evm_balance
Native ETH and ERC-20 token balances for an address on Ethereum, Base or Arbitrum via public RPC. Defaults to major tokens (USDC, USDT, WETH, DAI/ARB) or pass up to 20 token contracts. Read-only. Price: $0.005 USDC per successful call (x402, Solana). Same tool over HTTPS: GET https://scorptech.it...
This record as markdown: /tools/com-it-scorptech-x402/evm-balance.md
What evm_balance does on ScorpTech x402 API
AI agents call evm_balance to retrieve information from ScorpTech x402 API without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
chain | string | — | chain; default "eth" |
tokens | string | — | ERC-20 contract addresses (JSON array or comma-separated). Omit for the chain default token set. (comma-separated) |
address | string | Yes | 0x EVM address (EIP-55 checksum validated if mixed case) |
include_zero | boolean | — | Include tokens with zero balance; default true |
include_defaults | boolean | — | Also include the default token set when tokens are given; default true |
Parameters from the server's own tool schema.
Why evm_balance is rated Low
Even though evm_balance only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs evm_balance safely
PolicyLayer is an MCP gateway: it sits between your AI agents and ScorpTech x402 API, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For evm_balance, this is the rule to start with:
evm_balance is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect ScorpTech x402 API, apply this rule, and every evm_balance call is checked against it from then on.
Questions about evm_balance
Native ETH and ERC-20 token balances for an address on Ethereum, Base or Arbitrum via public RPC. Defaults to major tokens (USDC, USDT, WETH, DAI/ARB) or pass up to 20 token contracts. Read-only. Price: $0.005 USDC per successful call (x402, Solana). Same tool over HTTPS: GET https://scorptech.it.com/api/x402/v1/evm-balance. It is categorised as a Read tool in the ScorpTech x402 API MCP Server, which means it retrieves data without modifying state.
evm_balance accepts 5 parameters: chain, tokens, address, include_zero, include_defaults. Required: address. The full parameter table on this page comes from the server's own tool schema.
Register the ScorpTech x402 API MCP server in PolicyLayer and add a rule for evm_balance: 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 ScorpTech x402 API. Nothing to install.
evm_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the evm_balance 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 evm_balance. 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.
evm_balance is provided by the ScorpTech x402 API MCP server (https://scorptech.it.com/api/x402/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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