> ## 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. # Get Ark server info > Returns the Ark server's configuration parameters, including network, public key, round interval, VTXO expiry and exit deltas, fee settings, and Lightning support details. ## OpenAPI ````yaml https://gitlab.com/ark-bitcoin/bark/-/raw/master/bark-rest/openapi.json get /api/v1/wallet/ark-info 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: 0.1.4 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: lightning description: Create Lightning invoices and track receives. - 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/wallet/ark-info: get: tags: - wallet summary: Get Ark server info description: >- Returns the Ark server's configuration parameters, including network, public key, round interval, VTXO expiry and exit deltas, fee settings, and Lightning support details. operationId: ark_info responses: '200': description: Returns the Ark info content: application/json: schema: $ref: '#/components/schemas/ArkInfo' '404': description: Wallet not connected to an Ark server content: application/json: schema: $ref: '#/components/schemas/NotFoundError' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/InternalServerError' components: schemas: ArkInfo: type: object required: - network - server_pubkey - mailbox_pubkey - round_interval - nb_round_nonces - vtxo_exit_delta - vtxo_expiry_delta - htlc_send_expiry_delta - htlc_expiry_delta - max_vtxo_amount - required_board_confirmations - max_user_invoice_cltv_delta - min_board_amount_sat - offboard_feerate_sat_per_kvb - ln_receive_anti_dos_required - fees - max_vtxo_exit_depth properties: fees: $ref: '#/components/schemas/FeeSchedule' description: >- The fee schedule outlining any fees that must be paid to interact with the Ark server. htlc_expiry_delta: $ref: '#/components/schemas/u16' description: >- The number of blocks to keep between Lightning and Ark HTLCs expiries htlc_send_expiry_delta: $ref: '#/components/schemas/u16' description: >- The number of blocks after which an HTLC-send VTXO expires once granted. ln_receive_anti_dos_required: type: boolean description: |- Indicates whether the Ark server requires clients to either provide a VTXO ownership proof, or a lightning receive token when preparing a lightning claim. mailbox_pubkey: type: string description: The pubkey used for blinding unified mailbox IDs max_user_invoice_cltv_delta: type: integer format: int32 description: |- Maximum CLTV delta server will allow clients to request an invoice generation with. minimum: 0 max_vtxo_amount: type: integer format: int64 description: Maximum amount of a VTXO minimum: 0 max_vtxo_exit_depth: type: integer format: int32 description: >- Maximum exit depth (genesis chain length) allowed for a VTXO. Once a VTXO's exit depth reaches this value the server will refuse to cosign further OOR transactions spending it. Clients should refresh their VTXOs into a round before this limit is reached. minimum: 0 min_board_amount_sat: type: integer format: int64 description: Minimum amount for a board the server will cosign minimum: 0 nb_round_nonces: type: integer description: Number of nonces per round minimum: 0 network: type: string description: The bitcoin network the server operates on offboard_feerate_sat_per_kvb: type: integer format: int64 description: offboard feerate in sat per kvb minimum: 0 required_board_confirmations: type: integer description: The number of confirmations required to register a board vtxo minimum: 0 round_interval: type: string description: The interval between each round server_pubkey: type: string description: The Ark server pubkey vtxo_exit_delta: $ref: '#/components/schemas/u16' description: Delta between exit confirmation and coins becoming spendable vtxo_expiry_delta: $ref: '#/components/schemas/u16' description: Expiration delta of the VTXO NotFoundError: type: object required: - resources - message properties: message: type: string resources: type: array items: type: string InternalServerError: type: object required: - message properties: message: type: string FeeSchedule: type: object description: Complete fee schedule for all operations. required: - board - offboard - refresh - lightning_receive - lightning_send properties: board: $ref: '#/components/schemas/BoardFees' lightning_receive: $ref: '#/components/schemas/LightningReceiveFees' lightning_send: $ref: '#/components/schemas/LightningSendFees' offboard: $ref: '#/components/schemas/OffboardFees' refresh: $ref: '#/components/schemas/RefreshFees' u16: type: integer format: int32 minimum: 0 BoardFees: type: object description: Fees for boarding the ark. required: - min_fee_sat - base_fee_sat - ppm properties: base_fee_sat: type: integer format: int64 description: A fee applied to every transaction regardless of value. minimum: 0 min_fee_sat: type: integer format: int64 description: Minimum fee to charge. minimum: 0 ppm: type: integer format: int64 description: >- PPM (parts per million) fee rate to apply based on the value of the transaction. minimum: 0 LightningReceiveFees: type: object description: Fees for lightning receive operations. required: - base_fee_sat - ppm properties: base_fee_sat: type: integer format: int64 description: A fee applied to every transaction regardless of value. minimum: 0 ppm: type: integer format: int64 description: >- PPM (parts per million) fee rate to apply based on the value of the transaction. minimum: 0 LightningSendFees: type: object description: Fees for lightning send operations. required: - min_fee_sat - base_fee_sat - ppm_expiry_table properties: base_fee_sat: type: integer format: int64 description: A fee applied to every transaction regardless of value. minimum: 0 min_fee_sat: type: integer format: int64 description: Minimum fee to charge. minimum: 0 ppm_expiry_table: type: array items: $ref: '#/components/schemas/PpmExpiryFeeEntry' description: >- A table mapping how soon a VTXO will expire to a PPM (parts per million) fee rate. The table should be sorted by each `expiry_blocks_threshold` value in ascending order. OffboardFees: type: object description: Fees for offboarding from the ark. required: - base_fee_sat - fixed_additional_vb - ppm_expiry_table properties: base_fee_sat: type: integer format: int64 description: A fee applied to every transaction regardless of value. minimum: 0 fixed_additional_vb: type: integer format: int64 description: >- Fixed number of virtual bytes charged offboard on top of the output size The fee for an offboard will be this value, plus the offboard output virtual size, multiplied with the offboard fee rate, plus the `base_fee`, and plus the additional fee calculated with the `ppm_expiry_table`. minimum: 0 ppm_expiry_table: type: array items: $ref: '#/components/schemas/PpmExpiryFeeEntry' description: >- A table mapping how soon a VTXO will expire to a PPM (parts per million) fee rate. The table should be sorted by each `expiry_blocks_threshold` value in ascending order. RefreshFees: type: object description: Fees for refresh operations. required: - base_fee_sat - ppm_expiry_table properties: base_fee_sat: type: integer format: int64 description: A fee applied to every transaction regardless of value. minimum: 0 ppm_expiry_table: type: array items: $ref: '#/components/schemas/PpmExpiryFeeEntry' description: >- A table mapping how soon a VTXO will expire to a PPM (parts per million) fee rate. The table should be sorted by each `expiry_blocks_threshold` value in ascending order. PpmExpiryFeeEntry: type: object description: >- Entry in a table to calculate the PPM (parts per million) fee rate of a transaction based on how new a VTXO is. required: - expiry_blocks_threshold - ppm properties: expiry_blocks_threshold: type: integer format: int32 description: >- A threshold for the number of blocks until a VTXO expires for the `ppm` amount to apply. As an example, if this value is set to 50 and a VTXO expires in 60 blocks, this [PpmExpiryFeeEntry] will be used to calculate the fee unless another entry exists with an `expiry_blocks_threshold` with a value between 51 and 60 (inclusive). minimum: 0 ppm: type: integer format: int64 description: PPM (parts per million) fee rate to apply for this expiry period. minimum: 0 securitySchemes: bearer: type: http scheme: bearer bearerFormat: AuthToken description: Base64url-encoded auth token ````