Changelog

Each entry names the API it changes. A change that can make a request that used to succeed fail, or that changes what an existing field means, starts with "Behavior change".

November 9, 2026Copy Anchor Link

• WebSocket API. A connection that does not finish sending its upgrade request within 30 seconds is closed.

November 6, 2026Copy Anchor Link

• WebSocket API. Behavior change. Ids in topic names must be written in their plain decimal form. A subscribe to predictOrderbook/01 or predictOrderbook/+1 is rejected. Subscribe to predictOrderbook/1 instead.

November 5, 2026Copy Anchor Link

• Docs. The developer docs moved to dev.predict.fun, with guides, a REST reference generated from the OpenAPI spec, a WebSocket reference generated from the AsyncAPI spec, and a Markdown copy of every page, indexed at /llms.txt.

October 26, 2026Copy Anchor Link

• REST API. New endpoint GET /account/{address} returns the public profile of any wallet.
• REST API. Behavior change. GET /search rejects a query longer than 256 characters with a 400. The limit was already documented.

October 20, 2026Copy Anchor Link

• REST API. New endpoint GET /account/{address}/pnl returns a wallet's profit and loss history for a period of 1d, 7d, 30d or all.
• REST API. New endpoint GET /markets/status-logs returns the on-chain status changes of up to 100 markets per call.
• REST API. Markets have a makerFeeBps field. It is 0 on every market, because no market charges makers. feeRateBps is the taker fee.
• REST API. GET /positions and GET /positions/{address} accept marketIds, a list of up to 100 market ids. It cannot be combined with marketId.
• REST API. GET /categories accepts marketVariants, a list that cannot be combined with marketVariant, and returns a totalCount when you pass includeTotalCount=true.
• REST API. GET /search accepts a limit of up to 50, up from 25.

October 15, 2026Copy Anchor Link

• REST API. Behavior change. POST /orders rejects a nonce above 2147483647, a slippage or fee rate above 10000 bps, and a signature longer than 1 KiB of hex. Orders signed with the SDKs are not affected.

October 12, 2026Copy Anchor Link

• REST API. New endpoint GET /account/{address}/activity returns the activity of any wallet.

October 5, 2026Copy Anchor Link

• REST API. New endpoints GET /series, GET /series/{slug} and GET /series/{slug}/rounds list recurring market series, such as hourly up or down markets, and their rounds. Every category and market that is a round of a series carries its seriesSlug.

September 14, 2026Copy Anchor Link

• REST API. Behavior change. GET /positions and GET /positions/{address} leave out positions in outcomes that settled as losing, as the web app does. Pass includeLost=true to list them.

September 9, 2026Copy Anchor Link

• WebSocket API. New topic predictTopOfBook/{marketId} carries a market's best bid, best ask, their sizes and the last trade. Subscribe to it instead of the full order book when you only need the touch.

September 8, 2026Copy Anchor Link

• WebSocket API. Wallet events render the outcome name in the language set with setLanguage.

August 31, 2026Copy Anchor Link

• REST API. Vietnamese, Indonesian and Korean translations. See GET /languages.

August 26, 2026Copy Anchor Link

• REST API. Behavior change. Open positions are valued at the price they could be sold for, the best bid for Yes and the complement of the best ask for No, rather than the midpoint of the book.

August 25, 2026Copy Anchor Link

• REST API. Paginated lists no longer skip rows that share a sort value across a page boundary.

August 18, 2026Copy Anchor Link

• REST API. POST /orders answers a signature without a 0x prefix with a 400 instead of a 500.

August 17, 2026Copy Anchor Link

• WebSocket API. Before the server restarts, it sends a reconnect notice so clients can reconnect before the connection closes.

August 13, 2026Copy Anchor Link

• REST API. GET /maker-rebates accepts occurred_after and occurred_before.

August 7, 2026Copy Anchor Link

• REST API. Responses carry an ETag. Send it back in If-None-Match to get a 304 with no body when nothing changed.

August 3, 2026Copy Anchor Link

• WebSocket API. Connections can negotiate permessage-deflate compression.

July 31, 2026Copy Anchor Link

• REST API. GET /orders/matches accepts orderHashes to return only the matches of the given orders.

July 28, 2026Copy Anchor Link

• REST API. Categories carry negRiskOnChainId, the on-chain id of a negative risk market.

July 15, 2026Copy Anchor Link

• REST API. POST /orders answers an invalid price with a 400 instead of a 500.

June 26, 2026Copy Anchor Link

• REST API. POST /orders returns removalLockedUntil. On up/down markets with a speed bump, an order that isn't post-only can't be removed before that time. Elsewhere it's null.

June 24, 2026Copy Anchor Link

• REST API. GET /account/activity accepts occurredAfter and occurredBefore.

June 17, 2026Copy Anchor Link

• REST API. New endpoints GET /maker-rebates and GET /referral-fees list the maker rebates and referral fees paid to your account.

June 10, 2026Copy Anchor Link

• REST API. GET /orders/matches accepts executedAfter and executedBefore.

May 20, 2026Copy Anchor Link

• REST API. New endpoint POST /orders/remove-by-hash removes orders by their hashes.

May 6, 2026Copy Anchor Link

• REST API. Categories carry a shortTitle.

April 20, 2026Copy Anchor Link

• REST API. New endpoints GET /markets/orderbooks and GET /markets/timeseries serve many markets in one call.

April 4, 2026Copy Anchor Link

• REST API. POST /orders accepts isPostOnly on LIMIT orders. A post-only order only adds liquidity. If it would match right away, it isn't placed in the book, and you get an orderNotAccepted event with the reason rejectedPostOnly. See place orders.

March 18, 2026Copy Anchor Link

• REST API. Categories carry resolutionProvider, the source that resolves their markets.

March 17, 2026Copy Anchor Link

• REST API. Market timeseries accept a resolution of 1m.