Kairos Relationship Memory vs Maindex Expert Memory Service
Kairos Relationship Memory is an MCP server published by agentindexworld. Marketplaces we read that list it: 1 (Official MCP Registry). Maindex Expert Memory Service is an MCP server published by maindex.io. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-20. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Kairos Relationship Memory |  Maindex Expert Memory Service |
|---|---|---|
| Official MCP Registry | Listed, marked deprecated Version: 1.0.0 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Listed Version: 1.0.0 No figure published Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Kairos Relationship Memory | Maindex Expert Memory Service |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 0 | No figure on GitHub |
| Forks (GitHub) (differs) | 0 | No figure on GitHub |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (x402.agentindex.world/mcp/relationship-memory) | Remote server (expert.maindex.io/mcp) |
| Transport | Streamable HTTP | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/comallagency/kairos-x402-service | github.com/maindexapp/maindex |
| Changes in the last 7 days (differs) | 1 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Answered with HTTP 400 (20 h ago) | Responded 40 h ago, requires a key |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Kairos Relationship Memory
Free MCP: relationship_memory validate, store (local), retrieve — portable interlocutor cards v1.
Maindex Expert Memory Service
Full-control memory API for AI agents — memories, collections, links, search, and bulk operations.
How to run each
Kairos Relationship Memory As a remote MCP server
claude mcp add --transport http relationship-memory https://x402.agentindex.world/mcp/relationship-memory/Maindex Expert Memory Service As a remote MCP server
claude mcp add --transport http expert https://expert.maindex.io/mcp --header "X-API-Key: <YOUR_X_API_KEY>"Requires: X-API-Key header
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only the endpoint of Maindex Expert Memory Service responded at the last daily check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Kairos Relationship Memory · What it can do: Maindex Expert Memory Service · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.