# OpenAI Billing — MCP server on mcp.ai
> OpenAI organization usage and cost reporting through an admin API key connected by the user.

By: mcp.ai · official
Page: https://mcp.ai/openai_billing

## Connect (MCP protocol)
Remote MCP endpoint (HTTP, streamable): https://api.mcp.ai/p_openai_billing?ms=1781045820000
Add it as a custom/remote MCP connector, then authenticate when prompted.

## REST API (no MCP client required)
Every tool is also a REST endpoint, authed with a workspace API key.
Discover: GET https://api.mcp.ai/api/openai_billing/_endpoints   # public; lists every endpoint
Call:     POST https://api.mcp.ai/api/openai_billing/<endpoint>
  Authorization: Bearer sk_live_…   # create one at https://mcp.ai/settings/api-keys
  Content-Type: application/json
  Body: { …args }   →   { "ok": true, "tool": "<id>", "result": { … } }

## Developer docs
How to use (MCP or REST), markdown: https://mcp.ai/openai_billing/skill.md
Postman collection (v2.1): https://mcp.ai/openai_billing/postman.json

## Tools
- openai_billing_cost(days_back?: integer, start_time?: integer, end_time?: integer, bucket_width?: string, group_by?: string, limit?: integer, account?: string) — Get normalized OpenAI organization costs for a date range. Returns compact totals and daily costs.
- openai_billing_list_accounts(account?: string) — List OpenAI Billing admin API connections linked to this install.
- openai_billing_usage(kind?: string, days_back?: integer, start_time?: integer, end_time?: integer, bucket_width?: string, group_by?: string, limit?: integer, account?: string) — Get normalized OpenAI organization usage for completions, embeddings, images, audio, vector stores, or code interpreter sessions.

## Example prompts
- "Show OpenAI costs for the last 30 days"
- "Break down OpenAI completion usage by day"
- "Compare OpenAI usage across embeddings and completions"

## Links
Docs: https://mcp.ai/docs/mcps/openai_billing
Website: https://mcp.ai/mcps/openai_billing