# Polymarket Crypto Up-or-Down Markets via 2s.io

> Polymarket Crypto Up-or-Down Markets via 2s.io is a paid API for AI agents from 2s.io, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-15).

Returns live Polymarket prediction market events for 'Will <asset> be up or down by <time>?' series, including question text, dates, USD volume, and nested Up/Down outcome prices (implied probabilities).

## Facts

- Endpoint: GET https://2s.io/api/predict/crypto-updown
- Price: $0.012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-crypto-up-or-down-markets-via-2s-io-74ff88ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k6NXIbCJcXaERqRx0dZfk

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polymarket-crypto-up-or-down-markets-via-2s-io-74ff88ee
```

Example prompt: Pull the latest Polymarket crypto up-or-down prediction markets — show me the top 20 events with their current Up and Down outcome prices for BTC, ETH, SOL, and SPX so I can see what the market is implying about direction.

## When to prefer this

Use this endpoint when you need live, market-implied directional probability for major crypto assets (BTC, ETH, SOL) or SPX, specifically sourced from Polymarket's recurring hourly/daily up-or-down series. Prefer this over general news or sentiment APIs when you want crowd-sourced, financially-staked probability estimates of price direction rather than analyst opinion or raw price data.

## Known failure modes

- limit out of range (must be 1–100): request rejected with validation error
- Polymarket upstream unavailable: stale or empty response
- Network timeout: no response returned
- Invalid query parameter type: non-integer limit causes schema validation failure

## How this service works

Polymarket crypto up-or-down markets — the recurring 'Will <asset> be up or down by <time>?' series for BTC, ETH, SOL, SPX and more (hourly/daily). Each event returns its question, dates, USD volume, and the nested Up/Down markets with live outcome prices (implied probability the asset closes higher). Filter count with limit. Read-only mirror of Polymarket's up-or-down tag.

## Output

A list of up-or-down prediction market events (up to `limit` items), each containing: the event question text (e.g. 'Will BTC be up or down by 1pm?'), start/end dates, total USD trading volume, and nested Up and Down outcome markets with their current live prices (representing implied probability of the asset closing higher or lower).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1,
       "description": "Max events (default 20)."
      }
     },
     "additionalProperties": false
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-crypto-up-or-down-markets-via-2s-io-74ff88ee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 2s.io](https://www.zero.xyz/host/2s.io/llms.txt)