Prediction Market Data API
GET/v1/predictiondata/calibration
For resolved binary markets, how often the outcome priced at each probability bucket 24 hours before resolution actually won. Refreshes every 24 hours.
Price
$0.015/ callEdge cache
21600s
Uptime 24h
100.00%
p95
3.12s
MCP tool
predictiondata_calibration
The Prediction Market Data API provides prediction market prices, implied probabilities, volumes, movers, resolutions, and history. Data is derived from public Polygon chain data. Payment options include per request in USDC or using an API key. The API offers a calibration endpoint for resolved binary markets.
Parameters
| Name | In | Type | Description |
|---|---|---|---|
| category | query | string |
Code
# 1. No key, no payment: the gateway answers 402 with the price
curl -i "https://api.realtimeapi.ai/v1/predictiondata/calibration"
# 2. Pay: retry with a signed x402 payment (any x402 client builds this header)
curl "https://api.realtimeapi.ai/v1/predictiondata/calibration" -H "PAYMENT-SIGNATURE: $X402_PAYMENT"// npm i @x402/fetch @x402/core @x402/evm viem
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";
const client = x402Client.fromConfig({ schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(privateKeyToAccount(PRIVATE_KEY)) }] });
const pay = wrapFetchWithPayment(fetch, client);
const data = await (await pay("https://api.realtimeapi.ai/v1/predictiondata/calibration")).json();
console.log(data);# pip install x402 eth-account requests
from eth_account import Account
from x402.clients.requests import x402_requests
session = x402_requests(Account.from_key(PRIVATE_KEY))
print(session.get("https://api.realtimeapi.ai/v1/predictiondata/calibration").json())curl "https://api.realtimeapi.ai/v1/predictiondata/calibration" -H "X-API-Key: $RTAPI_KEY"Frequently asked questions
What data is provided?
Prediction market prices, implied probabilities, volumes, movers, resolutions, and history.
How is data derived?
From public Polygon chain data (Polymarket exchange contracts).
What are payment options?
Per request in USDC or using an API key.