We are designing an MCP layer for agent payments, not shipping one yet.
Signets is working with early teams on what an honest, safe MCP interface for payments should look like. If you need agents to check out online without sharing your main card or losing the audit trail, we want to shape that workflow with you.
Current Status
There is no public Signets MCP server, no production endpoint, and no install flow to share today.
This page exists so teams evaluating agent payments can see the direction clearly instead of guessing from draft materials.
What We Are Validating
API shape
How intents, approvals, cards, and reconciliation should surface in an MCP-native workflow.
Runtime safety
What sensitive data should never enter model context, and what must stay in a secure execution layer.
Developer ergonomics
How teams want to test, simulate, and debug agent spend before anything goes live.
Operational handoff
How product, finance, and security teams review the same payment event from different angles.
Design Principles
The bar is not “payments from MCP.” The bar is “payments from MCP without lying about the hard parts.”
Intent before credentials
Agents should declare what they want to buy before any payment instrument is issued or unlocked.
Controls in the transaction path
Merchant rules, budgets, and approval thresholds should be enforced in the payment layer, not left to prompt discipline.
Evidence by default
Every agent-initiated charge should be traceable to the exact workflow, policy decision, and outcome that produced it.
Who This Is For
Teams building browser or workflow agents that need real checkout.
Products exploring delegated card spend, vendor payments, or controlled subscriptions.
Operators who care about approvals, audit trails, and finance-grade reconciliation from day one.
Next Step
Talk to us before you design around a fake endpoint.
If you are actively building agent checkout or delegated spend, we can review your workflow, pressure-test the control model, and decide whether you are a fit for the design partner group.