Changelog

Last updated Jun 14, 2026

2026-05-01 · current

Initial GA release of the Matter API at https://api.mattermode.com/v1.

• Added — Entity formation. POST /v1/entities for Delaware (US-DE), California (US-CA), Texas (US-TX), and Wyoming (US-WY) C-Corps and LLCs. Async by default: returns 202 Accepted with a draft entity; subscribe to entity.state_changed for the rest of the cascade.

• Added — Declarative Intent resolution. POST /v1/intents resolves jurisdiction-agnostic outcomes into concrete Execution Plans. dry_run: true for preview.

• Added — Equity primitives: ShareClass, EquityPlan, Grant, Valuation, ShareLedgerEntry. Computed view CapTable at GET /v1/entities/{id}/cap_table.

• Added — Filings, Documents, Resolutions, Signing Envelopes, Mail. Full lifecycle from formation through dissolution.

• Added — Portfolio resource (pf_) for multi-tenant accounts. Multi-tenancy lives in the URL path, not in a header.

• Added — Bearer-token authentication. sk_live_ / sk_test_ for server-side; pk_live_ / pk_test_ for client-safe reads. Scoped agent tokens (tok_) with the four-tier authorization framework.

• Added — Matter-Version: YYYY-MM-DD header required on every request. Keys and tokens pin at creation — no auto-pin.

• Added — RFC 7807 application/problem+json error envelope across every non-2xx response, with stable code and request_id.

• Added — Idempotency-Key on every state-mutating route. 24-hour replay, token-scoped.

• Added — Cursor pagination on every list endpoint: limit / starting_after / ending_before, envelope {object: "list", data, has_more, url}.

• Added — ?expand[]=... with dot-notation, max depth 4. Inline related resources without follow-up requests.

• Added — Webhooks. WebhookEndpoint resource (whe_), HMAC-SHA256 signing on Matter-Signature, strict per-entity event ordering via sequence, retries with exponential backoff over 72 hours.

• Added — Test mode. sk_test_ keys run an isolated ledger with controllable timelines via X-Matter-Test-Speed: real | fast | instant.

• Added — Test clocks. POST /v1/test-clocks + /advance to fast-forward time inside test mode for deadline-driven logic.

• Added — IncorporatorReceipt resource (rcp_) — cryptographically signed birth proof for every formation, verifiable offline.

• Added — AuditEntry resource (aud_). Every state transition is externally queryable via GET /v1/entities/{id}/audit.

• Added — Compliance computed view at GET /v1/entities/{id}/compliance — health rollup across filings, franchise tax, BOI, and foreign qualifications.

• Added — Hosted sessions for KYC and e-signature collection (POST /v1/hosted-sessions).

• Added — GET /v1/api_versions discovery endpoint. Returns the canonical version registry — every major and its dated minor releases.

• Added — MCP server at mcp.mattermode.com. Tool catalog generated from this spec; tier-filtered at connect time.