> ## Documentation Index > Fetch the complete documentation index at: https://docs.interchange.io/llms.txt > Use this file to discover all available pages before exploring further. # Create or dry-run a signal for an ad server source > Create a complete signal mapping on the upstream ad-server tenant. Set dry_run=true to validate and preview without persisting. ## OpenAPI ````yaml /v2/storefront-api-v2.yaml post /esa/{esaId}/signals openapi: 3.0.0 info: title: Scope3 Storefront API version: 2.0.0 description: |- REST API for partners to manage storefronts, inventory sources, and billing. ## Authentication All endpoints require a Bearer token in the Authorization header: ``` Authorization: Bearer your-api-key ``` ## Base URL `https://api.interchange.io/api/v2/storefront` ## For AI Agents AI agents can use the MCP endpoint at `/mcp/v2/storefront` with three tools: - `initialize`: Start an MCP session - `api_call`: Make REST API calls - `ask_about_capability`: Learn about API features servers: - url: https://api.interchange.io/api/v2/storefront description: Production server security: [] tags: - name: Account description: Account management, service tokens, and preferences - name: Asks description: >- What you are waiting on Scope3 for — support, product, and supply asks in one list - name: Storefront description: Manage storefront and inventory sources - name: Storefront Agents description: List and manage registered sales, signals, and outcomes agents - name: Storefront Activity description: Audit log of configuration and inventory changes on the storefront - name: Storefront Billing description: Payout bank details and billing configuration for storefronts - name: AI Usage description: Storefront AI token usage visibility by model - name: MCP description: Model Context Protocol endpoints paths: /esa/{esaId}/signals: post: tags: - Storefront Ad Server Catalog summary: Create or dry-run a signal for an ad server source description: >- Create a complete signal mapping on the upstream ad-server tenant. Set dry_run=true to validate and preview without persisting. operationId: createEsaSignal parameters: - in: query name: dry_run schema: description: Validate and preview the upstream signal without persisting it. type: string enum: - 'true' description: Validate and preview the upstream signal without persisting it. - in: path name: esaId schema: description: >- Ad server source connection id. The wire field remains `esaId` for API compatibility. example: 123 type: integer maximum: 9007199254740991 minimum: 1 required: true description: >- Ad server source connection id. The wire field remains `esaId` for API compatibility. requestBody: required: true content: application/json: schema: type: object properties: signalId: type: string pattern: ^[A-Za-z0-9_-]+$ name: type: string minLength: 1 valueType: type: string enum: - binary - categorical - numeric adapterConfig: type: object additionalProperties: {} description: nullable: true type: string categories: type: array items: type: string range: nullable: true type: object properties: min: nullable: true anyOf: - type: number - type: string max: nullable: true anyOf: - type: number - type: string additionalProperties: {} targetingDimension: nullable: true type: string signalType: type: string enum: - generic - property - age ageDetermination: type: string enum: - survey_based - assumptive - user_provided - user_verified dataProvider: nullable: true type: string tags: type: array items: type: string pricing_options: type: array items: $ref: '#/components/schemas/VendorPricingOption' required: - signalId - name - valueType - adapterConfig additionalProperties: {} responses: '200': description: Dry-run validation result when dry_run=true. content: application/json: schema: $ref: '#/components/schemas/EsaSignalResponse' '201': description: Create or dry-run a signal for an ad server source content: application/json: schema: $ref: '#/components/schemas/EsaSignalResponse' '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - bearerAuth: [] components: schemas: VendorPricingOption: description: >- AdCP vendor pricing option. A signal carries zero or more; absence means the signal is free. Forwarded verbatim to the managed ad-server source. allOf: - type: object properties: pricing_option_id: type: string applies_to_output_format_ids: type: array items: {} required: - pricing_option_id additionalProperties: {} - oneOf: - type: object properties: model: type: string enum: - cpm cpm: type: number currency: type: string required: - model - cpm - currency additionalProperties: {} - type: object properties: model: type: string enum: - percent_of_media percent: type: number max_cpm: type: number currency: type: string required: - model - percent - currency additionalProperties: {} - type: object properties: model: type: string enum: - flat_fee amount: type: number period: type: string enum: - monthly - quarterly - annual - campaign currency: type: string required: - model - amount - period - currency additionalProperties: {} - type: object properties: model: type: string enum: - per_unit unit: type: string unit_price: type: number currency: type: string required: - model - unit - unit_price - currency additionalProperties: {} - type: object properties: model: type: string enum: - custom description: type: string currency: type: string required: - model - description additionalProperties: {} type: object EsaSignalResponse: type: object additionalProperties: {} ErrorResponse: description: Standard error response type: object properties: data: type: string nullable: true enum: - null error: $ref: '#/components/schemas/ApiError' required: - data - error additionalProperties: false ApiError: description: Structured error object type: object properties: code: description: Machine-readable error code type: string message: description: Human-readable error message type: string field: description: Field path associated with the error type: string details: description: Additional error context type: object additionalProperties: {} required: - code - message additionalProperties: false securitySchemes: bearerAuth: type: http scheme: bearer description: API key or access token ````