DecaData Odyssey Lite

by decadata.io · remote · no sign-in to list tools · v1.0.0 · published by io.decadata

US point-of-sale sales for ~380 consumer companies: free search and samples, YoY growth for $0.01

Final · 1

Compare Registry entry

4 tools: 1 do something that can't be undone and 3 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone1Claude Code: ask: see these tools
Changes things0Claude Code: ask
Only reads3Claude Code: allow: see these tools

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http odyssey-lite https://api.decadata.io/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn

Warnquote_sales
The server marks "quote_sales" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Can't be undone 1Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

quote_salesThe exact price of a window of daily or weekly sales and units (free), and the HTTP URL to buy it from with x402.Can send data out1 finding
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- outboundThe input takes a destination (input.to): what the tool writes goes there.
Findings
- Warn
  The server marks "quote_sales" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
  What this check looks for
Description, as the server wrote it
The exact price of a window of daily or weekly sales and units (free), and the HTTP URL to buy it from with x402.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false

Only reads 3Looks things up and changes nothing.Claude Code: allow

find_companiesSearch the ~380 US consumer companies covered, by name or ticker (free).No findings
Why it is in this group
- The name "find_companies" says "find": a word for reading.
Description, as the server wrote it
Search the ~380 US consumer companies covered, by name or ticker (free). Returns ISIN, ticker, name, tier (1 largest, 3 smallest, weekly only) and the first and last day of data.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false
get_sampleQ1 2019 daily (or weekly) sales, units and panel stores for one company, free, to see what the data looks like.No findings
Why it is in this group
- The name "get_sample" says "get": a word for reading.
Description, as the server wrote it
Q1 2019 daily (or weekly) sales, units and panel stores for one company, free, to see what the data looks like.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false
get_yoy_growthYear-on-year growth in a company's point-of-sale sales and units, $0.01 (x402, USDC on Base): its latest reported quarter (91 days to its end; never the one it hasn't reported) aga…No findings
Why it is in this group
- The name "get_yoy_growth" says "get": a word for reading.
Description, as the server wrote it
Year-on-year growth in a company's point-of-sale sales and units, $0.01 (x402, USDC on Base): its latest reported quarter (91 days to its end; never the one it hasn't reported) against the same weekdays a year earlier, per panel store, for the company and for the covered market, and the company against the market (vs_market_*, read it first).
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false
- idempotentHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out1: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; quote_sales

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 14:49 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 1
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: none
RFC 9728 protected resource metadata: none
Authorization servers: none
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

HighThe whole server
The endpoint served tools/list without credentials, and the list has 1 tool that changes things (1 irreversible). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://api.decadata.io/mcp: tools/list returned 4 tools to an anonymous client, including quote_sales (irreversible)
What this check looks for

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http odyssey-lite https://api.decadata.io/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__odyssey-lite__find_companies",
      "mcp__odyssey-lite__get_sample",
      "mcp__odyssey-lite__get_yoy_growth"
    ],
    "ask": [
      "mcp__odyssey-lite__quote_sales"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as odyssey-lite. Review it before you use it.

Capability tags behind 1 rule

mcp__odyssey-lite__quote_sales outbound

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.decadata/odyssey-lite/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Anlyon alternative

1 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Compare with other servers for the same product.

Source: MCP Registry. Synced Oct 21, 2026, 18:13 UTC.

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