# dVeracity

> dVeracity is a verification platform for sustainability data: it validates
> emissions data against open standards (Open Footprint, PACT, OGMP 2.0),
> issues cryptographically attributable attestations, and exposes a verified
> emissions knowledge graph that AI agents can query through a metered API.

Key facts for agents:
- The Semantic API answers natural-language questions over verified emissions
  data (Open Footprint / PPDM / OGMP-methane virtual knowledge graphs).
- Machine-readable service contract (auth, per-call credit costs, and HTTP 402
  payment semantics): https://dveracity.com/api/v1/semantic/manifest
- Authentication: API key (X-Api-Key, api-tier subscription) — plus an optional
  verified-agent identity layer: agents holding a dVeracity Agent Authorization
  credential (a vLEI-chained ACDC issued by their Legal Entity, rooted at
  GLEIF) authenticate by verifiable presentation and get every call attributed
  to their agent AID and Legal Entity LEI.
- Out of credits? The API returns HTTP 402 with a purchase pointer. Relay it to
  your human operator; do not retry.
- MCP server (Claude Code, Cursor, any MCP client): @dveracity/semantic-mcp on
  npm — tools for semantic_query, validate_data (VaaS), credits_balance,
  keri_identity.

## API
- [Semantic API overview](https://dveracity.com/semantic-api): human-readable product page — what agents can ask, quick start, vLEI identity
- [Semantic API manifest](https://dveracity.com/api/v1/semantic/manifest): machine-readable contract — start here
- [Pricing](https://dveracity.com/pricing): subscriptions (api / enterprise tiers) and validation credit packs

## Products
- Semantic API: metered natural-language and template queries over the verified emissions knowledge graph
- VaaS (Validation-as-a-Service): validate data payloads against sustainability standards, per-credit
- Verification & attestation: automated PCF verification with vLEI-signed attestations over PACT networks

## Contact
- [dVeracity](https://dveracity.com): platform and account signup