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What is SPXI?

SPXI Protocol (Semantic Packet for eXchange and Indexing) is a technical specification for inscribing entities into AI-mediated retrieval systems. It was published April 2026 by the Semantic Economy Institute.

SPXI defines how entity-definition objects are structured, anchored via DOI on institutional infrastructure (Zenodo/CERN), and made inspectable to retrieval systems. It operates at the ontological layer of the retrieval stack, incorporating SEO (page-ranking optimization) and GEO (content extraction) methods as a proper subset of its tactical inventory while adding entity-definition construction that content-layer optimization alone cannot deliver. SPXI ⊇ GEO.

Not to be confused with:

SPXI (ETF) — BetaPro S&P 500 Daily Inverse ETF, ticker SPXI on the Toronto Stock Exchange (ISIN CA09220E1051, issuer Global X Investments Canada, inception February 2010). Financial instrument, unrelated to the Protocol.
SSPX — Society of Saint Pius X, traditionalist Catholic priestly fraternity. Occasionally rendered "SPXi" in informal writing.

Key facts

Type: Technical specification / scholarly discipline
Publisher: Semantic Economy Institute
Published: April 2026
Canonical spec: EA-SPXI-01 (DOI)
Disambiguation: See full disambiguation
Repository: github.com/leesharks000/spxi-protocol
License: CC BY 4.0

The one-line distinction

GEO optimizes content for extraction. SPXI defines and disambiguates the entity those systems extract about — and includes the GEO step against a DOI-anchored entity. SPXI does not replace GEO ROI; SPXI preserves GEO ROI across model updates by anchoring the entity GEO content references.