vulcan vs Crosswire — Polymarket & Kalshi Arbitrage
vulcan is a plugin bundle for AI coding tools published by Ellipsis-Labs. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). Crosswire — Polymarket & Kalshi Arbitrage is an MCP server published by crosswire-api.com. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-11-07. 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 |  vulcan |  Crosswire — Polymarket & Kalshi Arbitrage |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 0.5.0 Forks (GitHub): 6 Stars (GitHub): 20 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.6.2 Forks (GitHub): 0 Stars (GitHub): 1 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 | vulcan | Crosswire — Polymarket & Kalshi Arbitrage |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 20 (better) | 1 (worse) |
| Forks (GitHub) (differs) | 6 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | Remote server (api.crosswire-api.com/mcp) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | 2, secrets among them: 1 | Not published |
| Parts of the bundle (differs) | 21 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/ellipsis-labs/vulcan-cli | github.com/nicolasduarte04/crosswire-mcp |
| Changes in the last 7 days | 0 | 0 |
| First seen (differs) | 2026-10-12 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | No HTTP response at the last check (23 h ago) |
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
vulcan
Agent and human-friendly CLI for trading Phoenix perpetual futures on Solana.
Crosswire — Polymarket & Kalshi Arbitrage
Cross-venue Polymarket+Kalshi arbitrage: resolution mismatch, void risk & settlement divergence.
How to run each
vulcan As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install vulcan@claude-communityCrosswire — Polymarket & Kalshi Arbitrage As a remote MCP server
claude mcp add --transport http crosswire-polymarket-kalshi-arbitrage https://api.crosswire-api.com/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Crosswire — Polymarket & Kalshi Arbitrage has a remote endpoint we 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
The marketplaces of Crosswire — Polymarket & Kalshi Arbitrage publish no settings it asks for, so we do not compare settings.
What it can do: vulcan · What it can do: Crosswire — Polymarket & Kalshi Arbitrage · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. 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.