Api Endpoint

Arb Spread Predictor

Prediction market arbitrage and same-outcome spread API for Polymarket, Kalshi, and Gemini. Finds YES or NO price gaps across venues.

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Offering

Provider: api.seerium.xyz
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Prediction Markets
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://api.seerium.xyz/v1/prediction/arb/same-outcome-spread
MIME type: application/json
First seen: 2026-10-16T01:51:40.954Z
Last seen: 2026-11-02T18:10:58.688Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.1 USDC
Atomic price: 100000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 0.1 USDC
Atomic price: 100000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "100000",
    "payTo": "0x81832eEDe3a4ad96CB3D7cA09977636D912fd3D5"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "100000",
    "payTo": "2h752kAbb9z1jpdSzqMEYg9JHv6TPJ6T2BfAJMyjLFtZ"
  }
]

Observed health

Status: Healthy
Latest latency: 93 ms
Average latency: 98 ms
HTTP status: 402
Last checked: 2026-11-02T18:10:58.683Z
Reachability: 100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "limit": {
          "type": "number",
          "minimum": 1,
          "maximum": 20,
          "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."
        },
        "outcome": {
          "type": "string",
          "enum": [
            "yes",
            "no"
          ],
          "description": "Optional same-outcome filter."
        }
      },
      "additionalProperties": false
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object"
    }
  },
  "required": [
    "type"
  ]
}