bankr agent - sign & submit api
This skill should be used when the user asks to "sign a message", "sign typed data", "sign a transaction", "submit a transaction", "submit raw transaction", "personalsign", "EIP-712", "ethsignTypedData", "ethsignTransaction", or any direct signing or transaction submission operation. Covers the synchronous /agent/sign and /agent/submit endpoints.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/bankrbot/claude-plugins --skill bankr-agent---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 agent - 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 messages and submitting transactions directly — no polling required.
Overview
| Endpoint | Purpose | Returns |
|---|---|---|
POST /agent/sign | Sign messages, typed data, or transactions | Signature |
POST /agent/submit | Submit raw transactions to chain | Transaction hash |
Unlike /agent/prompt (async with job polling), these endpoints return immediately.
POST /agent/sign
Sign data without broadcasting to the network.
Signature Types
| Type | Use Case |
|---|---|
personal_sign | Sign plain text messages (auth, verification) |
eth_signTypedData_v4 | Sign EIP-712 typed data (permits, orders) |
eth_signTransaction | Sign transactions for later broadcast |
Prompt Examples
Sign a message:
- "Sign this message: Hello World"
- "Sign in to MyApp with nonce abc123"
Sign typed data (EIP-712 permit):
- "Sign this EIP-712 permit for USDC approval"
Sign a transaction without broadcasting:
- "Sign this transaction but don't send it"
Success Response
{
"success": true,
"signature": "0x...",
"signer": "0xYourWalletAddress",
"signatureType": "personal_sign"
}
Common Errors
| 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
Submit raw transactions directly to the blockchain.
Transaction Fields
| Field | Required | Description |
|---|---|---|
to | Yes | Destination address |
chainId | Yes | Chain ID (8453=Base, 1=Ethereum, 137=Polygon) |
value | No | Value in wei (as string) |
data | No | Calldata (hex string) |
gas | No | Gas limit |
waitForConfirmation | No | Wait for on-chain confirmation (default: true) |
Prompt Examples
Submit a raw transaction:
- "Submit this transaction on Base: {to: 0x..., data: 0x..., value: 0}"
Simple ETH transfer:
- "Submit a transfer of 1 ETH to 0x..."
Success Response
With confirmation:
{
"success": true,
"transactionHash": "0x...",
"status": "success",
"blockNumber": "12345678",
"gasUsed": "21000",
"signer": "0xYourWalletAddress",
"chainId": 8453
}
Transaction Status Values
| Status | Description |
|---|---|
success | Confirmed and succeeded |
reverted | Confirmed but reverted |
pending | Submitted, not yet confirmed |
Use Cases
- Authentication: Sign messages to verify wallet ownership
- Gasless approvals: Sign EIP-2612 permits without gas
- Pre-built transactions: Submit calldata from external tools
- Multi-step workflows: Execute approve + swap in sequence
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/submitexecutes immediately with no confirmation prompt- Validate all transaction parameters before submission
- Use
waitForConfirmation: truefor important transactions - Read-only API keys cannot use these endpoints (403)
FAQ
What does the bankr agent - sign & submit api skill do?
This skill should be used when the user asks to "sign a message", "sign typed data", "sign a transaction", "submit a transaction", "submit raw transaction", "personalsign", "EIP-712", "ethsignTypedData", "ethsignTransaction", or any direct signing or transaction submission operation. Covers the synchronous /agent/sign and /agent/submit endpoints.
How do I install bankr agent - sign & submit api?
Run npx skills add https://github.com/bankrbot/claude-plugins --skill bankr-agent---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-agent---sign-&-submit-api/ (personal) or .claude/skills/bankr-agent---sign-&-submit-api/ (project).
Which AI agents can use bankr agent - 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 agent - 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 agent - sign & submit api?
It is published by bankrbot in bankrbot/claude-plugins. It has 325 recorded installs.
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