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 API contracts indexed 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.
40.1/100developing▬ flatAgent24/100agent awareFront door AI3/6
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Heartbeat100/100
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saas · MIT-0 (Docs and example code)
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scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
Regulatory Posture applies to this provider. Its tags matched the
Energy & Utilities regime, so
Regulatory Posture carries 15 points of the composite.
If this regime is wrong for your business, say so on your
provider repo — the
applicability map is public and we will correct it.
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
themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already
holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in
front of it, and the first time that check is skipped a duplicate record is created.
Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet,
not penalised by it.
The six quality facets above are damped to 75 points between them,
because the conditional facet above carries the other
25. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 75% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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Agent readiness — checks not met, largest first (exact, from this profile):
MCP Server+12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency+9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card+8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples+7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity+6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
8 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
Access Clarityscores 18.4 — up to +16.3 composite points
The Kin Score Market layer reads a provider inside its market:
its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted:
not part of the Kin Score or agent readiness.
Registered MCP server and declares compatibility are report only — not weighted.
Undeclared means we found nothing we can read, so there is no number: we never infer integrations.
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
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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