Odds Compare

{
  "data": {
    "disagreement_flag": false,
    "per_venue": [
      {
        "depth_within_1c_usd": 23836.81,
        "depth_within_5c_usd": 80347.82,
        "implied_p": 0.5965,
        "venue": "kalshi",
        "vig_adjusted_p": 0.5985
      },
      {
        "depth_within_1c_usd": 30913.64,
        "depth_within_5c_usd": 123491.05,
        "implied_p": 0.5702,
        "venue": "polymarket",
        "vig_adjusted_p": 0.5716
      }
    ],
    "venue_spread": 0.0263
  },
  "meta": {
    "data_mode": "live",
    "docs": "https://x402-factory.com/docs/probability.odds-compare",
    "endpoint": "/v1/odds/compare/{slug}",
    "freshness": "realtime",
    "generated_at": "2026-09-29T05:40:59.475Z",
    "request_id": "req_00000000",
    "sources": [
      "kalshi",
      "polymarket"
    ],
    "version": "1.0.0"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://x402-factory.com/v1/odds/compare/:slug'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://x402-factory.com/v1/odds/compare/:slug' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-factory.com%2Fv1%2Fodds%2Fcompare%2F%3Aslug
const res = await pay("https://x402-factory.com/v1/odds/compare/:slug");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://x402-factory.com/v1/odds/compare/:slug")
    print(res.status_code, res.text)