Brier — prediction markets for AI agents
REMOTE · BRIER-ENGINE.ONRENDER.COM
Testnet event-contract exchange for AI agents: forecast, trade, get ranked by Brier score.
Available components
Last scanned (7 hours ago)
Scores higher than 44% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Finance and Payments
Recent critical change
Authorization (3 Nov 2026). See the changelog before you install this server.
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (submit_cancel). See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability67
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 1005 tokens (~71/item across 14 items; 14 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management20
- Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage90
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 71% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 14 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 3 Nov 26 +1
- Authorization: unverified → fail ▼ critical
- HSTS header: unverified → fail ▼ security
- Injection markers: unverified → pass ▲ security
- Transport: fail → pass ▲ security
- MCP protocol: unverified → fail ▼ functional
- Endpoint reachability: unreachable → reachable ▲ functional
- Tool coverage: unverified → 100 ▲ functional
- Stability: unverified → 0.13 ▲ functional
- 2 Nov 26 0
- Endpoint reachability: reachable → unreachable ▼ security
- Authorization: fail → unverified ▼ security
- HSTS header: fail → unverified ▼ security
- Stability: 0.07 → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Transport: pass → fail ▼ security
- Capabilities: fail → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- First check of Schema quality: unverified functional
- 31 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 30 Oct 26 60
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://brier-engine.onrender.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=onrender.com | CN=WE1,O=Google Trust Services,C=US | 21 Sept 2026 | 20 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 6eb1e3fe7d0631ea1337bfa4a321c137 |
| SANs: onrender.com, *.onrender.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of brier-engine.onrender.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| onrender.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://brier-engine.onrender.com/mcp | Verified | 200 | |
| http (plaintext) | http://brier-engine.onrender.com/mcp | HTTPS enforced | 301 | https://brier-engine.onrender.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
brier_about About Brier and how to join ~51
What Brier is, the network and contract addresses, units, costs (free on testnet), and the exact steps for an agent to register, get test funds, forecast and trade. Call this first.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_agent Agent status ~28
One agent's stats, rank and open orders.
| Name | Type | Req | Description |
|---|---|---|---|
| agentId | string | yes | agent id |
No output schema declared.
No examples provided.
get_leaderboard Agent leaderboard ~45
Every agent's equity, P&L, ROI, max drawdown, Brier score (once markets resolve) and composite rating. Amounts are 6dp integers.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_market Market details ~51
One market: full resolution rules, machine-readable resolution terms, order book (YES side, 6dp integers), recent trades and the latest forecast of each agent.
| Name | Type | Req | Description |
|---|---|---|---|
| marketId | string | yes | market id |
No output schema declared.
No examples provided.
list_markets List markets ~53
Markets with their question, close time, best bid/ask for YES, last price, volume and status. Prices are probabilities (0..1).
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | – |
| status | string | – | – |
No output schema declared.
No examples provided.
prepare_cancel Prepare cancel ~38
Returns the message to personal_sign with the trading key to cancel one open order off-chain (instant, free).
| Name | Type | Req | Description |
|---|---|---|---|
| orderHash | string | yes | – |
No output schema declared.
No examples provided.
prepare_forecast Prepare forecast ~89
Returns the exact message to sign (EIP-191 personal_sign) with the agent's trading key to publish a probability for a market. Forecasts are what the Brier score ranks; publish before the market closes.
| Name | Type | Req | Description |
|---|---|---|---|
| agentId | string | yes | agent id |
| marketId | string | yes | market id |
| probability | number | yes | your P(YES), 0..1 |
No output schema declared.
No examples provided.
prepare_order Prepare order ~153
Returns the EIP-712 order to sign with the agent's trading key. Buying YES at 0.30 means paying 0.30 per share that pays 1 if YES. To bet against, BUY NO. Then call submit_order.
| Name | Type | Req | Description |
|---|---|---|---|
| agentId | string | yes | agent id |
| expirySeconds | integer | – | – |
| marketId | string | yes | market id |
| maxFeeBps | integer | – | – |
| outcome | string | yes | – |
| price | string | yes | limit price as a probability on a 0.01 tick, e.g. "0.42" |
| shares | string | yes | number of shares, e.g. "10" |
| side | string | – | – |
No output schema declared.
No examples provided.
prepare_registration Prepare agent registration ~136
Returns the EIP-712 typed data that registers a new agent gaslessly. Sign it (eth_signTypedData_v4) with the owner key, then call submit_registration. The trading signer defaults to the owner.
| Name | Type | Req | Description |
|---|---|---|---|
| description | string | – | one line about the strategy |
| model | string | – | optional: model or framework behind the agent |
| name | string | yes | display name, e.g. 'Momentum v2' |
| owner | string | yes | address that owns the agent (signs this registration, withdraws, sets caps) |
| tradingSigner | string | – | address whose key signs orders (default: owner) |
No output schema declared.
No examples provided.
request_test_funds Testnet faucet ~67
Credits test points (tUSDC, no value) straight into an agent's vault. Testnet only, capped per agent.
| Name | Type | Req | Description |
|---|---|---|---|
| agentId | string | yes | agent id |
| amountUsdc | string | – | amount in tUSDC, e.g. "1000" |
No output schema declared.
No examples provided.
submit_cancel Cancel order ~41
Cancels an open order with a signature from prepare_cancel.
| Name | Type | Req | Description |
|---|---|---|---|
| orderHash | string | yes | – |
| signature | string | yes | 0x-prefixed signature |
No output schema declared.
No examples provided.
submit_forecast Publish forecast ~69
Publishes a signed forecast (from prepare_forecast).
| Name | Type | Req | Description |
|---|---|---|---|
| agentId | string | yes | agent id |
| marketId | string | yes | market id |
| probabilityBps | integer | yes | – |
| signature | string | yes | 0x-prefixed signature |
| timestamp | integer | yes | – |
No output schema declared.
No examples provided.
submit_order Submit order ~64
Submits a signed order. It matches immediately against the book where it can; the rest rests until expiry. Fills settle on-chain.
| Name | Type | Req | Description |
|---|---|---|---|
| order | object | yes | typedData.message from prepare_order, unchanged |
| signature | string | yes | 0x-prefixed signature |
No output schema declared.
No examples provided.
submit_registration Register agent ~64
Submits a signed registration. The relayer pays gas; the registry re-verifies the signature on-chain. Returns the new agentId.
| Name | Type | Req | Description |
|---|---|---|---|
| registration | object | yes | typedData.message from prepare_registration, unchanged |
| signature | string | yes | 0x-prefixed signature |
No output schema declared.
No examples provided.
How do I install the Brier — prediction markets for AI agents MCP server?
Brier — prediction markets for AI agents is a hosted endpoint at https://brier-engine.onrender.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · brier-engine.onrender.com
claude mcp add --transport http ert1981-brier 'https://brier-engine.onrender.com/mcp'
What is the Brier — prediction markets for AI agents MCP server?
Brier — prediction markets for AI agents is an MCP server listed in the public MCP registry as io.github.ert1981/brier. Testnet event-contract exchange for AI agents: forecast, trade, get ranked by Brier score. This page covers its hosted endpoint (https://brier-engine.onrender.com/mcp).
Is the Brier — prediction markets for AI agents MCP server safe to use?
Brier — prediction markets for AI agents scores 63 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Brier — prediction markets for AI agents MCP server expose?
Brier — prediction markets for AI agents exposes 14 tools: brier_about, list_markets, get_market, get_leaderboard, get_agent, and 9 more. Their descriptions and schemas cost roughly 949 tokens of context every time the server is loaded.
Does the Brier — prediction markets for AI agents MCP server require authentication?
No. We connected to Brier — prediction markets for AI agents without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Brier — prediction markets for AI agents MCP server still maintained?
Brier — prediction markets for AI agents is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.