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Collar Guardrail — Pre-Trade Risk Layer

by aiguardrailversion 1.0.5i★ –iRuns in the cloud
Registry nameio.github.aiguardrail/backend

Install

Overview

Description from the maker (original English)

Deterministic pre-trade risk checks for AI agents on Robinhood Chain. Returns allow/warn/deny.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 1 of 1 passed
  • Runs on the maker’s server: what you ask it goes through their server.
  • The registry lists no key to fill in.

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://api.collarguardrail.com/mcp-http/mcp

Run this in your terminal

claude mcp add --transport http backend https://api.collarguardrail.com/mcp-http/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "backend": {
      "url": "https://api.collarguardrail.com/mcp-http/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "backend": {
      "type": "http",
      "url": "https://api.collarguardrail.com/mcp-http/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://api.collarguardrail.com/mcp-http/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified with the GitHub account aiguardrail, which owns the repo

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • … Not checked yet

    Endpoint responds

    Not checked yet; we check endpoints in rotation

  • … Not checked yet

    Sign-in with OAuth

    Not checked yet; we check endpoints in rotation

  • … Not checked yet

    No hidden instructions in tool descriptions

    Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

  • More stars than 0% of the other 32680 servers in this category
  • Published to the registry more recently than 56% of the other 32680 servers in this category
  • Basic checks equal to or better than 100% of the other 32680 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Collar Guardrail — Pre-Trade Risk Layer safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.5) reached the registry 31 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, EmbeddedCI BenchPod

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Collar Guardrail

Deterministic pre-trade risk layer for AI agents on Robinhood Chain.

Collar evaluates proposed trades before execution and returns allow / warn / deny with reasons, a 0–100 risk score, and a tamper-evident SHA-256 audit hash.

Overview

Collar sits between an autonomous trading agent and the chain as a deterministic pre-trade checkpoint. Every proposed trade is scored against live oracle prices, market-hours rules, tier-based limits, slippage bounds, and contract-safety signals before it is allowed to proceed.

The result is a single, auditable verdict — never a probabilistic guess.

Endpoints

  • MCP Server: https://api.collarguardrail.com/mcp-http/mcp
  • MCP Server Card: https://api.collarguardrail.com/.well-known/mcp-server-card.json
  • Agent Card (A2A): https://api.collarguardrail.com/.well-known/agent-card.json
  • x402 Discovery: https://api.collarguardrail.com/.well-known/x402.json
  • Methodology: https://api.collarguardrail.com/methodology.html
  • Live Status: https://api.collarguardrail.com/status
  • Live Latency (p50/p95/p99): https://api.collarguardrail.com/latency.html
  • llms.txt: https://api.collarguardrail.com/llms.txt
  • Live Terminal (UI): https://collarguardrail.com

MCP Transport: streamable-http | Protocol: 2025-06-18 | Auth: none (fixed Tier 1)

Installation

Add to your MCP client config (Claude Desktop, Cursor, VS Code):

{

"mcpServers": { "collar-guardrail": { "url": "https://api.collarguardrail.com/mcp-http/mcp" } } } Verify:

bash curl -X POST https://api.collarguardrail.com/mcp-http/mcp \ -H "Content-Type: application/json" \ -H "Accept: application/json, text/event-stream" \ -d '{"jsonrpc":"2.0","method":"tools/list","id":1}' Available Tools Tool Purpose evaluate_trade Pre-trade risk check at fixed Tier 1 ($5,000 ceiling). Returns allow / warn / deny with reasons and audit hash. Honeypot findings (severity=danger) force a DENY. evaluate_trade_paid Same as evaluate_trade, gated by an x402 payment. Evaluated as Tier 2 ($25,000 ceiling). Call without payment_proof to receive the challenge; settle on-chain; retry with the proof. check_token_safety Honeypot / contract safety check for any ERC-20. When severity=danger, evaluate_trade auto-DENYs. simulate_balance Read-only balance simulation via eth_call state override get_supported_assets Official Robinhood Chain asset registry verify_audit_trail Verify the hash-chain integrity of past decisions Call get_supported_assets first to resolve a symbol to its canonical contract address. A mismatched address is treated as a fake-token attempt and denied.

The free evaluate_trade is capped at Tier 1 ($5,000). If you need Tier 2 ($25,000) without holding COLR, use evaluate_trade_paid — the on-chain x402 payment is the credential.

Capabilities Pricing

Chainlink oracle prices for 34+ Stock Tokens on Robinhood Chain

Uniswap V4 fallback when the oracle is stale, paused, or unconfigured

No fabricated fallback — if neither oracle nor V4 yields a price, verdict is deny

10-second V4 price cache

US Market Hours

Full US holiday calendar with observed-on-Friday/Monday shift

Early close on Thanksgiving Friday and Christmas Eve

Policy Enforcement

Tier system (REST API): 1,000 / 2,500 / 5,000 COLR → $5K / $25K / $100K limits

Per-tier rate limiting

Cluster-based rate limit and daily-loss guard (keyed on wallet fingerprint)

Slippage / MEV guard (hard 500 bps floor)

Idempotency via request_id (5-minute cache)

Global kill switch, contract mismatch detection, per-wallet blocklist

Contract Safety

Honeypot detection: bytecode scan, owner check, sell simulation via eth_call

Auto-DENY: when severity=danger, the verdict is deny regardless of other checks — a hard stop.

GoPlus intelligence for unregistered tokens (buy/sell tax, mintable, proxy, ownership reclaim).

Excessive tax (buy or sell > 10%) triggers an automatic deny via GoPlus when allow_unregistered=true is passed to the request.

Auth & Infrastructure

JWT authentication via EIP-191 wallet signature (REST API)

Auth rate limiting per IP (20 req/min)

WalletConnect v2 + EIP-6963 wallet discovery

200+ token registry

Hash-chained audit trail (audit_hash + audit_seq)

Observability

Public live status page — uptime, dependency health, known issues

Public latency dashboard — p50/p95/p99 per endpoint and per MCP tool

Public methodology — how the 0–100 score is computed

Public audit-chain verification

Payments (x402) Endpoint: POST /api/x402/analyze

Price: $0.10 USDG per call

Network: Robinhood Chain (eip155:4663)

Discovery: /.well-known/x402.json

Facilitator: Ultravioleta DAO

Listing: x402 Bazaar

No signup, no API key. Registered in the x402 Bazaar for automatic agent discovery.

Response Format json { "decision": "allow", "reasons": ["price source: oracle", "within tier 1 ceiling"], "tier": 1, "max_trade_usd": 5000, "calculated_notional_usd": 1452.30, "price_usd": 145.23, "price_source": "oracle", "risk_score": 12, "audit_hash": "sha256:...", "audit_seq": 12345, "daily_pnl_usd": 0.0 } decision: allow / warn / deny — deny is a hard stop

reasons prefixed with ADVISORY: are non-blocking

price_source: oracle / uniswap_v4 / fallback_default / unavailable

error: if present, no verdict was produced — treat as a hard stop

Discovery Files /.well-known/mcp-server-card.json — MCP tool schemas (canonical, flat)

/.well-known/mcp/server-card.json — alias (nested)

/.well-known/agent-card.json — A2A skills

/.well-known/x402.json — x402 payment resources

/.well-known/methodology.md — risk score methodology (agent-readable)

/.well-known/known-issues.json — public known-issues list

/methodology.html — methodology, human-readable

/mcp-card.html — rendered server card

/agent-card.html — rendered agent card

/latency.html — live latency dashboard

/status — live status page

/llms.txt — full API contract for LLM agents

/skill.md — concise skill index

/robots.txt — AI crawler allow-list

/sitemap.xml — site map

Registry Listings Official MCP Registry: io.github.aiguardrail/backend

Smithery: search "collar"

x402 Bazaar: /api/x402/analyze

Documentation Live Terminal (UI): https://collarguardrail.com

Agent Integration Guide: https://collarguardrail.com/agent-docs.html

MCP Server Card: https://api.collarguardrail.com/.well-known/mcp-server-card.json

Methodology: https://api.collarguardrail.com/methodology.html

Status: https://api.collarguardrail.com/status

Latency: https://api.collarguardrail.com/latency.html

Contact X (Twitter): @collarguardrail

Disclosure Collar is the risk layer for autonomous finance on Robinhood Chain. Deterministic, auditable, and independent.

COLR is our own utility token, issued and operated by the Collar team. It is not affiliated with, endorsed by, or issued by Robinhood Markets, Inc. or any Robinhood entity. Robinhood Chain is a public blockchain we build on — using it does not imply any relationship with Robinhood.

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