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Use the Anthropic-compatible base URL with a Tokenless API key: 
https://api.usetokenless.com/anthropic
Tokenless supports Anthropic’s Messages and Models routes, preserving the compatible request and response formats while routing behind profiles such as tokenless-pro.

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Use an Anthropic client

from anthropic import Anthropic
import os

client = Anthropic(
    base_url="https://api.usetokenless.com/anthropic",
    api_key=os.environ["TOKENLESS_API_KEY"],
)

message = client.messages.create(
    model="tokenless-pro",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)

print(message.content[0].text)

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://api.usetokenless.com/anthropic",
  apiKey: process.env.TOKENLESS_API_KEY,
});

const message = await client.messages.create({
  model: "tokenless-pro",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});

console.log(message.content[0]);

curl https://api.usetokenless.com/anthropic/v1/messages \
  -H "x-api-key: $TOKENLESS_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "tokenless-pro",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

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Use Claude Code with tkl

With the Tokenless CLI installed, sign in once and launch Claude Code through the Anthropic-compatible route. No API key setup is required. 
tkl login
tkl claude
For the full upstream specification, see the Claude Messages API reference. Use these pages for the Tokenless-compatible routes and routing behavior.