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Documentation Index

Fetch the complete documentation index at: https://docs.a21e.com/llms.txt

Use this file to discover all available pages before exploring further.

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Overview

BYOK lets you provide your own API keys for LLM providers. a21e handles prompt engineering and execution orchestration; inference calls go directly to your provider account.

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Supported providers

ProviderKey prefixModels available
Anthropicsk-ant-Claude Sonnet 4, Claude Opus 4
OpenAIsk-GPT-4o, GPT-4.1
GoogleAIzaGemini 2.5 Pro, Gemini 2.5 Flash
xAIxai-Grok 3

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Adding a provider key

  1. Go to Settings > Provider Keys in the dashboard
  2. Click Add provider key
  3. Select the provider and paste your API key
  4. The key is encrypted at rest and never logged
Or via API: 
curl -X POST https://api.a21e.com/v1/provider-keys \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "provider": "anthropic",
    "api_key": "sk-ant-..."
  }'

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How billing works with BYOK

Modea21e creditsLLM cost
Managed (no BYOK key)1 credit per enhancement (covers prompt engineering + inference)Included
BYOK (your key)1 credit per enhancement (covers prompt engineering only)Billed by provider directly
Credits are still required in BYOK mode — they cover prompt synthesis, technique selection, quality scoring, and memory. The LLM inference cost is the only part that shifts to your provider account.

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Key security

  • Keys are encrypted with AES-256 before storage
  • Keys are never included in logs, error messages, or API responses
  • Keys are only decrypted at the moment of an LLM call, in memory
  • You can rotate or delete keys at any time