Get started

Polymarket US for AI agents

Polymarket US is the CFTC-compliant prediction market for United States users to trade on event outcomes. Traders use it to take positions on real-world events under US regulation. 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 Polymarket USSee the 44 actions ↓
E-commerceAPI keyMCP + RESTpolymarket.us
AUDIT LOG · POLYMARKET USPOLICY: acme-support
09:41:07 · claude · u_8f2read
polymarket_us.list_tags
List Tags✓ allowed · 212ms
09:41:08 · claude · u_8f2read
polymarket_us.get_order
Get Order✓ allowed · 164ms
09:41:09 · claude · u_8f2write
polymarket_us.create_order
Create Order✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
polymarket_us.cancel_order
Cancel Order✕ blocked · policy: deny
EVERY POLYMARKET US CALL, ON THE RECORD
01 · USE CASES

What agents do in Polymarket US.

01

Check open orders read-only

List open orders on an account before deciding whether to adjust a position.

02

Get a market's current book

Pull the order book for a market to see current pricing before placing an order.

03

Create an order with approval

Place a new order on a market only after the trader explicitly confirms the terms.

02 · ACTIONS

44 Polymarket US actions, graded by risk.

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

read

36

Look things up. Allowed by default.

  • polymarket_us.get_order
    Get Order
  • polymarket_us.list_tags
    List Tags
  • polymarket_us.list_events
    List Events
  • polymarket_us.list_series
    List Series
  • polymarket_us.list_sports
    List Sports
  • polymarket_us.list_leagues
    List Leagues
  • polymarket_us.list_markets
    List Markets
  • polymarket_us.get_tag_by_id
    Get Tag By ID
  • polymarket_us.list_subjects
    List Subjects
  • polymarket_us.get_activities
    Get Activities
  • polymarket_us.get_market_bbo
    Get Market BBO
  • polymarket_us.get_event_by_id
    Get Event By ID
  • polymarket_us.get_market_book
    Get Market Book
  • polymarket_us.get_open_orders
    Get Open Orders
  • polymarket_us.get_tag_by_slug
    Get Tag By Slug
  • polymarket_us.get_market_by_id
    Get Market By ID
+ 20 MORE

write

4

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

  • polymarket_us.create_order
    Create Order
  • polymarket_us.create_multiple_orders
    Create Multiple Orders
  • polymarket_us.modify_order
    Modify Order
  • polymarket_us.modify_multiple_orders
    Modify Multiple Orders

destructive

4

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

  • polymarket_us.cancel_order
    Cancel Order
  • polymarket_us.cancel_all_open_orders
    Cancel All Open Orders
  • polymarket_us.cancel_multiple_orders
    Cancel Multiple Orders
  • polymarket_us.close_position_order
    Close Position Order
03 · HOW IT WORKS

Polymarket US in three steps.

  1. 01Your users connect Polymarket USThey add their Polymarket US api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “create Order” can wait for the user, and “cancel Order” can be denied outright.
  3. 03Any agent can actYour agent calls Polymarket US 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('polymarket_us', {
  read: 'allow',
  write: 'ask',        // create_order
  destructive: 'deny',  // cancel_order
})

# 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 Polymarket US connects.

Users add their Polymarket US api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Polymarket US 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
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Polymarket US from any agent.

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

More e-commerce apps.

Shopify407 actionsAlpaca100 actionsClover209 actionsCloudcart150 actionsBaselinker106 actionsShippo95 actionsShipengine66 actionsProabono64 actions
ALL E-COMMERCE APPS →
07 · FAQ

Polymarket US and Arc0, answered.

Q01

Can I use Polymarket US with Claude, ChatGPT or Cursor?

Yes. Connect Polymarket US 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 Polymarket US actions you allow.

Q02

How do users connect Polymarket US?

Users add their Polymarket US api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Polymarket US actions can my agent take?

44 in total: 36 read, 4 write and 4 destructive, such as “create Order”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Polymarket US?

Yes. Actions like “cancel Order” 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 Polymarket US too?

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

Get started

Plug Polymarket US into your agent.

Your users connect Polymarket US once, under your brand. Your agent gets 44 actions behind your policies, with every call on the record.

Connect Polymarket USBrowse all apps →

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