Meter Native RESTful API (Meterest)

openapi: 3.0.1
info:
  title: Meterest
  description: |
    RESTful API to access Meter.io

    [Project Home](https://github.com/meterio)
  license:
    name: LGPL 3.0
    url: "https://www.gnu.org/licenses/lgpl-3.0.en.html"
  version: 1.2.2

servers:
  - url: "/"
    description: local meter node

tags:
  - name: Accounts
    description: Access to account objects
  - name: Transactions
    description: Access to transactions
  - name: Blocks
    description: Access to blocks
  - name: Logs
    description: Access to event & transfer logs
  - name: Node
    description: Access to node status info
  - name: Subscriptions
    description: Subscribe interested subjects
  - name: Debug
    description: Debug utilities
  - name: Staking
    description: Access to staking data

paths:
  /accounts/{address}:
    parameters:
      - $ref: "#/components/parameters/AddressInPath"
      - $ref: "#/components/parameters/RevisionInQuery"
    get:
      tags:
        - Accounts
      summary: Retrieve account detail
      description: |
        includes `balance`, `energy` and `hasCode`, by account `address`. An account with `hasCode` be *true* is a contract.

        Historical account detail can be queried by specifying `revision` query string.
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Account"

    post:
      tags:
        - Accounts
      summary: Execute account code
      description: |
        to simulate contract method call, without sending transaction to block chain.

        It's useful to estimate gas usage and execution result of a clause.
      requestBody:
        description: arguments and environment
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/CallData"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CallResult"
  /accounts/*:
    post:
      parameters:
        - $ref: "#/components/parameters/RevisionInQuery"
      tags:
        - Accounts
      summary: Execute a batch of codes
      description: |
        to simulate execution of a transaction.
      requestBody:
        description: arguments and environment
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/BatchCallData"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/BatchCallResult"

  /accounts:
    post:
      parameters:
        - $ref: "#/components/parameters/RevisionInQuery"
      tags:
        - Accounts
      summary: Execute bytecodes
      description: |
        to simulate contract deployment without sending transaction to block chain.

        It's useful to estimate gas usage and contract deployment result of a clause.

        ### TIPS:
          - `data` in request body is the bytecodes of a contract
          - `data` in response body is the runtime bytecodes assigned to account which the contract to be deployed
      requestBody:
        description: arguments and environment
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/CallData"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CallResult"

  /accounts/{address}/code:
    parameters:
      - $ref: "#/components/parameters/AddressInPath"
      - $ref: "#/components/parameters/RevisionInQuery"
    get:
      tags:
        - Accounts
      summary: Retrieve account code
      description: |
        if any. Here the code is runtime bytecodes.
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Code"

  /accounts/{address}/storage/{key}:
    parameters:
      - $ref: "#/components/parameters/AddressInPath"
      - $ref: "#/components/parameters/StorageKeyInPath"
      - $ref: "#/components/parameters/RevisionInQuery"
    get:
      tags:
        - Accounts
      summary: Retrieve account storage value
      description: |
        for given key.
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Storage"

  /transactions/{id}:
    parameters:
      - $ref: "#/components/parameters/TxIDInPath"
      - $ref: "#/components/parameters/RawInQuery"
      - $ref: "#/components/parameters/HeadInQuery"
    get:
      tags:
        - Transactions
      summary: Retrieve transaction
      description: |
        by ID.
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/TxOrRawTxWithMeta"

  /transactions/{id}/receipt:
    parameters:
      - $ref: "#/components/parameters/TxIDInPath"
      - $ref: "#/components/parameters/HeadInQuery"
    get:
      tags:
        - Transactions
      summary: Retrieve transaction receipt
      description: |
        by ID.
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Receipt"

  /transactions:
    post:
      tags:
        - Transactions
      summary: Commit transaction
      description: |
        in raw or structured format. If no signature in structured format,
        `signingHash` is returned in response body.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/RawOrSignedOrUnsignedTx"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/IDOrSigningHash"

  /blocks/{revision}:
    parameters:
      - $ref: "#/components/parameters/RevisionInPath"
    get:
      tags:
        - Blocks
      summary: Retrieve block
      description: |
        by ID or number, or 'best' for latest block.
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                allOf:
                  - $ref: "#/components/schemas/Block"
                  - type: object
                    properties:
                      isTrunk:
                        type: boolean
                        description: whether the block is on th trunk

  /logs/event:
    post:
      tags:
        - Logs
      summary: Filter event logs
      description: |
        Event logs are produced by `OP_LOG` in EVM.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/EventFilter"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  allOf:
                    - $ref: "#/components/schemas/Event"
                    - type: object
                      properties:
                        meta:
                          $ref: "#/components/schemas/LogMeta"

  /logs/transfer:
    post:
      tags:
        - Logs
      summary: Filter transfer logs
      description: |
        Transfer logs are recorded on MTRG transferring.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/TransferFilter"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  allOf:
                    - $ref: "#/components/schemas/Transfer"
                    - type: object
                      properties:
                        meta:
                          $ref: "#/components/schemas/LogMeta"

  /logs/events:
    post:
      deprecated: true
      tags:
        - Logs
      summary: Filter event logs
      description: |
        Event logs are produced by `OP_LOG` in EVM.
      parameters:
        - $ref: "#/components/parameters/FilterOrderInQuery"
        - $ref: "#/components/parameters/FilterAddressInQuery"
      requestBody:
        description: event filter criteria
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/EventFilterLegacy"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  allOf:
                    - $ref: "#/components/schemas/Event"
                    - type: object
                      properties:
                        meta:
                          $ref: "#/components/schemas/LogMeta"

  /logs/transfers:
    post:
      deprecated: true
      tags:
        - Logs
      summary: Filter transfer logs
      description: |
        Transfer logs are recorded on MTR transferring.
      parameters:
        - $ref: "#/components/parameters/FilterOrderInQuery"
      requestBody:
        description: transfer log filter criteria
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/TransferFilterLegacy"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  allOf:
                    - $ref: "#/components/schemas/Transfer"
                    - type: object
                      properties:
                        meta:
                          $ref: "#/components/schemas/LogMeta"

  /events:
    post:
      deprecated: true
      tags:
        - Logs
      summary: Filter event logs
      parameters:
        - $ref: "#/components/parameters/FilterOrderInQuery"
        - $ref: "#/components/parameters/FilterAddressInQuery"
      requestBody:
        description: event filter criteria
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/EventFilterLegacy"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  allOf:
                    - $ref: "#/components/schemas/Event"
                    - type: object
                      properties:
                        meta:
                          $ref: "#/components/schemas/LogMeta"

  /transfers:
    post:
      deprecated: true
      tags:
        - Logs
      summary: Filter transfer logs
      parameters:
        - $ref: "#/components/parameters/FilterOrderInQuery"
      requestBody:
        description: transfer log filter criteria
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/TransferFilterLegacy"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  allOf:
                    - $ref: "#/components/schemas/Transfer"
                    - type: object
                      properties:
                        meta:
                          $ref: "#/components/schemas/LogMeta"

  /node/network/peers:
    get:
      tags:
        - Node
      summary: Retrieve connected peers
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                items:
                  $ref: "#/components/schemas/PeerStats"

  /node/consensus/committee:
    get:
      tags:
        - Node
      summary: Retrieve current committee members
      reponses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                items:
                  $ref:

  /staking/buckets:
    get:
      tags:
        - Staking
      summary: Retrieve staking buckets
      reponses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                items:
                  $ref:

  /staking/candidates:
    get:
      tags:
        - Staking
      summary: Retrieve staking candidates
      reponses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                items:
                  $ref:

  /staking/stakeholders:
    get:
      tags:
        - Staking
      summary: Retrieve staking stakeholder
      reponses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                items:
                  $ref:

  /staking/delegates:
    get:
      tags:
        - Staking
      summary: Retrieve staking delegates for consensus
      reponses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                items:
                  $ref:

  /subscriptions/block:
    get:
      tags:
        - Subscriptions
      summary: (Websocket) Subscribe new blocks
      parameters:
        - $ref: "#/components/parameters/PositionInQuery"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                allOf:
                  - $ref: "#/components/schemas/Block"
                  - $ref: "#/components/schemas/Obsolete"

  /subscriptions/event:
    get:
      tags:
        - Subscriptions
      summary: (Websocket) Subscribe new events
      description: |
        which satisfy criteria in query.

      parameters:
        - $ref: "#/components/parameters/PositionInQuery"
        - name: addr
          in: query
          schema:
            type: string
          description: address of event emitter
        - name: t0
          in: query
          schema:
            type: string
          description: topic0 of event
        - name: t1
          in: query
          schema:
            type: string
          description: topic1 of event
        - name: t2
          in: query
          schema:
            type: string
          description: topic2 of event
        - name: t3
          in: query
          schema:
            type: string
          description: topic3 of event
        - name: t4
          in: query
          schema:
            type: string
          description: topic4 of event
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                allOf:
                  - $ref: "#/components/schemas/Event"
                  - $ref: "#/components/schemas/Obsolete"
                  - type: object
                    properties:
                      meta:
                        $ref: "#/components/schemas/LogMeta"

  /subscriptions/transfer:
    get:
      tags:
        - Subscriptions
      summary: (Websocket) Subscribe new transfers
      description: |
        which satisfy criteria in query.
      parameters:
        - $ref: "#/components/parameters/PositionInQuery"
        - name: txOrigin
          in: query
          schema:
            type: string
          description: signer address of tx which contains the transfer
        - name: sender
          in: query
          schema:
            type: string
          description: address of token sender
        - name: recipient
          in: query
          schema:
            type: string
          description: address of token recipient
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                allOf:
                  - $ref: "#/components/schemas/Transfer"
                  - $ref: "#/components/schemas/Obsolete"
                  - type: object
                    properties:
                      meta:
                        $ref: "#/components/schemas/LogMeta"

  /subscriptions/beat:
    get:
      tags:
        - Subscriptions
      summary: (Websocket) Subscribe block chain's beats
      description: |
        which contain summary of new blocks, and bloom filters that composited with affected addresses.
      parameters:
        - $ref: "#/components/parameters/PositionInQuery"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                allOf:
                  - $ref: "#/components/schemas/Beat"
                  - $ref: "#/components/schemas/Obsolete"

  /debug/tracers:
    post:
      tags:
        - Debug
      summary: Create a tracer
      description: for a clause
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/TracerOption"

      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: object

  /debug/storage-range:
    post:
      tags:
        - Debug
      summary: Retrieve storage range
      description: |
        of the account with given address
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/StorageRangeOption"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/StorageRange"

components:
  schemas:
    Account:
      properties:
        balance:
          type: string
          description: balance in unit WEI, presented with hex string
          example: "0x47ff1f90327aa0f8e"
        energy:
          type: string
          description: energy in uint WEI, presented with hex string
          example: "0xcf624158d591398"
        hasCode:
          type: boolean
          description: whether the account has code
          example: false

    Code:
      properties:
        code:
          type: string
          example: "0x6060604052600080fd00a165627a7a72305820c23d3ae2dc86ad130561a2829d87c7cb8435365492bd1548eb7e7fc0f3632be90029"

    Storage:
      properties:
        value:
          type: string
          example: "0x0000000000000000000000000000000000000000000000000000000000000001"

    TxMeta:
      description: transaction meta info
      properties:
        blockID:
          type: string
          description: block identifier (bytes32)
          example: "0x0004f6cc88bb4626a92907718e82f255b8fa511453a78e8797eb8cea3393b215"
        blockNumber:
          type: integer
          format: uint32
          description: block number (height)
          example: 325324
        blockTimestamp:
          type: integer
          format: uint64
          description: block unix timestamp
          example: 1533267900

    LogMeta:
      description: event or transfer log meta info
      properties:
        blockID:
          type: string
          description: block identifier (bytes32)
          example: "0x0004f6cc88bb4626a92907718e82f255b8fa511453a78e8797eb8cea3393b215"
        blockNumber:
          type: integer
          format: uint32
          description: block number (height)
          example: 325324
        blockTimestamp:
          type: integer
          format: uint64
          description: block unix timestamp
          example: 1533267900
        txID:
          type: string
          description: transaction identifier
          example: "0x284bba50ef777889ff1a367ed0b38d5e5626714477c40de38d71cedd6f9fa477"
        txOrigin:
          type: string
          description: transaction origin (signer)
          example: "0xdb4027477b2a8fe4c83c6dafe7f86678bb1b8a8d"

    Block:
      properties:
        number:
          type: integer
          format: uint32
          description: block number (height)
          example: 325324
        id:
          type: string
          format: bytes32
          description: block identifier
          example: "0x0004f6cc88bb4626a92907718e82f255b8fa511453a78e8797eb8cea3393b215"
        size:
          type: integer
          format: uint32
          description: RLP encoded block size in bytes
          example: 373
        parentID:
          type: string
          format: bytes32
          description: parent block ID
          example: "0x0004f6cb730dbd90fed09d165bfdf33cc0eed47ec068938f6ee7b7c12a4ea98d"
        timestamp:
          type: integer
          format: uint64
          description: block unix timestamp
          example: 1533267900
        gasLimit:
          type: integer
          format: uint64
          description: block gas limit (max allowed accumulative gas usage of transactions)
          example: 11253579
        beneficiary:
          type: string
          format: bytes32
          description: address of account to receive block reward
          example: "0xb4094c25f86d628fdd571afc4077f0d0196afb48"
        gasUsed:
          type: integer
          format: uint64
          description: accumulative gas usage of transactions
          example: 21000
        totalScore:
          type: integer
          format: uint64
          description: sum of all ancestral blocks' score
          example: 1029988
        txsRoot:
          type: string
          format: bytes32
          description: root hash of transactions in the block
          example: "0x89dfd9fcd10c9e53d68592cf8b540b280b72d381b868523223992f3e09a806bb"
        stateRoot:
          type: string
          format: bytes32
          description: root hash of accounts state
          example: "0x86bcc6d214bc9d8d0dedba1012a63c8317d19ce97f60c8a2ef5c59bbd40d4261"
        receiptsRoot:
          type: string
          format: bytes32
          description: root hash of transaction receipts
          example: "0x15787e2533c470e8a688e6cd17a1ee12d8457778d5f82d2c109e2d6226d8e54e"
        signer:
          type: string
          format: bytes20
          description: the one who signed this block
          example: "0xab7b27fc9e7d29f9f2e5bd361747a5515d0cc2d1"
        transactions:
          type: array
          description: transactions IDs
          items:
            type: string
            format: bytes32
            description: transaction ID
            example: "0x284bba50ef777889ff1a367ed0b38d5e5626714477c40de38d71cedd6f9fa477"

    Clause:
      properties:
        to:
          type: string
          description: "recipient of clause, null for contract deployment (bytes32)"
          example: "0x5034aa590125b64023a0262112b98d72e3c8e40e"
        value:
          type: string
          description: hex form of token to be transferred
          example: "0x47fdb3c3f456c0000"
        data:
          type: string
          description: input data (bytes)
          example: "0x"

    TxBody:
      properties:
        chainTag:
          type: integer
          format: uint8
          description: last byte of genesis block ID
          example: 39
        blockRef:
          type: string
          description: 8 bytes prefix of some block ID
          example: "0x0004f6cb730dbd90"
        expiration:
          type: integer
          format: uint32
          description: "expiration relative to blockRef, in unit block"
          example: 720
        clauses:
          type: array
          items:
            $ref: "#/components/schemas/Clause"
        gasPriceCoef:
          type: integer
          format: uint8
          description: coefficient used to calculate the final gas price
          example: 0
        gas:
          type: integer
          format: uint64
          description: max amount of gas can be consumed to execute this transaction
          example: 21000
        dependsOn:
          type: string
          format: bytes32
          description: ID of the transaction on which the current transaction depends on. can be null.
          example: null
        nonce:
          type: string
          example: "0x29c257e36ea6e72a"

    SignedTx:
      allOf:
        - $ref: "#/components/schemas/TxBody"
        - type: object
          properties:
            signature:
              type: string
              description: signature hex string
              example: "0x67cd851b90fb016457bb30ccbdaa3405f3db667daeb95258e1859c545be30c10f1780476f7c6ba24c75d26c8f1a9df59fe89b105c6f86733c1d5c1c74f14cd9201"

    TxWithMeta:
      allOf:
        - $ref: "#/components/schemas/TxBody"
        - type: object
          properties:
            id:
              type: string
              description: identifier of the transaction
              example: "0x284bba50ef777889ff1a367ed0b38d5e5626714477c40de38d71cedd6f9fa477"
            origin:
              type: string
              description: the one who signed the transaction
              example: "0xdb4027477b2a8fe4c83c6dafe7f86678bb1b8a8d"
            size:
              type: integer
              format: uint32
              description: byte size of the transaction that is RLP encoded
              example: 130
            meta:
              $ref: "#/components/schemas/TxMeta"

    RawTx:
      properties:
        raw:
          type: string
          description: hex form of encoded transaction
          example: "0xf86981ba800adad994000000000000000000000000000000000000746f82271080018252088001c0b8414792c9439594098323900e6470742cd877ec9f9906bca05510e421f3b013ed221324e77ca10d3466b32b1800c72e12719b213f1d4c370305399dd27af962626400"

    RawTxWithMeta:
      properties:
        raw:
          type: string
          description: hex form of encoded transaction
          example: "0xf86981ba800adad994000000000000000000000000000000000000746f82271080018252088001c0b8414792c9439594098323900e6470742cd877ec9f9906bca05510e421f3b013ed221324e77ca10d3466b32b1800c72e12719b213f1d4c370305399dd27af962626400"
        meta:
          $ref: "#/components/schemas/TxMeta"

    Event:
      properties:
        address:
          type: string
          description: the address of contract which produces the event (bytes20)
          example: "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed"
        topics:
          type: array
          items:
            type: string
            example: "0x4de71f2d588aa8a1ea00fe8312d92966da424d9939a511fc0be81e65fad52af8"
        data:
          type: string
          example: "0x4de71f2d588aa8a1ea00fe8312d92966da424d9939a511fc0be81e65fad52af8"

    Transfer:
      properties:
        sender:
          type: string
          description: address that sends tokens
          example: "0xdb4027477b2a8fe4c83c6dafe7f86678bb1b8a8d"
        recipient:
          type: string
          description: address that receives tokens
          example: "0x5034aa590125b64023a0262112b98d72e3c8e40e"
        amount:
          type: string
          description: amount of tokens
          example: "0x47fdb3c3f456c0000"

    Receipt:
      properties:
        gasUsed:
          type: integer
          format: uint64
          example: 21000
        gasPayer:
          type: string
          description: address of account who paid used gas
          example: "0xdb4027477b2a8fe4c83c6dafe7f86678bb1b8a8d"
        paid:
          type: string
          description: hex form of amount of paid energy
          example: "0x1236efcbcbb340000"
        reward:
          type: string
          description: hex form of amount of reward
          example: "0x576e189f04f60000"
        reverted:
          type: boolean
          description: true means the transaction was reverted
          example: false
        outputs:
          type: array
          items:
            properties:
              contractAddress:
                type: string
                description: |
                  deployed contract address, if the corresponding clause is a
                  contract deployment clause
                example: null
              events:
                type: array
                items:
                  $ref: "#/components/schemas/Event"
              transfers:
                type: array
                items:
                  $ref: "#/components/schemas/Transfer"
        meta:
          $ref: "#/components/schemas/LogMeta"

    CallData:
      properties:
        value:
          type: string
          description: amount of token to be transferred
        data:
          type: string
          description: input data for contract call
        gas:
          type: integer
          format: uint64
          description: max allowed gas for execution
        gasPrice:
          type: string
          description: absolute gas price
        caller:
          type: string
          description: caller address (msg.sender)
      example:
        value: "0xde0b6b3a7640000"
        data: "0x5665436861696e2054686f72"

    CallResult:
      properties:
        data:
          type: string
          description: the output data
          example: "0x103556a73c10e38ffe2fc4aa50fc9d46ad0148f07e26417e117bd1ece9d948b5"
        events:
          type: array
          items:
            $ref: "#/components/schemas/Event"
        transfers:
          type: array
          items:
            $ref: "#/components/schemas/Transfer"
        gasUsed:
          type: integer
          format: uint64
          description: gas used during execution
          example: 21000
        reverted:
          type: boolean
          example: false
        vmError:
          type: string
          example: ""

    BatchCallData:
      properties:
        clauses:
          type: array
          items:
            $ref: "#/components/schemas/Clause"
        gas:
          type: integer
          format: uint64
          description: max allowed gas for execution
        gasPrice:
          type: string
          description: absolute gas price
        caller:
          type: string
          description: caller address (msg.sender)
      example:
        clauses:
          - to: "0x5034aa590125b64023a0262112b98d72e3c8e40e"
            value: "0xde0b6b3a7640000"
            data: "0x5665436861696e2054686f72"

    BatchCallResult:
      type: array
      items:
        $ref: "#/components/schemas/CallResult"

    FilterOptions:
      properties:
        offset:
          type: integer
          example: 0
          description: |
            offset in matched record set
        limit:
          type: integer
          example: 10
          description: |
            limit of records to output
      description: |
        pass these parameters if you need filtered results paged. e.g. 
        ```
        {
          "options": {
            "offset": 0,
            "limit": 10   
          }
        }
        ```
        the above refers that page offset is 0, and the page size is 10.
        pass options `null` if you don't need to demand paging.

    FilterRange:
      properties:
        unit:
          type: string
          enum:
            - block
            - time

          example: block
          description: |
            defines the unit of `from` and `to`.
            `block` means block number, `time` means block timestamp, default to `block`.

        from:
          type: integer
          format: uint64
          example: 0

        to:
          type: integer
          format: uint64
          example: 100000

      description: |
        defines the range to filter in. e.g.
        ```
        {
          "range": {
            "unit": "block",
            "from": 10,
            "to": 1000
          }
        }
        ```
        refers to the range from block 10 to block 1000.
        `null` stands for the full range.

    TopicSetLegacy:
      properties:
        topic0:
          type: string
        topic1:
          type: string
        topic2:
          type: string
        topic3:
          type: string
        topic4:
          type: string
      description: |
        a set of topics joined with `and` operator. `null` topics a

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