GraphQL API

GraphQL on Tetreum Testnet

What is GraphQL

GraphQL is a query language for APIs that allows clients to request exactly the data they need. It provides a flexible and efficient way to access blockchain data without over-fetching unnecessary fields.

Key concepts of GraphQL:

• Hierarchical

• Strongly typed

• Client-specified queries

Advantages of GraphQL:

• Declarative data fetching

• Flexible response structure

• Efficient client integration

• Easier exploration of blockchain data

Query Types

There are three main GraphQL operation types:

1

Query

Used to fetch data.

query {
  block(number: 1) {
    hash
    number
  }
}

2

Mutation

Used to change data.

mutation {
  exampleMutation(id: 1) {
    id
  }
}

3

Subscription

Used to subscribe to real-time updates.

subscription {
  newTransaction {
    hash
    blockNumber
  }
}

Access GraphQL API

You can access the Tetreum Testnet GraphQL API from the explorer interface or by using your preferred HTTP client.

GraphQL Endpoint

https://testnet.tetscan.com/api/v2/graphql

Explorer

https://testnet.tetscan.com/

You can test queries from the explorer's API section if GraphQL is enabled on the instance.

You can also use curl:

curl 'https://testnet.tetscan.com/api/v2/graphql' \
  -H 'Content-Type: application/json' \
  -d '{"query":"{ block(number: 1) { hash number } }"}'

Queries

The Tetreum Testnet GraphQL API can be used to query blockchain data such as addresses, blocks, and transactions.

Common Queries

Query	Description	Example
address(hash: AddressHash!)	Get an address by hash	{ address(hash: "0x...") { hash } }
addresses(hashes: [AddressHash!])	Get multiple addresses by hash	{ addresses(hashes: ["0x...", "0x..."]) { hash } }
block(number: Int!)	Get a block by number	{ block(number: 1) { hash number } }
transaction(hash: FullHash!)	Get a transaction by hash	{ transaction(hash: "0x...") { hash gasUsed } }

Example Query

Example query to retrieve transactions for a specific address:

{
  address(hash: "0x...") {
    transactions(first: 5) {
      edges {
        node {
          blockNumber
          createdContractAddressHash
          fromAddressHash
          gas
          hash
        }
      }
    }
  }
}

Transaction lists may support pagination arguments such as:

• first

• after

• before

Notes

• GraphQL availability depends on the explorer configuration

• Tetreum Testnet is a Geth-based PoA network

• The GraphQL API is intended for development, analytics, and explorer-based queries

• For standard wallet and dApp interactions, use the JSON-RPC endpoint

Related Endpoints

RPC URL

https://testrpc.tetreum.com

Chain ID

793788

Currency Symbol

TET