Crystil

Crystil (formerly Payloop, trypayloop.com) is an Austin, Texas-based startup building AI cost-observability software: a one-line SDK that tracks LLM spend in real time by task, agent, and customer so teams can compare model providers and protect margins as usage scales. It also ships prompt-injection and jailbreak defenses under a product called Sentinel. The company was co-founded through Struck Capital's startup studio and disclosed a $4.5M raise via SEC Form D in August 2026.

Seed
AI/ML
Enterprise Software
Software & Internet

Round

Industry

Raise timeline

Aug 24, 2026
$4.5M
Seed
Led by Struck Capital
- Moonshots Capital
- Struck Capital
- Service Provider Capital
- Accretion Capital
Crystil Raises $4.5M Seed for AI Cost Observability and Security
Crystil Announces $4.5M Seed Round

Crystil, an Austin, Texas-based startup formerly known as Payloop, has raised $4.5 million in Seed funding. The round was led by Struck Capital, with participation from Moonshots Capital, Service Provider Capital, and Accretion Capital. The funding was disclosed via SEC Form D in August 2026.

What Crystil Does

Crystil builds AI cost-observability software. Its one-line SDK tracks LLM spend in real time by task, agent, and customer, enabling teams to compare model providers and protect margins as usage scales. The company also offers prompt-injection and jailbreak defenses under a product called Sentinel.

Company Background

Crystil was co-founded through Struck Capital's startup studio, which provided early support and resources. The company's pivot from Payloop to Crystil reflects its focus on AI cost management and security.

Use of Funds

While specific allocation of the funds was not detailed, the capital will likely be used to expand product development, grow the team, and accelerate customer acquisition in the AI observability space.

Investor Confidence

The participation of Struck Capital, Moonshots Capital, and others signals strong belief in Crystil's value proposition. As AI adoption grows, tools that provide cost transparency and security are becoming increasingly essential.

For more information, visit crystil.com.