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Polymarket Crypto Up/Down Markets via x402
x402
Polymarket Crypto Up/Down Markets via x402 is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-02).
Fetches Polymarket prediction market events and odds for crypto price up/down questions, searchable by keyword, paid per-call with USDC on Base via x402.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
Returns a list of Polymarket prediction market events matching the search keyword, each with event title, URL, end date, total liquidity, 24h volume, and an array of individual markets showing yes/no probabilities, best bid/ask prices, 24h volume, liquidity, 1-day probability change, and whether the market is contested. Also includes a top_contested summary highlighting the most actively debated market.
Example use cases
Pre-trade sentiment check for BTC
“Before I take a position, pull the Polymarket prediction markets for bitcoin — show me the top 8 events, especially any contested ones, and tell me what the current yes/no odds and 24h volume look like.”
Ethereum price target research
“Search Polymarket for ethereum price up/down markets, give me up to 5 events with 6 markets each, and highlight the ones with the most liquidity and the biggest 1-day probability swings.”
Macro event crypto impact markets
“Look up Polymarket markets related to 'fed rate' and crypto — I want to see the top contested questions, yes/no probabilities, and 24h trading volume for each.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/api/v1/pm/polymarket/crypto-updown?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time Polymarket prediction market odds for crypto price direction questions — especially for AI trading agents or onchain agents that need crowd-sourced probability signals without setting up API keys. It is ideal for quickly gauging market sentiment on specific crypto assets or macro events affecting crypto, and is cost-effective at $0.003 per call via x402 micropayment.
Side effects
- Payment failure if USDC balance on Base is insufficient (x402 payment required)
- No events found if the search keyword matches no active Polymarket markets
- Stale data if Polymarket API is delayed or updated_at timestamp is old
- Rate limiting or worker timeout on the Cloudflare Workers backend
- Invalid query parameter types (e.g. non-integer limit) may return a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"q": "bitcoin",
"events": [
{
"url": "https://polymarket.com/event/bitcoin-above-on-october-30",
"title": "Bitcoin above ___ on October 30?",
"markets": [
{
"no_prob": 0.38,
"best_ask": 0.63,
"best_bid": 0.61,
"question": "Will the price of Bitcoin be above $80,000 on October 30?",
"yes_prob": 0.62,
"change_1d": 0.05,
"contested": true,
"liquidity": 50000,
"volume_24h": 41000,
"outcome_label": "80,000"
}
],
"end_date": "2026-10-30T16:00:00Z",
"liquidity": 610000,
"volume_24h": 281751.88
}
],
"source": "polymarket",
"n_events": 1,
"updated_at": "2026-10-29T15:30:00Z",
"top_contested": {
"event": "Bitcoin above ___ on October 30?",
"question": "Will the price of Bitcoin be above $80,000 on October 30?",
"yes_prob": 0.62,
"volume_24h": 41000
}
}
}Tags
x402
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