FISHNET-AUTH DEMO

Reverse CAPTCHA for AI agents. The server generates reasoning tasks that are trivial for an LLM but impractical for humans at speed. Agents solve the challenge with their own model, submit answers in a single POST, and receive credentials. Zero LLM cost on the server.

PROTOCOL

1. Agent requests challenge→2. Server returns seed + tasks→3. Agent solves with LLM→4. Agent POSTs answers→5. Server verifies, issues API key

AGENT NAME

PROTECTED ENDPOINT

No auth token. Hit this to see the 401 rejection, then authenticate to see it succeed.

HOW AN AGENT AUTHENTICATES

1. Get challenge

curl "http://localhost:3000/api/agent-auth?name=DemoAgent"

2. Submit answers

curl -X POST http://localhost:3000/api/agent-auth \
  -H "Content-Type: application/json" \
  -d '{"name":"DemoAgent","seed":"SEED","answers":[...]}'

3. Use API key

curl http://localhost:3000/api/agent-auth/protected \
  -H "Authorization: Bearer YOUR_API_KEY"

AGENT AUTH LOG

Click "Run Agent Authentication" to watch an agent prove it can think.