01 / What each boundary answers
Compare the decision, not the label.
PlainID documents a PDP for contextual authorization and authorizers that can enforce decisions at API gateways and other integration points.
Assess origin grants, delegation narrowing, action-time checks and decision-to-outcome evidence for the target agent workflow.
02 / Same operating case
Which request must be stopped?
A finance agent invokes a payment API through a gateway, then retries after a timeout.
Evaluation exercise
Ask the PlainID PDP about one payment request with payee and amount attributes, then trace the response through its API authorizer and the transaction ledger. Evaluate ProofGrid only against the same deployed path.
03 / Architecture fit
How the controls can compose
A PlainID deployment may implement rich contextual policy; evaluate ProofGrid against the same concrete workflow and required interfaces.
This page does not claim PlainID lacks agent-specific capability or that ProofGrid has a shipped PlainID connector.
04 / Evidence
Prove the decision and the effect separately.
Inspect policy request/response, grant provenance, gateway enforcement, payment transaction and observed outcome.
Primary sources