PolyBridge
REMOTE · MCP.POLYBRIDGE.AI · SCANNED SEP 24
Calibrated probabilistic foresight for AI agents, powered by live prediction-market signal.
Available components
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 not fully verified: no authorisation is required to call this server, and 2 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- 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 Usability80
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 315 tokens (~157/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the PolyBridge MCP server?
PolyBridge is a hosted endpoint at https://mcp.polybridge.ai/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 · mcp.polybridge.ai
claude mcp add --transport http crowdvector-polybridge-mcp 'https://mcp.polybridge.ai/mcp'
{
"mcpServers": {
"crowdvector-polybridge-mcp": {
"url": "https://mcp.polybridge.ai/mcp"
}
}
} {
"servers": {
"crowdvector-polybridge-mcp": {
"type": "http",
"url": "https://mcp.polybridge.ai/mcp"
}
}
} [mcp_servers.crowdvector-polybridge-mcp] url = "https://mcp.polybridge.ai/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"crowdvector-polybridge-mcp": {
"type": "remote",
"url": "https://mcp.polybridge.ai/mcp",
"enabled": true
}
}
} openclaw mcp add crowdvector-polybridge-mcp --url 'https://mcp.polybridge.ai/mcp' --transport streamable-http
mcp_servers:
crowdvector-polybridge-mcp:
url: "https://mcp.polybridge.ai/mcp" {
"McpServers": {
"crowdvector-polybridge-mcp": {
"Transport": "http",
"Url": "https://mcp.polybridge.ai/mcp"
}
}
} assistant mcp add crowdvector-polybridge-mcp -t streamable-http -u 'https://mcp.polybridge.ai/mcp'
{
"mcpServers": {
"crowdvector-polybridge-mcp": {
"type": "http",
"url": "https://mcp.polybridge.ai/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 26 Aug 26 79
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 7 Aug 26 0
- The server no longer declares the “experimental” capability functional
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Jul 26 0
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 24 Sept 2026 · Probed https://mcp.polybridge.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=mcp.polybridge.ai | CN=WR3,O=Google Trust Services,C=US | 2 Sept 2026 | 1 Dec 2026 | RSA 2048 | SHA256-RSA | 3d2ab80161d4d11009d6d546b94c330a |
| SANs: mcp.polybridge.ai | ||||||
| CN=WR3,O=Google Trust Services,C=US (CA) | CN=GTS Root R1,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | RSA 2048 | SHA256-RSA | 7ff005a91568d63abc22861684aa4b5a |
| CN=GTS Root R1,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 19 Jun 2020 | 28 Jan 2028 | RSA 4096 | SHA256-RSA | 77bd0d6cdb36f91aea210fc4f058d30d |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.polybridge.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 3799 | 8 | Verified |
| polybridge.ai. | 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://mcp.polybridge.ai/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.polybridge.ai/mcp | HTTPS enforced | 302 | https://mcp.polybridge.ai/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 →
polybridge_forecast PolyBridge Forecast ~109
Generate a read-only probability forecast for a clearly stated future event by searching relevant prediction markets and synthesizing evidence. Use when the user asks for a probability, outlook, or forecast; use polybridge_search when they only need market discovery. Does not place trades, provide financial advice, or access private/internal data.
| Name | Type | Req | Description |
|---|---|---|---|
| include_graph | boolean | – | Whether to include the causal graph in the structured response. |
| question | string | yes | Clearly stated future-event forecasting question, 500 characters or fewer. |
| Name | Type | Req | Description |
|---|---|---|---|
| causal_graph | – | – | – |
| confidence | number | yes | – |
| confidence_interval | – | – | – |
| distribution | – | – | – |
| engine_type | – | yes | – |
| error | – | – | – |
| latency_ms | integer | yes | – |
| markets_used | array | yes | – |
| metadata | object | – | – |
| probability | – | – | – |
| question | string | yes | – |
| reasoning | string | yes | – |
| request_id | string | yes | – |
No examples provided.
polybridge_search PolyBridge Search ~148
Search public prediction markets for markets relevant to a natural-language topic or question. Use when you need candidate markets, market URLs, outcomes, statuses, and relevance scores. Do not use for a final probability forecast, market-history lookup, trading, or private/internal data. Scores are relevance scores, not probabilities.
| Name | Type | Req | Description |
|---|---|---|---|
| dimensions | array | – | Search dimensions to run. Uses all supported dimensions by default. |
| filters | – | – | Optional market filters. Currently only filters.status is supported, with active, closed, or resolved. |
| query | string | yes | Natural-language topic or question to match to public markets. |
| top_k_per_dimension | integer | – | Maximum number of candidate markets to return per search dimension. |
| Name | Type | Req | Description |
|---|---|---|---|
| dimensions_returned | array | yes | – |
| query | string | yes | – |
| request_id | string | yes | – |
| results | array | yes | – |
| total_markets | integer | yes | – |
| warnings | array | – | – |
No examples provided.
What is the PolyBridge MCP server?
PolyBridge is an MCP server listed in the public MCP registry as io.github.crowdvector/polybridge-mcp. Calibrated probabilistic foresight for AI agents, powered by live prediction-market signal. This page covers its hosted endpoint (https://mcp.polybridge.ai/mcp).
Is the PolyBridge MCP server safe to use?
PolyBridge scores 79 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 PolyBridge MCP server expose?
PolyBridge exposes 2 tools: polybridge_search, polybridge_forecast. Their descriptions and schemas cost roughly 257 tokens of context every time the server is loaded.
Does the PolyBridge MCP server require authentication?
No. We connected to PolyBridge without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the PolyBridge MCP server still maintained?
PolyBridge is still listed as active in the MCP registry. We last reached this channel on 24 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.