80trust / 100

Prediction Cross Venue Disagreement

x402 APIPassing, checked 4 h ago

Cross-venue prediction market disagreement API for Polymarket, Kalshi, and Gemini. Finds active related markets where venues price the same YES or NO outcome differently, with match confidence, price gap, liquidity, volume, and market identifiers.

GET https://api.seerium.xyz/v1/prediction/cross-venue-disagreement

Last 30 days

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Status and outage history · Atom feed

Uptime: 100%
Response time: 195 ms typical, 314 ms slowest 5%
Last check: 4 h ago
Next check: any minute now

How to call it

GET https://api.seerium.xyz/v1/prediction/cross-venue-disagreement

Each call costs $0.1 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://api.seerium.xyz/v1/prediction/cross-venue-disagreement?includeIndicative=true&limit=25&minGap=0.01&minMatchConfidence=0.7&sources=polymarket%2Ckalshi%2Cgemini

Parameters

Parameter	Type	Required	Description
`includeIndicative`	boolean	No	Optional flag to include indicative price-only markets. Defaults to true.
`limit`	number	No	Optional maximum disagreement rows to return. Defaults to 25.
`minGap`	number	No	Optional minimum price gap. Use 0.01 or 1 for one percentage point. Defaults to 0.01.
`minMatchConfidence`	number	No	Optional minimum market match confidence. Use 0-1 or 0-100. Defaults to 0.7.
`sources`	string	No	Optional comma-separated venue filter: polymarket, kalshi, gemini. Defaults to all.

Example response

The provider's example. We can't check it without paying.

Example response, 191 lines

{
  "data": {
    "criteria": {
      "includeIndicative": true,
      "limit": 25,
      "minGap": 0.01,
      "minMatchConfidence": 0.7,
      "sources": [
        "polymarket",
        "kalshi",
        "gemini"
      ]
    },
    "groups": 42,
    "returned": 1,
    "rows": [
      {
        "gap": 0.1,
        "gapPct": 10,
        "higher": {
          "conditionId": "KXBTC-26MAY31-B100000",
          "endDateIso": "2026-05-31T20:00:00.000Z",
          "eventSlug": "bitcoin-price-may-31-2026",
          "eventTitle": "Bitcoin price on May 31, 2026",
          "indicative": true,
          "lastPrice": 0.5,
          "liquidity": 12800,
          "marketSlug": "kxbtc-26may31-b100000",
          "marketTicker": "KXBTC-26MAY31-B100000",
          "noAsk": 0.51,
          "noBid": 0.49,
          "noPrice": 0.5,
          "price": 0.5,
          "question": "Will Bitcoin be above $100,000 on May 31, 2026?",
          "seriesSlug": "bitcoin",
          "seriesTicker": "KXBTC",
          "source": "kalshi",
          "sourceUpdatedAt": "2026-05-31T15:56:00.000Z",
          "volume": 193200,
          "volume24h": 28450,
          "yesAsk": 0.51,
          "yesBid": 0.49,
          "yesPrice": 0.5
        },
        "id": "disagreement_example",
        "lower": {
          "conditionId": "0xexample-poly",
          "endDateIso": "2026-05-31T20:00:00.000Z",
          "eventSlug": "bitcoin-price-may-31-2026",
          "eventTitle": "Bitcoin price on May 31, 2026",
          "indicative": false,
          "lastPrice": 0.4,
          "liquidity": 9400,
          "marketSlug": "will-bitcoin-be-above-100000-on-may-31-2026",
          "marketTicker": null,
          "noAsk": 0.61,
          "noBid": 0.59,
          "noPrice": 0.6,
          "price": 0.4,
          "question": "Will Bitcoin be above $100,000 on May 31, 2026?",
          "seriesSlug": "bitcoin",
          "seriesTicker": null,
          "source": "polymarket",
          "sourceUpdatedAt": "2026-05-31T15:55:00.000Z",
          "volume": 129300,
          "volume24h": 18450,
          "yesAsk": 0.41,
          "yesBid": 0.39,
          "yesPrice": 0.4
        },
        "markets": [
          {
            "conditionId": "0xexample-poly",
            "endDateIso": "2026-05-31T20:00:00.000Z",
            "eventSlug": "bitcoin-price-may-31-2026",
            "eventTitle": "Bitcoin price on May 31, 2026",
            "indicative": false,
            "lastPrice": 0.4,
            "liquidity": 9400,
            "marketSlug": "will-bitcoin-be-above-100000-on-may-31-2026",
            "marketTicker": null,
            "noAsk": 0.61,
            "noBid": 0.59,
            "noPrice": 0.6,
            "price": 0.4,
            "question": "Will Bitcoin be above $100,000 on May 31, 2026?",
            "seriesSlug": "bitcoin",
            "seriesTicker": null,
            "source": "polymarket",
            "sourceUpdatedAt": "2026-05-31T15:55:00.000Z",
            "volume": 129300,
            "volume24h": 18450,
            "yesAsk": 0.41,
            "yesBid": 0.39,
            "yesPrice": 0.4
          },
          {
            "conditionId": "KXBTC-26MAY31-B100000",
            "endDateIso": "2026-05-31T20:00:00.000Z",
            "eventSlug": "bitcoin-price-may-31-2026",
            "eventTitle": "Bitcoin price on May 31, 2026",
            "indicative": true,
            "lastPrice": 0.5,
            "liquidity": 12800,
            "marketSlug": "kxbtc-26may31-b100000",
            "marketTicker": "KXBTC-26MAY31-B100000",
            "noAsk": 0.51,
            "noBid": 0.49,
            "noPrice": 0.5,
            "price": 0.5,
            "question": "Will Bitcoin be above $100,000 on May 31, 2026?",
            "seriesSlug": "bitcoin",
            "seriesTicker": "KXBTC",
            "source": "kalshi",
            "sourceUpdatedAt": "2026-05-31T15:56:00.000Z",
            "volume": 193200,
            "volume24h": 28450,
            "yesAsk": 0.51,
            "yesBid": 0.49,
            "yesPrice": 0.5
          }
        ],
        "matchConfidence": 0.9,
        "matchType": "strong",
        "matchedOn": {
          "dateKey": "2026-05-31",
          "directionKey": "above",
          "eventKey": "bitcoin price on may 31 2026",
          "numericKey": "100000|31|2026",
          "subjectKey": "will bitcoin be above 100000 on may 31 2026",
          "type": "strong"
        },
        "minutesUntilEnd": 240,
        "outcome": "yes",
        "rationale": "kalshi prices YES 10 points above polymarket on a strong cross-venue match.",
        "sources": [
          "polymarket",
          "kalshi"
        ],
        "topic": "Bitcoin price on May 31, 2026: Will Bitcoin be above $100,000 on May 31, 2026?",
        "totalLiquidity": 22200,
        "totalVolume24h": 46900
      }
    ],
    "sourceCounts": {
      "gemini": 3,
      "kalshi": 4,
      "polymarket": 5
    },
    "sourceUpdatedAt": {
      "gemini": "2026-05-31T15:54:30.000Z",
      "kalshi": "2026-05-31T15:56:00.000Z",
      "polymarket": "2026-05-31T15:55:00.000Z"
    },
    "timestamp": 1760000000000,
    "totalCandidates": 14,
    "warnings": []
  },
  "meta": {
    "freshnessMs": 30000,
    "generatedAt": "2026-03-25T12:00:00.000Z",
    "requestId": "req_example_123",
    "updatedAt": "2026-03-25T11:59:30.000Z"
  },
  "product": {
    "accepts": [
      {
        "network": "eip155:8453",
        "payTo": "0x81832eEDe3a4ad96CB3D7cA09977636D912fd3D5",
        "price": "$0.1000",
        "scheme": "exact"
      },
      {
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "2h752kAbb9z1jpdSzqMEYg9JHv6TPJ6T2BfAJMyjLFtZ",
        "price": "$0.1000",
        "scheme": "exact"
      }
    ],
    "id": "prediction-cross-venue-disagreement",
    "method": "GET",
    "name": "Cross-Venue Prediction Market Disagreement API",
    "networks": [
      "eip155:8453",
      "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
    ],
    "path": "/v1/prediction/cross-venue-disagreement",
    "price": "$0.1000"
  },
  "service": "seerium-x402-api"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.1.

curl: see the payment challenge

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.seerium.xyz/v1/prediction/cross-venue-disagreement?includeIndicative=true&limit=25&minGap=0.01&minMatchConfidence=0.7&sources=polymarket%2Ckalshi%2Cgemini'

# 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://api.seerium.xyz/v1/prediction/cross-venue-disagreement?includeIndicative=true&limit=25&minGap=0.01&minMatchConfidence=0.7&sources=polymarket%2Ckalshi%2Cgemini' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

JavaScript: pay and call

// 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.seerium.xyz%2Fv1%2Fprediction%2Fcross-venue-disagreement
const res = await pay("https://api.seerium.xyz/v1/prediction/cross-venue-disagreement?includeIndicative=true&limit=25&minGap=0.01&minMatchConfidence=0.7&sources=polymarket%2Ckalshi%2Cgemini");
console.log(res.status, await res.text());

Python: pay and call

# 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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.seerium.xyz/v1/prediction/cross-venue-disagreement?includeIndicative=true&limit=25&minGap=0.01&minMatchConfidence=0.7&sources=polymarket%2Ckalshi%2Cgemini")
    print(res.status_code, res.text)

Security scan

No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

When	Result	HTTP	Time	Price
4 h ago	Passed	402	156 ms	$0.1
8 h ago	Passed	402	240 ms	$0.1
12 h ago	Passed	402	142 ms	$0.1
15 h ago	Passed	402	169 ms	$0.1
19 h ago	Passed	402	316 ms	$0.1
23 h ago	Passed	402	221 ms	$0.1
27 h ago	Passed	402	156 ms	$0.1
30 h ago	Passed	402	314 ms	$0.1
34 h ago	Passed	402	298 ms	$0.1
37 h ago	Passed	402	163 ms	$0.1
41 h ago	Passed	402	188 ms	$0.1
45 h ago	Passed	402	231 ms	$0.1
2 days ago	Passed	402	300 ms	$0.1
2 days ago	Passed	402	195 ms	$0.1
2 days ago	Passed	402	161 ms	$0.1

Trust score 80

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		5 / 15
Charges what it lists		10 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.1 per call
Listed at: $0.1
Token: USDC
Networks: Base, Solana
Pays to: 0x8183…d3D5

Real usage

Paying agents: 2 in 30 days
Paid calls: 2 in 30 days
Last paid call: 6 days ago

Source: x402 Bazaar settlement data.

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