Callput × Bankr

Built for Bankr Base · 24/7

Defined-risk options, directly inside Bankr.

Scan synthetic stock, ETF, and crypto option spreads. See the maximum loss before anything reaches your wallet—then review and approve in Bankr chat.

Open Callput in Bankr ↗ Try the 30-second demo ↓
No private keys

Callput prepares. Your Bankr wallet signs.

Not auto-submitted

You must send and approve in Bankr chat.

Synthetic on-chain

Not broker-listed securities or ownership.

Interactive trade preview Simulation · no wallet
1 · Choose a market Deterministic example
Choose a market and scan a deterministic example. No wallet is connected.

First confidence moment

From market view to wallet review.

Three explicit steps. Callput scans and prepares; Bankr remains the signing boundary.

  1. 01 · Scan

    Choose a view

    Select an asset, direction, and size. Callput ranks valid spreads.

    No wallet action
  2. 02 · Review

    Know the exact risk

    Inspect strikes, expiry, minimum fill, network fee, and maximum USDC at risk.

    Unsigned tx only
  3. 03 · Approve

    Send in Bankr

    Open the exact transaction in Bankr chat. Nothing is submitted until you send and approve.

    User controlled

Product breadth

Markets available in one interface.

Candidate availability depends on the live Callput feed, selected direction, expiry, and risk constraints.

Checking current Callput market availability…

Crypto
BTCETH
Stocks
TSLANVDACOINSPCXMUSKHY
ETFs
QQQSPYEWY

Full position lifecycle

Open is only the beginning.

Refresh the signed-in wallet, choose the eligible action, then review the exact Base transaction in Bankr chat.

  1. 01 · Before expiry

    Close one position

    Choose one unexpired token, set positive raw-USDC minimum outputs, and open its close review.

    callput_close_position
  2. 02 · After expiry

    Settle one expired position

    Choose one expired token, set a positive swap floor, and open its settlement review.

    callput_settle_position
  3. 03 · Wallet batch

    Close all open positions

    Build full-close transactions for every unexpired Callput position in the connected wallet.

    callput_close_all_positions
  4. 04 · Wallet batch

    Settle all expired positions

    Build settlement transactions for every expired Callput position in the connected wallet.

    callput_settle_all_positions

Confirmation boundary: Each position requires its own Bankr transaction review. Batch preparation never signs, broadcasts, or auto-confirms a queue.

Trust architecture

The signing boundary is visible.

Callput explains and prepares. Bankr presents. Only the user's wallet can authorize movement of funds.

  1. 01

    Callput App

    Scans markets, validates structure, and prepares exact Base transaction data.

  2. 02

    Bankr Chat

    Displays transaction details and waits for explicit user action.

  3. 03

    User Wallet

    Signs and broadcasts only after the user sends and approves.

Canonical Base contracts: Base USDC · Callput Router · Callput PositionManager.

Public app view: the links on this page open the viewer-facing route. Bankr host may still display its Scripts drawer; the Callput iframe still runs with viewer identity and gates trading behind sign-in.

For Bankr agents and builders

Give your Bankr agent direct Callput tools.

Add one public Streamable HTTP endpoint. The MCP exposes twelve Callput tools, including individual and wallet-wide close/settle builders, and returns unsigned transaction payloads; signing stays inside Bankr.

Open the Callput Skill ↗
MCP configuration
Name: callput-lite-agent-mcp
URL: https://mcp.callput.app/api/mcp
Transport: HTTP
Authentication: None
Read-only first prompt
List the Callput MCP tools, then scan one BTC bullish spread.
Do not prepare, sign, or submit a transaction.

Answers before the first click

Frequently asked questions.

Visible answers match the page's machine-readable FAQ contract.

Getting started in Bankr

Access, sign-in, and the first scan.

What is the Callput Bankr App?

The Callput Bankr App is a viewer-specific trade builder that scans Callput markets, shows a defined-risk spread, and prepares a Base transaction for review in Bankr chat. The app does not sign or submit the transaction by itself.

Why does the Callput Bankr App look blank when I open its URL?

The short non-owner app route can render a blank Bankr shell. Use the owner-scoped public link on this page. Anonymous visitors should see the app and a sign-in prompt; sign in before scanning or preparing a trade.

Do I need Bankr Club or Max Mode to use the app?

Bankr controls access to Apps and social-agent surfaces under its current account tiers. If a free account cannot open the app or receive an X reply, check the current Bankr Club or Max Mode access requirements in Bankr.

How do I open Callput inside Bankr?

Sign in to Bankr, open the public Callput app URL linked on this page, choose a supported asset, market view, and size, and run a scan. Bankr may also show its host Scripts drawer, but the Callput iframe uses viewer identity and requires sign-in before scanning. Review the exact maximum risk before opening the Bankr transaction handoff.

What does public mean for a Bankr App?

Public means the app can be discovered or opened by eligible Bankr users under Bankr's app access rules. It does not necessarily mean that an anonymous visitor can render the personalized viewer app without signing in.

Markets, strategies, and funding

Assets, direction, size, and Base funding.

Which assets are available in the Callput Bankr App?

The app supports BTC, ETH, TSLA, QQQ, SPY, EWY, NVDA, COIN, SPCX, MU, and SKHY. The page reads current contract counts from the live Callput assets endpoint because a supported symbol can temporarily have no valid candidate.

Which network does the Bankr transaction use?

Callput transactions use Base mainnet, chain ID 8453. Make sure the Bankr EVM wallet selected for the app has the required assets on Base rather than on another network.

Which funds do I need for a Callput trade in Bankr?

The Bankr wallet generally needs Base USDC for premium or collateral and Base ETH for the displayed execution fee. The required amounts depend on the selected spread, size, allowance, and current contract fee.

How do market view choices map to Callput strategies?

Bullish maps to BuyCallSpread, bearish maps to BuyPutSpread, neutral-bearish maps to SellCallSpread, and neutral-bullish maps to SellPutSpread. The app ranks structurally valid candidates for the selected view.

How should I choose size and risk budget?

Begin with a small positive size and a maximum-risk amount you can afford to lose. Increasing size scales premium, collateral, and maximum risk, so review the size-adjusted risk rather than only the per-unit spread price.

Review, approval, and execution

Inspect the handoff before approving.

What does maximum at risk mean in the Bankr review?

It is the calculated USDC exposure ceiling for the selected spread and requested size under the prepared intent. It should be reviewed alongside strikes, expiry, minimum fill, allowance, and the Base ETH execution fee.

What is the difference between debit and credit spreads?

A debit spread pays premium upfront and has risk generally bounded by that cost. A credit spread receives premium but requires collateral, with maximum loss bounded by spread width and received credit under the protocol calculation.

Why might Bankr show a USDC approval transaction first?

The wallet's current Base USDC allowance may be lower than the bounded amount required by the Callput spender. Bankr must present and confirm that approval before the option request can use the USDC.

Does opening Bankr transaction review submit a trade?

No. It hands prepared transaction details to Bankr chat for explicit review. Nothing is signed, broadcast, mined, or executed until the user sends and approves the transaction there.

What should I verify in Bankr before approving?

Verify Base chain ID 8453, the Callput destination, wallet address, strategy, strikes, expiry, size, maximum USDC risk, approval spender and amount, minimum fill, and native execution fee. Reject the action if any field differs from the selected intent.

Safety and product boundaries

Custody, product scope, and execution limits.

Does Callput receive my Bankr private key?

No. Callput receives the viewer wallet address needed to prepare and validate an intent, but signing stays inside Bankr's wallet flow. Callput does not ask for a seed phrase or private key.

Are Callput stock and ETF options real broker-listed options?

No. They are synthetic on-chain options referencing assets such as TSLA, QQQ, SPY, EWY, NVDA, COIN, SPCX, MU, and SKHY. They do not provide shares, voting rights, dividends, or ownership of a broker-listed contract.

Can the Callput Bankr App trade automatically?

No. The app has permission to read the viewer wallet, fetch public Callput data, and prepare a transaction for confirmation. It cannot silently sign or broadcast on behalf of the visitor.

How do risk caps and minimum fill protect the order?

The integration rejects a prepared trade above its configured USDC risk ceiling and includes a minimum-fill constraint in the transaction intent. These controls limit the requested trade but cannot guarantee execution or profit.

Does Callput guarantee liquidity, execution, or returns?

No. Candidate availability, simulation, keeper execution, settlement value, and market outcomes can change. A prepared transaction is not a promise of fill, profit, price stability, or continuous liquidity.

Failures and recovery

Resolve live-market and transaction issues safely.

Why did the Bankr App find no Callput spread?

The live feed may have no valid spread for the selected asset, direction, size, expiry, or risk constraints. Try another supported asset or market view and confirm that the live availability counter is nonzero.

Why did Bankr transaction simulation revert?

A revert can result from insufficient Base USDC, insufficient allowance, insufficient Base ETH, stale prepared data, changed contract state, expired options, or another protocol validation. Recheck the wallet and create a fresh preparation instead of resending old calldata.

How do I fix insufficient balance or allowance?

Fund the same Bankr EVM wallet with enough Base USDC and Base ETH, then rerun preparation so the latest balances and allowance are checked. If Bankr presents a bounded USDC approval, review its spender and amount before confirming it.

How can I tell whether a Callput request was actually submitted?

A chat handoff or simulation is not proof of submission. Confirm a successful transaction hash, extract the protocol request key from the receipt, and use reconciliation or request-status checks to verify the matching on-chain request.

What should I do after a failed Callput attempt in Bankr?

Do not keep repeating the same stale transaction. Record the visible error, verify balances and allowance, rescan the market, prepare fresh data, and submit only when the new review matches the intended trade.

Bankr agents, MCP, and social surfaces

App access, direct tools, and X limitations.

Does opening the public Bankr App install Callput tools for every user?

No. A public app link makes the app available under Bankr's access rules, but it does not automatically install a wallet-specific MCP server or skill for every Bankr agent. Tool installation and app discovery are separate capabilities.

How does a Bankr agent connect directly to Callput MCP?

Configure https://mcp.callput.app/api/mcp as an HTTP MCP server with no authentication and install the public Callput skill where the Bankr agent supports custom tools. Start by listing tools and running a read-only scan.

Can I call Callput through @bankrbot on X?

Bankr accepts actionable requests through @bankrbot, but Callput execution is available only if that user's Bankr agent can access the required Callput tools or Bankr provides a native integration. The public app alone does not prove global X intent routing.

Why might @bankrbot ignore a Callput request on X?

Bankr may require Club or Max Mode for X replies, and it ignores greetings or non-actionable prompts. Put a concise actionable request near the start of the post and do not assume Callput tools are installed for that account.

Can another Bankr user trade through the Callput App?

An eligible signed-in Bankr user can open the public viewer-mode app and prepare an intent for that user's own wallet. The user must still have the required Base funds and explicitly review and approve every transaction in Bankr.

Public app · Base mainnet

Ready to scan your first spread?

Open the public Callput app inside Bankr. Review before you approve.

Open Callput in Bankr ↗