TKBK API quickstart: keys, base URLs and the first request

#One key per model family

A separate key per model family: Claude, GPT, Gemini, Chinese models, Grok — each with its own price. A key looks like cr_… and calls only the models of its family. The ids below are the site’s model catalog — paste them as written.

#See the models of your key

GET /v1/models with your key lists exactly the models that key may call — copy the ids from there. A model of another family is refused with a 403, so this list is also the quickest way to tell which key you hold.

curl https://api.tkbk.online/v1/models \
  -H "Authorization: Bearer cr_YOUR_KEY"

#Base URLs

Only two things change in any tool: the base URL and the key. Paste the address exactly as shown — clients add the rest of the path themselves (an Anthropic client appends /v1/messages to the bare host).

#First request

Replace cr_YOUR_KEY with your key.

Anthropic Messages — a Claude key

curl https://api.tkbk.online/v1/messages \
  -H "Authorization: Bearer cr_YOUR_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-5",
    "max_tokens": 64,
    "messages": [{ "role": "user", "content": "Say one word: works" }]
  }'

OpenAI Chat Completions — a key of any family

The example calls gpt-6.1-sol with a GPT key. With another key, put any id from its /v1/models list into model.

curl https://api.tkbk.online/v1/chat/completions \
  -H "Authorization: Bearer cr_YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "gpt-6.1-sol",
    "messages": [{ "role": "user", "content": "Say one word: works" }]
  }'

#Claude Code

A Claude key. Set two variables and start Claude Code:

export ANTHROPIC_BASE_URL="https://api.tkbk.online"
export ANTHROPIC_AUTH_TOKEN="cr_YOUR_KEY"
# optional: keeps the /effort slider, which Claude Code hides behind a custom base URL
export CLAUDE_CODE_ALWAYS_ENABLE_EFFORT=1

claude

• Signed in to Claude Code with an Anthropic account before? Run /logout inside Claude Code and start it again, so it uses the key.
• Keep one key variable — ANTHROPIC_AUTH_TOKEN, the bare key without “Bearer ” — and do not set ANTHROPIC_API_KEY at the same time.
• Windows PowerShell and settings.json versions: the setup guide.

#Cursor

Cursor → Settings → Models → API Keys. Fill in the fields:

Override OpenAI Base URL:  ON
Base URL:                  https://api.tkbk.online/openai/v1
OpenAI API Key:            cr_YOUR_KEY
Add model:                 gpt-5.6-sol

• GPT models need a GPT key, Claude models a Claude key. The key goes into OpenAI API Key only; leave Anthropic API Key off.
• Add the model by its exact id (Add model) and pick it in the chat instead of Auto.
• Cursor accepts your own keys on its paid plans.

#Codex CLI

A GPT key only. Add the provider to ~/.codex/config.toml:

model = "gpt-5.6-sol"
model_provider = "tkbk"

[model_providers.tkbk]
name = "TKBK"
base_url = "https://api.tkbk.online/openai/v1"
env_key = "OPENAI_API_KEY"
wire_api = "responses"
requires_openai_auth = false

export OPENAI_API_KEY="cr_YOUR_KEY"

codex

#Errors

Writing to support? The error text is enough — never send your API key.

#Top up and keys for other families

• Top up the same key in the cabinet (Top up) or in the Telegram bot: the key and your configs stay the same, and the balance never expires.
• By a Russian bank card, SBP (fast payments), YooMoney or SberPay on the site; crypto (via @CryptoBot) and Telegram Stars only in the Telegram bot @TKBKStorebot. From outside Russia, crypto or Telegram Stars in the bot are the easiest; the key works from any country.
• A new Claude or GPT key is bought on the buy page — for GPT pick “GPT / Codex”.
• Gemini, Chinese models and Grok keys — and a key of any other family than the one you hold — are made in the cabinet: Keys → Model key, paid from the balance of any key you own. The amount is converted at the two families’ prices per $1; see pricing.

#Reselling keys

Selling access to your own customers? Partners & resellers: a wholesale balance, a dashboard and the Partner API to issue keys to your customers.