verifiable e-signatures, anchored to the blockchain

• Create Agreement — Create and optionally send an agreement in a single call. Supports either a built-in template (with variables) or an uploaded PDF (document_base64). Signers can be individuals OR companies — set party_type='company' with company_name + signer_title to sign on behalf of a legal entity (corp-to-corp, corp-to-individual). Returns agreement_id, signing URLs, and verification URL.
• Get Agreement Status — Fetch unified status for an agreement: envelope state, per-signer status, verification URL.
• List Agreements — List recent agreements for the calling org.
• List Templates — List contract templates available to the calling org (org-owned + platform public).
• Verify Agreement — Public verification of an agreement's audit chain and on-chain anchor.
• Void Agreement — Void an envelope before all parties sign.
• Preview Template — Render a template with variables (no PDF, no envelope) — useful to validate inputs before create_agreement.
• Upload Document — Upload a document for use in agreements. Accepts plain text or Markdown — blocksign converts it to PDF. Optionally runs AI field detection and returns suggested signature positions.
• Detect Fields — Run AI field detection on a previously uploaded text document. Returns suggested signature/initials/date field positions.
• Check Billing Status — Check current billing plan, credit balance, usage, and per-document pricing for the calling org.
• Purchase Credits — Purchase a credit pack (10, 50, or 200 credits). If payment method on file, charges immediately. Otherwise returns a checkout URL.

Schemas and invoke metadata: Directory API