> ## Documentation Index > Fetch the complete documentation index at: https://docs.kalshi.com/llms.txt > Use this file to discover all available pages before exploring further. # Create API Key > Endpoint for creating a new API key with a user-provided public key. This endpoint allows users with Premier or Market Maker API usage levels to create API keys by providing their own RSA or Ed25519 public key in PEM format. The platform will use this public key to verify signatures on API requests: RSA-PSS with SHA-256 for RSA keys, Ed25519 for Ed25519 keys. ## OpenAPI ````yaml /openapi.yaml post /api_keys openapi: 3.0.0 info: title: Kalshi Trade API Manual Endpoints version: 3.34.0 description: >- Manually defined OpenAPI spec for endpoints being migrated to spec-first approach servers: - url: https://external-api.kalshi.com/trade-api/v2 description: Production Trade API server - url: https://api.elections.kalshi.com/trade-api/v2 description: Production shared API server, also supported - url: https://external-api.demo.kalshi.co/trade-api/v2 description: Demo Trade API server - url: https://demo-api.kalshi.co/trade-api/v2 description: Demo shared API server, also supported security: [] tags: - name: api-keys description: API key management endpoints - name: orders description: Order management endpoints - name: order-groups description: Order group management endpoints - name: portfolio description: Portfolio and balance information endpoints - name: communications description: Request-for-quote (RFQ) endpoints - name: multivariate description: Multivariate event collection endpoints - name: exchange description: Exchange status and information endpoints - name: live-data description: Live data endpoints - name: markets description: Market data endpoints - name: milestone description: Milestone endpoints - name: search description: Search and filtering endpoints - name: incentive-programs description: Incentive program endpoints - name: fcm description: FCM member specific endpoints - name: events description: Event endpoints - name: structured-targets description: Structured targets endpoints paths: /api_keys: post: tags: - api-keys summary: Create API Key description: ' Endpoint for creating a new API key with a user-provided public key. This endpoint allows users with Premier or Market Maker API usage levels to create API keys by providing their own RSA or Ed25519 public key in PEM format. The platform will use this public key to verify signatures on API requests: RSA-PSS with SHA-256 for RSA keys, Ed25519 for Ed25519 keys.' operationId: CreateApiKey requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateApiKeyRequest' responses: '201': description: API key created successfully content: application/json: schema: $ref: '#/components/schemas/CreateApiKeyResponse' '400': description: Bad request - invalid input '401': description: Unauthorized '403': description: >- Forbidden - insufficient API usage level, or fcm_subtrader_id from a non-FCM caller '409': description: >- Conflict - the bound FCM subtrader is not yet visible in the credential registry; retry after the subtrader create propagates '500': description: Internal server error security: - kalshiAccessKey: [] kalshiAccessSignature: [] kalshiAccessTimestamp: [] components: schemas: CreateApiKeyRequest: type: object required: - name - public_key properties: name: type: string description: Name for the API key. This helps identify the key's purpose public_key: type: string description: >- RSA or Ed25519 public key in PEM format (`-----BEGIN PUBLIC KEY-----`). This will be used to verify signatures on API requests - RSA-PSS with SHA-256 for RSA keys, Ed25519 for Ed25519 keys scopes: type: array description: >- List of scopes to grant to the API key. If the broad `write` parent scope is included, `read` must also be included. Child scopes may be granted without the broad parent scope. Defaults to full access (`read`, `write`) if not provided. items: $ref: '#/components/schemas/ApiKeyScope' subaccount: type: integer minimum: 0 maximum: 63 description: >- If set, restricts the API key to a single sub-account (0-63) that you own. A restricted key may only read and trade on that sub-account; it cannot act on other sub-accounts, transfer funds between sub-accounts, or create sub-accounts. Omit to leave the key unrestricted. Mutually exclusive with fcm_subtrader_id. fcm_subtrader_id: type: string description: >- FCM members only. If set, binds the API key to a single FCM subtrader that you own, spelled {your_user_id}_{suffix} with a suffix of 1-16 case-sensitive ASCII alphanumeric characters. The subtrader must already exist. A bound key is the institution's trading credential for that subtrader - FIX order-entry and market-data sessions, plus margin WebSocket sessions scoped to the subtrader's own data - and is denied on every REST endpoint, including key management. Mutually exclusive with subaccount. CreateApiKeyResponse: type: object required: - api_key_id properties: api_key_id: type: string description: Unique identifier for the newly created API key warning: type: string nullable: true description: >- Present only when the minted key is bound to an FCM subtrader that is missing a per-subtrader risk control - the initial-margin cap (margin lane) or the event-contract daily cap. The mint still succeeds; the warning names each missing control - an event-contract subtrader without a daily cap has its event-contract orders rejected until one is set, while a margin subtrader without an initial-margin cap is bounded only by firm-level risk limits. ApiKeyScope: type: string enum: - read - write - read::block_trade_accept - read::portfolio_balance - write::trade - write::transfer - write::fcm_risk - write::block_trade_accept x-enum-varnames: - ApiKeyScopeRead - ApiKeyScopeWrite - ApiKeyScopeReadBlockTradeAccept - ApiKeyScopeReadPortfolioBalance - ApiKeyScopeWriteTrade - ApiKeyScopeWriteTransfer - ApiKeyScopeWriteFCMRisk - ApiKeyScopeWriteBlockTradeAccept description: >- Scope granted to an API key. Parent scopes grant broad access; for example, `read` grants all read endpoints and `write` grants all write endpoints. Child scopes such as `read::block_trade_accept`, `read::portfolio_balance`, `write::trade`, `write::transfer`, `write::fcm_risk` (FCM subtrader creation, trading blocks, daily premium caps, and margin caps), and `write::block_trade_accept` grant only their specific endpoint group and can be granted without the parent scope. securitySchemes: kalshiAccessKey: type: apiKey in: header name: KALSHI-ACCESS-KEY description: Your API key ID kalshiAccessSignature: type: apiKey in: header name: KALSHI-ACCESS-SIGNATURE description: >- Base64 signature of the pre-sign text (timestamp + method + path) made with the API key's algorithm - RSA-PSS with SHA-256 for RSA keys, Ed25519 for Ed25519 keys kalshiAccessTimestamp: type: apiKey in: header name: KALSHI-ACCESS-TIMESTAMP description: Request timestamp in milliseconds ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.