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The Trade API supports Predict.fun through the v2 surface. You use the same endpoints, credentials, HMAC signing, and idempotency contract as Polymarket — you add "venue": "predictfun" to the request body (or ?venue=predictfun on GET/DELETE routes). Omitting venue always means Polymarket, so existing integrations are unaffected.

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Two ways to select the venue

Field-based (canonical). Put "venue": "predictfun" in the body (or ?venue=predictfun on GET/DELETE). Omitting it means Polymarket — the backward-compatible default. Path-based aliases. /v2/trade/{venue}/... mirrors the venue-aware routes with the venue pinned in the path — convenient when a gateway or client keys a base path per venue:
The path is authoritative (it overrides any venue in the body). Sign the exact path you call — HMAC uses it verbatim. An unknown venue segment returns 404. Venue-neutral routes (users, combos, withdrawable balances) have no path alias. Both forms hit the same handlers and enforce the same entitlement. This page covers what is specific to Predict.fun. For the full behaviour of each order type, see the Trade API product page; for endpoint-level detail, see the Trade API reference.

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Entitlement

Predict.fun is enabled per partner. A request with venue: "predictfun" from a key that is not entitled returns VENUE_NOT_ENABLED (403). Ask your Bravado contact to enable the venue for your key.

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Supported order types

Order types not listed (PEGGED, ICEBERG, STOP_LOSS, TAKE_PROFIT, TRAILING_STOP) are not yet available on Predict.fun and return VENUE_CAPABILITY_UNSUPPORTED.

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Venue-specific behaviour

  • symbol is the on-chain outcome token id (a numeric string), not the market.
  • price is a decimal probability snapped to a 0.01 tick. time_in_force (IOC/FOK) and expiration (GTD) are not supported — orders rest GTC.
  • Minimum order value is $0.90. A smaller order is rejected; a TWAP slice below it is bumped to the minimum.
  • Fees are set by the market (feeRateBps, commonly 200 = 2%) and charged in shares on buys — a 10-share fill credits roughly 9.8 shares.
  • Order ids are numeric strings. Cancel by that id, the same way as Polymarket’s 0x hashes.
  • Balances and withdrawals are USDT on BNB Chain.

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Positions

Predict.fun positions support redeem, split, and merge, plus withdraw to an external address. Winning shares become redeemable once the market resolves; redeeming a losing position is a valid no-op that returns a zero payout. Pass "venue": "predictfun" on the positions, redeem, split, merge, and withdraw routes. See Positions for the full lifecycle.

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Not yet supported

  • Copytrade and Combos (Polymarket only).
  • Live fill streams (poll positions/activity).
  • IOC/FOK time-in-force and GTD expiration.