decide.fyi for systems and agents

Deterministic decision infrastructure: REST endpoints for systems, plus MCP notaries for agents.

Systems (Core API)

Use REST endpoints when your backend needs deterministic verdicts, request IDs, and repeatable logic.

Runtime

POST /api/v1/{policy}/{action}

Output

ALLOWED | DENIED | UNKNOWN (or policy-specific verdicts)

Design

Stateless request handling for auditable decision execution.

Deterministic system path

Use MCP notaries when AI agents need a source-of-truth decision endpoint they cannot hallucinate around.

Refund

Cancel

Return

Trial

Contextual agent path

Notary endpoints

MCP

REST

POST /api/v1/refund/eligibility

MCP

REST

POST /api/v1/cancel/penalty

MCP

REST

POST /api/v1/return/eligibility

MCP

REST

POST /api/v1/trial/terms