Auth and payments for agents. Five lines. No platform lock-in.
from l8nt import Client
client = Client()
response = client.get("https://api.weather.example/forecast?city=tokyo")
print(response.json())Scoped Credentials
Not API keys. Credentials with built-in permissions, budgets, and expiration. Narrow them. Delegate them. Revoke them.
Agent-to-Agent Delegation
Your orchestrator creates a child credential for a sub-agent. Smaller scope, smaller budget. No round trip to any server.
Open Protocol
Built on L402 (HTTP 402). No platform lock-in. Any wallet. Any L402-enabled service. Verify credentials without calling home.
How it works
Delegation
Get early access to the SDK
Be the first to build with Sigil. We'll send you access when it's ready.
FAQ
What is Sigil?
Sigil is L8NTLABS' SDK for agent authentication and payments, built on the L402 protocol (HTTP status code 402, "Payment Required"). It uses macaroon-style tokens that support cryptographic attenuation, meaning any token holder can create a strictly less-powerful version without server involvement.
Do I need to know about Lightning or Bitcoin?
No. The SDK handles payment mechanics transparently. You can connect your own wallet later if you want direct control, but the default experience is "make API calls, pay for what you use" with zero crypto knowledge required.
When does the SDK launch?
We're targeting early access in Q2 2026. Sign up for the waitlist to get notified and receive early access.
Is this open source?
The core protocol specification is open. SDK licensing details will be announced alongside the early access release.