# cTrader ProtoOASpotEvent Independent and unofficial. Not affiliated with or endorsed by any broker or platform named here. Educational only: nothing here is advice, and nothing here recommends a broker or a trade. This is the markdown version of https://openbrokerapi.com/platforms/ctrader/messages/protooaspotevent, written from the same records as that page. Risk warning: CFDs and spread bets are complex instruments and come with a high risk of losing money rapidly due to leverage. You can lose money on these products, and each provider publishes its own loss figure under FCA rules. You should consider whether you understand how they work and whether you can afford to take the high risk of losing your money. Automated and API trading can amplify losses through bugs, connectivity failures and runaway orders. Carries a live price for a subscribed symbol. The first one after subscribing holds the latest prices even when the market is closed. - Message: `ProtoOASpotEvent` - Interface: cTrader Open API - Group: Live prices - Status: verified. Source: [help.ctrader.com](https://help.ctrader.com/open-api/messages/#protooaspotevent), checked 2026-10-12. - The definition file it was checked against: https://github.com/spotware/openapi-proto-messages/blob/main/OpenApiMessages.proto This is a message of the cTrader Open API, not an HTTP endpoint. It has no method and no path: it is sent over an open TCP or WebSocket connection, as Protocol Buffers or as JSON. It is in no OpenAPI file on this site and the request builder does not list it. ## The message - Name: `ProtoOASpotEvent` - Direction: Event, sent by the server - Payload type: `PROTO_OA_SPOT_EVENT`, number `2131`. This number is what identifies the message on the wire. ## Fields - `payloadType` (type ProtoOAPayloadType, optional): Identifies the message. Its default in the definition is PROTO_OA_SPOT_EVENT, which is number 2131. - `ctidTraderAccountId` (type int64, required): The account the message is about, by its cTrader account id. Responses and events carry the same id, which is how a program holding several accounts on one connection tells them apart. - `symbolId` (type int64, required): The symbol, by its id on the cTrader platform. Ids come from the symbol list. - `bid` (type uint64, optional): The bid price. As a whole number of 1/100000 of a price unit, so 123000 means 1.23. - `ask` (type uint64, optional): The ask price. As a whole number of 1/100000 of a price unit, so 123000 means 1.23. - `trendbar` (type repeated ProtoOATrendbar, optional): The bar now forming, sent where live trend bars are subscribed to as well. - `sessionClose` (type uint64, optional): The close of the last session. As a whole number of 1/100000 of a price unit, so 123000 means 1.23. - `timestamp` (type int64, optional): The time of the price, as Unix time. Sent where the subscription asked for it. ## Limits that apply at cTrader Open API - Requests a second, not historical data: 50 requests per second - Scope: Per connection, requests that are not for historical data - Status: verified. Source: [help.ctrader.com](https://help.ctrader.com/open-api/), checked 2026-10-12. - Note: Historical data requests have their own lower limit, held in a separate record. - Requests a second, historical data: 5 requests per second - Scope: Per connection, historical data requests only - Status: verified. Source: [help.ctrader.com](https://help.ctrader.com/open-api/), checked 2026-10-12. ## Related cTrader messages: Live prices - [ProtoOASubscribeLiveTrendbarReq](https://openbrokerapi.com/platforms/ctrader/messages/protooasubscribelivetrendbarreq): Subscribes to live bars of one size for one symbol. The definition says the symbol's live prices have to be subscribed to first, and the bars arrive inside ProtoOASpotEvent. - [ProtoOASubscribeLiveTrendbarRes](https://openbrokerapi.com/platforms/ctrader/messages/protooasubscribelivetrendbarres): Acknowledges the subscription to live bars. - [ProtoOASubscribeSpotsReq](https://openbrokerapi.com/platforms/ctrader/messages/protooasubscribespotsreq): Subscribes to the live prices of one or more symbols. The definition says a first ProtoOASpotEvent with the latest price follows, and then one for each price update. - [ProtoOASubscribeSpotsRes](https://openbrokerapi.com/platforms/ctrader/messages/protooasubscribespotsres): Acknowledges that the subscription has been queued. The definition says the first ProtoOASpotEvent with the current price arrives shortly after. - [ProtoOAUnsubscribeSpotsReq](https://openbrokerapi.com/platforms/ctrader/messages/protooaunsubscribespotsreq): Stops the live prices of one or more symbols. The definition suggests it as a way to cut traffic, most of all when markets are volatile. - [ProtoOAUnsubscribeSpotsRes](https://openbrokerapi.com/platforms/ctrader/messages/protooaunsubscribespotsres): Acknowledges that the request to stop live prices has been queued. The definition says a few more ProtoOASpotEvent messages can still arrive until it is done. ## More on cTrader - [All cTrader messages](https://openbrokerapi.com/platforms/ctrader/messages): 49 documented here, grouped by what they do. - [cTrader API quickstart](https://openbrokerapi.com/platforms/ctrader/quickstart) - [All cTrader error codes](https://openbrokerapi.com/errors/ctrader) - [cTrader API page](https://openbrokerapi.com/platforms/ctrader): The full record: access, authentication, limits and the source for each. ## Licence and how to cite The records behind this page are all rights reserved. This file is the page itself, at its own address, in another format. It is not part of the CC BY 4.0 downloads listed at https://openbrokerapi.com/data. Quote from it with a link to the page. Cite as: cTrader ProtoOASpotEvent. Broker API Hub, https://openbrokerapi.com/platforms/ctrader/messages/protooaspotevent, newest check 2026-10-12. Where you rely on a single figure, cite the source and the checked date printed beside it as well. Where this page and a broker's own documentation differ, the documentation wins.