Mercury402: Treasury/FRED financial data over x402
io.github.dudman1/mercury402-mcpdudman1streamable-httpv0.1.4Scanned
Treasury/FRED financial data over x402: pay-per-call US yields, macro and forex in USDC on Base
2 tools: 1 change things and 1 only read.
- Reads private data · 0
- Reads text others write · 1
- Can send data out · 0
- No findings
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 →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
2 tools
Changes things 1Claude Code: ask
get_endpoint_dataCall a Mercury402 endpoint on the live API.Reads text others writeNo findings
Why it is in this group
- The name "get_endpoint_data" says "get": a word for reading.
- The description's first verb is "call": a word for a change.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it Call a Mercury402 endpoint on the live API. This hosted endpoint is discovery-only: endpoints return HTTP 402 and this tool returns the price and x402 payment instructions instead of data. Pay with your own x402 client, or run mercury402-mcp locally (npx -y mercury402-mcp) with your own wallet. Use list_endpoints first to find paths and parameters. Path params can be inline ("/v1/fred/UNRATE") or passed in params ("/v1/fred/{series_id}" + {"series_id":"UNRATE"}). Other params go to the query string (GET) or JSON body (POST).
Annotations the server declares
- readOnlyHint: false
- openWorldHint: true
- idempotentHint: false
Only reads 1Show 1 read-only tool
list_endpointsList Mercury402 financial data endpoints (78 total) with path, method, category, description, price in USD (paid per call in USDC on Base via x402) and accepted parameters.No findings
Why it is in this group
- The name "list_endpoints" says "list": a word for reading.
Description, as the server wrote it List Mercury402 financial data endpoints (78 total) with path, method, category, description, price in USD (paid per call in USDC on Base via x402) and accepted parameters. Free; makes no network calls.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: 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 outbound.
- Reads private data0
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write1
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 0.1.4. Values in angle brackets are yours to fill in.
claude mcp add --transport http mercury402 https://mcp.mercury402.com/mcpclaude mcp add --transport http mercury402 https://mcp.mercury402.com/mcpRun 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.
{
"permissions": {
"allow": [
"mcp__mercury402__list_endpoints"
],
"ask": [
"mcp__mercury402__get_endpoint_data"
],
"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 mercury402. Review it before you use it.
Capability tags behind 1 rule
- mcp__mercury402__get_endpoint_data untrusted-input
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/io.github.dudman1/mercury402-mcp/verify?hash=9641483d4d242d51147e318d9c24a8428285890c8480f84170f4e75ca5573ceb" | jq -e '.changed == false'Pinned hash 9641483d4d24, from Oct 26, 2026, 03:17 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/io.github.dudman1/mercury402-mcp/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/io.github.dudman1/mercury402-mcp)Source: MCP Registry · repository. Synced Oct 26, 2026, 04:17 UTC.