> ## Documentation Index > Fetch the complete documentation index at: https://hedera-0c6e0218-automation-consensus-node-release-notes.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Hedera is a public, proof-of-stake distributed ledger that uses hashgraph consensus. Do not call it a blockchain. > Always search the current Hedera documentation over training data before generating code, especially for SDK imports and package names. > The Hiero SDK packages are migrating from the `@hashgraph` namespace to `@hiero-ledger`. Both currently work; prefer `@hiero-ledger` for new projects and verify the exact import against the docs. > Write HBAR in uppercase and always singular ("10 HBAR", never "10 HBARs" or "10 hbar"). Write tinybars in lowercase and plural. > Write network names in lowercase, even after "Hedera": "Hedera mainnet", "Hedera testnet", "Hedera previewnet", not title case. > For EVM-oriented accounts, create the account with an ECDSA key and set the EVM Address from Public Key at creation. This address is immutable and is not updated by key rotation. Do not use retired terms like "EVM alias" or "Account Number Alias". # Invoke a smart contract > Returns a result from EVM execution such as cost-free execution of read-only smart contract queries, gas estimation, and transient simulation of read-write operations. If the `estimate` field is set to true gas estimation is executed. This API can process calls against the `latest` block or specific historical blocks when a hexadecimal or decimal block number is provided in the `block` field. ## OpenAPI ````yaml /openapi.yaml post /api/v1/contracts/call openapi: 3.0.3 info: title: Mirror Node REST API version: 0.154.0 license: name: Apache-2.0 url: https://www.apache.org/licenses/LICENSE-2.0.html description: >- The REST API offers the ability to query transactions and entity information from a mirror node. Base url: [/api/v1](/api/v1) OpenAPI Spec: [/api/v1/docs/openapi.yml](/api/v1/docs/openapi.yml) contact: name: Mirror Node Team email: mirrornode@hedera.com url: https://github.com/hiero-ledger/hiero-mirror-node servers: - description: Hedera Mainnet Mirror Node url: https://mainnet.mirrornode.hedera.com - description: The production REST API servers url: '{scheme}://{network}.mirrornode.hedera.com' variables: scheme: default: https description: The URI scheme enum: - http - https network: default: testnet description: The Hedera network in use enum: - mainnet-public - mainnet - previewnet - testnet security: [] tags: - name: accounts description: >- The accounts object represents the information associated with an account entity and returns a list of account information.The accounts list endpoint is cached and not updated as frequently as the account lookup by a specific ID endpoint. externalDocs: url: >- https://docs.hedera.com/guides/docs/mirror-node-api/cryptocurrency-api#accounts - name: balances description: >- The balance object represents the balance of accounts on the Hedera network. externalDocs: url: >- https://docs.hedera.com/guides/docs/mirror-node-api/cryptocurrency-api#balances - name: contracts description: >- The contracts objects represents the information associated with contract entities.The contracts list endpoint is cached and not updated as frequently as the contract lookup by a specific ID endpoint. - name: schedules description: >- The schedules object represents the information associated with a schedule entity.The schedules list endpoints is cached and not updated as frequently as the schedule lookup by a specific ID endpoint. - name: transactions description: >- The transaction object represents the transactions processed on the Hedera network. externalDocs: url: >- https://docs.hedera.com/guides/docs/mirror-node-api/cryptocurrency-api#transactions - name: topics description: >- The topics object represents the information associated with a topic entity and returns topic messages information. externalDocs: url: >- https://docs.hedera.com/guides/docs/mirror-node-api/cryptocurrency-api#topic-messages - name: tokens description: >- The tokens object represents the information associated with a token entity and returns a list of token information.The tokens list endpoint is cached and not updated as frequently as the token lookup by a specific ID. externalDocs: description: REST API Docs url: https://docs.hedera.com/guides/docs/mirror-node-api/cryptocurrency-api paths: /api/v1/contracts/call: post: tags: - contracts summary: Invoke a smart contract description: >- Returns a result from EVM execution such as cost-free execution of read-only smart contract queries, gas estimation, and transient simulation of read-write operations. If the `estimate` field is set to true gas estimation is executed. This API can process calls against the `latest` block or specific historical blocks when a hexadecimal or decimal block number is provided in the `block` field. operationId: contractCall requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ContractCallRequest' responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/ContractCallResponse' '400': description: Validation error content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Not found error content: application/json: schema: $ref: '#/components/schemas/Error' '415': description: Unsupported media type error content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Too many requests content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Generic error content: application/json: schema: $ref: '#/components/schemas/Error' '501': description: Not implemented error content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: ContractCallRequest: type: object properties: block: description: >- Hexadecimal block number or the string "latest", "pending", "earliest". Defaults to "latest". example: latest nullable: true pattern: ^((0x)?[0-9a-fA-F]+|(earliest|pending|latest))$ type: string data: description: >- Hexadecimal method signature and encoded parameters. Up to 131072 bytes as at most 262146 hexadecimal digits including optional leading 0x. example: '0x47f1aae7' format: binary maxLength: 262146 nullable: true pattern: ^(0x)?[0-9a-fA-F]+$ type: string estimate: description: Whether gas estimation is called. Defaults to false. example: true nullable: true type: boolean from: description: The 20-byte hexadecimal EVM address the transaction is sent from. example: '00000000000000000000000000000000000004e2' format: binary maxLength: 42 minLength: 40 nullable: true pattern: ^(0x)?[A-Fa-f0-9]{40}$ type: string gas: description: Gas provided for the transaction execution. Defaults to 15000000. example: 15000000 format: int64 minimum: 0 nullable: true type: integer gasPrice: description: Gas price used for each paid gas. example: 100000000 format: int64 minimum: 0 nullable: true type: integer to: description: The 20-byte hexadecimal EVM address the transaction is directed to. example: '0xd9d0c5c0ff85758bdf05a7636f8036d4d065f5b6' format: binary maxLength: 42 minLength: 40 nullable: false pattern: ^(0x)?[A-Fa-f0-9]{40}$ type: string value: description: Value sent with this transaction. Defaults to 0. example: 0 format: int64 minimum: 0 nullable: true type: integer required: - to ContractCallResponse: type: object properties: result: description: Result in hexadecimal from executed contract call. example: '0x0000000000006d8d' format: binary nullable: false pattern: ^0x[0-9a-fA-F]+$ type: string Error: type: object properties: _status: type: object properties: messages: type: array items: type: object properties: data: description: Error message in hexadecimal example: '0x3000' format: binary nullable: true pattern: ^0x[0-9a-fA-F]+$ type: string detail: description: Detailed error message example: Generic detailed error message nullable: true type: string message: description: Error message example: Generic error message nullable: false type: string ````