---
title: "Markets in a Manifold group (play-money)"
method: GET
path: "/api/v1/predictions/manifold/group/{slug}/markets"
tags: ["Predictions"]
---

# Markets in a Manifold group (play-money)

`GET /api/v1/predictions/manifold/group/{slug}/markets`

List markets belonging to a Manifold group (topic). Slug resolves to the group id upstream, then markets are fetched. Amounts in mana (M$, play-money; not USD).

## Path parameters

- `slug` string, required — Manifold group slug (URL-friendly identifier).

## Query parameters

- `limit` integer — Maximum number of markets to return.

## Response `200`

Markets within the specified Manifold group.

- EnvelopeManifoldGroupMarketsPayload
  - `data` ManifoldGroupMarketsPayload, required
    - `group` ManifoldGroup, required — Manifold group (topic category).
      - `id` string, nullable — Group id (durable identifier).
      - `slug` string, nullable — URL-friendly slug for the group.
      - `name` string, nullable — Display name of the group.
      - `about` string, nullable — Group description text.
      - `creator_id` string, nullable — Id of the user who created the group.
      - `created_time` string, nullable — Group creation time (ISO 8601 UTC, converted from UNIX milliseconds).
      - `total_members` integer, nullable — Number of users that have joined the group.
      - `privacy_status` string, nullable — Privacy setting: public, curated, or private.
      - `importance_score` number, nullable — Manifold-assigned importance score (0-1, used for ranking).
    - `count` integer, required — Number of markets returned for the group.
    - `markets` ManifoldMarket[], required — Markets belonging to the group.
      - `id` string, nullable — Manifold market id. Durable - use this for links (slugs may change).
      - `creator_id` string, nullable — Id of the user who created the market.
      - `creator_username` string, nullable — Username of the market creator.
      - `creator_name` string, nullable — Display name of the market creator.
      - `question` string, nullable — Market question text shown to users.
      - `slug` string, nullable — URL-friendly slug for the market (can change if creator renames).
      - `url` string, nullable — Canonical Manifold URL for the market.
      - `outcome_type` 'BINARY' | 'MULTIPLE_CHOICE' | 'POLL' | 'BOUNTIED_QUESTION' | 'NUMBER' | 'STONK', nullable — Market outcome type: BINARY, MULTIPLE_CHOICE, POLL, BOUNTIED_QUESTION, NUMBER, or STONK.
      - `mechanism` string, nullable — Market-making mechanism (e.g. cpmm-1, cpmm-multi-1).
      - `token` string, nullable — Currency token. 'MANA' for play-money mana, 'CASH' for sweepstakes cash (rare).
      - `pool` object, nullable — Current liquidity pool balances per outcome, denominated in mana.
      - `probability` number, nullable — Implied probability for binary markets (0.0 to 1.0). Null for non-binary outcome types.
      - `p` number, nullable — Internal market-maker p parameter (CPMM curve shape).
      - `total_liquidity` number, nullable — Total subsidy liquidity in the market, in mana (M$, play-money).
      - `volume` number, nullable — Lifetime volume traded, in mana (M$, play-money).
      - `volume_24h` number, nullable — Volume in the last 24 hours, in mana (M$, play-money).
      - `unique_bettor_count` integer, nullable — Number of distinct users who have placed a bet on this market.
      - `is_resolved` boolean, nullable — True when the market has been resolved to a final outcome.
      - `resolution` 'YES' | 'NO' | 'CANCEL' | 'MKT' | 'CHOOSE_ONE', nullable — Final resolution when resolved: YES, NO, CANCEL, MKT (middle of market), or CHOOSE_ONE.
      - `resolution_probability` number, nullable — Probability value at time of resolution for MKT-resolved markets.
      - `resolver_id` string, nullable — User id of whoever resolved the market.
      - `created_time` string, nullable — Market creation time (ISO 8601 UTC, converted from upstream UNIX milliseconds).
      - `close_time` string, nullable — Scheduled close time after which no new bets are accepted (ISO 8601 UTC).
      - `last_bet_time` string, nullable — Timestamp of the most recent bet on this market (ISO 8601 UTC).
      - `last_updated_time` string, nullable — Timestamp of the last metadata or bet update on this market (ISO 8601 UTC). Used as meta.data_time.
      - `resolution_time` string, nullable — Resolution time once resolved (ISO 8601 UTC).
      - `answers` object[], nullable — Answer array for MULTIPLE_CHOICE or NUMBER markets; each answer has its own probability and pool.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header. JSON body with a stable `code` distinguishing `missing_api_key` (no header sent) from `invalid_api_key` (header sent, key not accepted); any other 401 source carries the generic `unauthorized` with its detail as `reason`. Plus `hint`. `plan` is always null on 401 - an unauthenticated request has no plan; quota exhaustion is 429, not 401.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

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