TOLVYN is the financial control plane for AI infrastructure — the system of record for every API call across OpenAI, Anthropic, and Google.
Live since March 2026 · Open-source pricing database · Apache 2.0 SDKs
The problem
Engineering spent $47K on Claude last month. Which team? Which feature? Which customer? Nobody can answer the CFO's question.
Your AI SDR, support bot, and coding agent each generate thousands of requests daily. None of them appear on one ledger.
When auditors ask for AI usage records, you have provider invoices and Slack screenshots. That's not a financial record.
How it works
One environment variable change. No SDK refactor. Sub-millisecond overhead.
What makes TOLVYN different
Every AI request hash-chained and HMAC-signed. Cryptographic proof, not logs. The CFO can verify it. The auditor can verify it.
Track AI cost per your customer. Know your AI COGS per customer. The unit economics SaaS founders are missing.
Upload your OpenAI / Anthropic / Google invoice. TOLVYN shows the gap. Shadow AI surfaces in minutes.
Per-agent budgets. Runaway detection. Kill switch. Every AI agent on one ledger.
Nightly analysis identifies migration opportunities. Switch to a cheaper model where your actual usage patterns fit.
When OpenAI changes prices, customers using affected models get an alert with an exact impact estimate.
Five-minute integration
# Before
from openai import OpenAI
client = OpenAI(api_key="sk-...")
# After (2-line change)
from tolvyn import OpenAI
client = OpenAI(
tolvyn_api_key="tlv_live_...",
openai_api_key="sk-...", # enables fail-open fallback
team="engineering",
service="chatbot-api"
)
# Everything else identical// Before
import OpenAI from 'openai'
const client = new OpenAI({ apiKey: 'sk-...' })
// After (2-line change)
import { OpenAI } from 'tolvyn'
const client = new OpenAI({
tolvynApiKey: 'tlv_live_...',
openAIApiKey: 'sk-...', // enables fail-open fallback
team: 'engineering',
service: 'chatbot-api'
})# Before
curl https://api.openai.com/v1/chat/completions \
-H "Authorization: Bearer sk-..."
# After (change the URL, keep everything else)
curl https://proxy.tolvyn.io/v1/proxy/openai/v1/chat/completions \
-H "Authorization: Bearer tlv_live_..." \
-H "X-Tolvyn-Team: engineering" \
-H "X-Tolvyn-Service: chatbot-api"pip install tolvyn · npm install tolvyn · go get github.com/tolvyn/tolvyn-go
Works with OpenAI, Anthropic, and Google. If TOLVYN is unreachable, SDK mode automatically retries against the provider directly.
Header-compatible. We read your existing helicone-property-* headers automatically.
Anonymized benchmarks from real production AI traffic. Average cost per request by model. Updated monthly.
View the data →