The connection layer between your software and the European intraday power market. M7 protocol, both versions, fully managed.
EPEX Spot Intraday runs on M7 — a protocol that's evolved across two major versions, with strict sequencing, snapshot/delta order books, and connection rules that punish mistakes. Building this layer in-house takes a year. Maintaining it costs another engineer every year after.
The desks that move first win. The desks that babysit their connection lose.
You connect to Voltnir over REST or gRPC. Voltnir handles M7 — both versions — the order books, the session state, the reconnects, the gap detection. You send orders, you read the book, you trade. The market protocol is our problem, not yours.
Voltnir is delivered as software you deploy on your own infrastructure — your servers, your data center, your cloud tenant. We don't host your order flow. We don't see your positions. We don't have access to your book.
Bare-metal, private cloud, VM, container — Voltnir runs wherever your security team is comfortable. No outbound calls to Voltnir servers required for trading.
Orders, fills, positions, strategy logic — all of it stays inside your network perimeter. We ship a binary; you run it.
Co-location with EPEX gateways is supported. Air-gapped deployments are supported. We help with the setup; we don't operate it.
Voltnir supports virtual members — logical trading entities that map to your real EPEX memberships. The relationship between members and users is many-to-many: one user can act across multiple members, and one member can be operated by multiple users. Each user holds a set of permissions; each member carries its own MW limit.
Group order flow by legal entity, strategy, or trading book. Each member has its own market session, its own credentials, and its own MW limit — a hard cap on open position enforced before orders touch the market.
A user is not bound to a role. Permissions are composable — submit, modify, cancel, adjust limits, read books, export audit — granted per user, per member. Add or revoke without redeployment.
One user can operate on many members. One member can be operated by many users. Voltnir keeps the matrix; every action is attributed to the exact user–member pair.
Energy trading is a regulated business. Voltnir treats audit as a first-class concern, not a bolt-on.
Every order submission, modification, cancellation, and fill is logged with a monotonic sequence number, a UTC timestamp to the millisecond, the originating user, the virtual member, and the resulting market acknowledgement. Every login, every permission change, every limit adjustment is logged the same way. Logs are append-only and can be streamed to your SIEM or compliance archive in real time.
When a regulator asks who placed an order at 14:32:07.124, you have one answer, immediately.
If you've built your strategy, plug it in. Voltnir gives you the market access layer; the trading logic stays yours.
REST covers the obvious surface: place orders, modify, cancel, read the book, list contracts, query positions. Versioned, idempotent where it counts, JSON over HTTPS. Use it from any language. Good for tooling, dashboards, lower-frequency strategies.
gRPC is the same surface plus streaming order book deltas, fills, and session events at wire speed. Use it for latency-sensitive strategies. Protobuf schemas are stable across versions; client stubs ship for Go, Rust, Python, Java, and C++.
No webhooks. No retries with exponential madness. The API does what it says.
Voltnir ships with a full trading desk application. Live order book, order management, position view, cash limits, live metrics. Built on the same API any client would use — battle-tested because we use it ourselves.
Voltnir is sold by license. Onboarding includes deployment support, M7 credential setup, and a co-located test environment.