Polymarket Trading

---
name: polymarket-trading
description: Use when the user wants to actually PLACE, manage, or redeem bets on Polymarket (not just read odds — that's blockrun_markets). Covers setup (deposit wallet, funding, approvals), buy/sell with confirm gating, positions, redeeming winnings, geoblock handling, and the end-to-end demo flow.
---

# Polymarket Trading (blockrun_polymarket)

Real-money trading on Polymarket's CLOB V2 (Polygon), signed locally by the
user's BlockRun wallet key. **Data discovery stays on `blockrun_markets`** —
this tool only trades.

## Mental model

- **Signer** = the BlockRun wallet key (`~/.blockrun/.session` by default; a
  `BLOCKRUN_WALLET_KEY` env var or an existing agent `wallet.json` takes
  precedence). Never leaves the machine. `setup` prints the actual signer
  address — back up the key behind it, wherever it lives (key file or env-var
  value).
- **Deposit wallet** = a Polygon vault contract derived from that key
  (POLY_1271). It holds the betting funds in **pUSD** and only honors the
  signer's EIP-712 signatures. Deploy/approve/redeem are **gasless** (relayer).
- **Money separation**: bets spend pUSD on Polygon; x402 API fees spend USDC on
  Base. The budget ledger does NOT cover bets — `confirm:true` + caps do.
- **Zero setup**: no Polymarket account, no API keys, no gas token. On first
  `setup` the MCP bootstraps a builder key from the user's OWN wallet, then
  derives + deploys the vault (all gasless). Geoblock is handled by default —
  CLOB traffic routes through BlockRun's Finland egress out of the box.

## Golden rules for agents

1. **Never pass `confirm:true` unless the user explicitly approved that exact
   trade.** Call once WITHOUT confirm → show the dry-run preview → ask → re-call
   with `confirm:true`.
2. Per-order cap `POLYMARKET_MAX_BET_USD` (default $25) and optional session cap
   are enforced server-side; don't try to split orders to sneak past them. The
   optional `POLYMARKET_MAX_FUND_USD` bounds a single `fund` call the same way.
   A `withdraw` preview marks any `to_address` that is not the user's own agent
   wallet as `CUSTOM` — show the user that line verbatim before confirming.
3. On ANY error, read the message — it says exactly what to do next (fund,
   approve, region, re-run setup). Don't retry blindly.

## End-to-end flow

```
# 0. No Polymarket account or API keys needed — the MCP bootstraps everything
#    from the user's own wallet on first setup. (Geoblock is already handled:
#    CLOB traffic routes through BlockRun's Finland egress by default. Set
#    POLYMARKET_CLOB_HOST only to use your own egress, or to hit Polymarket
#    directly from a permitted region.)

# 1. Provision + inspect (idempotent, safe to re-run any time)
blockrun_polymarket action:"setup"
# → deposit wallet address + funding instructions + region status

# 2. Fund the vault from the user's Base USDC — gasless x402, one call ($0.01 fee,
#    non-custodial). pUSD credit is ASYNC (minutes) — re-run setup to watch it. Min $2.
blockrun_polymarket action:"fund" amount_usd:5             # dry-run preview
blockrun_polymarket action:"fund" amount_usd:5 confirm:true

# 3. Sign the one-time gasless approval batch (after user consent)
blockrun_polymarket action:"setup" confirm:true

# 4. Find a market, then resolve the selected condition (paid data)
blockrun_markets path:"markets/search" params:{q:"Bitcoin",status:"open",venue:"polymarket",limit:"20"}
blockrun_markets path:"polymarket/markets/keyset" params:{condition_id:"0x...",status:"open",limit:"5"}

# 5. Preview, then place
blockrun_polymarket_read action:"preview" side:"buy" token_id:"..." amount_usd:5 order_type:"FOK"
blockrun_polymarket action:"buy" token_id:"..." amount_usd:5 order_type:"FOK" confirm:true
#   or limit: price:0.45 size:10 (GTC; order_type:"GTD" + expires_at for expiry)
#   or via condition: condition_id:"0x..." outcome:"Yes"

# 6. Manage
blockrun_polymarket_read action:"orders"                # open orders
blockrun_polymarket action:"cancel" order_id:"..."      # or all:true
blockrun_polymarket_read action:"positions"             # holdings + PnL + redeemable

# 7. Claim winnings after resolution (gasless)
blockrun_polymarket action:"redeem" condition_id:"0x..."             # preview
blockrun_polymarket action:"redeem" condition_id:"0x..." confirm:true

# 8. Cash out — pUSD → native USDC on Base, back to the user's agent wallet
blockrun_polymarket action:"withdraw"                                # dry-run (full balance)
blockrun_polymarket action:"withdraw" confirm:true                   # (partial: amount_usd:5)
```

## Order semantics

- Prices are probabilities 0–1, auto-rounded to the market's tick grid.
- A market-order preview states `worst fill ≤ X` (buy) / `≥ X` (sell); the
  order is signed at that bound, so quote it to the user as the price limit.
- Market **buy** = `amount_usd` (dollars). Market **sell** = `size` (shares).
- Limit orders: `price` + `size`; default GTC; `post_only:true` for maker-only.
- FOK fails whole-or-nothing; FAK fills what it can. On "FOK not filled", offer
  FAK or a limit at the shown book price.

## Regions / geoblock

Order placement is IP-geoblocked (US/UK/EU + many regions). **Handled by
default** — CLOB traffic routes through BlockRun's Finland egress, so `setup`
reports `✅ Region: order placement permitted` out of the box; you don't need to
do anything. A user can override by pointing `POLYMARKET_CLOB_HOST` at their
own relay (or at Polymarket directly, from a permitted region), optionally
reached through their own proxy via `POLYMARKET_CLOB_PROXY` / `HTTPS_PROXY`
(`POLYMARKET_CLOB_PROXY` wins if both are set). A proxy alone does NOT change
the Polymarket-facing egress — CLOB traffic still exits from BlockRun's Finland
relay unless `POLYMARKET_CLOB_HOST` is also repointed. Respecting Polymarket's ToS for the
user's jurisdiction is the user's responsibility — never suggest evading it.

## Troubleshooting

- "No deposit wallet configured" → run `action:"setup"`.
- No manual creds are ever needed — the MCP bootstraps its builder key from the
  user's own wallet on first `setup`. (Advanced: `POLYMARKET_SIG_TYPE=0` = plain
  EOA mode; needs POL gas + pUSD in the EOA. The CLOB may reject plain-EOA
  makers on order placement — treat it as a diagnostic fallback, not a
  guaranteed trading mode.)
- Balance/allowance errors on a buy → the buy path auto-refreshes the CLOB's
  balance cache and retries once; if it still fails, the vault genuinely lacks
  pUSD or approvals — fund it, then `action:"setup" confirm:true`.
- A **neg-risk market** buy (multi-outcome "winner" markets) fails though setup
  shows ready → a deposit wallet created before the pUSD→NegRisk Adapter approval
  was added needs ONE more `action:"setup" confirm:true` to grant it (setup reads
  approvals on-chain every run, so it detects and signs the missing one).
- A **redeem reverts** → same self-heal: wallets set up before 2026-07 lack the
  collateral-adapter approvals redeem now pulls tokens through — one
  `action:"setup" confirm:true` grants them.
- 403 → region issue; see setup's region line.
- "order signer address has to be the address of the API KEY" → auto-recovered
  once (creds re-derived); if persistent, `setup`, then as a last resort
  `POLYMARKET_SIG_TYPE=0` (upstream clob-client-v2 issue #65; see the EOA-mode
  caveat above).