ANTHROPIC SDK COMPATIBILITY
WorldGate exposes an Anthropic-compatible Messages endpoint for supported Claude workflows. Native Anthropic clients can use their familiar system prompt, content blocks, max_tokens, streaming, and tool-shaped requests while authenticating with a WorldGate key. Set the base URL without /v1 because the SDK appends the Messages path.
Create an accountThe Anthropic client sends system instructions separately from messages and returns typed content blocks. Code that depends on those native shapes can use the Messages endpoint instead of translating everything through chat completions.
Initialize the Anthropic client with https://worldgateapi.com as its base URL. The SDK appends /v1/messages, so adding /v1 yourself can create a duplicated path.
Pass WORLDGATE_API_KEY as the client's api_key. This is a WorldGate credential for an independent gateway, not an official Anthropic key, account, Pro plan, or Max subscription.
Messages requests require a positive output ceiling. WorldGate accepts output limits from 1 through 16,384; choose a smaller application-specific maximum when long output is unnecessary.
Do not assume every returned block is plain text. Branch on block type, preserve tool-use identifiers, and return matching tool results. Test the exact streaming and tool workflow before production.
A login prompt usually means the client did not receive the intended key. A 404 often indicates an incorrect base path. A 400 requires checking model, messages, content blocks, and max_tokens. Billing controls can stop an otherwise valid request.
ANTHROPIC SDK
Use the domain as the base URL with no /v1 and authenticate with a WorldGate server-side key.
import os
from anthropic import Anthropic
client = Anthropic(
api_key=os.environ["WORLDGATE_API_KEY"],
base_url="https://worldgateapi.com",
)
message = client.messages.create(
model="claude-opus-5",
max_tokens=1024,
messages=[{"role": "user", "content": "Review this architecture."}],
)
print(message.content[0].text)METHODOLOGY & SOURCES
Native SDK setup reviewed against WorldGate's deployed Messages compatibility tests on July 31, 2026. WorldGate is independent and is not affiliated with Anthropic.
COMMON QUESTIONS
Use https://worldgateapi.com without /v1 because the SDK appends /v1/messages.
No for WorldGate requests. Use a WorldGate key with the WorldGate endpoint. It is not an official Anthropic credential.
Choose a Claude identifier currently returned by WorldGate's model catalogue.
Use an integer from 1 through 16,384 and choose the lowest practical ceiling for the workload.
The compatible Messages surface supports tool-shaped traffic, but applications should test their exact block, streaming, and error-handling behavior.
Lower model cost. Clearer usage.