> ## Documentation Index > Fetch the complete documentation index at: https://developers.circle.com/llms.txt > Use this file to discover all available pages before exploring further. # Create a new wallet set > Creates a new developer-controlled wallet set. **Note:** A developer account can create up to 1,000 wallet sets, with each set supporting up to 10 million wallets. To ensure EVM wallets are created with the same address across chains, see [Unified Wallet Addressing on EVM Chains](/w3s/unified-wallet-addressing-evm). ## OpenAPI ````yaml openapi/developer-controlled-wallets.yaml post /v1/w3s/developer/walletSets openapi: 3.0.3 info: version: '1.0' title: Developer-Controlled Wallets description: Developer-Controlled Wallets API documentation. servers: - url: https://api.circle.com security: - BearerAuth: [] tags: - name: Wallet Sets - name: Wallets - name: Signing - name: Transactions - name: Token Lookup paths: /v1/w3s/developer/walletSets: post: tags: - Wallet Sets summary: Create a new wallet set description: > Creates a new developer-controlled wallet set. **Note:** A developer account can create up to 1,000 wallet sets, with each set supporting up to 10 million wallets. To ensure EVM wallets are created with the same address across chains, see [Unified Wallet Addressing on EVM Chains](/w3s/unified-wallet-addressing-evm). operationId: createWalletSet parameters: - $ref: '#/components/parameters/XRequestId' requestBody: $ref: '#/components/requestBodies/CreateWalletSet' responses: '200': description: Wallet set already exists. content: application/json: schema: $ref: '#/components/schemas/WalletSetResponse' headers: X-Request-Id: $ref: '#/components/headers/XRequestId' '201': description: Successfully created wallet set. content: application/json: schema: $ref: '#/components/schemas/WalletSetResponse' headers: X-Request-Id: $ref: '#/components/headers/XRequestId' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/NotAuthorized' security: - BearerAuth: [] components: parameters: XRequestId: name: X-Request-Id in: header description: > Developer-provided identifier for this request, used for tracing requests in Wallets API logs and the Developer Console, and when communicating with Circle Support. **Must be a UUID to appear in logs.** Non-UUID values are accepted by the API but are ignored by logging and tracing systems. schema: $ref: '#/components/schemas/XRequestId' requestBodies: CreateWalletSet: content: application/json: schema: type: object required: - entitySecretCiphertext - idempotencyKey properties: entitySecretCiphertext: $ref: '#/components/schemas/EntitySecretCiphertext' idempotencyKey: $ref: '#/components/schemas/IdempotencyKey' name: $ref: '#/components/schemas/Name' required: true description: Schema for the request payload to create a new wallet set. schemas: WalletSetResponse: title: WalletSetResponse type: object required: - data properties: data: type: object required: - walletSet properties: walletSet: oneOf: - $ref: '#/components/schemas/DeveloperWalletSet' - $ref: '#/components/schemas/EndUserWalletSet' discriminator: propertyName: custodyType XRequestId: type: string format: uuid description: >- A unique identifier, which can be helpful for identifying a request when communicating with Circle support. example: 2adba88e-9d63-44bc-b975-9b6ae3440dde EntitySecretCiphertext: type: string description: > A base64 string expression of the entity secret ciphertext. The entity secret should be encrypted by the entity public key. Circle mandates that the entity secret ciphertext is unique for each API request. format: byte example: >- 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 IdempotencyKey: type: string description: >- Universally unique identifier (UUID v4) idempotency key. This key is utilized to ensure exactly-once execution of mutating requests. To create a UUIDv4 go to [uuidgenerator.net](https://www.uuidgenerator.net). If the same key is reused, it will be treated as the same request and the original response will be returned. example: a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11 format: uuid Name: type: string description: Name or description associated with the wallet or walletSet. DeveloperWalletSet: allOf: - $ref: '#/components/schemas/WalletSet' - type: object required: - custodyType properties: custodyType: type: string enum: - DEVELOPER EndUserWalletSet: allOf: - $ref: '#/components/schemas/WalletSet' - type: object required: - custodyType - userId properties: custodyType: type: string enum: - ENDUSER userId: $ref: '#/components/schemas/ExternalUserId' WalletSet: type: object required: - id - custodyType - createDate - updateDate properties: id: $ref: '#/components/schemas/Id' createDate: $ref: '#/components/schemas/CreateDate' updateDate: $ref: '#/components/schemas/UpdateDate' ExternalUserId: type: string description: Unique system generated identifier for the user. example: ext_user_id_1 maxLength: 50 minLength: 5 Id: type: string format: uuid description: System-generated unique identifier of the resource. example: c4d1da72-111e-4d52-bdbf-2e74a2d803d5 CreateDate: type: string format: date-time description: Date and time the resource was created, in ISO-8601 UTC format. example: '2023-01-01T12:04:05Z' UpdateDate: type: string format: date-time description: Date and time the resource was last updated, in ISO-8601 UTC format. example: '2023-01-01T12:04:05Z' headers: XRequestId: description: > Developer-provided header parameter or Circle-generated universally unique identifier (UUID v4). Useful for identifying a specific request when communicating with Circle Support. schema: $ref: '#/components/schemas/XRequestId' responses: BadRequest: content: application/json: schema: type: object title: BadRequestResponse required: - code - message properties: code: type: integer description: Code that corresponds to the error. message: type: string description: Message that describes the error. example: code: 400 message: Bad request. description: Request cannot be processed due to a client error. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' NotAuthorized: content: application/json: schema: type: object title: NotAuthorizedResponse required: - code - message properties: code: type: integer description: Code that corresponds to the error. message: type: string description: Message that describes the error. example: code: 401 message: Malformed authorization. description: >- Request has not been applied because it lacks valid authentication credentials. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: PREFIX:ID:SECRET description: >- Circle's API Keys are formatted in the following structure "PREFIX:ID:SECRET". All three parts are required to make a successful request. ````