January 30, 2026 Documentation update Review recommendedDocumentation Index
Fetch the complete documentation index at: https://docs.lerian.studio/llms.txt
Use this file to discover all available pages before exploring further.
Affects
Teams evaluating or integrating real-time transaction validation and spending controls. This update applies to the public documentation portal. It does not change the runtime API behavior unless the linked product documentation says otherwise.
What changed
We’re excited to announce Tracer — Lerian’s real-time transaction validation and spending control platform. Tracer enables financial institutions to make instant decisions (ALLOW/DENY/REVIEW) for any transaction type in under 100ms, while maintaining regulatory compliance.
What is Tracer?
Tracer is a transaction validation engine optimized for low-latency decisions. It validates pre-enriched payloads against configurable rules and spending limits, returning decisions typically in under 35ms.
Key capabilities
- Real-time validation — Response times under 80ms (p99)
- Rule-based decisions — Expression-based rules using CEL (Common Expression Language)
- Spending limits — Dynamic limits per transaction, account, portfolio, or segment
- Complete audit trail — Immutable records with 7+ year retention for SOX/GLBA compliance
- Product-agnostic — Supports Card, Wire, PIX, and Crypto transactions
Documentation
This release includes comprehensive documentation to help you get started:
Guides
- What is Tracer — Overview of Tracer’s capabilities, scope, and design principles
- Getting Started — Quickstart guide to set up and run your first validation
- Integration Guide — How to integrate your authorization system with Tracer
- Rules Engine — Create and manage expression-based validation rules
- Spending Limits — Configure and monitor spending limits
- Audit and Compliance — Query validation history and audit trail
API Reference
- Validate Transaction — Submit transactions for validation
- Rules API — Create, update, and manage rules
- Limits API — Configure spending limits
- Audit Events API — Query audit trail
- Error Reference — Complete list of error codes
Getting started
Ready to start validating transactions? Head to the Getting Started guide to set up your environment and run your first validation. For questions about scope and design decisions, check out the What is Tracer page, which explains what Tracer focuses on and what it intentionally does not include.
Impact
This is a documentation update. Existing integrations do not need a migration from this release note alone.