Polymarket Markets API

POST

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Search Polymarket markets by title keyword and order, with outcome prices, volume, liquidity, recent activity, result and the parent event for each market.

Price $6.81 per 1,000 requests ($0.006806 per call). Failed calls and empty results are not charged. Synchronous. For slow jobs add "mode": "async" to the body, take the job_id and poll.

AI prompt

Please help me write a data collection script with the EveryInfra Polymarket Markets endpoint (polymarket/markets).

How the endpoint works:
- Request: POST https://api.everyinfra.com/api/v1/social with the header Authorization: Bearer <API key>. Read the key from the EVERYINFRA_API_KEY environment variable and never hard-code it.
- In the request body, set platform to polymarket and action to markets, and put the parameters inside params.
- No required parameters.
- Optional parameters:
  - keyword: Words to find in market or event titles, at least 3 characters, such as bitcoin or election; leave it out to list everything by the chosen order.
  - sort: Order of the list. markets: volume (default), open_interest, price_desc, price_asc, expiration, created, volume_1d, volume_7d, trades_1d. (allowed: created / expiration / open_interest / price_asc / price_desc / trades_1d / volume / volume_1d)
  - status: open (still trading) or closed (finished); leave it out for both. (allowed: closed / open)
  - limit: The most rows to return in this call, an integer from 1 to 100. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge. (default: 20)
- Returns a list of records. Main fields of each record: id (Polymarket ID of the market or event, a…), condition_id (The market's on-chain condition ID (0x.…), slug (Short name of the market or event in Po…), url, title, description, status (open (still trading) or closed (finishe…), winning_outcome (The winning side of a resolved market,…), outcomes (The outcomes you can buy, each with lab…), volume_usd (Total traded value in US dollars), liquidity_usd (Current order-book liquidity in US doll…), volume_24h_usd (Traded value in the last 24 hours, US d…); 23 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=polymarket.
- Example request body:
{
  "platform": "polymarket",
  "action": "markets",
  "params": {}
}
- Price: $6.81 per 1,000 requests; failed and empty results are not charged.
- For dozens or hundreds of targets, add "mode": "async" to the body: you get a job_id at once and poll GET https://api.everyinfra.com/api/v1/jobs/{job_id} for the result.
- On 422, fix the request using the suggested parameter names and allowed values in the error; on 429 or 503, wait for Retry-After and try again.

Before writing code, ask me which targets I need, how many, which fields, and what output format I want; then confirm the plan and the rough cost with me.

Request parameters

Name	In	Type	Required	Default	Description
`Authorization`	header	`string`	Yes	-	Bearer followed by your API key. Create it in the console; never put it in a URL or a code repository.
`platform`	body	`string`	Yes	`polymarket`	Platform identifier, fixed value.
`action`	body	`string`	Yes	`markets`	Capability identifier, fixed value.
`keyword`	body.params	`string`	No	-	Words to find in market or event titles, at least 3 characters, such as `bitcoin` or `election`; leave it out to list everything by the chosen order.
`sort`	body.params	`string (enum)`	No	-	Order of the list. `markets`: volume (default), open_interest, price_desc, price_asc, expiration, created, volume_1d, volume_7d, trades_1d. `events`: created (default), start_date, end_date, volume_1d, volume_7d, volume_all_time, open_interest, trades_1d.Allowed values`createdexpirationopen_interestprice_ascprice_desctrades_1dvolumevolume_1dvolume_7d`
`status`	body.params	`string (enum)`	No	-	open (still trading) or closed (finished); leave it out for both.Allowed values`closedopen`
`limit`	body.params	`integer (1–100)`	No	`20`	The most rows to return in this call, an integer from 1 to 100. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge.

Code samples

bash

curl -X POST 'https://api.everyinfra.com/api/v1/social' \
  -H "Authorization: Bearer $EVERYINFRA_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "platform": "polymarket",
  "action": "markets",
  "params": {}
}'

OpenAPI definition (JSON)Samples read the key from the EVERYINFRA_API_KEY environment variable; copied code never contains your key.

Response example

Field preview

No sample response is available for these parameters yet. This preview shows the response shape and fields from the API definition, with … as placeholders; it is not the result of a live call.

json

{
  "id": "req_…",
  "platform": "polymarket",
  "action": "markets",
  "results": [
    {
      "id": …,
      "condition_id": …,
      "slug": …,
      "url": …,
      "title": …,
      "description": …,
      "status": …,
      "winning_outcome": …,
      "outcomes": …,
      "volume_usd": …,
      "liquidity_usd": …,
      "volume_24h_usd": …,
      "volume_7d_usd": …,
      "trades_24h": …,
      "tags": …,
      "event_id": …,
      "event_slug": …,
      "event_title": …,
      "image_url": …,
      "start_at": …,
      "end_at": …,
      "closed_at": …,
      "created_at": …,
      "platform": …
    }
  ],
  "count": …,
  "billing": {
    "charged": …,
    "charged_usd": …,
    "balance_after_usd": …,
    …
  },
  "quota": { … }
}

Response fields

Business data is in results. The table lists the fields a record can contain; values the platform does not show are never made up.

Field	Meaning
`id`	Polymarket ID of the market or event, as a string.
`condition_id`	The market's on-chain condition ID (0x...); pass it as `market` to trades.
`slug`	Short name of the market or event in Polymarket links; a market slug works as `market` for trades.
`url`	Link to the record on the platform.
`title`	Title. null when the platform has no titles (for example text-only posts).
`description`	Summary or description, usually shorter than text.
`status`	open (still trading) or closed (finished).
`winning_outcome`	The winning side of a resolved market, such as Yes; absent before resolution.
`outcomes`	The outcomes you can buy, each with label, token_id and price (0 to 1, readable as the market-implied probability; 1 for the winner after resolution).
`volume_usd`	Total traded value in US dollars.
`liquidity_usd`	Current order-book liquidity in US dollars.
`volume_24h_usd`	Traded value in the last 24 hours, US dollars.
`volume_7d_usd`	Traded value in the last 7 days, US dollars (markets).
`trades_24h`	Trades in the last 24 hours (markets).
`tags`	Tags; absent when there are none.
`event_id`	ID of the parent event (markets).
`event_slug`	Short name of the parent event (markets).
`event_title`	Title of the parent event (markets).
`image_url`	Image link. Capabilities with several images may return an image_urls array.
`start_at`	Start time, ISO 8601 UTC.
`end_at`	Scheduled end time, ISO 8601 UTC.
`closed_at`	Actual close time, ISO 8601 UTC; absent while open.
`created_at`	Creation time, same format as posted_at.
`platform`	Source platform identifier, the same as platform in the request (for example xiaohongshu, tiktok).

Errors and billing

401: Missing or invalid key.
402: Insufficient balance. Top up first.
422: Invalid parameter name or value. Fix it using the suggestions in the error. No charge.
429: Per-minute request limit reached. Wait for Retry-After, then try again.
503: Could not complete. The held charge is returned to your balance. If the outcome is unknown, verify it before you retry.
200 empty: No data. No charge.

Errors