> ## 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. # Attestations for a slot > Retrieve all attestations included in the beacon block for a specific slot. You can provide a slot number or the keyword `latest` to fetch attestations from the most recently processed slot. The response lists each aggregated attestation with its source/target checkpoints, committee index, and the participating validators. ## OpenAPI ````yaml /api/v1/bundled.yaml get /api/v1/slot/{slot}/attestations 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}/attestations: get: tags: - Slots summary: Attestations for a slot description: >- Retrieve all attestations included in the beacon block for a specific slot. You can provide a slot number or the keyword `latest` to fetch attestations from the most recently processed slot. The response lists each aggregated attestation with its source/target checkpoints, committee index, and the participating validators. operationId: listSlotAttestations 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 attestations are returned in the `data` array. If the slot has no attestations, 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.APIAttestationResponse' '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.APIAttestationResponse: type: object description: >- Aggregated attestation included in a beacon block, with committee and checkpoint metadata. properties: aggregationbits: type: string description: >- Bitfield indicating which committee members participated in this attestation. Encoded as 0x-prefixed hexadecimal representing the SSZ bitlist; one bit per member (1 = participated). example: '0xff' beaconblockroot: type: string description: >- Root of the beacon block being voted on (head block) as referenced by the attestation data (0x-prefixed, 32-byte hex). example: '0x94677296757527ccfd5849a6c07d179a9ed783a771c7bb305b9b9350fffd97d0' block_index: type: integer description: >- Zero-based index of this attestation within the including block’s attestation list. example: 1 block_root: type: string description: >- Root of the beacon block that included this attestation (0x-prefixed, 32-byte hex). example: '0xfa4349ae9843b52cd7e9ff42e43deaf3a9220c0ae3f3dd64da9c2c97544dfd4c' block_slot: type: integer description: Slot number of the block that included this attestation. example: 12751688 committeeindex: type: integer description: Committee index within the epoch for the attestation’s slot (>= 0). minimum: 0 example: 1 signature: type: string description: >- Aggregated BLS signature over the attestation data (96 bytes; 0x-prefixed hex with 192 hex characters). example: '0xaa' slot: type: integer description: Slot that this attestation attests to (attestation data slot). example: 12751687 source_epoch: type: integer description: Source checkpoint epoch of the attestation (>= 0). minimum: 0 example: 398489 source_root: type: string description: Root of the source checkpoint (0x-prefixed, 32-byte hex). example: '0x1c2bfaa61c0f5f7a8f8e3a16f6d0f1d4b3f2a1c0b9a8d7c6e5f4d3c2b1a0f9e8' target_epoch: type: integer description: Target checkpoint epoch of the attestation (>= 0). minimum: 0 example: 398490 target_root: type: string description: Root of the target checkpoint (0x-prefixed, 32-byte hex). example: '0x88f88f748227a397a09a7b8cbe13dab1d0411950993e618fc7a6d76d1d7d0c76' validators: type: array description: >- List of validator indices whose signatures are included in this aggregated attestation. items: type: integer minimum: 0 example: - 0 - 1 - 2 - 3 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: '' ````