About rot.rocks

What rot.rocks is

rot.rocks is a free trading platform purpose-built for the Roblox game Steal a Brainrot. It lets players post trade offers, value items at the current market floor, run the numbers in a calculator, and compare offers across mutations and traits — all without dealing with Discord screenshot trades or guessing at prices.

Every brainrot, mutation, and trait on the site has a stable identity in our database, a continuously-refreshed Robux value, and a demand/trend signal so users can tell at a glance whether a trade is fair, lopsided, or over-paying.

Where the data comes from

rot.rocks values are not hand-picked. They are derived from real listings on the third-party marketplaces players actually use to buy and sell brainrots. Our primary data source is Eldorado.gg, the largest open marketplace for Steal a Brainrot accounts and items. We also pull supplementary metadata (rarity tiers, mutation definitions, in-game cost and base income) from the official Steal a Brainrot wiki.

How the Eldorado scraper works

Eldorado exposes a public listing API per item. Our scraper:

1. Fetches Eldorado’s library endpoint to get the canonical list of every brainrot the marketplace currently recognizes. We map each entry to our own database by name and slug, and flag any new brainrots that have appeared.
2. For each known brainrot, we issue a per-item search request that filters listings by the brainrot name and any mutation attribute. This returns the active offers (price, mutation, listing age, seller) at the time of scrape.
3. Listings are deduped, capped per item, and persisted to a snapshot table. We never overwrite a previous value — every snapshot is appended so the price history chart on each brainrot detail modal is built from real, time-stamped marketplace data.
4. After the raw snapshot is stored, an admin reviews the diff before it is applied to the public values. This human-in-the-loop step exists specifically to catch obviously wrong scrapes (a single seller dumping a mispriced item, a marketplace bug, a brand-new listing that hasn’t found its true floor yet).

The scraper runs on a recurring schedule, and a typical accepted snapshot updates several hundred brainrot/mutation combinations at once. All listings are public information — we don’t track sellers or buyers, and we don’t republish anything beyond the price floor we observed.

How values are calculated

Each brainrot can exist in multiple mutation variants (Default, Gold, Diamond, Rainbow, Galaxy, etc.), and each variant has its own market value. Our valuation pipeline has four layers, applied in order:

1. Floor extraction

For every (brainrot, mutation) pair we observe, we take the lowest current asking price from Eldorado as the floor. This is what someone could realistically buy the item for right now, not an inflated “wishlist” number.

2. Floor interpolation

Rare mutations don’t always have a live listing. When a brainrot has Default and Gold listed but no Diamond, we don’t leave Diamond blank — we sort that brainrot’s observed mutations by their official multiplier (Default 1×, Gold 1.25×, Diamond 1.5×, Rainbow 10×, etc.) and interpolate the missing tiers from the surrounding ones. When two mutations share the same multiplier (Rainbow and Divine are both 10×), a stable tiebreaker keeps the order deterministic. The result: every active mutation gets a defensible value even when the marketplace is thin for that variant.

3. Trait amplifiers

Traits stack additively on top of the brainrot’s base value. A trait with valueMultiplier = 1.5 contributes +50% to the base value; a debuff trait like Taco at 0.9 contributes −10%. Multiple traits stack additively (two +50% traits = +100%, i.e. 2× total), with a small overlap deduction applied when more than one trait is present. This matches how the in-game economy actually behaves and avoids the “multiplicative explosion” problem that other community calculators run into.

4. Demand & trend signals

Every brainrot and (brainrot, mutation) combination carries two extra signals:

• Demand: Low / Normal / High — derived from listing volume, time-on-market, and recent sale velocity.
• Trend: Lowering / Stable / Rising — computed from the slope of the recent price snapshots.

These are surfaced as small icons on every trade card, the calculator, and individual brainrot detail pages so traders can see when a price looks right on paper but the market is moving against them.

When values look stale or volatile

When a price hasn’t been refreshed in a while (because the item is rare and rarely listed), it’s flagged as stale on the brainrot detail view. When a value jumps more than the rarity-specific volatility threshold — 20% for Secret-tier items, 30% for OG-tier — the entry is flagged as volatile, with the previous value preserved in tooltip form so you can see what jumped.

These flags are intentional friction: we’d rather show you a number that comes with a caveat than pretend a thinly-listed item has a confident price. If you see “N/A” on a brainrot, it means we don’t have any defensible data for that variant yet.

Update cadence

Eldorado snapshots are scraped on a recurring schedule. Each snapshot is held in a review queue before it’s pushed to public values, which keeps the marketplace data clean even when Eldorado has a single outlier listing. Between scrapes, the brainrot list, trade cards, calculator, and price-history charts are all served from the most recently applied snapshot, so what you see on rot.rocks reflects the actual marketplace within minutes of a refresh.

The brainrot roster itself (rarity, base income, in-game cost, mutation list) is refreshed against the official Steal a Brainrot wiki on a separate cadence, so when the game adds a new brainrot or a new mutation rolls out, it shows up here without anyone having to manually enter it.

Trust and transparency

• Not affiliated with Roblox Corporation, the developers of Steal a Brainrot, or Eldorado.gg. rot.rocks is an independent fan-run trading platform.
• No paid placements. Trades are sorted by recency. Users can’t pay to make a trade more visible or push a brainrot value up or down.
• Prices are observable. Every value we display is traceable back to a real Eldorado listing snapshot. If a number looks off, the in-app price history chart shows the data points that produced it.
• No private data sold. See our Privacy Policy for the full detail. Roblox usernames are public on the platform; nothing else about you is shared with third parties.
• Community moderation. Trade votes (fair / unfair) come from real verified Roblox users, weighted to limit ballot stuffing. Repeat offenders are removed.

Tools we built around the data

• Trade marketplace — post a trade, see what others are offering, vote on fairness, counter-offer.
• Trade calculator — build two trade sides and see the value delta in Robux and USD before you commit.
• Brainrot directory — every brainrot with current values across all mutations, plus the price history chart.

Contact and feedback

Spotted a bad price, a missing brainrot, or a calculation that doesn’t match the in-game value? Reach out via hello@rot.rocks or flag it directly from the trade card. Reports are reviewed by a human, not a bot.