Otr Protocol MCP Server

@otr-protocol/validator

Merchant trust verification for AI agents. One call = trust score, badge, and purchase safety.

1 1/wk 2 tools GitHub npm

No known CVEs

MIT license

Maintained

Last commit 149d ago

Works with most clients

Transport: stdio, sse, http

2 tools · ~269 tok

Grade A · 0.1% of 200K ctx

MCPpedia last refreshed this data 16h ago

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Otr Protocol MCP Server is an MCP server that merchant trust verification for AI agents. One call = trust score, badge, and purchase safety. Its tool list has not been published yet over stdio, sse and http, requires no API key, and scores 79/100 on MCPpedia's security, maintenance and efficiency rubric.

Security E-Commerce

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "otr": {
      "args": [
        "@otr-protocol/mcp-server"
      ],
      "command": "npx"
    }
  }
}

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[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-yb48666-ctrl-otr-protocol)](https://mcppedia.org/s/io-github-yb48666-ctrl-otr-protocol)

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What Otr Protocol MCP Server does

AI agents are increasingly making purchase decisions on behalf of consumers. The agentic commerce stack is taking shape -- but there is a critical missing layer:

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@otr-protocol/validator' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

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Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

79/100across 5 weighted dimensions

How we score →

0255075100

−21

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @otr-protocol/validator against OSV.dev.

Inventory

Tools (2)

Click any tool to inspect its schema.

~269 tokens total

Community

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Frequently Asked Questions

Is Otr Protocol MCP Server safe to use?: Otr Protocol MCP Server has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Otr Protocol MCP Server?: Otr Protocol MCP Server supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Otr Protocol MCP Server do?: Otr Protocol MCP Server provides 2 tools: verify_merchant, search_registry. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Otr Protocol MCP Server?: Otr Protocol MCP Server is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Otr Protocol MCP Server actively maintained?: Otr Protocol MCP Server is less actively maintained — last commit was 149 days ago. It has 1 GitHub stars.

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Community

Discussion

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

The Problem

AI agents are increasingly making purchase decisions on behalf of consumers. The agentic commerce stack is taking shape -- but there is a critical missing layer:

┌──────────────────────────────────────────────────────────────────┐ │ AI Agent Commerce Protocol Stack │ ├──────────────────────────────────────────────────────────────────┤ │ │ │ Visa TAP ·············· Agent Identity Verification │ │ Google UCP ············ Structured Data Exchange │ │ Stripe ACP ············ Payment Processing │ │ │ │ ┌───────────────────────────────────────────────────────────┐ │ │ │ OTR Protocol ····· MERCHANT TRUST VERIFICATION ◀━━━━━ │ │ │ │ "Is this merchant safe to buy from?" │ │ │ └───────────────────────────────────────────────────────────┘ │ │ │ │ Visa TAP answers "Who is the AI agent?" │ │ Google UCP answers "What products are available?" │ │ Stripe ACP answers "How do I pay?" │ │ OTR answers "Should I trust this merchant?" ◀━━ ONLY OTR │ │ │ └──────────────────────────────────────────────────────────────────┘

Without OTR, AI agents operate blind -- unable to distinguish a legitimate retailer from a sophisticated scam site. This exposes consumers to fraud and erodes trust in the entire agentic commerce ecosystem.

The Solution

OTR (Open Trust Registry) provides deterministic, verifiable merchant trust scores using 6 verification dimensions, a 10-layer anti-fraud pipeline (Layer 0: Google Web Risk one-vote veto + Layers 1-9: core detection engine), and three-layer immutable audit trail. It is fully open-source (MIT), machine-readable, and designed from the ground up for AI agent consumption.

Key Properties

Deterministic -- Same inputs always produce identical outputs. Any validator can reproduce any score.

Verifiable -- All data sources are publicly accessible. No hidden factors or proprietary signals.

Unforgeable -- Verification dimension weighted at 40% in public assessment. SEC filings, Wikidata entries, and 10-year domain age cannot be faked.

Tamper-proof -- SHA-25

Frequently Asked Questions

Is Otr Protocol MCP Server safe to use?

Otr Protocol MCP Server has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.

How do I install Otr Protocol MCP Server?

Otr Protocol MCP Server supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can Otr Protocol MCP Server do?

Otr Protocol MCP Server provides 2 tools: verify_merchant, search_registry. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Otr Protocol MCP Server?

Otr Protocol MCP Server is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is Otr Protocol MCP Server actively maintained?

Otr Protocol MCP Server is less actively maintained — last commit was 149 days ago. It has 1 GitHub stars.

The Problem

AI agents are increasingly making purchase decisions on behalf of consumers. The agentic commerce stack is taking shape -- but there is a critical missing layer:

The Solution

Key Properties

Deterministic -- Same inputs always produce identical outputs. Any validator can reproduce any score.

Verifiable -- All data sources are publicly accessible. No hidden factors or proprietary signals.

Unforgeable -- Verification dimension weighted at 40% in public assessment. SEC filings, Wikidata entries, and 10-year domain age cannot be faked.

Tamper-proof -- SHA-25