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API · /manifold-api

Manifold API

healthy 4,757 Subscribers

Live prediction-market and forecaster data from Manifold, the largest play-money prediction market and forecasting community, via its public API. On Manifold anyone can create a market and everyone trades with mana, the platform's play-money, so each market's price is a crowd-sourced probability and every trader has a track record. Search markets and get each one's question, current probability, mana volume, unique-bettor count, liquidity and creator. Read one market in full, with its description and close time. See the top holders of a market — who is forecasting which way and how much mana they have invested. Read a forecaster's profile: their mana balance, all-time profit and how many markets they have created. Live, no key, nothing stored. Distinct from real-money prediction-market and sports-odds APIs — this is Manifold's community markets, their crowd probabilities and their forecasters. Perfect for forecasting, trading-signal, research and community apps.

#manifold #prediction-market #forecasting #probabilities #trading #signals #community #markets
api.oanor.com/manifold-api
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Machine-readable spec so AI agents can integrate this API.

/api/manifold-api/openapi.json
/api/manifold-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
323 ms
Server probes · 24h
Subscribers
4,757
active
Total calls
8
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 10,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 10k calls/month
  • 3 req/sec
  • Markets + market + positions + user
  • No credit card
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Starter

€9.00 /month

  • 162,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 162k calls/month
  • 6 req/sec
  • Email support
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Pro

€25.00 /month

  • 915,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 915k calls/month
  • 15 req/sec
  • Priority support
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Business

€63.00 /month

  • 4,950,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 4.95M calls/month
  • 40 req/sec
  • Dedicated SLA
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Built by

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Related APIs

Other APIs with overlapping tags.

Polymarket API

Live prediction-market data from Polymarket, the largest real-money prediction market, via its public Gamma API. On Polymarket people trade shares in the outcome of real-world events, so each market's price is a live, money-backed probability. Get the most active markets, each with its outcomes and their implied probabilities, the best bid and ask, the traded volume and the liquidity. Read one market in full, including its description and resolution date. Pull the biggest events — an event groups related markets, like a championship with one market per team — with their total volume and market count. Get one event with every sub-market and its current probability, the whole field at a glance. Live, no key, nothing stored. Distinct from sports-betting-odds and price-feed APIs — this is Polymarket's money-backed event probabilities and its markets. Perfect for forecasting, trading-signal, news and analytics apps.

api.oanor.com/polymarket-api

Monte Carlo API

Live Monte-Carlo simulation for price and portfolio forecasting that quants, traders and planners run to model uncertainty — computed on demand and reproducibly, no key, nothing cached. Run a geometric-Brownian-motion simulation of an asset and get the terminal-price distribution (percentiles, mean, probability of a gain); get the modelled chance of reaching a target price; project wealth over many years with periodic contributions (a retirement / savings projection); and return one sample price path for charting. Every run is seeded, so the same inputs always give the same numbers. A forward-looking simulation engine, distinct from historical-statistics and option-pricing tools — it turns a drift and volatility into a distribution of outcomes.

api.oanor.com/montecarlo-api

Earned Value Management API

Earned Value Management (EVM) maths as an API, computed locally and deterministically — the project cost-and-schedule controls used in PMP, PRINCE2 and government contracting. The metrics endpoint takes the budget at completion (BAC), planned value (PV), earned value (EV) and actual cost (AC) — or a percent-complete and planned-percent of BAC — and returns the cost variance (CV = EV−AC), schedule variance (SV = EV−PV), the cost and schedule performance indices (CPI = EV/AC, SPI = EV/PV), the percent complete and spent, and a plain-language over/under-budget and ahead/behind-schedule read. The forecast endpoint projects the finish: the estimate at completion by three standard methods (BAC/CPI when the cost trend continues, AC + remaining budget, and the cost-and-schedule AC + (BAC−EV)/(CPI·SPI)), the estimate to complete (ETC), the variance at completion (VAC) and the to-complete performance index (TCPI) to land on either the original budget or the EAC. A CPI of 0.875 on a 1000 budget forecasts a 1143 overrun. Everything is computed locally and deterministically, so it is instant and private. Ideal for project-management, PMO, construction, aerospace and contracting app developers, project dashboards and earned-value reporting tools, and PMP/PRINCE2 training. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 2 compute endpoints. This is earned-value project control; for loan or NPV cash-flow maths use a finance API.

api.oanor.com/earnedvalue-api

SuperTrend & Trend-Following API

Live trend-following indicators that traders run to ride a trend and time its turn, computed on demand from the OHLC candles you pass in — no key, no cache, nothing stored. The supertrend endpoint returns the SuperTrend line, the ATR-banded trailing level that sits below price in an uptrend (acting as support) and above it in a downtrend (acting as resistance) and flips when a close crosses it, with the current trend. The aroon endpoint returns Aroon Up, Aroon Down and the Aroon Oscillator, which measure how recently the highest high and lowest low were made — a reading of 100 means it just happened — to tell you how fresh and strong the trend is. The vortex endpoint returns the Vortex Indicator's VI+ and VI- lines, whose crossover is a classic trend-change signal. These are trend-following indicators, deliberately distinct from the ADX, Parabolic SAR and Donchian set and from momentum, volatility and volume tools: they each use the high, low and close to follow a trend and flag its reversal with their own formula. Works for any market — forex, stocks, crypto or commodities — because you supply the candles. Computed locally and deterministically, so it is instant and private. Ideal for trend-following bots, signal dashboards and back-tests. SuperTrend defaults to period 10 multiplier 3; Aroon to 25; Vortex to 14. Live, nothing stored. 3 compute endpoints. For ADX/Parabolic-SAR/Donchian use a trend-indicators API; for RSI/MACD use a technical-indicators API.

api.oanor.com/supertrend-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Manifold API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Manifold API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Manifold API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Manifold API cost?
Manifold API has a free tier with 100 calls / month. Paid plans start at €9.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Manifold API GDPR-compliant?
All requests to Manifold API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/manifold-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/manifold-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/manifold-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/manifold-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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