⚛️ Tendermint2 Indexer ⚛️

• Overview
• Key Features
• Getting Started
• GraphQL Endpoint
  • Examples
    • Get all Transactions with add_package messages. Show the creator, package name and path.
    • Subscribe to get all new blocks in real-time
• RPC Endpoints
  • Block Endpoints
    • getBlock
  • Transaction Endpoints
    • getTxResult
  • Filter Endpoints
    • newBlockFilter
    • getFilterChanges
    • uninstallFilter
    • subscribe
    • unsubscribe

Overview

tx-indexer is a tool designed to index TM2 chain data and serve it over RPC, facilitating efficient data retrieval and management in Tendermint2 networks.

Key Features

• JSON-RPC 2.0 Specification Server: Utilizes the JSON-RPC 2.0 standard for request / response handling.
• HTTP and WS Support: Handles both HTTP POST requests and WebSocket connections.
• 2-Way WS Communication: Subscribe and receive data updates asynchronously over WebSocket connections.
• Concurrent Chain Indexing: Utilizes asynchronous workers for fast and efficient indexing. Data is available for serving as soon as it is fetched from the remote chain.
• Embedded Database: Features PebbleDB for quick on-disk data access and migration.

Getting Started

This section guides you through setting up and running the tx-indexer.

1. Clone the Repository

git clone https://github.com/gnolang/tx-indexer.git

2. Build the binary

cd tx-indexer
make build

3. Run the indexer

./build/tx-indexer start --remote https://rpc.test4.gno.land --db-path indexer-db

or:

go run cmd/main.go cmd/start.go cmd/waiter.go start --remote https://rpc.test4.gno.land --db-path indexer-db

The --remote flag specifies the JSON-RPC URL of the chain the indexer should index, and the --db-path specifies the on-disk location for the indexed data.

Note: the websocket endpoint exposed is always: ws://<listen-address>/ws

For a full list of available features and flags, execute the --help command:

> ./build/tx-indexer start --help

DESCRIPTION
  Starts the indexer service

USAGE
  start [flags]

Starts the indexer service, which includes the fetcher and JSON-RPC server

FLAGS
  -db-path indexer-db             the absolute path for the indexer DB (embedded)
  -http-rate-limit 0              the maximum HTTP requests allowed per minute per IP, unlimited by default
  -listen-address 0.0.0.0:8546    the IP:PORT URL for the indexer JSON-RPC server
  -log-level info                 the log level for the CLI output
  -max-chunk-size 100             the range for fetching blockchain data by a single worker
  -max-slots 100                  the amount of slots (workers) the fetcher employs
  -remote http://127.0.0.1:26657  the JSON-RPC URL of the Gno chain

GraphQL Endpoint

A GraphQL endpoint is available at /graphql/query. It supports standard queries for transactions and blocks and subscriptions for real-time events.

A GraphQL playground is available at /graphql. There you have all the documentation needed explaining the different fields and available filters.

Examples

Get all Transactions with add_package messages. Show the creator, package name and path.

{
  transactions(
    filter: { message: {vm_param: {add_package: {}}}}
  ) {
    index
    hash
    block_height
    gas_used
    messages {
      route
      typeUrl
      value {
        __typename
        ... on MsgAddPackage {
          creator
          package {
            name
            path
          }
        }
      }
    }
  }
}

Subscribe to get all new blocks in real-time

subscription {
  blocks(filter: {}) {
    height
    version
    chain_id
    time
    proposer_address_raw
  }
}

RPC Endpoints

Please take note that the indexer JSON-RPC server adheres to the JSON-RPC 2.0 standard for request and response processing.

Block Endpoints

getBlock

Fetches a specific block from the chain.

• Params: Decimal block number (int64) as a string.
• Response: Base64 encoded, Amino encoded binary of the block.

Example request:

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "getBlock",
  "params": [
    "10"
  ]
}

Example response:

{
  "result": "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",
  "jsonrpc": "2.0",
  "id": 1
}

If no block is found (not yet indexed), null as the response result is returned:

{
  "result": null,
  "jsonrpc": "2.0",
  "id": 1
}

Transaction Endpoints

getTxResult

Fetches the specified transaction result from storage.

• Params: Base64 hash of the transaction
• Response: Base64 encoded, Amino encoded binary of the transaction result

Example request:

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "getTxResult",
  "params": [
    "AP9YX+QXrIByqonIqStod8G9EI5AMiUZhsXk58wr0ws="
  ]
}

Example response:

{
  "result": "CIjaGRqVEwrfEQoML3ZtLm1fYWRkcGtnEs4RCihnMTludmNrZ2QzY2trZmp6cDUyczc0Z2N4czA5dHduczc1amVucXk1EqERCgdjYXB0YWluEhdnbm8ubGFuZC9yL2RlbW8vY2FwdGFpbhr8EAoJR1JDMjAuZ25vEu4QcGFja2FnZSBjYXB0YWluDQoNCmltcG9ydCAoDQoJInN0ZCINCgkic3RyaW5ncyINCg0KCSJnbm8ubGFuZC9wL2RlbW8vZ3JjL2dyYzIwIg0KCSJnbm8ubGFuZC9wL2RlbW8vdWZtdCINCgkiZ25vLmxhbmQvci9kZW1vL3VzZXJzIg0KKQ0KDQp2YXIgKA0KCWNhcHRhaW4gICpncmMyMC5BZG1pblRva2VuDQoJYWRtaW4gc3RkLkFkZHJlc3MgPSAiZzE5bnZja2dkM2Nra2ZqenA1MnM3NGdjeHMwOXR3bnM3NWplbnF5NSINCikNCg0KZnVuYyBpbml0KCkgew0KCWNhcHRhaW4gPSBncmMyMC5OZXdBZG1pblRva2VuKCJDUE4iLCAiY2FwdGFpbiIsIDYpDQoJY2FwdGFpbi5NaW50KGFkbWluLCA2OTAwMDAwMDAwMCkgLy8gQGFkbWluaXN0cmF0b3INCn0NCg0KLy8gbWV0aG9kIHByb3hpZXMgYXMgcHVibGljIGZ1bmN0aW9ucy4NCi8vDQoNCi8vIGdldHRlcnMuDQoNCmZ1bmMgVG90YWxTdXBwbHkoKSB1aW50NjQgew0KCXJldHVybiBjYXB0YWluLlRvdGFsU3VwcGx5KCkNCn0NCg0KZnVuYyBCYWxhbmNlT2Yob3duZXIgdXNlcnMuQWRkcmVzc09yTmFtZSkgdWludDY0IHsNCgliYWxhbmNlLCBlcnIgOj0gY2FwdGFpbi5CYWxhbmNlT2Yob3duZXIuUmVzb2x2ZSgpKQ0KCWlmIGVyciAhPSBuaWwgew0KCQlwYW5pYyhlcnIpDQoJfQ0KCXJldHVybiBiYWxhbmNlDQp9DQoNCmZ1bmMgQWxsb3dhbmNlKG93bmVyLCBzcGVuZGVyIHVzZXJzLkFkZHJlc3NPck5hbWUpIHVpbnQ2NCB7DQoJYWxsb3dhbmNlLCBlcnIgOj0gY2FwdGFpbi5BbGxvd2FuY2Uob3duZXIuUmVzb2x2ZSgpLCBzcGVuZGVyLlJlc29sdmUoKSkNCglpZiBlcnIgIT0gbmlsIHsNCgkJcGFuaWMoZXJyKQ0KCX0NCglyZXR1cm4gYWxsb3dhbmNlDQp9DQoNCi8vIHNldHRlcnMuDQoNCmZ1bmMgVHJhbnNmZXIodG8gdXNlcnMuQWRkcmVzc09yTmFtZSwgYW1vdW50IHVpbnQ2NCkgew0KCWNhbGxlciA6PSBzdGQuR2V0T3JpZ0NhbGxlcigpDQoJY2FwdGFpbi5UcmFuc2ZlcihjYWxsZXIsIHRvLlJlc29sdmUoKSwgYW1vdW50KQ0KfQ0KDQpmdW5jIEFwcHJvdmUoc3BlbmRlciB1c2Vycy5BZGRyZXNzT3JOYW1lLCBhbW91bnQgdWludDY0KSB7DQoJY2FsbGVyIDo9IHN0ZC5HZXRPcmlnQ2FsbGVyKCkNCgljYXB0YWluLkFwcHJvdmUoY2FsbGVyLCBzcGVuZGVyLlJlc29sdmUoKSwgYW1vdW50KQ0KfQ0KDQpmdW5jIFRyYW5zZmVyRnJvbShmcm9tLCB0byB1c2Vycy5BZGRyZXNzT3JOYW1lLCBhbW91bnQgdWludDY0KSB7DQoJY2FsbGVyIDo9IHN0ZC5HZXRPcmlnQ2FsbGVyKCkNCgljYXB0YWluLlRyYW5zZmVyRnJvbShjYWxsZXIsIGZyb20uUmVzb2x2ZSgpLCB0by5SZXNvbHZlKCksIGFtb3VudCkNCn0NCg0KLy8gYWRtaW5pc3RyYXRpb24uDQoNCmZ1bmMgTWludChhZGRyZXNzIHVzZXJzLkFkZHJlc3NPck5hbWUsIGFtb3VudCB1aW50NjQpIHsNCgljYWxsZXIgOj0gc3RkLkdldE9yaWdDYWxsZXIoKQ0KCWFzc2VydElzQWRtaW4oY2FsbGVyKQ0KCWNhcHRhaW4uTWludChhZGRyZXNzLlJlc29sdmUoKSwgYW1vdW50KQ0KfQ0KDQpmdW5jIEJ1cm4oYWRkcmVzcyB1c2Vycy5BZGRyZXNzT3JOYW1lLCBhbW91bnQgdWludDY0KSB7DQoJY2FsbGVyIDo9IHN0ZC5HZXRPcmlnQ2FsbGVyKCkNCglhc3NlcnRJc0FkbWluKGNhbGxlcikNCgljYXB0YWluLkJ1cm4oYWRkcmVzcy5SZXNvbHZlKCksIGFtb3VudCkNCn0NCg0KLy8gcmVuZGVyLg0KLy8NCg0KZnVuYyBSZW5kZXIocGF0aCBzdHJpbmcpIHN0cmluZyB7DQoJcGFydHMgOj0gc3RyaW5ncy5TcGxpdChwYXRoLCAiLyIpDQoJYyA6PSBsZW4ocGFydHMpDQoNCglzd2l0Y2ggew0KCWNhc2UgcGF0aCA9PSAiIjoNCgkJcmV0dXJuIGNhcHRhaW4uUmVuZGVySG9tZSgpDQoJY2FzZSBjID09IDIgJiYgcGFydHNbMF0gPT0gImJhbGFuY2UiOg0KCQlvd25lciA6PSB1c2Vycy5BZGRyZXNzT3JOYW1lKHBhcnRzWzFdKQ0KCQliYWxhbmNlLCBfIDo9IGNhcHRhaW4uQmFsYW5jZU9mKG93bmVyLlJlc29sdmUoKSkNCgkJcmV0dXJuIHVmbXQuU3ByaW50ZigiJWRcbiIsIGJhbGFuY2UpDQoJZGVmYXVsdDoNCgkJcmV0dXJuICI0MDRcbiINCgl9DQp9DQoNCmZ1bmMgYXNzZXJ0SXNBZG1pbihhZGRyZXNzIHN0ZC5BZGRyZXNzKSB7DQoJaWYgYWRkcmVzcyAhPSBhZG1pbiB7DQoJCXBhbmljKCJyZXN0cmljdGVkIGFjY2VzcyIpDQoJfQ0KfRIRCIDaxAkSCjUwMDAwdWdub3Qafgo6ChMvdG0uUHViS2V5U2VjcDI1NmsxEiMKIQKN1aylL3JWIoeyByEGcAo2LPJv6HVMI+vneCMVg3YUjRJAfVXpl28frJh0hcJQSO6Vrbpx339p+hf9nuaMx44/Sa984DsstdGuIfZbBo9osUnfSocCw/i84rEsIzGnQ9Hb6SIeRGVwbG95ZWQgdGhyb3VnaCBwbGF5Lmduby5sYW5kIp4dCpIdChQKEi9zdGQuSW50ZXJuYWxFcnJvciL5HHJlY292ZXJlZDogcGFja2FnZSBhbHJlYWR5IGV4aXN0czogZ25vLmxhbmQvci9kZW1vL2NhcHRhaW4Kc3RhY2s6Cmdvcm91dGluZSA2MCBbcnVubmluZ106CnJ1bnRpbWUvZGVidWcuU3RhY2soKQoJL3Vzci9sb2NhbC9nby9zcmMvcnVudGltZS9kZWJ1Zy9zdGFjay5nbzoyNCArMHg2NQpnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3Mvc2RrLigqQmFzZUFwcCkucnVuVHguZnVuYzEoKQoJL29wdC9idWlsZC9wa2dzL3Nkay9iYXNlYXBwLmdvOjc0MyArMHgyY2QKcGFuaWMoezB4YmU1NmMwLCAweGMwMGZjMWRkMDB9KQoJL3Vzci9sb2NhbC9nby9zcmMvcnVudGltZS9wYW5pYy5nbzo4ODQgKzB4MjEyCmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9zZGsvdm0uKCpWTUtlZXBlcikuQWRkUGFja2FnZShfLCB7ezB4ZjYyMTQwLCAweGMwMDk5YmUyNzB9LCAweDIsIHsweGY2MWIwOCwgMHhjMDBmYzFjOWYwfSwgezB4ZjYyMmM4LCAweGMwMDU2YTQ0MjB9LCB7MHhjMDI0YTljOTgwLCAweDV9LCAuLi59LCAuLi4pCgkvb3B0L2J1aWxkL3BrZ3Mvc2RrL3ZtL2tlZXBlci5nbzoxMzggKzB4Njg1CmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9zZGsvdm0udm1IYW5kbGVyLmhhbmRsZU1zZ0FkZFBhY2thZ2Uoe199LCB7ezB4ZjYyMTQwLCAweGMwMDk5YmUyNzB9LCAweDIsIHsweGY2MWIwOCwgMHhjMDBmYzFjOWYwfSwgezB4ZjYyMmM4LCAweGMwMDU2YTQ0MjB9LCB7MHhjMDI0YTljOTgwLCAweDV9LCAuLi59LCAuLi4pCgkvb3B0L2J1aWxkL3BrZ3Mvc2RrL3ZtL2hhbmRsZXIuZ286NDYgKzB4MmM1CmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9zZGsvdm0udm1IYW5kbGVyLlByb2Nlc3Moe199LCB7ezB4ZjYyMTQwLCAweGMwMDk5YmUyNzB9LCAweDIsIHsweGY2MWIwOCwgMHhjMDBmYzFjOWYwfSwgezB4ZjYyMmM4LCAweGMwMDU2YTQ0MjB9LCB7MHhjMDI0YTljOTgwLCAweDV9LCAuLi59LCAuLi4pCgkvb3B0L2J1aWxkL3BrZ3Mvc2RrL3ZtL2hhbmRsZXIuZ286MjcgKzB4MjI1CmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9zZGsuKCpCYXNlQXBwKS5ydW5Nc2dzKF8sIHt7MHhmNjIxNDAsIDB4YzAwOTliZTI3MH0sIDB4MiwgezB4ZjYxYjA4LCAweGMwMGZjMWM5ZjB9LCB7MHhmNjIyYzgsIDB4YzAwNTZhNDQyMH0sIHsweGMwMjRhOWM5ODAsIDB4NX0sIC4uLn0sIC4uLikKCS9vcHQvYnVpbGQvcGtncy9zZGsvYmFzZWFwcC5nbzo2NDQgKzB4NDJmCmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9zZGsuKCpCYXNlQXBwKS5ydW5UeCgweGMwMDAxYTQyMDAsIDB4MiwgezB4YzAwNDNkYjUwMCwgMHg5OTUsIF99LCB7ezB4YzAxMzBhOWM0MCwgMHgxLCAweDF9LCB7MHg5ODk2ODAsIHt7MHhjMDBlZjJjNjg1LCAuLi59LCAuLi59fSwgLi4ufSkKCS9vcHQvYnVpbGQvcGtncy9zZGsvYmFzZWFwcC5nbzo4MjMgKzB4OTA1CmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9zZGsuKCpCYXNlQXBwKS5EZWxpdmVyVHgoMHgwPywge3t9LCB7MHhjMDA0M2RiNTAwPywgMHgwPywgMHgwP319KQoJL29wdC9idWlsZC9wa2dzL3Nkay9iYXNlYXBwLmdvOjU4MCArMHgxN2QKZ2l0aHViLmNvbS9nbm9sYW5nL2duby9wa2dzL2JmdC9hYmNpL2NsaWVudC4oKmxvY2FsQ2xpZW50KS5EZWxpdmVyVHhBc3luYygweGMwMTNiNzY1NDAsIHt7fSwgezB4YzAwNDNkYjUwMD8sIDB4MD8sIDB4MD99fSkKCS9vcHQvYnVpbGQvcGtncy9iZnQvYWJjaS9jbGllbnQvbG9jYWxfY2xpZW50LmdvOjgyICsweDEwMwpnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L3Byb3h5LigqYXBwQ29ubkNvbnNlbnN1cykuRGVsaXZlclR4QXN5bmMoMHgwPywge3t9LCB7MHhjMDA0M2RiNTAwPywgMHgwPywgMHgwP319KQoJL29wdC9idWlsZC9wa2dzL2JmdC9wcm94eS9hcHBfY29ubi5nbzo3MyArMHgyNgpnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L3N0YXRlLmV4ZWNCbG9ja09uUHJveHlBcHAoezB4ZjYzMGEwLCAweGMwMTNiN2MwZjB9LCB7MHhmNjU1NzAsIDB4YzAxM2I2MzZmMH0sIDB4YzAwZjY3NTZjMCwgezB4ZjZhYWYwLCAweGMwMDAxMTliNDB9KQoJL29wdC9idWlsZC9wa2dzL2JmdC9zdGF0ZS9leGVjdXRpb24uZ286MjUzICsweDhkYQpnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L3N0YXRlLigqQmxvY2tFeGVjdXRvcikuQXBwbHlCbG9jayhfLCB7ezB4Y2Y0ZGQwLCAweGJ9LCB7MHhjZjRkZDAsIDB4Yn0sIHsweDAsIDB4MH0sIHsweGMwMTNiNGZhZjAsIDB4NX0sIDB4MzM2ODMsIC4uLn0sIC4uLikKCS9vcHQvYnVpbGQvcGtncy9iZnQvc3RhdGUvZXhlY3V0aW9uLmdvOjEwMiArMHgxMTUKZ2l0aHViLmNvbS9nbm9sYW5nL2duby9wa2dzL2JmdC9jb25zZW5zdXMuKCpDb25zZW5zdXNTdGF0ZSkuZmluYWxpemVDb21taXQoMHhjMDA3Y2M0YzAwLCAweDMzNjg0KQoJL29wdC9idWlsZC9wa2dzL2JmdC9jb25zZW5zdXMvc3RhdGUuZ286MTM0OCArMHg5N2UKZ2l0aHViLmNvbS9nbm9sYW5nL2duby9wa2dzL2JmdC9jb25zZW5zdXMuKCpDb25zZW5zdXNTdGF0ZSkudHJ5RmluYWxpemVDb21taXQoMHhjMDA3Y2M0YzAwLCAweDMzNjg0KQoJL29wdC9idWlsZC9wa2dzL2JmdC9jb25zZW5zdXMvc3RhdGUuZ286MTI3NiArMHgzMTMKZ2l0aHViLmNvbS9nbm9sYW5nL2duby9wa2dzL2JmdC9jb25zZW5zdXMuKCpDb25zZW5zdXNTdGF0ZSkuZW50ZXJDb21taXQuZnVuYzEoKQoJL29wdC9idWlsZC9wa2dzL2JmdC9jb25zZW5zdXMvc3RhdGUuZ286MTIyMiArMHg5NwpnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L2NvbnNlbnN1cy4oKkNvbnNlbnN1c1N0YXRlKS5lbnRlckNvbW1pdCgweGMwMDdjYzRjMDAsIDB4MzM2ODQsIDB4MCkKCS9vcHQvYnVpbGQvcGtncy9iZnQvY29uc2Vuc3VzL3N0YXRlLmdvOjEyNTMgKzB4YjAzCmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9iZnQvY29uc2Vuc3VzLigqQ29uc2Vuc3VzU3RhdGUpLmFkZFZvdGUoMHhjMDA3Y2M0YzAwLCAweGMwMDlhNDgyODAsIHsweDAsIDB4MH0pCgkvb3B0L2J1aWxkL3BrZ3MvYmZ0L2NvbnNlbnN1cy9zdGF0ZS5nbzoxNjQxICsweDkxMwpnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L2NvbnNlbnN1cy4oKkNvbnNlbnN1c1N0YXRlKS50cnlBZGRWb3RlKDB4YzAwN2NjNGMwMCwgMHg0YjQ0MjY/LCB7MHgwPywgMHhjMDBiODE3YmYwP30pCgkvb3B0L2J1aWxkL3BrZ3MvYmZ0L2NvbnNlbnN1cy9zdGF0ZS5nbzoxNDg0ICsweDI3CmdpdGh1Yi5jb20vZ25vbGFuZy9nbm8vcGtncy9iZnQvY29uc2Vuc3VzLigqQ29uc2Vuc3VzU3RhdGUpLmhhbmRsZU1zZygweGMwMDdjYzRjMDAsIHt7MHhmNWJhYTA/LCAweGMwMWM0OWZiZDg/fSwgezB4MD8sIDB4ZWRkMzI1ZTU2P319KQoJL29wdC9idWlsZC9wa2dzL2JmdC9jb25zZW5zdXMvc3RhdGUuZ286NjkxICsweDNhOApnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L2NvbnNlbnN1cy4oKkNvbnNlbnN1c1N0YXRlKS5yZWNlaXZlUm91dGluZSgweGMwMDdjYzRjMDAsIDB4MCkKCS9vcHQvYnVpbGQvcGtncy9iZnQvY29uc2Vuc3VzL3N0YXRlLmdvOjY1MCArMHg0NTcKY3JlYXRlZCBieSBnaXRodWIuY29tL2dub2xhbmcvZ25vL3BrZ3MvYmZ0L2NvbnNlbnN1cy4oKkNvbnNlbnN1c1N0YXRlKS5PblN0YXJ0Cgkvb3B0L2J1aWxkL3BrZ3MvYmZ0L2NvbnNlbnN1cy9zdGF0ZS5nbzozNDQgKzB4NGRjChCA2sQJGIq9Cw==",
  "jsonrpc": "2.0",
  "id": 1
}

If no transaction result is found (not yet indexed, or transaction not committed yet), null as the response result is returned:

{
  "result": null,
  "jsonrpc": "2.0",
  "id": 1
}

Filter Endpoints

newBlockFilter

Creates a filter for new block events, to notify when a new block arrives. To check if the state has changed, call the getFilterChanges endpoint.

• Params: no params
• Response: the filter ID (string)

Example request:

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "newBlockFilter",
  "params": []
}

Example response:

{
  "result": "c77000bb-700c-41b9-830c-e8b35bdef246",
  "jsonrpc": "2.0",
  "id": 1
}

getFilterChanges

Polling method for a filter, which returns an array of events that have occurred since the last poll. Filters that are inactive (not polled) for 5min are automatically cleaned up.

• Params: the filter ID (string)
• Response: array containing filter data.
  • In case of a block filter, the response is an array of base64 encoded, Amino binary block headers

Example request:

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "getFilterChanges",
  "params": [
    "c77000bb-700c-41b9-830c-e8b35bdef246"
  ]
}

Example response:

{
  "result": [
    "Cgt2MS4wLjAtcmMuMBIFdGVzdDMYstoZIgsI9teBrQYQ4f+cJzDgH0JICiCOeRC+O7eSKWElYfr3roazF9A23Wvk2AvSWfhU1If41BIkCAISIOmJytoey1P0ZF1/oZUs7Pa7ytV5WJrh41s2PxvWHc4mSiDU0XJ+JFOgK7vm2fVLL29BtwKOGfkv+JxHB1sdgeoSwVog92nrytGOQMQp15Sdl3MG3GaeGdyRMAnaA1rGBVil/QhiIPdp68rRjkDEKdeUnZdzBtxmnhnckTAJ2gNaxgVYpf0IaiC4qGdcWYZSTGBBIl/XuiBtgs1cOjdQQ/BC/N12jhWS7HIggbuwi7zCzwlQP7PCb9EXN2EG7738FHbXIgYPWxBlakiCAShnMXd5cmU0Z3I3bjgyZXpmcGRoZzNueHlwank5Y2FnOXFwa3U1eDZt",
    "Cgt2MS4wLjAtcmMuMBIFdGVzdDMYtNoZIgsIs9iBrQYQ7cjnLDDgH0JICiC9pNnvamowMWsgZczqQ6V5J0YoHNYZWCwFvSFV88+j3xIkCAISIATruI4Rl6mfRoS6GzjaE0aCpWZaYNssV1E+8xRlrDStSiAwCZMWNPsjNM/2fOv37CTjuTPqKW71C5xuBnhEVO5a5Fog92nrytGOQMQp15Sdl3MG3GaeGdyRMAnaA1rGBVil/QhiIPdp68rRjkDEKdeUnZdzBtxmnhnckTAJ2gNaxgVYpf0IaiC4qGdcWYZSTGBBIl/XuiBtgs1cOjdQQ/BC/N12jhWS7HIggbuwi7zCzwlQP7PCb9EXN2EG7738FHbXIgYPWxBlakiCAShnMXd5cmU0Z3I3bjgyZXpmcGRoZzNueHlwank5Y2FnOXFwa3U1eDZt"
  ],
  "jsonrpc": "2.0",
  "id": 1
}

uninstallFilter

Uninstalls a filter with the given filter ID.

• Params: the filter ID (string)
• Response: true if the filter was successfully uninstalled, otherwise false (boolean)

Example request:

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "uninstallFilter",
  "params": [
    "c77000bb-700c-41b9-830c-e8b35bdef246"
  ]
}

Example response:

{
  "result": true,
  "jsonrpc": "2.0",
  "id": 1
}

subscribe

Starts a subscription to a specific event. Only available over WS connections.

Available events:

• newHeads - fires a notification each time a new header is appended to the chain

• Params: the event type [newHeads] (string)

• Response: the subscription ID (string) (initial response), then event data (see example below)

  • For newHeads events, the result is a base64 encoded, Amino binary block header

Since this endpoint is only supported over WS connections, it will write data directly to the client.

Example request (over WS):

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "subscribe",
  "params": [
    "newHeads"
  ]
}

Example initial response (over WS):

{
  "result": "b8934e81-5758-4249-8953-da90aa777ef9",
  "jsonrpc": "2.0",
  "id": 1
}

Example response when a newHeads event happens (over WS):

{
  "params": {
    "result": "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",
    "subscription": "b8934e81-5758-4249-8953-da90aa777ef9"
  },
  "jsonrpc": "2.0",
  "method": "subscription"
}

unsubscribe

Cancels an existing subscription so that no further events are sent. Only available over WS connections.

• Params: the subscription ID (string)
• Response: A boolean value indicating if the subscription was canceled successfully (boolean)

Example request (over WS):

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "unsubscribe",
  "params": [
    "b8934e81-5758-4249-8953-da90aa777ef9"
  ]
}

Example response (over WS):

{
  "result": true,
  "jsonrpc": "2.0",
  "id": 1
}