# manifold.markets

**stable** **Advanced**

Latest Manifold markets.

`GET /v1/manifold/markets`

## What you get

A list of Manifold results in Onekey's unified shape, in `data` (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free `404 not_found` instead.

## What it costs

- **Advanced · 5 credits** for a fresh fetch, charged only when it succeeds.
- **Free when served from cache (0.2 credit for a cached response over 100 KB).**
- **Free** if the request is invalid (never charged) or the source fails or reports not found (refunded).

## Parameters

| Name | Type | Required | Default | What it is | Constraints |
| --- | --- | --- | --- | --- | --- |
| `limit` | string | no | `20` | Rows (1-100) | max 3 chars; must match `[1-9]\d?\|100`; trimmed |

## Request

```bash
curl "https://api.onekey.dev/v1/manifold/markets?limit=5" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

res = requests.get(
    "https://api.onekey.dev/v1/manifold/markets",
    params={"limit": "5"},
    headers={"x-api-key": "YOUR_API_KEY"},
)
body = res.json()

if body["success"]:
    print(body["data"])
else:
    print(body["error"]["code"], body["error"]["message"])
```

```javascript
const params = new URLSearchParams({ limit: "5" });
const res = await fetch(`https://api.onekey.dev/v1/manifold/markets?${params}`, {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const body = await res.json();

if (body.success) console.log(body.data);
else console.error(body.error.code, body.error.message);
```

## Recorded response

A real Manifold response, recorded and returned in Onekey's shape. Fields the platform does not provide are `null`.

```json
{
  "success": true,
  "data": [
    {
      "entity": {
        "id": "ySpR5RnEzN",
        "name": "Will China restrict exports of palladium on December 31, 2026?",
        "url": "https://manifold.markets/MikhailTal/will-china-restrict-exports-of-pall",
        "slug": "will-china-restrict-exports-of-pall",
        "category": "BINARY",
        "createdAt": "2026-09-28T20:10:29Z",
        "date": "2026-12-31T00:00:00Z"
      },
      "market": {
        "probability": 0.15,
        "volume": 0,
        "volume24h": 0,
        "liquidity": 100
      },
      "ext": {
        "bettors": 0,
        "resolved": false
      },
      "author": {
        "username": "MikhailTal",
        "displayName": "Mikhail Tal",
        "id": "MFFXxDFFEcQmeX9fwDdxsX9XVIS2",
        "avatarUrl": "https://lh3.googleusercontent.com/a/ACg8ocKBpVVG3fbJS1zFxSqPwUv0-Fnruj3Yd0tgj5-ypVk9km-W=s96-c"
      }
    },
    {
      "entity": {
        "id": "0lzqOIOc28",
        "name": "Will China restrict exports of niobium on December 31, 2026?",
        "url": "https://manifold.markets/MikhailTal/will-china-restrict-exports-of-niob",
        "slug": "will-china-restrict-exports-of-niob",
        "category": "BINARY",
        "createdAt": "2026-09-28T20:09:59Z",
        "date": "2026-12-31T00:00:00Z"
      },
      "market": {
        "probability": 0.21,
        "volume": 0,
        "volume24h": 0,
        "liquidity": 100
      },
      "ext": {
        "bettors": 0,
        "resolved": false
      },
      "author": {
        "username": "MikhailTal",
        "displayName": "Mikhail Tal",
        "id": "MFFXxDFFEcQmeX9fwDdxsX9XVIS2",
        "avatarUrl": "https://lh3.googleusercontent.com/a/ACg8ocKBpVVG3fbJS1zFxSqPwUv0-Fnruj3Yd0tgj5-ypVk9km-W=s96-c"
      }
    }
  ],
  "metadata": {
    "platform": "manifold",
    "endpoint": "markets",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 5,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}
```

## Field mapping

How this endpoint's source fields become Onekey's [unified schema](https://onekey.dev/docs/schema.md). Fields the source lacks come back as `null`.

| Source path | Onekey field | Transform |
| --- | --- | --- |
| `id` | `entity.id` | - |
| `question` | `entity.name` | - |
| `url` | `entity.url` | `safeUrl` |
| `slug` | `entity.slug` | - |
| `outcomeType` | `entity.category` | - |
| `createdTime` | `entity.createdAt` | `toIsoDate` |
| `closeTime` | `entity.date` | `toIsoDate` |
| `probability` | `market.probability` | `toNumber` |
| `volume` | `market.volume` | `toNumber` |
| `volume24Hours` | `market.volume24h` | `toNumber` |
| `totalLiquidity` | `market.liquidity` | `toNumber` |
| `uniqueBettorCount` | `ext.bettors` | `toNumber` |
| `isResolved` | `ext.resolved` | `toBoolean` |
| `creatorUsername` | `author.username` | - |
| `creatorName` | `author.displayName` | - |
| `creatorId` | `author.id` | - |
| `creatorAvatarUrl` | `author.avatarUrl` | `safeUrl` |

## Caching and freshness

- Fresh for about 2 minutes. Repeat calls in that window are served from cache and are free.
- Between 2 minutes and 15 minutes the cached copy is still served instantly and marked `stale: true` while Onekey refreshes it in the background.
- If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
- A "not found" is remembered for 1 minute and is free.
- The cache is shared across all customers, which is what keeps repeat calls cheap.

## What can go wrong

| Status | Code | What to do |
| --- | --- | --- |
| 401 | `unauthorized` | Check the `x-api-key` header. |
| 402 | `insufficient_credits` | [Add credits](https://onekey.dev/pricing); your balance must cover the price. |
| 404 | `not_found` | Unknown endpoint path. |
| 422 | `invalid_params` | Fix the parameters using the table above. Free. |
| 429 | `rate_limited` | Wait `Retry-After` seconds, then retry. |
| 502 | `upstream_error` | The source failed. Refunded; retry with backoff. |

See [Errors](https://onekey.dev/docs/errors.md) for the full list and retry guidance.

Status: stable (verified against the live source).