MatrixTrak
Tool .NET Reliability

Idempotency Key Designer

Generate idempotency contract templates for APIs with UUID, ULID, or NanoID. Configure format, timestamp inclusion, HTTP context, and copy the generated key.

5key formats
4separator types

Idempotency keys prevent duplicate operations when retries happen. Every POST/PUT request to an exchange or payment API should include a unique idempotency key so that retries don't create duplicate orders or charges.

Generated key

30d46a90-b504-47c0-8f11-7e7cbd847ffa

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Retry Policy Generator

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Log Field Checklist Builder

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Generate structured logging schemas by incident type to track idempotency keys in production.

Exchange Error Code Lookup

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Look up exchange error codes to understand which errors need idempotency retry logic.

Related articles

Idempotency Guide

Idempotency Keys for APIs

How idempotency keys prevent duplicate orders, emails, and writes across APIs. Implementation patterns for REST endpoints with practical code examples.

Crash Recovery

Crash Recovery and Reconciliation Loops

Why trading bots create duplicate orders after crashes, and how idempotency keys in reconciliation loops prevent financial losses during restarts.

Correlation IDs

Correlation IDs in .NET

How to trace requests across services with correlation IDs, and how they complement idempotency keys for end-to-end request tracking.

Retry Logic

When Resilience Makes Outages Worse

Why retries without idempotency keys create duplicate operations, and how combining retries with idempotency keys prevents cascading failures.

Resources and kits

Kit

Crash Recovery and Reconciliation

Code template for detecting orphan and ghost orders after crashes with idempotency-based reconciliation loops for trading bots.

Checklist

Bot Reliability Checklist

Minimum reliability checklist for exchange API bots including idempotency key requirements, retry policies, and order deduplication patterns.

Runbook

Exchange API Ban Prevention

Fast triage for duplicate order issues and idempotency failures across exchanges with recovery procedures.

Axiom Module

Idempotency Implementation Playbook

Prevent duplicate orders, emails, and writes under retries, timeouts, and concurrency. Includes idempotency key strategy guides, middleware patterns, outbox schemas, and failure testing checklists for .NET and API services.

View module

Frequently asked questions

What is an idempotency key?
An idempotency key is a unique identifier sent with API requests. If a request fails or times out, you can retry with the same key and the server knows it's a retry, not a new request. This prevents duplicate orders, payments, or operations.
Which key format is best for APIs?
UUID v7 is recommended for most APIs because it includes a timestamp component, making keys sortable and scannable in logs. ULID is a good alternative with similar properties. Avoid NanoID if you need guaranteed uniqueness at scale.
Should I include HTTP context in the key?
Including HTTP method and path helps with debugging but makes the key longer. For most cases, a UUID v7 with no context is sufficient. Include context only if you need to trace which endpoint generated which key.

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“The retry policy generator alone saved us from a production incident. We had exponential backoff configured wrong for months — the timeline visualization made it obvious instantly.”
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Alex R.

Senior Backend Engineer, Fintech Startup

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