> ## Documentation Index
> Fetch the complete documentation index at: https://docs.costgraph.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Serve a cost-alert anomaly chart image

> Renders the anomaly's chart as a PNG for embedding in alert emails, authorized by a signed, time-limited token carried in the URL rather than a session. Always returns a 404 with no body for a missing, tampered, or expired token, or for an anomaly with nothing to chart - never an error page.



## OpenAPI

````yaml /api-reference/costgraph/openapi.json get /api/v1/notifications/chart/{token}
openapi: 3.0.0
info:
  description: Read and manage your CostGraph organization, spend, alerts, and settings.
  title: CostGraph API
  contact: {}
  version: '1.0'
servers:
  - url: https://api.costgraph.ai
security: []
tags:
  - name: ai
    x-group: AI
  - name: ai-serving
    x-group: AI serving
  - name: anomalies
    x-group: Anomalies
  - name: auth
    x-group: Auth
  - name: billing
    x-group: Billing
  - name: billing-export
    x-group: Billing export
  - name: budgets
    x-group: Budgets
  - name: ci
    x-group: CI
  - name: compute-recommendations
    x-group: Compute recommendations
  - name: config
    x-group: Config
  - name: cost
    x-group: Cost
  - name: gpus
    x-group: GPUs
  - name: graphai
    x-group: Graph AI
  - name: infracost
    x-group: Infracost
  - name: integrations
    x-group: Integrations
  - name: invitations
    x-group: Invitations
  - name: kubernetes-clusters
    x-group: Kubernetes clusters
  - name: marketplace
    x-group: Marketplace
  - name: network-requests
    x-group: Network requests
  - name: notifications
    x-group: Notifications
  - name: oauth
    x-group: OAuth
  - name: oauth-clients
    x-group: OAuth clients
  - name: opencost
    x-group: OpenCost
  - name: organization
    x-group: Audit log
  - name: organizations
    x-group: Organizations
  - name: placement-alternatives
    x-group: Placement alternatives
  - name: reports
    x-group: Reports
  - name: service-map
    x-group: Service map
  - name: settings
    x-group: Settings
  - name: sso
    x-group: Single sign-on
  - name: tenants
    x-group: Tenants
  - name: user
    x-group: Users
  - name: virtual-machines
    x-group: Virtual machines
  - name: virtual-tags
    x-group: Virtual tags
  - name: workflows
    x-group: Workflows
paths:
  /api/v1/notifications/chart/{token}:
    get:
      tags:
        - notifications
      summary: Serve a cost-alert anomaly chart image
      description: >-
        Renders the anomaly's chart as a PNG for embedding in alert emails,
        authorized by a signed, time-limited token carried in the URL rather
        than a session. Always returns a 404 with no body for a missing,
        tampered, or expired token, or for an anomaly with nothing to chart -
        never an error page.
      parameters:
        - description: Signed chart token with a .png suffix
          name: token
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: OK
          content:
            image/png:
              schema:
                type: string
                format: binary
        '404':
          description: No body
          content:
            image/png:
              schema:
                type: string

````

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