# Mercury402: Treasury/FRED financial data over x402

> Treasury/FRED financial data over x402: pay-per-call US yields, macro and forex in USDC on Base

- name: io.github.dudman1/mercury402-mcp
- version: 0.1.4
- connection class: R0 (autonomous)
- trust: 97/100
- quality: 86/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.dudman1%2Fmercury402-mcp
- tools: https://api.protogrid.dev/v1/servers/io.github.dudman1%2Fmercury402-mcp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "mercury402-mcp": {
      "type": "http",
      "url": "https://mcp.mercury402.com/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 99
- freshness: 100
- provenance: 90
- drivers: +repository +namespace-matches-repo +website +reachable +uptime-99% +updated-19d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 86/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 88 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 2 of 2 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_endpoints (destructiveHint, idempotentHint); get_endpoint_data (destructiveHint)
- pass `tools.token_cost`: about 465 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump
- pass `tools.hidden_text`: no hidden text in tool names, descriptions, schemas or annotations

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name
- pass `stability.new_links`: no tool change named a new site

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: deps.dev does not know mercury402-mcp@0.1.4

- tools: 2, about 465 tokens to load them all
- tool set hash: 27ff3cc3bb0bf85fb888cdc61bf74217
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.dudman1/mercury402-mcp.svg)](https://protogrid.dev/servers/io.github.dudman1/mercury402-mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Dependencies

- npm mercury402-mcp@0.1.4: unknown

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0.

## Remotes

- https://mcp.mercury402.com/mcp (streamable-http, auth none, reachable true, uptime30d 0.9868421)

## Packages

- npm mercury402-mcp@0.1.4 secrets: MERCURY402_PAYER_PRIVATE_KEY

## Tools (2)

- `get_endpoint_data`: 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).
- `list_endpoints`: 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.