Gravia.trade review

Updated 2026 · Independent · Contains referral links

What Gravia actually is

Prediction markets have exploded, but the tooling around them still looks like a betting slip. Gravia positions itself as the intelligence layer: it ingests Polymarket and Kalshi markets, indexes the positions of roughly 2.95 million traders, and turns that history into filters you can query in seconds. On top of that sits an execution surface designed for ultra-short crypto binaries — the 5-minute BTC and ETH Up/Down contracts that are impossible to trade well on a generic event-market UI.

Critically, Gravia is not an exchange. It does not custody funds and it does not create the markets. Your position is on the underlying venue; Gravia is the screen you look at and the router you click through.

Features that matter

1. A chart that shows the settlement price

The chart panel plots Binance and Coinbase feeds alongside the Chainlink spot mark and, most importantly, the TWAP 30s and TWAP 60s resolution lines. Short-dated binaries do not settle on the last trade you saw — they settle on a time-weighted average, and Gravia draws it live with the countdown to the next resolution. That single detail removes the most common way traders lose a 5-minute contract they thought they had won.

2. Polymarket book next to the CEX book

The order book shows price, shares and cumulative total on both sides of the Up/Down market, with the last trade and current spread on top — typically 1¢ on the front market, with thousands of shares stacked at 99¢. Flipping to the CEX tab puts the spot book beside it, so a dislocation between the binary and spot is visible rather than inferred.

3. Smart Analysis: who is in this market right now

A ranked table of every trader in the live contract: side, net exposure, Up and Down share counts, average entry in cents, PnL in this market, all-time PnL, and how long ago they entered — down to seconds. Names link straight to a full trader profile. It is the closest thing to seeing the other side of your trade before you take it.

4. Live tape with mempool visibility

A rolling 100-trade feed with shares, price in cents, USD size and the fee charged, plus two separate timestamps: when the trade was spotted in the mempool and when it confirmed on chain. Watching the mempool column is a genuine information edge on a five-minute clock.

5. Trader profiles, markouts and counterparties

Any wallet or Polymarket username opens a profile: portfolio split into cash and positions, buy versus sell volume, total PnL net of fees, win rate, and tabs for Positions, Activity, Categories, Analytics and Counterparties. Trades are scored with trade-tape markouts — hypothetical PnL at a fixed horizon after each fill — and grouped by economic counterparty, which separates real edge from repeatedly trading against one slow taker.

6. A documented API, not a closed box

Gravia publishes a REST and WebSocket reference at docs.gravia.trade: current Up/Down market, price-to-beat, market categories, user trades and activities, positions, category metrics, taker tier, plus streams for Chainlink prices and live trades including unconfirmed mempool rows. Bot builders can consume exactly what the terminal renders.

Access and pricing

Gravia is free. Not freemium with a hidden wall — the developer documentation has a pricing page whose entire content is “It’s free, there ain’t no pricing.” There is no subscription for the terminal and no charge for the Data API during its beta, which is rate-limited to 100 requests per minute per key with a Retry-Afterheader on 429 responses.

What you do pay is the market. A fill in the live tape reads like this: 40 Up shares at 99¢ for $39.60 with a $0.03 fee; a 25-share Down buy at 1¢ costs $0.25 with no fee at all. Add the 1¢ spread and that is your entire cost base. There is no per-trade Gravia markup to hunt for.

Entry is still gated. The terminal wants an access code or an invite link, and API keys are issued through a ticket in the #access-code channel of the Gravia Discord, granted in cohorts while the API matures. The invite link is the faster path — it opens the access flow instead of asking for a code you do not have. Full breakdown on our Gravia pricing page, and the reference itself is at docs.gravia.trade.

Is Gravia safe?

Two separate questions get mixed up here. The first is custody risk: Gravia does not hold your funds, so the failure mode is a bad UI or a stale price, not an exit scam with your balance. The second is domain trust: automated scanners rate gravia.trade poorly because the domain is new and traffic is low. That is a statement about age, not about behaviour.

The honest risk is product maturity. It is early software on volatile markets. Size accordingly, verify prices against the venue when a number looks wrong, and never trade a 5-minute binary with money you need.

Who should use it

• Active prediction-market traders who already use Polymarket or Kalshi weekly
• Scalpers who want a real ladder for 5-minute crypto binaries
• Researchers who want wallet-level history rather than a leaderboard
• Cross-venue traders arbitraging Polymarket against Kalshi pricing

If you place two event bets a month, stay on the native venue — the terminal is overkill.

Verdict

Gravia is the most opinionated attempt yet at a professional cockpit for prediction markets. The data layer is its real product and it is deeper than anything native to Polymarket. The caveats are ordinary early-stage caveats: gated onboarding, limited history, and a market category that is still finding its regulatory shape. If you trade this space actively, it is worth the ten minutes it takes to get in.

FAQ

Keep reading

• Gravia vs Polymarket
• How to start on Gravia step by step
• Kelly position-size calculator