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Flags cross-venue resolution mismatches and void risk before execution (Polymarket + Kalshi).
Flags cross-venue resolution mismatches and void risk before execution (Polymarket + Kalshi).
Remote endpoints: streamable-http: https://api.crosswire-api.com/mcp
Valid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.
Endpoint verified · Open access · No issues found
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Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"com-crosswire-api-crosswire": {
"url": "https://api.crosswire-api.com/mcp"
}
}
}From the project's GitHub README.
Pre-trade resolution-risk audit for cross-venue prediction-market arbitrage. Crosswire flags cross-venue resolution mismatches and void risk before execution: void-rule divergence, settlement-scope differences (90-minute vs extra-time), settlement-source and -timing gaps, stale data, and thin liquidity between Polymarket and Kalshi FIFA World Cup 2026 markets — before you execute both legs of a hedge.
It does not predict outcomes and it does not execute trades. It answers one question: if I buy this contract on one venue and sell its twin on the other, do they actually settle on the same thing? When they don't, it names the exact clause that breaks the hedge.
https://api.crosswire-api.com/mcp
Generic MCP client config (mcp.json):
{
"mcpServers": {
"crosswire": {
"url": "https://api.crosswire-api.com/mcp"
}
}
}
Claude Code:
claude mcp add --transport http crosswire https://api.crosswire-api.com/mcp
check_resolution_riskPre-trade safety check for a cross-venue pair. Returns a machine-readable verdict —
execution_verdict: safe / caution / block — inside a full Fungibility & Settlement Audit
Object (FSAO) with structured findings, top-level divergence flags, venue rule overrides,
fee-adjusted spread, and verdict reasons.
Identify the pair by either:
canonical_event_id — a pair id from list_covered_events,
e.g. "wc26:match:MEX-RSA:2026-06-11:result#home" (#home / #draw / #away selects the outcome leg), ormarket_a + market_b — one Polymarket conditionId (0x… hex) and one Kalshi ticker
(e.g. KXWCGAME-26JUN11MEXRSA-MEX), order-insensitive. outcome on a ref is optional —
matching uses only (venue, market_id).Optional: notional_usd (enables the thin-liquidity check at your trade size).
If the pair is not covered, the tool returns a non-error coverage reply (covered: false)
naming the covered matches and the coverage cutoff instead of an FSAO.
Example — real production audit (World Cup opener, Mexico vs South Africa, home leg):
Request:
{
"canonical_event_id": "wc26:match:MEX-RSA:2026-06-11:result#home"
}
Response (abridged with …):
{
"audit_id": "aud_01KTW2Y7S3Q3JFYJK863FJB66X",
"canonical_event_id": "wc26:match:MEX-RSA:2026-06-11:result#home",
"leg_a": { "venue": "polymarket", "market_id": "0x4cd77d45…10ff", "outcome": "Yes" },
"leg_b": { "venue": "kalshi", "market_id": "KXWCGAME-26JUN11MEXRSA-MEX", "outcome": "yes" },
"matching_confidence": 0.98,
"semantically_fungible": false,
"scope_divergence_flag": false,
"void_rule_divergence_flag": true,
"settlement_source_divergence_flag": true,
"settlement_timing_divergence_flag": true,
"polymarket_rule_override": "If the game is canceled entirely, with no make-up game, this market will resolve \"No\". …",
"kalshi_rule_override": "If the game is cancelled or rescheduled to over two weeks away, the market will resolve to a fair price …",
"findings": [
{ "code": "void_rule", "severity": "fatal",
"detail": "Void conditions differ … A core void asymmetry can void one leg while the other settles.",
"affects_fungibility": true },
{ "code": "settlement_source", "severity": "warn",
"detail": "fifa.com (UMA-adjudicated) vs Kalshi internal …" },
{ "code": "settlement_timing", "severity": "warn",
"detail": "2h statistics fallback vs unspecified …" }
],
"fee_adjusted_true_spread": 0.0009,
"snapshot_age_seconds": 61,
"execution_verdict": "block",
"verdict_reasons": [ "void_rule: Void conditions differ …", "…" ],
"ruleset_sha": "…"
}
That block is the product working as intended: a canceled match pays the Polymarket leg
$0 while Kalshi resolves the same position to "a fair price" — the hedge breaks exactly when
you need it.
list_covered_eventsFree discovery of everything check_resolution_risk can audit: the covered canonical events,
their per-outcome pair ids (…#home / #draw / #away), the Polymarket conditionIds and
Kalshi tickers with outcome labels for each pair, match dates, the frozen ruleset_sha
pinning the identity graph, the coverage kickoff cutoff, and snapshot freshness. Takes no
arguments. Use a returned pair_id (or a pair's two market ids) as input to
check_resolution_risk.
| Verdict | Meaning | Agent action |
|---|---|---|
safe | No fatal findings, data fresh. The two contracts settle on the same thing. | Proceed; your stack decides. |
caution | Non-fatal divergence or degraded data (e.g. stale snapshot, thin liquidity, source/timing gaps). | Proceed only if your strategy tolerates the named finding. |
block | A fatal divergence (void-rule asymmetry, scope mismatch, granularity mismatch…) can settle the legs differently. | Do not execute the pair as a hedge. |
Every FSAO carries the findings that produced the verdict — the audit is explainable,
append-only logged server-side, and reproducible from
{ruleset_sha, snapshot_ts, canonical_event_id}.
FIFA World Cup 2026 match markets listed on both Polymarket and Kalshi, expanding in batches
throughout the tournament. Current coverage is always live — query list_covered_events,
or /v1/events and
/v1/health on the REST API. Listings here are
intentionally coverage-generic; the endpoint is the source of truth.
The MCP tools are free at launch — no key. The keyed REST API
(POST /v1/audit, same FSAO) issues free opening-weekend keys by mail:
nicolasduartejaraba@gmail.com.
Crosswire is an advisory data service. Nothing it returns is financial advice.
MIT — covers this repository (listing metadata and documentation). The Crosswire service itself is proprietary.
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