> ## Documentation Index > Fetch the complete documentation index at: https://docs.beaconcha.in/llms.txt > Use this file to discover all available pages before exploring further. # Attester slashings for a slot > Retrieve all attester slashing operations included in the beacon block for a specific slot. You can provide a slot number or the keyword `latest` to fetch from the most recently processed slot. Each item contains the two conflicting attestations that triggered the slashing and the block inclusion metadata. ## OpenAPI ````yaml /api/v1/bundled.yaml get /api/v1/slot/{slot}/attesterslashings openapi: 3.0.4 info: title: beaconcha.in API Documentation license: name: GPL-3.0 url: https://www.gnu.org/licenses/gpl-3.0.en.html description: >- > ⚠️ No new features or endpoints will be added to V1. We recommend the [V2 API](/api/overview) for all new projects. See the [migration guide](/api/v1-to-v2-migration). ## Introduction **Advanced and reliable API for accessing comprehensive Ethereum blockchain data.** - **Free Usage Policy:** The API is free to use under a fair use policy, with rate limits of 10 requests per minute per IP. - **Caching:** All responses are cached for 1 minute. - **Higher Usage Plans:** For higher usage plans, visit: [https://beaconcha.in/pricing](https://beaconcha.in/pricing). An API key is required to use these plans. ### API Key Usage API keys can be obtained at [/user/settings](https://beaconcha.in/user/settings) and must be included in requests either as a query string parameter or in the request header. #### Example: Query String Parameter ```bash curl https://beaconcha.in/api/v1/slot/1?apikey= ``` #### Example: Request Header ```bash curl -H 'apikey: ' https://beaconcha.in/api/v1/slot/1 ``` contact: {} version: '1.1' servers: - url: https://beaconcha.in description: Ethereum mainnet - url: https://hoodi.beaconcha.in description: Hoodi Ethereum testnet security: - ApiKeyAuthQuery: [] - ApiKeyAuthHeader: [] tags: - name: Epoch description: Data related to consensus layer epochs - name: Slots description: Data related to consensus layer slots - name: Validators description: Data related to consensus layer validators - name: Rewards description: Data related to validator rewards - name: Sync Committees description: Data related to sync committees - name: Rocketpool description: Data related to the rocketpool protocol - name: ETH.Store® description: Data related to the ETH.Store® metric - name: Validator deposits description: Data related to execution layer validator deposits - name: Blocks description: Data related to execution layer blocks - name: Gas description: Data related to gas prices - name: Address description: Data related to ethereum addresses - name: Network description: Network data - name: Misc description: Miscellaneous data - name: User description: User data - name: Machine Metrics description: Submit machine, beacon-node, and validator-client monitoring metrics paths: /api/v1/slot/{slot}/attesterslashings: get: tags: - Slots summary: Attester slashings for a slot description: >- Retrieve all attester slashing operations included in the beacon block for a specific slot. You can provide a slot number or the keyword `latest` to fetch from the most recently processed slot. Each item contains the two conflicting attestations that triggered the slashing and the block inclusion metadata. operationId: listSlotAttesterSlashings parameters: - name: slot in: path description: >- The slot to fetch. Provide an integer slot number (>= 0) or the special tag `latest` for the most recently processed slot. required: true style: simple explode: false schema: oneOf: - type: integer minimum: 0 description: Slot number (>= 0) example: 12751688 - type: string enum: - latest description: Latest processed slot example: latest responses: '200': description: >- The slot was found and its attester slashings are returned in the `data` array. If the slot has no attester slashings, the array is empty. content: application/json: schema: allOf: - $ref: '#/components/schemas/types.ApiResponse' - type: object properties: data: type: array items: $ref: >- #/components/schemas/types.APIAttesterSlashingResponse '400': description: >- The request is invalid (for example, a negative slot or a slot in the future). content: application/json: schema: $ref: '#/components/schemas/types.ApiErrorResponse' examples: invalidSlot: summary: Invalid slot parameter value: status: 'ERROR: invalid slot parameter' data: null slotInFuture: summary: Slot in the future value: status: 'ERROR: slot is in the future' data: null '500': description: An unexpected server error occurred while processing your request. content: application/json: schema: $ref: '#/components/schemas/types.ApiErrorResponse' examples: serverError: summary: Internal error value: status: 'ERROR: internal server error' data: null components: schemas: types.ApiResponse: type: object description: Standard success envelope used by all API endpoints. properties: status: type: string description: >- HTTP-independent status of the API operation. For successful responses this is always "OK". enum: - OK data: description: Response payload specific to the endpoint. nullable: true x-omitempty: true types.APIAttesterSlashingResponse: type: object description: >- Attester slashing operation included in a beacon block. Contains two conflicting attestations (attestation1 and attestation2) that prove a slashable offense, plus block inclusion metadata. properties: attestation1_beaconblockroot: type: string description: >- Root of the beacon block being voted on by attestation1 (0x-prefixed, 32-byte hex). example: '0x4b50f7112f30b4fe9ff61324d9282308b8104874991f796f181cd58511fc67d5' attestation1_index: type: integer description: Committee index within the epoch for attestation1 (>= 0). minimum: 0 example: 0 attestation1_indices: type: array description: >- List of validator indices whose signatures are included in attestation1. items: type: integer minimum: 0 example: - 0 - 1 - 2 - 3 attestation1_signature: type: string description: >- Aggregated BLS signature over the attestation1 data (96 bytes; 0x-prefixed hex with 192 hex characters). example: '0xaa' attestation1_slot: type: integer description: Slot that attestation1 attests to. minimum: 0 example: 12571716 attestation1_source_epoch: type: integer description: Source checkpoint epoch of attestation1 (>= 0). minimum: 0 example: 392865 attestation1_source_root: type: string description: >- Root of the source checkpoint referenced by attestation1 (0x-prefixed, 32-byte hex). example: '0x1b3891944d7c2fdac53dff9410f18992487e31b1f68d995c1429548effa47268' attestation1_target_epoch: type: integer description: Target checkpoint epoch of attestation1 (>= 0). minimum: 0 example: 392866 attestation1_target_root: type: string description: >- Root of the target checkpoint referenced by attestation1 (0x-prefixed, 32-byte hex). example: '0x1898ff52ee440f1ac1ed328becaaa2672c6c50976203d42f672beb5c495c8116' attestation2_beaconblockroot: type: string description: >- Root of the beacon block being voted on by attestation2 (0x-prefixed, 32-byte hex). example: '0x2c262c5cdbddd4b4a673c3a112b8a0d1ca539c15cac2a95e0094c0d28a008e88' attestation2_index: type: integer description: Committee index within the epoch for attestation2 (>= 0). minimum: 0 example: 0 attestation2_indices: type: array description: >- List of validator indices whose signatures are included in attestation2. items: type: integer minimum: 0 example: - 0 - 1 - 2 - 3 attestation2_signature: type: string description: >- Aggregated BLS signature over the attestation2 data (96 bytes; 0x-prefixed hex with 192 hex characters). example: '0xaa' attestation2_slot: type: integer description: Slot that attestation2 attests to. minimum: 0 example: 12571716 attestation2_source_epoch: type: integer description: Source checkpoint epoch of attestation2 (>= 0). minimum: 0 example: 392865 attestation2_source_root: type: string description: >- Root of the source checkpoint referenced by attestation2 (0x-prefixed, 32-byte hex). example: '0x1b3891944d7c2fdac53dff9410f18992487e31b1f68d995c1429548effa47268' attestation2_target_epoch: type: integer description: Target checkpoint epoch of attestation2 (>= 0). minimum: 0 example: 392866 attestation2_target_root: type: string description: >- Root of the target checkpoint referenced by attestation2 (0x-prefixed, 32-byte hex). example: '0x1898ff52ee440f1ac1ed328becaaa2672c6c50976203d42f672beb5c495c8116' block_index: type: integer description: >- Zero-based index of this attester slashing within the including block’s attester_slashings list. minimum: 0 example: 0 block_root: type: string description: >- Root of the beacon block that included this attester slashing (0x-prefixed, 32-byte hex). example: '0x3381dd071cb6a020144bb980758a3a844129a62d74146b0fcdd82c4125cc8d66' block_slot: type: integer description: Slot number of the block that included this attester slashing. minimum: 0 example: 12571718 types.ApiErrorResponse: type: object description: Standard error envelope returned when a request fails. properties: status: type: string description: >- Human-readable error indicator and message. The value begins with "ERROR:" followed by details. example: 'ERROR: ' data: type: string description: Optional additional context for the error. Null in most cases. nullable: true default: null securitySchemes: ApiKeyAuthQuery: type: apiKey in: query name: apikey description: '' ApiKeyAuthHeader: type: apiKey in: header name: apikey description: '' ````