bankr dev - sign & submit api

Q: How do I install bankr dev - sign & submit api?

Run npx skills add https://github.com/bankrbot/claude-plugins --skill bankr-dev---sign-&-submit-api in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/bankr-dev---sign-&-submit-api/ (personal) or .claude/skills/bankr-dev---sign-&-submit-api/ (project).

by bankrbotBackend & APIs

This skill should be used when building apps that need to sign messages, sign typed data (EIP-712), sign transactions, or submit raw transactions via the Bankr API. Covers the synchronous /agent/sign and /agent/submit endpoints with TypeScript patterns.

Installs: 321
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/bankrbot/claude-plugins --skill bankr-dev---sign-&-submit-api

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads bankr dev - sign & submit api automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Sign & Submit API

Synchronous endpoints for signing and submitting transactions directly — no job polling required.

Endpoints

Endpoint	Purpose	Returns
`POST /agent/sign`	Sign messages, typed data, or transactions	Signature
`POST /agent/submit`	Submit raw transactions to chain	Transaction hash

POST /agent/sign

Signature Types

Type	Use Case
`personal_sign`	Plain text messages (auth, verification)
`eth_signTypedData_v4`	EIP-712 typed data (permits, orders)
`eth_signTransaction`	Sign transactions for later broadcast

Usage

// personal_sign
const signMessage = await fetch(`${API_URL}/agent/sign`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    signatureType: "personal_sign",
    message: "Sign in to MyApp\nNonce: abc123",
  }),
});
// → { success: true, signature: "0x...", signer: "0x...", signatureType: "personal_sign" }

// eth_signTypedData_v4 (EIP-2612 permit)
const signPermit = await fetch(`${API_URL}/agent/sign`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    signatureType: "eth_signTypedData_v4",
    typedData: {
      domain: { name: "USD Coin", version: "2", chainId: 8453, verifyingContract: "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913" },
      types: {
        Permit: [
          { name: "owner", type: "address" },
          { name: "spender", type: "address" },
          { name: "value", type: "uint256" },
          { name: "nonce", type: "uint256" },
          { name: "deadline", type: "uint256" },
        ],
      },
      primaryType: "Permit",
      message: { owner: "0x...", spender: "0x...", value: "1000000", nonce: "0", deadline: "1735689600" },
    },
  }),
});

// eth_signTransaction
const signTx = await fetch(`${API_URL}/agent/sign`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    signatureType: "eth_signTransaction",
    transaction: { to: "0x...", chainId: 8453, value: "0", data: "0xa9059cbb..." },
  }),
});

Error Responses

Status	Error	Cause
400	Missing required field	Missing message, typedData, or transaction
401	Authentication required	Missing or invalid API key
403	Read-only API key	Key lacks write permissions

POST /agent/submit

Transaction Fields

Field	Type	Required	Description
`to`	string	Yes	Destination address
`chainId`	number	Yes	Chain ID (8453=Base, 1=Ethereum, 137=Polygon)
`value`	string	No	Value in wei
`data`	string	No	Calldata (hex)
`gas`	string	No	Gas limit
`maxFeePerGas`	string	No	EIP-1559 max fee
`maxPriorityFeePerGas`	string	No	EIP-1559 priority fee

Options

Field	Type	Default	Description
`description`	string	—	Human-readable description for logging
`waitForConfirmation`	boolean	true	Wait for on-chain confirmation

Usage

// Submit a transaction and wait for confirmation
const result = await fetch(`${API_URL}/agent/submit`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    transaction: { to: "0x...", chainId: 8453, value: "1000000000000000000" },
    description: "Send 1 ETH",
    waitForConfirmation: true,
  }),
});
// → { success: true, transactionHash: "0x...", status: "success", blockNumber: "123", gasUsed: "21000" }

// Fire-and-forget (don't wait for confirmation)
const pending = await fetch(`${API_URL}/agent/submit`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    transaction: { to: "0x...", chainId: 8453, value: "100000000000000000" },
    waitForConfirmation: false,
  }),
});
// → { success: true, transactionHash: "0x...", status: "pending" }

Multi-Step Workflow

// Approve + Swap sequence
async function approveAndSwap(approveTx: object, swapTx: object) {
  // 1. Approve token spending
  const approval = await submitTransaction(approveTx);
  if (approval.status !== "success") throw new Error("Approval failed");

  // 2. Execute swap
  const swap = await submitTransaction(swapTx);
  if (swap.status !== "success") throw new Error("Swap failed");

  return swap;
}

Transaction Status Values

Status	Description
`success`	Confirmed and succeeded
`reverted`	Confirmed but reverted
`pending`	Submitted, not yet confirmed

Comparison with /agent/prompt

Feature	/agent/prompt	/agent/sign	/agent/submit
Input	Natural language	Structured data	Transaction object
Response	Async (job ID)	Sync (signature)	Sync (tx hash)
Executes on-chain	Via AI agent	No	Yes
Best for	General queries	Auth, permits	Raw transactions

Security Notes

/agent/submit executes immediately — no confirmation prompt
Read-only API keys get 403 on both endpoints
Always validate transaction parameters before submission
Use waitForConfirmation: true for critical transactions

Related Skills

bankr-api-basics - API fundamentals
bankr-client-patterns - Client setup
bankr-safety - Security best practices
bankr-arbitrary-transaction - Constructing raw transaction JSON

FAQ

What does the bankr dev - sign & submit api skill do?

How do I install bankr dev - sign & submit api?

Run npx skills add https://github.com/bankrbot/claude-plugins --skill bankr-dev---sign-&-submit-api in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/bankr-dev---sign-&-submit-api/ (personal) or .claude/skills/bankr-dev---sign-&-submit-api/ (project).

Which AI agents can use bankr dev - sign & submit api?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is bankr dev - sign & submit api safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains bankr dev - sign & submit api?

It is published by bankrbot in bankrbot/claude-plugins. It has 321 recorded installs.

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bankr dev - sign & submit api

Install

Install

Describe the task

Review the result

SKILL.md

Sign & Submit API

Endpoints

POST /agent/sign

Signature Types

Usage

Error Responses

POST /agent/submit

Transaction Fields

Options

Usage

Multi-Step Workflow

Transaction Status Values

Comparison with /agent/prompt

Security Notes

Related Skills

FAQ

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