dVeracity Semantic API MCP server

dVeracity Semantic MCP server

Gives any MCP-capable AI agent (Claude Code, Cursor, custom agents) metered access to the dVeracity Semantic API — natural-language queries over the verified-emissions knowledge graph (Open Footprint / PPDM / OGMP-methane) — and VaaS standards validation.

Prerequisites

1. An api-tier subscription: https://dveracity.com/pricing
2. An API key (dvrc_…): POST /api/v1/api-keys (or the dashboard)
3. API credits for metered calls: POST /api/v1/vaas/credits/purchase

The machine-readable service contract lives at GET /api/v1/semantic/manifest (public, no auth).

Install

From this directory: npm install

Claude Code

claude mcp add dveracity \
  -e DVERACITY_API_KEY=dvrc_yourkey \
  -- node /path/to/dVE/mcp/semantic-mcp/index.js

Generic MCP JSON config (Cursor, etc.)

{
  "mcpServers": {
    "dveracity": {
      "command": "node",
      "args": ["/path/to/dVE/mcp/semantic-mcp/index.js"],
      "env": { "DVERACITY_API_KEY": "dvrc_yourkey" }
    }
  }
}

Optional: DVERACITYAPIURL overrides the API base URL (defaults to prod).

KERI mode — verified agent identity (optional)

If the agent holds a dVeracity Agent Authorization credential (an ACDC issued by its Legal Entity, chained to the Legal Entity's vLEI — see elm/docs/VLEIAGENTTOKENS_DESIGN.md), set:

DVERACITY_KERI_AID=<the agent's AID (credential issuee)>
DVERACITY_KERI_PRESENTATION=/path/to/agent-credential.cesr   # self-contained CESR

The server then authenticates the agent by verifiable presentation (challenge → exchange → 1-hour session, refreshed transparently) and attaches X-Keri-Session to every call: the API key keeps carrying billing, the KERI session adds verified identity — every metered call is attributed to the agent AID and Legal Entity LEI in dVeracity's audit trail. The keri_identity tool (free) shows the active identity. Scope denials (a credential that doesn't carry e.g. semantic:query) surface as actionable errors naming the carried scopes. Signify-based nonce signing is a planned enhancement.

Tools

Open Footprint canonical model

Design-time tools for building an application on the Open Footprint standard. Reading the model is free; only the check at the end is metered.

Shortened. The full README is on GitHub.