# Seerium Prediction Market Arbitrage API

> Seerium Prediction Market Arbitrage API is a paid API for AI agents from api.seerium.xyz, paid per call via x402, $0.003000/call, status unknown (last checked 2026-09-15).

Finds full-cover arbitrage opportunities across Polymarket, Kalshi, and Gemini by identifying YES+NO combinations with positive net edge

## Facts

- Endpoint: GET https://api.seerium.xyz/v1/prediction/arb/full-cover
- Price: $0.003000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-seerium-xyz-57a4dfa1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CHgVk4LoDEj7NM9aUo_zv

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability api-seerium-xyz-57a4dfa1
```

Example prompt: Can you scan Polymarket, Kalshi, and Gemini for full-cover arbitrage right now — show me up to 10 opportunities with at least 1% net edge, and include indicative rows too?

## When to prefer this

Choose this endpoint when you need to identify cross-venue prediction market arbitrage between Polymarket, Kalshi, and Gemini specifically, and want structured, pre-ranked opportunities with net edge already computed. Prefer over manual price comparison when you need real-time full-cover arb detection with venue filtering.

## Known failure modes

- No arb opportunities found above the requested minEdge threshold
- Invalid sources parameter (non-supported venue name)
- limit exceeds hard cap of 20 — clamped or rejected
- Payment failure via x402 protocol
- Rate limiting or quota exhaustion
- Stale or indicative prices may not reflect executable fills

## How this service works

Crypto and prediction market intelligence through x402.

## Output

Returns a list of up to 20 arbitrage rows, each showing the YES and NO leg venues, contract details, prices, and the net positive edge available for a full-cover position spanning Polymarket, Kalshi, and/or Gemini.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "limit": 5,
   "minEdge": 0.02,
   "sources": "polymarket",
   "includeIndicative": false
  }
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "number",
       "maximum": 20,
       "minimum": 1,
       "description": "Optional maximum arb rows to return. Defaults to 20 and is hard-capped at 20."
      },
      "minEdge": {
       "type": "number",
       "minimum": 0,
       "description": "Optional minimum net arb edge as a decimal or percentage-style value."
      },
      "sources": {
       "type": "string",
       "description": "Optional comma-separated venue filter: polymarket, kalshi, gemini."
      },
      "includeIndicative": {
       "type": "boolean",
       "description": "Optional flag for indicative price-only rows. Defaults to true."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "rows": [
    {
     "id": "arb_full_cover_example",
     "no": {
      "side": "BUY",
      "size": null,
      "price": 0.54,
      "source": "kalshi",
      "outcome": "no",
      "tokenId": "KXEXAMPLE:NO",
      "question": "Will example event happen by Friday?",
      "marketUrl": "https://kalshi.com/markets/kxexample",
      "priceType": "ask",
      "endDateIso": "2026-03-30T00:00:00.000Z",
      "eventTitle": "Example Event",
      "indicative": true,
      "marketSlug": "KXEXAMPLE",
      "totalDepth": null,
      "conditionId": "KXEXAMPLE",
      "eventTicker": null,
      "marketTicker": "KXEXAMPLE",
      "seriesTicker": null
     },
     "key": "question:will example event happen by friday:date:2026-03-30",
     "yes": {
      "side": "BUY",
      "size": null,
      "price": 0.42,
      "source": "polymarket",
      "outcome": "yes",
      "tokenId": "poly_yes_token",
      "question": "Will example event happen by Friday?",
      "marketUrl": "https://polymarket.com/market/example-market",
      "priceType": "ask",
      "endDateIso": "2026-03-30T00:00:00.000Z",
      "eventTitle": "Example Event",
      "indicative": true,
      "marketSlug": "example-market",
      "totalDepth": null,
      "conditionId": "0xexample",
      "eventTicker": null,
      "marketTicker": null,
      "seriesTicker": null
     },
     "edge": 0.04,
     "legs": [
      {
       "side": "BUY",
       "size": null,
       "price": 0.42,
       "source": "polymarket",
       "outcome": "yes",
       "tokenId": "poly_yes_token",
       "question": "Will example event happen by Friday?",
       "marketUrl": "https://polymarket.com/market/example-market",
       "priceType": "ask",
       "endDateIso": "2026-03-30T00:00:00.000Z",
       "eventTitle": "Example Event",
       "indicative": true,
       "marketSlug": "example-market",
       "totalDepth": null,
       "conditionId": "0xexample",
       "eventTicker": null,
       "marketTicker": null,
       "seriesTicker": null
      },
      {
       "side": "BUY",
       "size": null,
       "price": 0.54,
       "source": "kalshi",
       "outcome": "no",
       "tokenId": "KXEXAMPLE:NO",
       "question": "Will example event happen by Friday?",
       "marketUrl": "https://kalshi.com/markets/kxexample",
       "priceType": "ask",
       "endDateIso": "2026-03-30T00:00:00.000Z",
       "eventTitle": "Example Event",
       "indicative": true,
       "marketSlug": "KXEXA
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-seerium-xyz-57a4dfa1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.seerium.xyz](https://www.zero.xyz/host/api.seerium.xyz/llms.txt)