Bankr Dev Arbitrary Transactions

This lets Claude submit raw EVM transactions with custom calldata through the Bankr API. You'd use it when you need to interact with any smart contract directly, send value transfers with attached data, or execute pre-built calldata across supported chains without wrapping everything in higher level abstractions. It's the escape hatch for when you need full control over what goes on chain. The repo has 78 stars, so there's at least some community validation. Fair warning though: arbitrary transaction submission is powerful but also means you're responsible for getting the calldata right, so probably not the best starting point if you're new to EVM internals.

GitHub stars: 80
last updated: Aug 21, 2026

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Install

$ npx -y skills add bankrbot/claude-plugins --skill 'Bankr Dev - Arbitrary Transactions' --agent claude-code

Installs into .claude/skills of the current project.

Files

Arbitrary Transaction Capability

Submit raw EVM transactions with explicit calldata via the Bankr API.

What You Can Do

Operation	Description
Submit calldata	Execute pre-built calldata on any supported chain
Custom contract calls	Interact with any contract using raw function calls
Value transfers with data	Send ETH/MATIC while executing calldata

JSON Schema

{
  "to": "0x...",
  "data": "0x...",
  "value": "0",
  "chainId": 8453
}

Field	Type	Required	Description
`to`	string	Yes	Contract address (0x + 40 hex chars)
`data`	string	Yes	Calldata (0x + hex, or "0x" for empty)
`value`	string	Yes	Wei amount as string
`chainId`	number	Yes	Target chain (1, 137, or 8453)

Supported Chains

Chain	Chain ID
Ethereum	1
Polygon	137
Base	8453
Unichain	130

Usage

import { execute } from "./bankr-client";

// Submit arbitrary transaction
const txJson = {
  to: "0x1234567890abcdef1234567890abcdef12345678",
  data: "0xa9059cbb...",
  value: "0",
  chainId: 8453
};

SKILL.md on GitHub