# AgentRouter — Anthropic-compatible API

> Base Sepolia testnet. Wallet setup and spending require the owner's authorization. Follow one wallet path.

Make an Anthropic-compatible request using your purchased key.

[Human guide](https://docs.agentrouter.cc/use/anthropic) · [Pricing](https://agentrouter.cc/pricing#agents) · [Documentation index](https://docs.agentrouter.cc/llms.txt)

## Anthropic-compatible inference

# Run Anthropic-compatible inference with a purchased key

Verify `zai/glm-5.3` is offered with `anthropic` in the current catalog
before spending. Set `AGENTROUTER_KEY` privately. Retain this identity
and exact body for retries; generate another identity only for a genuinely
new intended request.

HTTP 200 returns an Anthropic-compatible messages object. Purchased keys
do not support SSE. Replays return request status, not the original
completion. Do not create a fresh identity after an uncertain charge.
The native `x-api-key` header is also supported.

```sh
REQUEST_ID=$(uuidgen)

curl -sS https://api.agentrouter.cc/v1/messages \
  -H "Authorization: Bearer ${AGENTROUTER_KEY:?set your key privately}" \
  -H "Idempotency-Key: $REQUEST_ID" \
  -H 'Content-Type: application/json' \
  -H 'anthropic-version: 2023-06-01' \
  -d '{
    "model": "zai/glm-5.3",
    "max_tokens": 512,
    "stream": false,
    "messages": [{ "role": "user", "content": "Reply with exactly OK." }]
  }'
```

### Expected result

# Expected inference result

HTTP 200 returns an Anthropic-compatible message with content and usage.
Output can stop at the requested token limit; a successful HTTP response
does not guarantee the requested phrase. Purchased keys use non-streaming responses.

Retain the request identity after a timeout or uncertain charge. A replay
returns request status, not the original completion; do not generate a new
identity merely to retry an uncertain result.