# fed_board_h15_rate_spread

Calculate a time series of one Federal Reserve Board H.15 rate minus another on aligned business dates. Returns both canonical series, component values, percentage-point and basis-point spreads, pagination, provenance, and exact hosted coverage. Use this for '10-year minus 2-year Treasury spread', 'prime minus fed funds', or 'compare 30-year and 5-year yields'. Treasury aliases such as '10y' and '2y' are accepted. Not a forecast or trading signal.

Agent View of the PolicyLayer registry record for `fed_board_h15_rate_spread`. HTML page: https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/fed-board-h15-rate-spread

## Facts

- Tool: `fed_board_h15_rate_spread`
- Server: Livedatalink (`https://livedatalink.ai/mcp`) — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink.md
- Homepage: https://github.com/blackboxfoundry/livedatalink
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: no
- Parameters: 7 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | integer | no | Maximum aligned observations. Default 30. |
| `offset` | integer | no | Aligned observations to skip. Default 0. |
| `end_date` | string | no | ISO date YYYY-MM-DD. |
| `series_a` | string | yes | Exact H.15 series_name, descriptive name, or Treasury alias such as '10-year Treasury', '2y', or '3-month Treasury'. |
| `series_b` | string | yes | Exact H.15 series_name, descriptive name, or Treasury alias such as '10-year Treasury', '2y', or '3-month Treasury'. |
| `start_date` | string | no | ISO date YYYY-MM-DD. |
| `response_format` | string | no | Human-readable markdown or machine-readable JSON. Default markdown. |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "fed_board_h15_rate_spread",
    "arguments": {
      "series_a": "<series_a>",
      "series_b": "<series_b>"
    }
  }
}
```

## Why fed_board_h15_rate_spread is rated Low

Even though fed_board_h15_rate_spread only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

## Use case

AI agents call fed_board_h15_rate_spread to retrieve information from Livedatalink without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Livedatalink:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "fed_board_h15_rate_spread": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-blackboxfoundry-livedatalink · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-blackboxfoundry-livedatalink