REST API

All requests go to the base URL: https://exchange.jamesxu.dev A machine-readable OpenAPI schema and Swagger UI are also available:

https://exchange.jamesxu.dev/api-doc/openapi.json
https://exchange.jamesxu.dev/docs

Public endpoints

No authentication required.

Method	Path	Purpose
`GET`	`/health`	Service and persistence health
`GET`	`/api/v1/markets`	List configured markets

GET /health

Returns the service status and current persistence state. No authentication required.Response fields

status

string

required

ok when persistence is disabled or ok. degraded when persistence is retrying, backpressured, or stopped.

service

string

required

Always exchange.

now

string

required

Current server time in RFC 3339 format.

persistence

object

required

Current persistence status including mode.

curl https://exchange.jamesxu.dev/health

{
  "status": "ok",
  "service": "exchange",
  "now": "2026-03-18T15:27:00.000000Z",
  "persistence": {
    "backend": "in_memory",
    "mode": "disabled",
    "queue_depth": 0,
    "last_error": null
  }
}

GET /api/v1/markets

Returns the list of all configured markets. No authentication required.

curl https://exchange.jamesxu.dev/api/v1/markets

[
  {
    "market_id": "BTC-USD",
    "display_name": "Bitcoin",
    "base_asset": "BTC",
    "quote_asset": "USD",
    "tick_size": 1,
    "min_order_quantity": 1,
    "reference_price": 100,
    "settlement_price": null,
    "status": "enabled",
    "created_at": "2026-03-18T15:00:00.000000Z",
    "updated_at": "2026-03-18T15:00:00.000000Z"
  }
]

Trader endpoints
Admin endpoints

Trader routes require the x-api-key header. API keys are provisioned by an admin and are prefixed with exch_.

x-api-key: exch_1d4208be6fa84b8cb0a2e5cfa9508d5f

Method	Path	Purpose
`GET`	`/api/v1/user`	Authenticated user profile
`GET`	`/api/v1/positions`	User positions across markets
`GET`	`/api/v1/portfolio`	Portfolio snapshot with PnL
`GET`	`/api/v1/leaderboard`	Leaderboard ranked by marked net PnL
`GET`	`/api/v1/open-orders`	Open orders, optional `?market=` filter
`GET`	`/api/v1/fills`	Fills, optional `?market=` filter
`POST`	`/api/v1/orders`	Submit a limit order
`PATCH`	`/api/v1/orders/{order_id}`	Amend remaining quantity
`DELETE`	`/api/v1/orders/{order_id}`	Cancel an order

GET /api/v1/user

Returns the authenticated trader’s profile.

curl \
  -H "x-api-key: YOUR_API_KEY" \
  https://exchange.jamesxu.dev/api/v1/user

{
  "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
  "username": "team-alpha",
  "api_key": "exch_1d4208be6fa84b8cb0a2e5cfa9508d5f",
  "created_at": "2026-03-18T15:27:42.159901Z"
}

GET /api/v1/positions

Returns all open positions for the authenticated trader.

curl \
  -H "x-api-key: YOUR_API_KEY" \
  https://exchange.jamesxu.dev/api/v1/positions

[
  {
    "market": "BTC-USD",
    "net_quantity": 5,
    "average_entry_price": 98,
    "realized_pnl": 50,
    "updated_at": "2026-03-18T15:30:00.000000Z"
  }
]

net_quantity is a signed integer. Positive values are long, negative values are short.
realized_pnl accumulates as fills close or reduce the position.

GET /api/v1/portfolio

Returns a portfolio snapshot including position limit and all current positions.

curl \
  -H "x-api-key: YOUR_API_KEY" \
  https://exchange.jamesxu.dev/api/v1/portfolio

{
  "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
  "position_limit": 1000,
  "positions": [
    {
      "market": "BTC-USD",
      "net_quantity": 5,
      "average_entry_price": 98,
      "realized_pnl": 50,
      "updated_at": "2026-03-18T15:30:00.000000Z"
    }
  ]
}

position_limit reflects the exchange-wide per-market net position limit of +/-1000.

GET /api/v1/leaderboard

Returns traders ranked by their current marked net PnL. Marking uses settled prices, orderbook mid prices, or market reference prices.Query parameters

query.limit

number

Optional. Maximum number of rows to return. Omit to return all traders.

curl \
  -H "x-api-key: YOUR_API_KEY" \
  "https://exchange.jamesxu.dev/api/v1/leaderboard?limit=10"

[
  {
    "rank": 1,
    "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
    "username": "team-alpha",
    "net_pnl": 420,
    "realized_pnl": 300,
    "unrealized_pnl": 120,
    "gross_exposure": 1000
  }
]

GET /api/v1/open-orders

Returns all resting open orders for the authenticated trader. Filter by market using the optional market query parameter.Query parameters

query.market

string

Optional. Filter results to a single market, e.g. BTC-USD.

curl \
  -H "x-api-key: YOUR_API_KEY" \
  "https://exchange.jamesxu.dev/api/v1/open-orders?market=BTC-USD"

[
  {
    "id": "66377526-7b98-485a-8c40-7024e68fa3c5",
    "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
    "market": "BTC-USD",
    "side": "BUY",
    "price": 100,
    "quantity": 2,
    "remaining": 2,
    "created_at": "2026-03-18T15:28:01.342510Z"
  }
]

GET /api/v1/fills

Returns all fills for the authenticated trader. Filter by market using the optional market query parameter.Query parameters

query.market

string

Optional. Filter results to a single market, e.g. BTC-USD.

curl \
  -H "x-api-key: YOUR_API_KEY" \
  "https://exchange.jamesxu.dev/api/v1/fills?market=BTC-USD"

[
  {
    "fill_id": "a1b2c3d4-0000-0000-0000-000000000001",
    "market": "BTC-USD",
    "maker_order_id": "aaa00000-0000-0000-0000-000000000001",
    "taker_order_id": "66377526-7b98-485a-8c40-7024e68fa3c5",
    "price": 100,
    "quantity": 2,
    "occurred_at": "2026-03-18T15:29:10.000000Z"
  }
]

POST /api/v1/orders

Submits a limit order. Returns the order, any fills that occurred, and whether the order is resting in the book.Request body

body.market

string

required

Market symbol, e.g. BTC-USD. Must follow the BASE-QUOTE format.

body.side

string

required

BUY or SELL.

body.price

number

required

Limit price. Must be greater than zero and align to the market’s tick_size.

body.quantity

number

required

Order quantity. Must be at least the market’s min_order_quantity.

Response fields

order

object

required

The submitted order with its assigned id and current remaining quantity.

fills

array

required

List of fills that occurred immediately on submission. Empty if the order rested.

resting

boolean

required

true if the order has remaining quantity in the book after matching.

curl \
  -X POST \
  -H "x-api-key: YOUR_API_KEY" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/orders \
  -d '{"market":"BTC-USD","side":"BUY","price":100,"quantity":2}'

{
  "order": {
    "id": "66377526-7b98-485a-8c40-7024e68fa3c5",
    "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
    "market": "BTC-USD",
    "side": "BUY",
    "price": 100,
    "quantity": 2,
    "remaining": 2,
    "created_at": "2026-03-18T15:28:01.342510Z"
  },
  "fills": [],
  "resting": true
}

Order admission checks worst-case net exposure from all resting open orders. A position limit of +/-1000 applies per market. Exceeding this returns 409 Conflict.

PATCH /api/v1/orders/{order_id}

Amends the remaining quantity of a resting order. You can only reduce remaining — increasing it is not allowed.Path parameters

path.order_id

string

required

UUID of the resting order to amend.

Request body

body.remaining

number

required

New remaining quantity. Must be greater than zero and less than or equal to the current remaining.

curl \
  -X PATCH \
  -H "x-api-key: YOUR_API_KEY" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/orders/ORDER_ID \
  -d '{"remaining":1}'

{
  "order": {
    "id": "66377526-7b98-485a-8c40-7024e68fa3c5",
    "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
    "market": "BTC-USD",
    "side": "BUY",
    "price": 100,
    "quantity": 2,
    "remaining": 1,
    "created_at": "2026-03-18T15:28:01.342510Z"
  }
}

DELETE /api/v1/orders/{order_id}

Cancels a resting order. Returns the canceled order.Path parameters

path.order_id

string

required

UUID of the order to cancel.

curl \
  -X DELETE \
  -H "x-api-key: YOUR_API_KEY" \
  https://exchange.jamesxu.dev/api/v1/orders/ORDER_ID

{
  "order": {
    "id": "66377526-7b98-485a-8c40-7024e68fa3c5",
    "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
    "market": "BTC-USD",
    "side": "BUY",
    "price": 100,
    "quantity": 2,
    "remaining": 2,
    "created_at": "2026-03-18T15:28:01.342510Z"
  }
}

Admin routes require a Bearer token in the Authorization header.

Authorization: Bearer ADMIN_API_TOKEN

Method	Path	Purpose
`POST`	`/api/v1/admin/users`	Provision a competition user
`GET`	`/api/v1/admin/state`	Current controls, markets, messages, and persistence
`POST`	`/api/v1/admin/trading/start`	Enable trading submissions
`POST`	`/api/v1/admin/trading/stop`	Disable trading submissions
`GET`	`/api/v1/admin/markets`	List markets
`POST`	`/api/v1/admin/markets`	Create or replace a market
`PATCH`	`/api/v1/admin/markets/{market_id}`	Update market status or limits
`DELETE`	`/api/v1/admin/markets/{market_id}`	Delete a market with no open orders
`POST`	`/api/v1/admin/markets/{market_id}/settle`	Settle a market at a given price
`POST`	`/api/v1/admin/config/load`	Bulk-load exchange config and market definitions
`GET`	`/api/v1/admin/messages`	Recent admin messages
`POST`	`/api/v1/admin/messages`	Send a broadcast or user-targeted admin message
`POST`	`/api/v1/admin/users/reset`	Clear all user positions, orders, and fills
`GET`	`/api/v1/admin/leaderboard`	Leaderboard snapshot

POST /api/v1/admin/users

Provisions a new competition user and returns their profile including the assigned API key.Request body

body.username

string

required

Unique username for the new trader. Must not be empty.

Response fields

profile

object

required

Show properties

trader_id

string

UUID assigned to the trader.

username

string

The provisioned username.

api_key

string

API key prefixed with exch_. Share this with the trader.

created_at

string

ISO 8601 creation timestamp.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/admin/users \
  -d '{"username":"team-alpha"}'

{
  "profile": {
    "trader_id": "9d64e278-8b56-46e9-9cab-18c5b22f2fb9",
    "username": "team-alpha",
    "api_key": "exch_1d4208be6fa84b8cb0a2e5cfa9508d5f",
    "created_at": "2026-03-18T15:27:42.159901Z"
  }
}

GET /api/v1/admin/state

Returns the current exchange state including trading controls, configured markets, recent admin messages (up to 50), and persistence status.

curl \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  https://exchange.jamesxu.dev/api/v1/admin/state

Response fields: controls (ExchangeControls), markets (array of MarketDefinition), recent_messages (up to 50 AdminMessageEntry), persistence (PersistenceStatus).

POST /api/v1/admin/trading/start

Enables order submissions exchange-wide. Traders can submit orders once this is set.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  https://exchange.jamesxu.dev/api/v1/admin/trading/start

POST /api/v1/admin/trading/stop

Disables order submissions exchange-wide. All new order, amend, and cancel requests will be rejected until trading is re-enabled.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  https://exchange.jamesxu.dev/api/v1/admin/trading/stop

GET /api/v1/admin/markets

Returns all configured markets including full metadata and status.

curl \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  https://exchange.jamesxu.dev/api/v1/admin/markets

POST /api/v1/admin/markets

Creates or replaces a market definition. If a market with the same market_id already exists, it is replaced.Request body

body.market_id

string

required

Market symbol in BASE-QUOTE format, e.g. BTC-USD.

body.display_name

string

Optional. Human-readable market name. Falls back to market_id if omitted.

body.base_asset

string

required

Base asset symbol.

body.quote_asset

string

required

Quote asset symbol.

body.tick_size

number

required

Minimum price increment. All order prices must be a multiple of this value.

body.min_order_quantity

number

required

Minimum order quantity. Orders below this are rejected.

body.reference_price

number

Optional reference price used for marking when no trades have occurred.

body.enabled

boolean

required

Whether the market is open for trading on creation. true creates an enabled market, false creates a disabled one.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/admin/markets \
  -d '{
    "market_id":"BTC-USD",
    "display_name":"Bitcoin",
    "base_asset":"BTC",
    "quote_asset":"USD",
    "tick_size":1,
    "min_order_quantity":1,
    "reference_price":100,
    "enabled":true
  }'

PATCH /api/v1/admin/markets/{market_id}

Updates a market’s status or limits. Only fields provided in the request body are changed.Path parameters

path.market_id

string

required

Market symbol, e.g. BTC-USD.

curl \
  -X PATCH \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/admin/markets/BTC-USD \
  -d '{"enabled":false}'

DELETE /api/v1/admin/markets/{market_id}

Deletes a market. The market must have no open orders.Path parameters

path.market_id

string

required

Market symbol to delete.

curl \
  -X DELETE \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  https://exchange.jamesxu.dev/api/v1/admin/markets/BTC-USD

POST /api/v1/admin/markets/{market_id}/settle

Settles a market. Cancels all resting orders, then closes every trader’s net position at the supplied settlement price, realizing PnL. Positions are flattened to zero after settlement.Path parameters

path.market_id

string

required

Market symbol to settle.

Request body

body.settlement_price

number

required

The admin-determined true value per share. PnL is realized against each trader’s signed net position at this price. Must be greater than zero.

body.announcement

string

Optional. Custom announcement text broadcast to all WebSocket clients after settlement. Defaults to a generated message if omitted.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/admin/markets/BTC-USD/settle \
  -d '{"settlement_price":150}'

{
  "market": {
    "market_id": "BTC-USD",
    "status": "settled",
    "settlement_price": 150
  },
  "canceled_orders": 5,
  "affected_traders": 3,
  "settled_quantity": 200,
  "settlement_price": 150
}

POST /api/v1/admin/config/load

Bulk-loads exchange configuration and market definitions. Use this to initialize or replace the full exchange state in one call.Request body

body.trading_enabled

boolean

Optional. Set to true or false to control trading. Omit to leave the current value unchanged.

body.markets

array

required

Array of market definitions. Each entry uses the same shape as POST /api/v1/admin/markets.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/admin/config/load \
  -d '{"markets":[{"market_id":"BTC-USD","display_name":"Bitcoin","base_asset":"BTC","quote_asset":"USD","tick_size":1,"min_order_quantity":1,"reference_price":100,"enabled":true}]}'

GET /api/v1/admin/messages

Returns recent admin messages sent to traders.Query parameters

query.limit

number

Optional. Maximum number of messages to return. Defaults to 50.

curl \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  "https://exchange.jamesxu.dev/api/v1/admin/messages?limit=20"

POST /api/v1/admin/messages

Sends a broadcast or user-targeted admin message. Messages can be scoped to all traders or a specific username.Request body

body.target_username

string

Optional. Username to send the message to. null broadcasts to all traders.

body.market

string

Optional. Market context for the message.

body.level

string

required

Severity level: info, warning, or critical.

body.title

string

Optional. Short message title.

body.body

string

required

Full message body.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  -H "content-type: application/json" \
  https://exchange.jamesxu.dev/api/v1/admin/messages \
  -d '{
    "target_username": null,
    "market": "BTC-USD",
    "level": "info",
    "title": "Desk notice",
    "body": "Trading will stop in five minutes."
  }'

POST /api/v1/admin/users/reset

Clears all user positions, open orders, and fills exchange-wide. This is a destructive operation intended for resetting between competition rounds.

This operation is irreversible. All trader positions, open orders, and fills are permanently deleted.

curl \
  -X POST \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  https://exchange.jamesxu.dev/api/v1/admin/users/reset

{
  "cleared_orders": 12,
  "cleared_positions": 8,
  "cleared_fills": 34
}

GET /api/v1/admin/leaderboard

Returns a leaderboard snapshot with all traders ranked by marked net PnL. Useful for competition scoring and monitoring.Query parameters

query.limit

number

Optional. Maximum number of rows to return. Omit to return all traders.

curl \
  -H "Authorization: Bearer ADMIN_API_TOKEN" \
  "https://exchange.jamesxu.dev/api/v1/admin/leaderboard?limit=20"

Data model notes

side is BUY or SELL
price, quantity, and remaining are unsigned 64-bit integers (u64)
The per-market net position limit is +/-1000
Traders can sell from flat and go short; order admission is based on worst-case net exposure if all resting open orders were to execute
Realized PnL is tracked on positions; no pre-seeded inventory or cash balance is required to open a long or short position
Leaderboard ranking uses settled prices, orderbook marks, or market reference prices
Pagination is not yet implemented

Get Started

Authentication

WebSocket API

Operator Guide

Examples

REST API

Public endpoints

Data model notes

Build docs developers (and LLMs) love

Get Started

Authentication

REST API

WebSocket API

Operator Guide

Examples

​Public endpoints

​Data model notes

Build docs developers (and LLMs) love

Public endpoints

Data model notes