GET/metaculus/category/{slug}/questionsapiKey2 credits/request
Returns Metaculus question rows for a category. Allowed category slugs: artificial-intelligence, computing-and-math, cryptocurrencies, economy-business, elections, environment-climate, geopolitics, health-pandemics, law, metaculus, natural-sciences, nuclear, politics, social-sciences, space, sports-entertainment, technology.
Required: slug (17 allowed values: artificial-intelligence, computing-and-math, cryptocurrencies, economy-business, elections, environment-climate, geopolitics, health-pandemics, law, metaculus, natural-sciences, nuclear, politics, social-sciences, space, sports-entertainment, technology). Optional: limit.
Sampled 14 Oct 2026: 20 items. Filled in every item: id, question_id, title, question_title, slug, url, status, question_type and 10 more. Not in every item: unit (9), comment_count (12), latest_forecast_center (18), latest_forecast_lower (18), latest_forecast_upper (18), resolved (1). In the sample: open_time: 2024-04-13 to 2026-10-12; comment_count: 1 to 20, median 3; url: metaculus.com; resolved: true in 1 of 1; categories: median 2 entries; forecaster_count: 7 to 288, median 127; forecasts_count: 23 to 567, median 276; latest_forecast_center: 0.12 to 1, median 0.46.
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GET/metaculus/comments-feedapiKey2 credits/request
Returns Metaculus question rows for the questions referenced by the most recent public comments, in comment recency order. Comment bodies are not exposed.
Optional: limit, topic.
Sampled 14 Oct 2026: 20 items. Filled in every item: id, title, slug, url, status, comment_count, open_time, published_at and 3 more. Not in every item: forecaster_count (19), forecasts_count (19), scheduled_close_time (19), scheduled_resolve_time (19), categories (13), question_id (7), question_title (7), question_type (7) and 3 more. In the sample: open_time: 2025-07-21 to 2026-10-06; comment_count: 1 to 34, median 16; url: metaculus.com; title: median 124 characters; categories: median 1 entry; forecaster_count: 3 to 124, median 31; forecasts_count: 5 to 1,753, median 218; scheduled_close_time: 2026-10-21 to 2036-01-01.
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GET/metaculus/project/{slug}/questionsapiKey2 credits/request
Returns Metaculus question rows for one public project, filtered by its slug. A slug that does not exist returns 404.
Required: slug. Optional: limit.
Sampled 14 Oct 2026: 16 items. Filled in every item: id, title, slug, url, status, forecaster_count, forecasts_count, open_time and 7 more. Not in every item: comment_count (15), question_id (14), question_title (14), question_type (14), unit (5), latest_forecast_center (14), latest_forecast_lower (14), latest_forecast_upper (14). In the sample: open_time: 2025-06-11 to 2025-07-01; comment_count: 1 to 18, median 8; url: metaculus.com; title: median 103 characters; categories: median 1 entry; forecaster_count: 49 to 173, median 99; forecasts_count: 208 to 1,673, median 728; scheduled_close_time: 2027-02-28 to 2041-01-01.
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GET/metaculus/question/{id}apiKey2 credits/request
Returns one Metaculus question by numeric `id` (a question or post id). The response has the title, status, question type, unit, open, close and resolve times, forecaster and forecast counts, comment count, latest forecast center and bounds, categories, projects and URL.
Required: id.
Sampled 14 Oct 2026: 1 item. Filled in every item: id, name, slug, type. In the sample: name: “Quantum Computing”; type: “question_series”.
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GET/metaculus/question/{id}/forecast-historyapiKey3 credits/request
Returns public aggregation forecast history points for one Metaculus question. The `method` enum accepts `recency_weighted`, `unweighted`, and `single_aggregation`.
Required: id. Optional: method (3 allowed values: recency_weighted, unweighted, single_aggregation), max_points.
Sampled 14 Oct 2026: 5 items. Filled in every item: start_ts, end_ts, start_time, end_time, forecaster_count, center, lower, upper and 3 more. In the sample: start_ts: 2026-06-22 to 2026-09-02; forecaster_count: 2 to 5, median 4; centers: median 3 entries; end_ts: 2026-06-30 to 2029-06-22; start_time: 2026-06-22 to 2026-09-02; end_time: 2026-06-30 to 2029-06-22; center: 0.47 to 0.74, median 0.57; lower: 0.39 to 0.7, median 0.42.
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GET/metaculus/question/{id}/forecastsapiKey3 credits/request
Returns the latest forecast summary per aggregation method for one Metaculus question, by numeric `id`. Each method has its name, forecaster count, center, lower and upper values, and number of history points. `recency_weighted`, `unweighted` and `single_aggregation` are listed first when present. The question details come with it.
Required: id.
Sampled 14 Oct 2026: 1 item. Filled in every item: id, name, slug, type. In the sample: name: “Quantum Computing”; type: “question_series”.
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GET/metaculus/question/{id}/metadataapiKey3 credits/request
Returns public metadata for one Metaculus question, including option labels, option history, scaling metadata, resolution fields, and timing fields when present.
Required: id.
Sampled 14 Oct 2026: 32 fields returned with a value. In the sample: question.open_time: 2026-06-22; question.comment_count: 5; question.title: “Which country will be first to factor the 2048-bit RSA chal…”; question.url: metaculus.com; question.categories: 3 entries; question.question_title: “Which country will be first to factor the 2048-bit RSA chal…”; question.status: “open”; question.question_type: “multiple_choice”.
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GET/metaculus/question/{id}/optionsapiKey3 credits/request
Returns public multiple-choice option labels and latest option-level forecast values for one Metaculus question. The `method` enum accepts `recency_weighted`, `unweighted`, and `single_aggregation`.
Required: id. Optional: method (3 allowed values: recency_weighted, unweighted, single_aggregation).
Sampled 14 Oct 2026: 3 items. Filled in every item: index, label, center, lower, upper, mean, forecast_value, forecaster_count. In the sample: center: 0.19 to 0.47, median 0.34; label: “United States of America” and 2 other values; lower: 0.05 to 0.42, median 0.34; upper: 0.22 to 0.61, median 0.36; mean: 0.14 to 0.54, median 0.32; forecast_value: 0.19 to 0.47, median 0.34.
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GET/metaculus/questionsapiKey2 credits/request
Returns Metaculus question rows. The endpoint fails closed, returning an error instead of partial data, when the source responds with an authenticated-only response or a challenge page.
Optional: limit, topic.
Sampled 14 Oct 2026: 20 items. Filled in every item: id, question_id, title, question_title, slug, url, status, question_type and 12 more. Not in every item: comment_count (17), categories (19), unit (6). In the sample: open_time: 2020-01-18 to 2026-10-08; comment_count: 2 to 676, median 8; url: metaculus.com; categories: median 1 entry; forecaster_count: 2 to 1,781, median 41; forecasts_count: 2 to 5,851, median 372; latest_forecast_center: 0 to 1, median 0.34; latest_forecast_lower: 0 to 1, median 0.25.
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GET/metaculus/top-commentsapiKey2 credits/request
Returns Metaculus question rows for the questions whose recent public comments collected the highest vote scores over roughly the last week. Comment bodies are not exposed.
Optional: limit, topic.
Sampled 14 Oct 2026: 20 items. Filled in every item: id, title, slug, url, status, comment_count, open_time, published_at and 3 more. Not in every item: question_id (12), question_title (12), question_type (12), forecaster_count (19), forecasts_count (19), scheduled_close_time (19), scheduled_resolve_time (19), categories (13) and 4 more. In the sample: open_time: 2020-01-18 to 2026-10-15; comment_count: 1 to 676, median 12; url: metaculus.com; title: median 108 characters; categories: median 1 entry; question_title: median 128 characters; forecaster_count: 3 to 1,781, median 36; forecasts_count: 5 to 5,851, median 188.
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GET/metaculus/tournament/{slug}/questionsapiKey2 credits/request
Returns Metaculus question rows for one public tournament, filtered by its slug. A slug that does not exist returns 404.
Required: slug. Optional: limit.
Sampled 14 Oct 2026: 20 items. Filled in every item: id, title, slug, url, status, comment_count, open_time, published_at and 3 more. Not in every item: question_id (19), question_title (19), resolved (19), question_type (19), forecaster_count (19), forecasts_count (19), latest_forecast_center (19), latest_forecast_lower (19) and 5 more. In the sample: open_time: 2025-02-17 to 2025-04-12; comment_count: 1 to 61, median 5; url: metaculus.com; resolved: true in 19 of 19; projects: median 1 entry; published_at: 2025-02-14 to 2025-04-12; edited_at: 2025-12-02 to 2026-02-01; forecaster_count: 25 to 141, median 64.
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Metaculus API endpoints