// MCP TOOL REFERENCE

hydra_send_evm

ServerNear Hydra
CategoryFinancial

WHAT IT DOES

What hydra_send_evm does on Near Hydra

AI agents use hydra_send_evm to commit financial operations through Near Hydra — usually the final step of a payment, billing, or trading workflow. A call moves real money.

THE RISK

Critical Risk

Why hydra_send_evm needs a policy

This tool sends on-chain financial transactions (native ETH/EVM tokens or ERC-20 transfers) by signing and broadcasting to a blockchain. It directly moves cryptocurrency assets, which constitutes a financial operation. Misuse could result in irreversible loss of funds across EVM chains, warranting a critical severity rating.

From the tool's definition Send a transaction on an EVM chain from a Chain-Signature-derived address. Supports native value (valueWei) or ERC-20 transfer (erc20). dry=false signs via MPC and broadcasts.

Documented attack patterns abuse exactly the kind of access hydra_send_evm gives an agent:

POLICY

How to control hydra_send_evm

PolicyLayer is an MCP gateway — it sits between your AI agents and Near Hydra, and nothing reaches the server without passing your rules. This is the rule we recommend for hydra_send_evm:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hydra_send_evm": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to hydra_send_evm is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register Near Hydra — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Near Hydra tools

Financial hydra_swap_execute Execute an end-to-end cross-chain swap via NEAR Intents 1Click. Auto-routes the origin sen Financial hydra_swap_submit_deposit Notify 1Click that the deposit transaction has been broadcast. depositAddress comes from a Financial hydra_ensure_gas Top up the derived foreign-chain address with native gas, via a small NEAR Intents 1Click Financial hydra_send_btc Send BTC from a Chain-Signature-derived Bitcoin address. UTXO selection via Mempool API. S Financial hydra_send_ft Send a NEP-141 fungible token from the configured account. Calls ft_transfer with 1 yoctoN Financial hydra_send_near Send native NEAR from the configured account. SAFE BY DEFAULT: dry=true returns the plan w Financial hydra_send_solana Send native SOL from a Chain-Signature-derived Solana address. SAFE: dry=true returns the Financial hydra_send_spl Send a Solana SPL token from a Chain-Signature-derived Solana address. Auto-derives source

All 21 Near Hydra tools →

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Go deeper

Critical-risk tools in Near Hydra → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about hydra_send_evm

What does the hydra_send_evm tool do? +

Send a transaction on an EVM chain from a Chain-Signature-derived address. Supports native value (valueWei) or ERC-20 transfer (erc20). SAFE: dry=true returns the prepared unsigned transaction for inspection; dry=false signs via MPC and broadcasts. Requires the derived address to have funds + gas. predecessor defaults to the configured NEAR account. It is categorised as a Financial tool in the Near Hydra MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on hydra_send_evm? +

Register the Near Hydra MCP server in PolicyLayer and add a rule for hydra_send_evm: 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 Near Hydra. Nothing to install.

What risk level is hydra_send_evm? +

hydra_send_evm is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit hydra_send_evm? +

Yes. Add a rate_limit block to the hydra_send_evm 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.

How do I block hydra_send_evm completely? +

Set action: deny in the PolicyLayer policy for hydra_send_evm. 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.

What MCP server provides hydra_send_evm? +

hydra_send_evm is provided by the Near Hydra MCP server (nikshepsvn/near-hydra). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Near Hydra tool call.

Start from Near Hydra, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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21 Near Hydra tools catalogued and risk-classified — across an index of 43,000+ MCP servers.