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OpenBoss MCP Server

answering

OpenBoss is answering right now. Last checked 7 min ago. It exposes 9 tools. Last commit 29 Aug 2026.

Public internet HP bar. Agents smack it over MCP. They cannot complete payment.

Uptime history 12 days of history
12 days agonow
100.0%
Uptime 24h
92 of 92 checks
9
Tools
read from the server
282 ms
Response time
average over 24h
0
Stars
last commit 29 Aug 2026

Nothing serious here today

Today is the operative word: we check OpenBoss every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

run in your terminal
claude mcp add openboss --transport http https://api.openboss.lol/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "openboss": {
      "url": "https://api.openboss.lol/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.openboss]
url = "https://api.openboss.lol/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "openboss": {
      "url": "https://api.openboss.lol/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "openboss": {
      "url": "https://api.openboss.lol/mcp"
    }
  }
}

Available tools 9

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

boss
get_boss
Return the world boss everyone is currently hitting: its name, lore, tier, current and maximum hit points, active affixes, the live momentum multiplier, and how much damage has been dealt. Use this to answer "what is the boss right now", "how much health is left", or before deciding whether to smack it. One boss exists at a time and everyone in the world shares it.
checkout
create_checkout
Open a Stripe Checkout Session for one smack pack and return its URL. THIS DOES NOT PAY — hand the URL to the person, who opens it and enters their own card. That page is where they are told smacks are not refundable and that there are no prizes and no payouts, which is why it cannot be skipped. Then poll check_purchase with the returned sessionId until it reports paid, and you get a walletToken to spend with smack_boss. Pass an existing walletToken to top that same wallet up instead of starting a new one.
graveyard
get_graveyard
Return bosses that have already been killed, newest first, each with the display name of whoever landed the killing blow. That engraving is permanent and is the only thing anyone actually wins. Use this for "who has killed a boss", "how many bosses have died", or to look up a past boss.
leaderboard
get_leaderboard
Return the damage leaderboard for the current boss — display names and total damage, highest first — together with the most recent hits. Use this to answer "who is winning", "who has done the most damage", or to see whether a particular name is on the board. Resets when the boss dies.
packs
list_packs
Return every smack pack for sale: id, price in US dollars, how many smacks it buys, and any bonus. Call this before create_checkout so you can tell the person what they are about to pay. Prices are final — no VAT or tax is added at checkout. Also reports the free allowance, so you can mention that trying it costs nothing.
pixel
get_pixel
Return the current state of The Pixel (thepixel.lol): who owns it, what they paid, its colour, the minimum price to take it, and recent ownership history. Use this for "who owns the pixel" or "what would it cost to buy it". BUYING IT IS NOT AVAILABLE AS A TOOL — a purchase needs a person at the payment page, because a bid that loses a simultaneous takeover is charged in full and refunds nothing. Send the human to https://thepixel.lol to buy.
purchase
check_purchase
Given the sessionId from create_checkout, report whether the person has paid yet. Once paid, returns a walletToken and the smack balance it holds — pass that token to smack_boss to spend it. Poll every few seconds after sending someone to the checkout URL; card payments settle asynchronously, so "not paid yet" shortly afterwards is normal rather than a failure. Keep the walletToken: it IS the wallet, there is no account behind it, and whoever holds it holds the smacks.
smack
smack_boss
Land one smack on the current boss and return the damage dealt and the remaining hit points. One swing per call — call it repeatedly to keep hitting. PAID: pass walletToken (from check_purchase) to spend one smack from that wallet. Paid hits are the real thing — they can crit, they take the momentum multiplier, and only a paid hit can land the killing blow and put a name on the grave forever. FREE: pass visitorId instead and it costs nothing. Three per visitorId — the count is held for about thirty days — then FREE_EXHAUSTED, which is the limit working and not a fault. It is NOT an hourly allowance: waiting does not give them back. A free smack can never land the killing blow and free damage is capped per boss, so the engraving stays with somebody who paid for it. Pass one or the other. If both arrive, the wallet is spent.
wallet
get_wallet
Return the smack balance held by a walletToken. Use it to decide whether to keep smacking or to buy another pack.

Endpoints

URLTransportStateLatencyChecked
https://api.openboss.lol/mcp streamable-http answering 2730 ms 7 min ago

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OpenBoss — questions

Answers built from our own checks of this server.

What can OpenBoss do?
It exposes 9 tools, read directly from the server on our last check. Among them: check_purchase, create_checkout, get_boss, get_graveyard, get_leaderboard, get_pixel and 3 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is OpenBoss working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 282 ms. The bar chart above shows every period we have measured.
How do I connect OpenBoss?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does OpenBoss need an API key?
No. OpenBoss completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 9 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is OpenBoss?
It answers our handshake in 282 ms on average, which is faster than 56% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is OpenBoss open source?
Yes — it is published under the MIT licence and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.