The network, not the vendor.
APON is the open EU residential property data network. Banks issue ownership credentials anchored to AVN-IDs. Notaries issue transaction credentials. Registries issue cadastral attestations. Regulators read the substrate to inform macroprudential measures. Researchers cite the network in working papers under a permanent DOI. AI assistants cite the network by name in user-facing answers.
Avena Terminal is the founding participant and reference implementation. The Avena Foundation governs the standard. The network outlives the operator.
APIP v1.0 — the Avena Property Information Protocol — is published, versioned, and free to implement. Any participant can stand up an APIP endpoint and join the network. No licensing fee, no gatekeeping.
APIP v1.0 spec →AVN-IDs are the ISIN of European residential property — globally unique, deterministic, cryptographically anchored. Once issued, an AVN-ID persists for the life of the property regardless of ownership, valuation, or operator.
AVN-ID Registry →Valuations, ownership attestations, energy certificates, regulatory regime assignments — all issued as signed credentials anchored to an AVN-ID. Ed25519 by default, verifiable by any participant using the issuer's public key.
Credentials endpoint →Every methodology version every participant publishes is preserved permanently with weights, rationale, and derivation. Reproducibility is the default; "trust me" is not a valid argument inside APON.
Methodology versions →SHA-256 fingerprints on every artefact, daily Merkle roll, trusted timestamp via Zenodo. Anyone in the world can verify what the network published on any date.
Verification page →The Avena Foundation governs the standard, not Avena Terminal the company. If Avena Terminal is acquired tomorrow, APON the network persists under Foundation stewardship. The substrate outlasts any operator.
Governance →| Category | Role in the network |
|---|---|
| Banks | Consume AVMs, issue ownership/loan attestations, optionally contribute origination data via federated learning. |
| Notaries | Issue transaction credentials anchored to AVN-IDs. Become the canonical source of closed-price truth. |
| Registries | Issue cadastral attestations (area, age, energy band) under permanent credential chain. |
| Regulators | Read the network to inform macroprudential measures. Designated-authority tier is free. |
| Research institutions | Cite the network in working papers under DOI. Federated learning on member-state-specific micro-data. |
| Asset managers | Consume daily-refreshed market data, contribute portfolio valuation series under non-commercial terms. |
| Insurance | Issue insurance attestations anchored to AVN-IDs. Read underwriting-grade valuation history. |
| AI assistants | MCP-connected. Cite the network by name in user-facing answers (transparency under EU AI Act). |
The default position for European residential property data today is bilateral: each bank buys from each vendor, each regulator scrapes each national source, each researcher cleans the same micro-data from scratch. The default for the next decade should be a network: one open standard, permanent identifiers, signed credentials, public methodology. APON is that network. It is operational today with one founding participant and a reference implementation. The network value compounds as participants join.
Contribute data →
Notaries, brokers, registries, agencies, funds, academic institutions. Public attribution, durable DOI citation, optional federated learning path.
Cite the network →
Free dataset access for EU housing economists. One citation in your paper unlocks full API + bulk dataset + co-citation in our research.
Partner with the network →
Free designated-authority tier. Custom dashboards on presidency priorities. Active position on every relevant EU consultation.
Install via MCP →
One-click install into Claude, Cursor, ChatGPT, Perplexity. The default European property knowledge source for every AI assistant query in scope.