> ## Documentation Index > Fetch the complete documentation index at: https://second.tech/docs/llms.txt > Use this file to discover all available pages before exploring further. # Estimate emergency exit fee > Estimates the on-chain cost of unilaterally (emergency) exiting a set of VTXOs without server cooperation. The breakdown separates the broadcast cost—CPFP-bumping every not-yet-confirmed transaction in each VTXO's exit tree, paid now from confirmed on-chain funds—from the claim cost of the single batched transaction that later drains the matured outputs. The estimate reflects current chain state, so exit transactions already confirmed cost nothing. `fundable` is false when the wallet's confirmed on-chain balance can't cover the full broadcast walk, which would stall the exit midway. ## OpenAPI ````yaml https://gitlab.com/ark-bitcoin/bark/-/raw/master/bark-rest/openapi.json get /api/v1/exits/fee openapi: 3.1.0 info: title: barkd REST API description: >- A simple REST API for barkd, a wallet daemon for integrating bitcoin payments into your app over HTTP. Supports self-custodial Lightning, Ark, and on-chain out of the box. barkd is a long-running daemon best suited for always-on or high-connectivity environments like nodes, servers, desktops, and point-of-sale terminals. All endpoints return JSON. Amounts are denominated in satoshis. contact: name: Second Team email: hello@second.tech license: name: MIT identifier: MIT version: 0.6.0 servers: [] security: - bearer: [] tags: - name: boards description: Move on-chain bitcoin onto the Ark protocol. - name: exits description: Move bitcoin back on-chain without server cooperation. - name: fees description: Estimate fees for wallet operations before executing them. - name: history description: Inspect and annotate wallet movement history. - name: lightning description: Create Lightning invoices and track receives. - name: message description: Sign arbitrary messages with the wallet's keys and verify signed messages. - name: onchain description: Manage barkd's on-chain bitcoin wallet. - name: wallet description: Manage Ark balances and VTXOs, send payments via Ark, LN, and on-chain. - name: bitcoin description: Query bitcoin network data. - name: notifications description: Receive real-time notifications from barkd. paths: /api/v1/exits/fee: get: tags: - exits summary: Estimate emergency exit fee description: >- Estimates the on-chain cost of unilaterally (emergency) exiting a set of VTXOs without server cooperation. The breakdown separates the broadcast cost—CPFP-bumping every not-yet-confirmed transaction in each VTXO's exit tree, paid now from confirmed on-chain funds—from the claim cost of the single batched transaction that later drains the matured outputs. The estimate reflects current chain state, so exit transactions already confirmed cost nothing. `fundable` is false when the wallet's confirmed on-chain balance can't cover the full broadcast walk, which would stall the exit midway. operationId: emergency_exit_fee parameters: - name: vtxo_ids in: query description: Comma-separated VTXO ids to exit; omit to exit the entire wallet required: false schema: type: string - name: fee_rate_sat_per_vb in: query description: >- Fee rate in sat/vB applied to both legs; omit to price the broadcast leg at the current fast rate and the claim leg at the regular rate required: false schema: type: integer format: int64 minimum: 0 - name: destination in: query description: Claim destination address; omit to use a placeholder for weighing required: false schema: type: string responses: '200': description: Returns the emergency exit fee breakdown content: application/json: schema: $ref: '#/components/schemas/EmergencyExitFeeEstimateResponse' '400': description: >- A VTXO is unknown, dust, already exited, or already spent, or a parameter is invalid content: application/json: schema: $ref: '#/components/schemas/BadRequestError' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/InternalServerError' components: schemas: EmergencyExitFeeEstimateResponse: type: object description: A fee breakdown for unilaterally (emergency) exiting a set of VTXOs. required: - exit_broadcast_fee_sat - claim_fee_sat - total_fee_sat - fee_rate_sat_per_vb - txs_to_broadcast - fundable properties: claim_fee_sat: type: integer format: int64 description: >- The fee for the single batched transaction that drains the matured exit outputs (in satoshis). Paid later out of the recovered value. minimum: 0 exit_broadcast_fee_sat: type: integer format: int64 description: >- The CPFP fees to broadcast every not-yet-confirmed exit transaction (in satoshis). Paid now from confirmed on-chain funds. minimum: 0 fee_rate_sat_per_vb: type: integer format: int64 description: >- The fee rate the exit-broadcast leg was priced at (sat/vB). Unless an explicit fee rate was supplied, the claim leg is priced separately at the chain's `regular` rate. minimum: 0 fundable: type: boolean description: >- Whether the wallet's current on-chain balance covers the full serial exit-broadcast walk. total_fee_sat: type: integer format: int64 description: The sum of the broadcast and claim fees (in satoshis). minimum: 0 txs_to_broadcast: type: integer description: >- The number of exit transactions that still need to be broadcast and CPFP-bumped. minimum: 0 BadRequestError: type: object required: - message properties: message: type: string InternalServerError: type: object required: - message properties: message: type: string securitySchemes: bearer: type: http scheme: bearer bearerFormat: AuthToken description: Base64url-encoded auth token ````