polymarket_arbitrage

SERVER19hz SOURCEhttps://gateway.pipeworx.io/19hz/mcp

Critical RISK CLASS

Category Financial

Parameters 20 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-pipeworx-io-19hz/polymarket-arbitrage.md

WHAT IT DOES

What polymarket_arbitrage does on 19hz

AI agents use polymarket_arbitrage to commit financial operations through 19hz, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`event`	string	—	Single-event mode (use this if you know the specific Polymarket event): event slug like "fed-decision-may-2026" or "when-will-bitcoin-hit-150k". Full Polymarket
`topic`	string	—	Cross-event mode (use this if you want to scan related events across the platform): a topic or seed question like "Fed rate decision" or "Strait of Hormuz traff

Parameters from the server's own tool schema.

RISK

Why polymarket_arbitrage is rated Critical

This tool is designed to identify and act on financial arbitrage opportunities on Polymarket, a prediction market platform involving real money. It analyzes market pricing anomalies and generates BUY signals, directly facilitating financial trading decisions. Misuse by an AI agent could lead to unintended financial commitments or trades, making this a Financial category tool with critical severity.

From the tool's definition Find arbitrage opportunities on Polymarket...deviations >3pp emit a BUY/

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs polymarket_arbitrage safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 19hz, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For polymarket_arbitrage, this is the rule to start with:

polymarket_arbitrage Approval-gated

Any call to polymarket_arbitrage is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "polymarket_arbitrage": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 19hz, apply this rule, and every polymarket_arbitrage call is checked against it from then on.

FAQ

Questions about polymarket_arbitrage

What does the polymarket_arbitrage tool do? +

Find arbitrage opportunities on Polymarket via monotonicity violations + partition-sum checks. Call with NO args for a trending_scan of the top ~200 markets by weekly volume; pass event for the strongest per-event partition_check, or topic for a themed cross-event scan. event (recommended for a specific market): pass a Polymarket event slug like "fed-decision-may-2026" or "when-will-bitcoin-hit-150k"; walks child markets, checks date-axis / threshold-axis ordering AND computes the partition_check (sum of YES prices across mutually-exclusive legs — should ≈1; deviations >3pp emit a BUY/SELL EVERY LEG signal). topic (for cross-event scanning): pass a seed question like "Strait of Hormuz traffic returns to normal" or "Fed rate decision"; searches related events across the platform, flattens markets, runs the comparator on the union. Cross-event mode catches "...by May 31" vs "...by Jun 30" patterns that single-event misses. SEMANTIC ANCHOR: cross-event pairs require ≥0.30 Jaccard similarity on question tokens (prevents Powell-Fed-Pause being paired with Powell-DOJ-probe); skipped_low_similarity surfaces the rejected pair count. PARTITION FILTER: drops will-person-X / will-manager-Y / will-someone-else- placeholder slugs; partitions with >20% placeholder fraction return null arb signal. Response: opportunities[] (gap_pp, suggested_trade, reasoning, monotonicity violation context), and in event mode partition_check{sum_yes_prices, gap_from_1, placeholders_filtered, suggested_trade}. FILL CHECK: when the partition signal fires, arbitrage.fill_check prices it against live CLOB depth (theoretical_edge_pp_at_book vs realizable_edge_pp at 1000 shares/leg, thin_legs[]) — realizable_edge_pp ≤ 0 means the overround exists only at last-trade, not in the book; do not trade it. For custom sizing use polymarket_fill_risk. It is categorised as a Financial tool in the 19hz MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does polymarket_arbitrage accept? +

polymarket_arbitrage accepts 2 parameters: event, topic. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on polymarket_arbitrage? +

Register the 19hz MCP server in PolicyLayer and add a rule for polymarket_arbitrage: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches 19hz. Nothing to install.

What risk level is polymarket_arbitrage? +

polymarket_arbitrage is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit polymarket_arbitrage? +

Yes. Add a rate_limit block to the polymarket_arbitrage rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block polymarket_arbitrage completely? +

Set action: deny in the PolicyLayer policy for polymarket_arbitrage. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides polymarket_arbitrage? +

polymarket_arbitrage is provided by the 19hz MCP server (https://gateway.pipeworx.io/19hz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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