SPAN is a San Francisco-based home energy technology company building smart electrical panels that replace traditional residential breaker boxes with a software-defined, controllable, and metered panel. SPAN Panel provides whole-home real-time power and energy metering, per-circuit monitoring and remote relay control, grid/islanding state management for whole-home backup with solar and energy storage, EV charging coordination via SPAN Drive, and a mobile app for energy management. As of the SPAN Panel firmware r202603 release (Q1 2026), SPAN exposes a public-beta on-premise SPAN API for software integrations between SPAN Panel and other devices on the home Local Area Network. The SPAN API is a real, documented HTTP + MQTT/Homie surface that runs directly on the panel — there is no cloud-hosted developer endpoint. The REST surface provides authentication, system status, Wi-Fi setup, panel state, per-circuit control, panel grid relay, energy storage state-of-energy, and emergency reconnect operations. The publish/subscribe surface uses the Electrification Bus (eBus) framework and Homie Convention over MQTT for streaming real-time panel state, per-circuit telemetry, and control of relays. SPAN API is licensed for personal, non-commercial use under MIT-0 for docs and example code; commercial / fleet use requires the separately licensed SPAN Fleet Manager.
SPAN publishes 9 APIs on the APIs.io network, including eBus MQTT API, Auth API, Circuits API, and 6 more. Tagged areas include Energy, Home Energy, Electrification, Smart Panel, and Electrical Panel.
The SPAN catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 2 Spectral governance rulesets.
SPAN’s developer surface includes authentication, developer portal, documentation, engineering blog, support, changelog, tooling, and 30 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Energy & Utilities regime, so
Regulatory Posture carries 15 points of the composite.
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Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it
carries 10 points of the composite. It is scored from the published contracts
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The six quality facets above are damped to 75 points between them,
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Publish/subscribe streaming API hosted on SPAN Panel using the Electrification Bus (eBus) integration framework and the Homie Convention. SPAN Panel hosts an MQTT broker accessi...
Whole-home and per-circuit real-time power and energy metering
Per-circuit remote relay control with named circuits and priority groups
Grid / islanding state management for whole-home backup with solar and energy storage
SPAN Drive — integrated Level 2 EV charging coordinated with the panel
SPAN Home mobile and on-premise apps for energy management and monitoring
On-premise SPAN API hosted on the panel — REST + MQTT, LAN-only, no cloud
HTTP Bearer JWT authentication minted by the panel and bound to a named API client
REST resources for circuits, panel state, panel grid relay, panel meter and power, islanding state, energy storage SoE and nice-to-have thresholds, Wi-Fi scan/connect, system status, emergency reconnect
MQTT pub/sub via the Electrification Bus (eBus) framework using the Homie Convention
mDNS-advertised local discovery (`_span._tcp`, `_span-api._tcp`, `_mqtt._tcp`) for zero-config integration
JSON Schema for Homie device descriptions and mDNS service records
Publish/subscribe streaming API hosted directly on SPAN Panel using the Electrification Bus (eBus) integration framework and the Homie Convention for MQTT topic and payload stru...
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