Polymarket outcome price history · Polymarket API

GET https://api.api.sh/polymarket/v1/price-history

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The price (implied probability, 0-1) of one outcome over time: a point per fidelity minutes for a preset interval, or between start and end. Pick the market by slug/id/url plus outcome (default the first, usually Yes), or pass the outcome's token_id.

Every response includes credits_used: the credits this call cost.

Parameters

name	type	description
`slug`	string	Market slug (or id, url, token_id). Example: `will-donald-trump-win-the-2024-us-presidential-election`
`id`	string	Market id.
`url`	string	A polymarket.com market link.
`token_id`	string	Outcome token id (from a market's `outcomes`).
`outcome`	string	Outcome name, e.g. Yes or No (default the first outcome). Example: `Yes`
`interval`	1h \| 6h \| 1d \| 1w \| 1m \| max	1h, 6h, 1d, 1w, 1m or max (default). Example: `max`
`start`	string	Start (ISO); with `end` instead of `interval`; start to end up to 92 days.
`end`	string	End (ISO; default now).
`fidelity`	integer	Minutes per point (default depends on interval: 1 to 1440).

Every endpoint also takes fresh, raw, fields (see lean responses and caching).

Example

curl "https://api.api.sh/polymarket/v1/price-history?slug=will-donald-trump-win-the-2024-us-presidential-election" \
  -H "x-api-key: $APISH_KEY"

import os, requests

res = requests.get(
    "https://api.api.sh/polymarket/v1/price-history",
    params={"slug": "will-donald-trump-win-the-2024-us-presidential-election"},
    headers={"x-api-key": os.environ["APISH_KEY"]},
    timeout=120,
)
res.raise_for_status()
data = res.json()

const url = new URL("https://api.api.sh/polymarket/v1/price-history");
url.searchParams.set("slug", "will-donald-trump-win-the-2024-us-presidential-election");

const res = await fetch(url, { headers: { "x-api-key": process.env.APISH_KEY } });
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
const data = await res.json();

Response

A JSON object with the fields described above, plus raw (the source's own data), cached, fetched_at and credits_used. Errors return {"success": false, "error": "…"} with the HTTP status (see errors). A lookup that ran but found nothing (404) costs the price above; refused calls and errors on our side are free (what's charged).

The fastest way to see the full response is the playground: it runs this endpoint with your account and shows the exact JSON.