Claude Platform Docs

Get Messages Usage Report

GET/v1/organizations/usage_report/messages

[Legacy] Get a report of your organization's Messages API usage, aggregated into time buckets.

This endpoint is part of the legacy Usage and Cost API. For new integrations, use GET /v1/organizations/analytics/usage in the Usage and Cost Analytics API instead. To move an existing integration, see Migrate from the Usage and Cost API.

Query parameters
starting_at: string

Time buckets that start on or after this RFC 3339 timestamp will be returned. Each time bucket will be snapped to the start of the minute/hour/day in UTC.

formatdate-time
account_ids: optional array of string

Restrict usage returned to the specified user account ID(s).

api_key_ids: optional array of string

Restrict usage returned to the specified API key ID(s).

bucket_width: optional "1d" or "1h" or "1m"

Time granularity of the response data.

default1d
One of the following:
"1d"
"1h"
"1m"
context_window: optional array of BetaAnalyticsContextWindow

Restrict usage returned to the specified context window(s).

One of the following:
"0-200k"
"200k-1M"
ending_at: optional string

Time buckets that end before this RFC 3339 timestamp will be returned.

formatdate-time
group_by: optional array of "account_id" or "api_key_id" or "context_window" or 6 more

Group by any subset of the available options.

One of the following:
"account_id"
"api_key_id"
"context_window"
"inference_geo"
"model"
"service_account_id"
"service_tier"
"speed"
"workspace_id"
inference_geos: optional array of BetaAnalyticsInferenceGeoFilter

Restrict usage returned to the specified inference geo(s). Use not_available for models that do not support specifying inference_geo.

One of the following:
"global"
"not_available"
"us"
limit: optional number

Maximum number of time buckets to return in the response.

The default and max limits depend on bucket_width: • "1d": Default of 7 days, maximum of 31 days • "1h": Default of 24 hours, maximum of 168 hours • "1m": Default of 60 minutes, maximum of 1440 minutes

models: optional array of string

Restrict usage returned to the specified model(s).

page: optional string

Optionally set to the next_page token from the previous response.

service_account_ids: optional array of string

Restrict usage returned to the specified service account ID(s).

service_tiers: optional array of BetaAnalyticsServiceTier

Restrict usage returned to the specified service tier(s).

One of the following:
"batch"
"flex"
"flex_discount"
"priority"
"priority_on_demand"
"standard"
speeds: optional array of "standard" or "fast"

Restrict usage returned to the specified speed(s).

One of the following:
"standard"
"fast"
workspace_ids: optional array of string

Restrict usage returned to the specified workspace ID(s).

Headers
"anthropic-version": optional string

The version of the Claude API you want to use.

Read more about versioning and our version history here.

"anthropic-beta": optional array of AnthropicBeta

Optional header to specify the beta version(s) you want to use.

One of the following:
string
"message-batches-2024-09-24"
"prompt-caching-2024-07-31"
"computer-use-2024-10-22"
"computer-use-2025-01-24"
"pdfs-2024-09-25"
"token-counting-2024-11-01"
"token-efficient-tools-2025-02-19"
"output-128k-2025-02-19"
"files-api-2025-04-14"
"mcp-client-2025-04-04"
"mcp-client-2025-11-20"
"dev-full-thinking-2025-05-14"
"interleaved-thinking-2025-05-14"
"code-execution-2025-05-22"
"extended-cache-ttl-2025-04-11"
"context-1m-2025-08-07"
"context-management-2025-06-27"
"model-context-window-exceeded-2025-08-26"
"skills-2025-10-02"
"fast-mode-2026-02-01"
"output-300k-2026-03-24"
"user-profiles-2026-03-24"
"user-profiles-2026-08-18"
"user-profiles-2026-09-04"
"advisor-tool-2026-03-01"
"managed-agents-2026-04-01"
"cache-diagnosis-2026-04-07"
"dreaming-2026-04-21"
"thinking-token-count-2026-05-13"
"server-side-fallback-2026-06-01"
"server-side-fallback-2026-07-01"
"fallback-credit-2026-06-01"
"fallback-credit-2026-07-01"
"agent-memory-2026-07-22"
"mid-conversation-tool-changes-2026-07-01"
"compact-2026-01-12"
"computer-use-2025-11-24"
"mcp-tunnels-2026-06-22"
"structured-outputs-2025-11-13"
"task-budgets-2026-03-13"
"thinking-display-updates-2026-08-18"
"ce-user-management-2026-07-13"
"mid-conversation-output-config-2026-07-01"
"thinking-binding-controls-2026-08-01"
"mid-conversation-system-clear-at-2026-08-21"
"compact-2026-09-04"
"inline-tools-2026-09-15"
"mcp-client-2026-09-15"
"ce-plugins-2026-09-01"
"spend-limit-reads-2026-09-26"
"telemetry-destinations-2026-08-11"
"webhooks-2026-10-07"
"message-threads-2026-08-12"
"analytics-usage-cost-2026-08-24"
"experimental-claude-tag-2026-10-21"
Returns
BetaMessagesUsageReport object{ data, has_more, next_page }
Get Messages Usage Report
curl https://api.anthropic.com/v1/organizations/usage_report/messages \
    -H 'anthropic-version: 2026-10-21' \
    -H "Authorization: Bearer $ANTHROPIC_API_KEY"
Returns Examples
Response 200
{
  "data": [
    {
      "ending_at": "2025-08-02T00:00:00Z",
      "results": [
        {
          "account_id": "user_01WxYzAbCdEfGhJkMnPqRsTu",
          "api_key_id": "apikey_01Rj2N8SVvo6BePZj99NhmiT",
          "cache_creation": {
            "ephemeral_1h_input_tokens": 0,
            "ephemeral_5m_input_tokens": 0
          },
          "cache_read_input_tokens": 200,
          "context_window": "0-200k",
          "inference_geo": "global",
          "model": "claude-opus-5-5",
          "output_tokens": 500,
          "server_tool_use": {
            "web_search_requests": 10
          },
          "service_account_id": "svac_01Hk3R9TWxq7CfQak00OiVw4",
          "service_tier": "standard",
          "speed": "standard",
          "uncached_input_tokens": 1500,
          "workspace_id": "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"
        }
      ],
      "starting_at": "2025-08-01T00:00:00Z"
    }
  ],
  "has_more": true,
  "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo="
}