 · FAQ

Longbridge and Arc0, answered.

Q01

Can I use Longbridge with Claude, ChatGPT or Cursor?

Yes. Connect Longbridge to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Longbridge actions you allow.

Q02

How do users connect Longbridge?

Longbridge runs its own MCP server behind OAuth. Arc0 registers the client, users approve access on Arc0 Connect, and your agent reaches Longbridge through the same endpoint, policies and audit log as every other app.

Q03

Which Longbridge actions can my agent take?

161 in total: 1 read, 152 write and 8 destructive, such as “create watchlist group”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Longbridge?

Yes. Actions like “delete watchlist group” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Longbridge too?

Yes. The same Longbridge connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Longbridge into your agent.

Your users connect Longbridge once, under your brand. Your agent gets 161 actions behind your policies, with every call on the record.

Connect LongbridgeBrowse all apps →

Free to build · MCP + REST · Audit log on every plan