Per-Customer Cost

Know exactly what each customer costs you in LLM spend by tagging requests with their ID.

Tag every request with a customer identifier

Pass your customer’s identifier as a metadata key using X-Toolken-Metadata-Customer-Id. The header suffix maps directly to the customer_id metadata key in the dashboard. Use whatever ID you already have — a user ID, an org slug, or an account number.

from openai import OpenAI

client = OpenAI(
    base_url="https://gateway.toolken.ai/v1",
    api_key="sk-...",  # your provider key, forwarded untouched
    default_headers={
        "X-Toolken-Key": "tk_live_...",
        "X-Toolken-Metadata-Customer-Id": "cust_acme",
    },
)
client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "Generate a project summary."}],
)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://gateway.toolken.ai/v1",
  apiKey: process.env.OPENAI_API_KEY, // forwarded untouched
  defaultHeaders: {
    "X-Toolken-Key": "tk_live_...",
    "X-Toolken-Metadata-Customer-Id": "cust_acme",
  },
});
await client.chat.completions.create({
  model: "gpt-4o-mini",
  messages: [{ role: "user", content: "Generate a project summary." }],
});

curl https://gateway.toolken.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "X-Toolken-Key: tk_live_..." \
  -H "X-Toolken-Metadata-Customer-Id: cust_acme" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt-4o-mini","messages":[{"role":"user","content":"Generate a project summary."}]}'

Open the dashboard and group by Customer

Go to the cost view in the dashboard. Use the “Group by” control to select Customer. Each customer ID appears as a row showing cost, token usage, and request count.

Dashboard showing cost broken down by customer

Set customer via metadata (precedence)

You can set the customer dimension in more than one way on the same request. If you send multiple, the highest-priority one wins:

Priority	Method
1 (highest)	`"customer_id"` key inside the provider request body `metadata` object
2	`X-Toolken-Metadata: {"customer_id":"<id>"}`
3 (lowest)	`X-Toolken-Metadata-Customer-Id: <id>`

Pick one method and stay consistent. The priority only matters when you accidentally set it multiple ways.

Cost per customer per agent

Add X-Toolken-Metadata-Agent alongside X-Toolken-Metadata-Customer-Id to get a two-dimensional view. You can then answer questions like “how much did cust_acme spend on the report-generator agent this month?”.

default_headers={
    "X-Toolken-Key": "tk_live_...",
    "X-Toolken-Metadata-Customer-Id": "cust_acme",
    "X-Toolken-Metadata-Agent": "report-generator",
}

Group by Customer then by Agent in the dashboard to see the breakdown.

Cost Per Agent

Break down spend by agent or workflow.

Cost by Environment

Separate production and staging spend.

Cost Per Agent Compare Providers by Cost

Getting Started

Observability

Providers & Routing

Rate Limits

Integrations

Use cases

Per-Customer Cost

Next

Cost Per Agent

Cost by Environment

​Next

Cost Per Agent

Cost by Environment

Next