> ## 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. # Sync measurement data > Inbound sync_measurement_data endpoint. Advertisers or MMPs call this to provide performance data as an alternative to CAPI. Accepts time-series measurement data keyed by campaign, media buy, package, and/or creative. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /advertisers/{advertiserId}/measurement-data/sync openapi: 3.0.0 info: title: Scope3 Buyer API version: 2.0.0 description: |- REST API for advertisers to manage advertisers, campaigns, and reporting. ## Authentication All endpoints require a Bearer token in the Authorization header: ``` Authorization: Bearer your-api-key ``` ## Base URL `https://api.interchange.io/api/v2/buyer` ## For AI Agents AI agents can use the MCP endpoint at `/mcp/v2/buyer` 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/buyer description: Production server security: [] tags: - name: Signup description: Request reviewed access to Interchange - 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: Advertisers description: Manage advertisers - name: Product Discovery description: Discover and select products - name: Campaigns description: Manage advertising campaigns - name: Creatives description: Build, manage, and sync campaign creatives via AdCP Creative Protocol - name: Reporting description: Access performance metrics - name: Event Sources description: >- Manage event source configurations and log conversion/marketing events for attribution - name: Property Lists description: Validate property lists against AAO registry - name: Sales Agents description: View and connect sales agents - name: Measurement description: Measurement sources, records, context, and freshness - name: Syndication description: Syndicate resources to ADCP agents - name: Tasks description: Track async operation status - name: Buyer Billing description: >- Consolidated invoicing for buyers — invoices and pending invoice items issued by Scope3 across the buyer customer. - name: MCP description: Model Context Protocol endpoints for AI agents paths: /advertisers/{advertiserId}/measurement-data/sync: post: tags: - Measurement summary: Sync measurement data description: >- Inbound sync_measurement_data endpoint. Advertisers or MMPs call this to provide performance data as an alternative to CAPI. Accepts time-series measurement data keyed by campaign, media buy, package, and/or creative. operationId: syncMeasurementData parameters: - in: path name: advertiserId schema: description: Unique identifier for the advertiser example: '12345' type: string minLength: 1 required: true description: Unique identifier for the advertiser requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SyncMeasurementDataRequest' responses: '200': description: Sync measurement data content: application/json: schema: $ref: '#/components/schemas/SyncMeasurementDataResponse' '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: SyncMeasurementDataRequest: description: >- Request body for syncing measurement data (ADCP spec alternative to CAPI) type: object properties: measurements: description: Measurement data points to sync (up to 1000 per call) minItems: 1 maxItems: 1000 type: array items: $ref: '#/components/schemas/SyncMeasurementObject' required: - measurements SyncMeasurementDataResponse: description: Response from sync_measurement_data type: object properties: measurements: description: Per-record sync results type: array items: $ref: '#/components/schemas/MeasurementDataSyncResult' required: - measurements additionalProperties: false ErrorResponse: description: Standard error response type: object properties: data: type: string nullable: true enum: - null error: $ref: '#/components/schemas/ApiError' required: - data - error additionalProperties: false SyncMeasurementObject: description: A single measurement data point to sync type: object properties: start_time: description: Start of the measurement period (ISO 8601 with timezone) example: '2026-03-01T00:00:00-05:00' type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$ end_time: description: End of the measurement period (ISO 8601 with timezone) example: '2026-03-07T23:59:59-05:00' type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$ metric_id: description: Type of metric being measured example: incremental_revenue type: string enum: - revenue - incremental_revenue - conversions - incremental_conversions - page_view_count - add_to_cart_count - purchase_count - ltv_1d - ltv_7d - ltv_30d metric_value: description: Measured value for this metric example: 8450.75 type: number unit: description: Unit of measure for the metric value example: currency type: string enum: - currency - count - ratio - percentage currency: description: ISO 4217 currency code — required when unit is "currency" example: USD type: string pattern: ^[A-Z]{3}$ campaign_id: description: Campaign identifier example: camp_456 type: string minLength: 1 maxLength: 255 media_buy_id: description: Media buy identifier example: mb_789 type: string minLength: 1 maxLength: 255 package_id: description: Package identifier example: pkg_001 type: string minLength: 1 maxLength: 255 creative_id: description: Creative identifier example: cr_002 type: string minLength: 1 maxLength: 255 source: description: Who sent the data example: advertiser type: string enum: - advertiser - mmp - measurement_partner source_platform: description: Platform the measurement data originates from example: billy_grace type: string minLength: 1 maxLength: 255 source_metric_name: description: Raw partner metric name for mapping example: Incremental Revenue type: string minLength: 1 maxLength: 255 external_row_id: description: External row identifier for idempotency example: bg_row_001 type: string minLength: 1 maxLength: 255 required: - start_time - end_time - metric_id - metric_value - unit MeasurementDataSyncResult: description: Per-record result from sync_measurement_data type: object properties: index: description: Index of this measurement in the request array type: integer minimum: 0 maximum: 9007199254740991 action: description: What happened to this measurement during sync type: string enum: - created - updated - unchanged - failed error: description: Error message when action is "failed" type: string required: - index - action 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 ````