Provision an AWS KMS-backed Ethereum signer for signing smart-contract write transactions. Private keys never leave KMS. Cost: $0.04/day rental ($1.20/month) plus $0.000005 per contract call. Requires $1.20 in cash credit at creation (30 days of rent). Non-custodial.
AI agents use provision_signer to commit financial operations through Run402 — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Provisioning this signer incurs immediate and ongoing financial charges — $1.20 upfront at creation plus recurring daily rental and per-call fees. It also enables signing of smart-contract write transactions on Ethereum, which can themselves carry financial consequences.
From the tool's definition Cost: $0.04/day rental ($1.20/month) plus $0.000005 per contract call. Requires $1.20 in cash credit at creation (30 days of rent).
Attacks that exploit this kind of access
Provision an AWS KMS-backed Ethereum signer for signing smart-contract write transactions. Private keys never leave KMS. Cost: $0.04/day rental ($1.20/month) plus $0.000005 per contract call. Requires $1.20 in cash credit at creation (30 days of rent). Non-custodial. It is categorised as a Financial tool in the Run402 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Run402 MCP server in PolicyLayer and add a rule for provision_signer: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Run402. Nothing to install.
provision_signer is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the provision_signer rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for provision_signer. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
provision_signer is provided by the Run402 MCP server (kychee-com/run402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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