REST API / Polymarket / Volume Chart

Volume Chart (Polymarket, by Condition)

Trading volume time series for a Polymarket market, broken down by YES and NO outcome, computed from market trades.

GET/v2/polymarket/volume-chart/{condition_id}

Query Parameters

condition_idstring (path)Required

Polymarket condition ID (path parameter).

bucketstring

Bucket size: hour | day | week. Default: hour.

start_tsinteger

Start of range, unix seconds. Clamped to >= 2026-05-19T00:00:00Z (the served floor).

end_tsinteger

End of range, unix seconds. Default: now.

Response Schema

condition_idstring

The Polymarket condition ID.

bucketstring

Bucket size: hour | day | week.

bucket_secondsinteger

Bucket size in seconds.

yes_token_idstring | null

Resolved YES outcome token ID.

no_token_idstring | null

Resolved NO outcome token ID.

yes_outcome_labelstring | null

Outcome label used for the YES side (e.g. "Yes", "Up").

no_outcome_labelstring | null

Outcome label used for the NO side (e.g. "No", "Down").

seriesobject[]

Per-bucket volume with YES/NO breakdown, ascending by t.

tinteger

Bucket start (unix seconds).

total_dollarnumber

Total dollar volume in this bucket.

total_sharenumber

Total share volume in this bucket.

yes_dollarnumber

Dollar volume on the YES side.

no_dollarnumber

Dollar volume on the NO side.

yes_sharenumber

Share volume on the YES side.

no_sharenumber

Share volume on the NO side.

_metaobject

Data warning metadata.

data_available_fromstring

ISO8601 served floor — earlier ranges are not served (2026-05-19T00:00:00Z).

warningstring

Plain-text coverage statement.

Error Responses

All errors return the same envelope. The code field is stable and programmatically branchable; error and message are human-readable. errors[] is present only on validation failures with field-level detail. See the full error code reference →

successboolean

Always `false` on error responses.

errorstring

Short, human-readable title (e.g. 'Invalid API Key.').

messagestring

Human-readable explanation for the error. Safe to surface in UIs.

codestring

Stable, hierarchical machine-readable code (e.g. 'validation.invalid_enum'). Use for programmatic handling.

doc_urlstring

Link to this code's entry in the Error Reference.

errorsobject[]

Optional. Present only on validation failures with field-level detail.

fieldstring

Name of the offending parameter.

codestring

Field-level machine code.

messagestring

Human-readable explanation.

Authentication

API Key

To secure your requests, we strongly recommend passing your API key via the X-API-Key header. This prevents sensitive keys from being exposed in access logs or browser history.

Request HeaderX-API-Key: pmx_test_5e8f...

Rate Limits

API rate limits are enforced based on the tier associated with your API key. Limits are tracked on two dimensions: requests per second and requests per month. Each completed request counts toward the global monthly quota. Separate endpoint-group monthly limits (matched markets, arbitrage, EV) only advance when the response body has success: true.

Usage is returned on responses via headers such as:

Response Headers (global)X-RateLimit-Limit-Second: 10X-RateLimit-Remaining-Second: 9X-RateLimit-Limit-Month: 1000X-RateLimit-Remaining-Month: 842Example (endpoint-group, when applicable)X-RateLimit-Limit-Arb-Month: 500X-RateLimit-Remaining-Arb-Month: 412

If you exceed a rate limit, the API returns a 429 status with a Retry-After header indicating when you can resume.

Request

Live API Key

Demo Mode

Verified

Parameters

Condition IDRequired

Bucket

Start (unix seconds)

End (unix seconds)

Response

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