> ## Documentation Index > Fetch the complete documentation index at: https://www.adspirer.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Explain Meta Anomaly > User asks why Meta/Facebook/Instagram performance dropped or changed, what happened to their ROAS/CTR/CPM, or wants to understand why a metric changed during a specific period. This tool analyzes why a specific metric changed during a specified period by comparing it to historical baselines and identifying contributing factors. It detects Meta-specific causes including creative fatigue, audience saturation, placement mix shifts, and auction competition. Returns: - Current metric value vs historical averages (30/60/90-day) - Deviation percentages from baselines - Contributing factors ranked by estimated impact - Factor explanations with details - Similar historical periods with comparable changes - Assessment of anomaly severity (CRITICAL/WARNING/MINOR/NORMAL) - Specific recommendations based on detected factors - Quick actionable items When to use this tool: - "Why did my Meta ROAS drop?" - "What happened to my Facebook CTR this week?" - "Why is my Instagram CPM so high?" - "Explain my Meta performance change" - "My conversions dropped last week - why?" - "Why did my frequency spike?" - "What caused my ROAS to decline 40%?" - "Diagnose my Meta performance problem" Parameters: - metric: Required - 'roas', 'ctr', 'cpc', 'cpm', 'conversions', 'conversion_rate', 'frequency', or 'reach' - period_start: Required - Start date (YYYY-MM-DD format) - period_end: Required - End date (YYYY-MM-DD format, must be ≤30 days from start) - ad_account_id: Required for multi-account users. Get from list_connected_accounts Execution time: 3-8 seconds (statistical analysis across multiple periods) Data source: campaign_daily_metrics + meta_placement_daily_metrics + meta_ad_creative_metrics tables Contributing Factors Detected: - CPM Change: Auction competition fluctuations (holidays, competitor activity) - CTR Change: Creative performance (fatigue, messaging, targeting) - Conversion Rate Change: Landing page or offer issues - Frequency Change: Audience saturation (Meta-specific) - Creative Fatigue: High frequency + declining CTR (Meta-specific) - Placement Mix Change: Shift in placement distribution (Meta-specific) - Campaign Changes: Paused/new campaigns affecting overall performance Severity Levels: - 🔴 CRITICAL (≥40% deviation): Immediate action required - 🟡 WARNING (25-40% deviation): Review recommended - 🟢 MINOR (15-25% deviation): Monitor situation - ✅ NORMAL (`<`15% deviation): Within normal variation Similar Historical Periods: Finds past periods with comparable deviations to provide context (e.g., "similar drop occurred during Black Friday 2024") Best for: - Diagnosing sudden performance drops - Understanding seasonal patterns - Identifying actionable causes vs. external factors - Prioritizing optimization efforts ## OpenAPI ````yaml /api-reference/openapi.json post /api/v1/tools/explain_meta_anomaly/execute openapi: 3.1.0 info: contact: email: support@adspirer.com name: Adspirer Support description: >- REST endpoints for every Adspirer tool. Same surface as the MCP server, over plain HTTP for consumers that can't speak SSE (n8n, Zapier, Make, curl, any language's HTTP client). ## Envelope Every request wraps tool-specific input in an `arguments` object: ```json { "arguments": { } } ``` Every response wraps the result in either a success envelope (`success: true`, `data: {...}`) or an error envelope (`success: false`, `error: "..."`, `is_error: true`). ## Authentication Pass your API key as `Authorization: Bearer sk_live_...` on every request. Generate keys at https://adspirer.ai/keys. ## Quota & billing Every successful billable call decrements your monthly tool-call allowance. The current counter is attached to every 200 response under `data.quota`: ```json "quota": { "used": 42, "limit": 150, "tier": "plus", "period_end": "2026-05-01" } ``` When the limit is hit, the API returns HTTP 402 with a full `quota` block including `upgrade_url`. Read-only diagnostic tools (`get_usage_status`, `list_connected_accounts`, `get_connections_status`) are exempt and never consume quota. ## Idempotency Write operations accept an `Idempotency-Key: ` header. A repeated call with the same key returns the cached result rather than executing twice. **Strongly recommended for n8n, Zapier, and any retry-prone client** — it prevents duplicate campaigns when networks misbehave. Generate a fresh UUID per logical operation (not per retry). ## Multi-account users Customers with multiple connected accounts on the same platform (e.g. an agency with 10 Meta ad accounts) must specify which account to use via `ad_account_id`, `customer_id`, `advertiser_id`, or `account_id` depending on the platform. Omitting it returns HTTP 400 with a list of valid account IDs. See `list_connected_accounts` to discover available IDs. ## HTTP status codes - `200` — success (parse `data`) - `400` — tool-level error (surface `error` to users) - `401` — bad/missing API key - `402` — Adspirer quota exhausted - `404` — unknown tool name - `429` — upstream ad platform rate-limited us (Meta/Google/etc.) — retry with backoff - `500` — server error, report to support ## Streaming This endpoint is plain request-response JSON. There is **no SSE, no chunked streaming**. Safe to use from n8n Cloud's HTTP Request node, Zapier Webhooks, Make HTTP module, curl, and every mainstream HTTP library. title: Adspirer REST API version: 1.0.0 servers: - description: Production url: https://api.adspirer.ai security: [] tags: - description: Audit tools name: audit - description: General (Account Management) tools name: general - description: Google Ads tools name: google-ads - description: LinkedIn Ads tools name: linkedin-ads - description: Meta Ads tools name: meta-ads - description: Monitoring & Reporting tools name: monitoring - description: TikTok Ads tools name: tiktok-ads paths: /api/v1/tools/explain_meta_anomaly/execute: post: tags: - meta-ads summary: Explain Meta Anomaly description: >- User asks why Meta/Facebook/Instagram performance dropped or changed, what happened to their ROAS/CTR/CPM, or wants to understand why a metric changed during a specific period. This tool analyzes why a specific metric changed during a specified period by comparing it to historical baselines and identifying contributing factors. It detects Meta-specific causes including creative fatigue, audience saturation, placement mix shifts, and auction competition. Returns: - Current metric value vs historical averages (30/60/90-day) - Deviation percentages from baselines - Contributing factors ranked by estimated impact - Factor explanations with details - Similar historical periods with comparable changes - Assessment of anomaly severity (CRITICAL/WARNING/MINOR/NORMAL) - Specific recommendations based on detected factors - Quick actionable items When to use this tool: - "Why did my Meta ROAS drop?" - "What happened to my Facebook CTR this week?" - "Why is my Instagram CPM so high?" - "Explain my Meta performance change" - "My conversions dropped last week - why?" - "Why did my frequency spike?" - "What caused my ROAS to decline 40%?" - "Diagnose my Meta performance problem" Parameters: - metric: Required - 'roas', 'ctr', 'cpc', 'cpm', 'conversions', 'conversion_rate', 'frequency', or 'reach' - period_start: Required - Start date (YYYY-MM-DD format) - period_end: Required - End date (YYYY-MM-DD format, must be ≤30 days from start) - ad_account_id: Required for multi-account users. Get from list_connected_accounts Execution time: 3-8 seconds (statistical analysis across multiple periods) Data source: campaign_daily_metrics + meta_placement_daily_metrics + meta_ad_creative_metrics tables Contributing Factors Detected: - CPM Change: Auction competition fluctuations (holidays, competitor activity) - CTR Change: Creative performance (fatigue, messaging, targeting) - Conversion Rate Change: Landing page or offer issues - Frequency Change: Audience saturation (Meta-specific) - Creative Fatigue: High frequency + declining CTR (Meta-specific) - Placement Mix Change: Shift in placement distribution (Meta-specific) - Campaign Changes: Paused/new campaigns affecting overall performance Severity Levels: - 🔴 CRITICAL (≥40% deviation): Immediate action required - 🟡 WARNING (25-40% deviation): Review recommended - 🟢 MINOR (15-25% deviation): Monitor situation - ✅ NORMAL (`<`15% deviation): Within normal variation Similar Historical Periods: Finds past periods with comparable deviations to provide context (e.g., "similar drop occurred during Black Friday 2024") Best for: - Diagnosing sudden performance drops - Understanding seasonal patterns - Identifying actionable causes vs. external factors - Prioritizing optimization efforts operationId: execute_explain_meta_anomaly parameters: - description: >- Client-generated UUID to make writes idempotent. Strongly recommended for write tools. A repeat call with the same key returns the cached result instead of re-executing. Example: 550e8400-e29b-41d4-a716-446655440000 example: 550e8400-e29b-41d4-a716-446655440000 in: header name: Idempotency-Key required: false schema: format: uuid type: string requestBody: content: application/json: example: arguments: ad_account_id: string metric: ctr period_end: string period_start: string raw_data: false schema: properties: arguments: description: Input schema for Meta anomaly explanation analysis properties: ad_account_id: anyOf: - type: string - type: 'null' default: null description: >- Meta Ad Account ID. Required for multi-account users. Get from list_connected_accounts. title: Ad Account Id metric: default: ctr description: >- Metric to analyze: 'roas', 'ctr', 'cpc', 'cpm', 'conversions', 'conversion_rate', 'frequency', or 'reach'. Default: 'ctr' title: Metric type: string period_end: anyOf: - type: string - type: 'null' default: null description: >- End date of anomaly period (ISO format: YYYY-MM-DD). Defaults to yesterday. Period must be ≤30 days. title: Period End period_start: anyOf: - type: string - type: 'null' default: null description: >- Start date of anomaly period (ISO format: YYYY-MM-DD). Defaults to 7 days ago. title: Period Start raw_data: default: false description: >- If true, return ONLY raw metrics as a JSON code block (no severity labels, suggested bids/budgets, industry benchmarks, or optimization recommendations). Use when you run your own attribution model or want to minimize token usage. title: Raw Data type: boolean type: object required: - arguments type: object description: >- All tool arguments are wrapped in an `arguments` object. The fields accepted inside `arguments` are listed below — required fields are marked with a red asterisk. required: true responses: '200': content: application/json: example: data: quota: limit: 150 period_end: '2026-05-01' tier: plus used: 42 text: (tool-specific textual output for explain_meta_anomaly) success: true tool: explain_meta_anomaly schema: $ref: '#/components/schemas/SuccessResponse' description: >- Tool executed successfully. `data.text` carries the human-readable result (markdown-friendly). `data.quota` shows your current usage against the plan limit. `data.structured` appears when the tool emits machine-parseable structured content. `data.content` appears for tools that return non-text blocks (images, resources). '400': content: application/json: example: error: >- You have 25 meta_ads accounts connected. Please specify which account to use by passing the ad_account_id parameter: - Acme Holdings (ad_account_id="act_123456789") - Acme EU (ad_account_id="act_987654321") is_error: true success: false tool: explain_meta_anomaly schema: $ref: '#/components/schemas/ErrorResponse' description: >- Tool-level error. The `error` string is safe to surface to end users. Common causes: missing required argument, multi-account user didn't specify which account, upstream platform validation failure. '401': content: application/json: example: error: >- Not authenticated. Please connect your Adspirer account first at https://adspirer.ai is_error: true success: false tool: explain_meta_anomaly schema: $ref: '#/components/schemas/ErrorResponse' description: Invalid, expired, or revoked API key. '402': content: application/json: example: error: |- 🚨 Monthly limit reached (150/150 tool calls on Plus tier). Upgrade to Pro at https://adspirer.ai to keep building. is_error: true quota: limit: 150 period_end: '2026-05-01' tier: plus upgrade_url: https://adspirer.ai used: 150 success: false tool: explain_meta_anomaly schema: $ref: '#/components/schemas/QuotaErrorResponse' description: >- Quota exhausted for the current billing period. The response includes a `quota` block with the current used/limit/tier values and an `upgrade_url` to move up a tier. '404': content: application/json: example: error: 'Tool not found: explain_meta_anomaly' is_error: true success: false tool: explain_meta_anomaly schema: $ref: '#/components/schemas/ErrorResponse' description: Unknown tool_name. Check /openapi.json for the full catalog. '429': content: application/json: example: error: >- Upstream platform rate limit hit (Meta Business Use Case throttle at 95%). Retry after 60 seconds. is_error: true success: false tool: explain_meta_anomaly schema: $ref: '#/components/schemas/ErrorResponse' description: >- Rate-limited by the upstream ad platform (Meta, Google, LinkedIn, TikTok). Retry with exponential backoff. Not the same as Adspirer's own quota — that returns 402. '500': content: application/json: example: error: 'Internal error: RuntimeError' is_error: true success: false tool: explain_meta_anomaly schema: $ref: '#/components/schemas/ErrorResponse' description: >- Unexpected server error. Report to support@adspirer.com with request_id. security: - ApiKeyAuth: [] components: schemas: SuccessResponse: description: >- Returned on HTTP 200. `data.text` is the primary human-readable output. `data.quota` is always present for billable calls. `data.structured` is set only when the tool emits machine-parseable structured content. `data.content` is set only when the tool emits non-text content blocks. properties: data: properties: content: description: Non-text content blocks (images, resources). items: $ref: '#/components/schemas/ContentBlock' type: array quota: $ref: '#/components/schemas/QuotaBlock' structured: additionalProperties: true description: >- Machine-parseable structured content when the tool provides it (e.g. account selection prompts, widget payloads). type: object text: description: >- Human-readable output. Markdown-friendly for tools that emit formatted lists, tables, or recommendations. type: string required: - text type: object success: const: true type: boolean tool: description: Echoed tool_name from the request URL. type: string required: - success - data - tool type: object ErrorResponse: description: >- Returned on HTTP 4xx / 5xx (except 402 which uses `QuotaErrorResponse`). `error` is always a human-readable string safe to surface to end users. properties: error: description: Human-readable error message. type: string is_error: const: true type: boolean structured_content: additionalProperties: true description: >- Present when the underlying tool attached structured metadata to the error (e.g. account-selection lists). type: object success: const: false type: boolean tool: type: string required: - success - error - tool type: object QuotaErrorResponse: description: >- Returned on HTTP 402 when the monthly quota is exhausted. Identical to `ErrorResponse` but with an additional `quota` block. properties: error: type: string is_error: const: true type: boolean quota: $ref: '#/components/schemas/QuotaBlock' success: const: false type: boolean tool: type: string required: - success - error - tool - quota type: object ContentBlock: additionalProperties: true description: >- A non-text content block. Rare today; tools that attach images, resources, or widget payloads populate `data.content` with blocks of this shape. properties: type: example: image type: string required: - type type: object QuotaBlock: description: >- Current quota state for the API key owner. Attached to every successful billable response under `data.quota`, and to 402 errors under `quota` (plus `upgrade_url`). properties: limit: description: Tool call allowance for the current tier. example: 150 type: integer period_end: description: When the monthly counter resets (ISO date). example: '2026-05-01' format: date type: string tier: description: Subscription tier of the account that owns the API key. enum: - free - plus - pro - max example: plus type: string upgrade_url: description: Upgrade link (present only on 402 quota errors). format: uri type: string used: description: Tool calls consumed this billing period. example: 42 type: integer required: - used - limit - tier - period_end type: object securitySchemes: ApiKeyAuth: bearerFormat: API Key (sk_live_...) description: >- API key from https://adspirer.ai/keys. Prefix `sk_live_`. Treat as a secret — never commit. scheme: bearer type: http ````