StableOps Agent Payments MCP Server

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A stdio Model Context Protocol (MCP) server that lets agents configure and run StableOps Agent Payments while private keys, seed phrases, KMS credentials, and approval authority remain user-controlled.

Install and run

Node.js 20 or later is required.

Provide only the management key during setup:

STABLEOPS_API_KEY=sk_sandbox_... \
STABLEOPS_AP_ENABLE_MANAGEMENT_WRITES=true \
STABLEOPS_AGENT_KEY_OUTPUT_FILE=/protected/absolute/path/stableops-agent-key \
npx -y -p @stableops/agent-payments-mcp-server@0.2.0 stableops-agent-payments-mcp

Management mode is read-only by default. Mutating tools are registered only with STABLEOPS_AP_ENABLE_MANAGEMENT_WRITES=true; the management process never exposes open-world discovery or payment execution. The one-time Agent Key secret is never returned to the model. The server reserves the 0600 destination before issuance and automatically revokes a newly issued key if storage fails.

The wallet-pairing tool returns only the exact message the user must sign. No tool accepts a private key, seed phrase, or KMS credential. The user signs in their own wallet and returns only the signature.

For daily runtime use, remove the management key and use a restricted Agent Key plus the user-operated signer sidecar:

STABLEOPS_AGENT_KEY=ak_sandbox_... \
STABLEOPS_SIDECAR_URL=http://127.0.0.1:8789 \
STABLEOPS_SIDECAR_TOKEN=... \
npx -y -p @stableops/agent-payments-mcp-server@0.2.0 stableops-agent-payments-mcp

Management and runtime modes are mutually exclusive. The server refuses to start when both STABLEOPS_API_KEY and STABLEOPS_AGENT_KEY are set. Runtime mode only exposes discovery, budget, preview, controlled purchase, and payment-reconciliation tools; it cannot change policy or approve its own payment.

Security model

• The server never accepts or stores wallet private keys, seed phrases, or KMS credentials.
• The user must sign wallet-ownership proofs outside the server.
• Runtime payment can only call the user-operated constrained signer sidecar, never an arbitrary signing endpoint.
• Unknown origins, unknown recipients, and above-threshold payments require human approval in StableOps.
• Every new purchase requires a stable idempotency_key; uncertain settlement must reconcile the original intent.
• Every purchase must use a preview_token bound to the exact URL, maximum quote, and audit context; the purchase tool accepts no replacement URL.
• Preview tokens are process-local. After an MCP restart, preview the original exact URL again and resume with the new token; the API verifies the full URL hash stored on the intent.
• Responses over 256 KiB are available as short-lived MCP resources; all inline summaries are marked as untrusted external content.

Documentation

See the complete guide at https://stableops.dev/en/docs/agent-payments/quickstart

License

Apache-2.0