GraphQL

Unionlabs provides a hosted indexing service for all connected chains, served at graphql.union.build. A GraphiQL Playground is also provided, which can be used to explore all available data. This guide goes through the most useful queries and types.

Although most HTTP clients can be used to query our API, we recommend URQL. Our GraphQL schema can be downloaded using graphqurl or graphql-inspector:

# download .graphql schema
npx @graphql-inspector/cli \
  introspect https://graphql.union.build/v1/graphql \
  --write schema.graphql

# download .json schema
npx @graphql-inspector/cli \
  introspect https://graphql.union.build/v1/graphql \
  --write schema.json

# download .graphql schema
npx graphqurl https://graphql.union.build/v1/graphql \
  --introspect > schema.graphql

# download .json schema
npx graphqurl https://graphql.union.build/v1/graphql \
  --introspect \
  --format json > schema.json

curl --silent --location \
    --request POST \
    --url 'https://graphql.union.build/v1/graphql' \
    --header 'Content-Type: application/json' \
    --data '{"query":"query IntrospectionQuery { __schema { description queryType { name description } mutationType { name description } subscriptionType { name description } types { ...FullType } directives { name description locations args { ...InputValue } } } } fragment FullType on __Type { kind name description fields(includeDeprecated: true) { name description args { ...InputValue } type { ...TypeRef } isDeprecated deprecationReason } inputFields { ...InputValue } interfaces { ...TypeRef } enumValues(includeDeprecated: true) { name description isDeprecated deprecationReason } possibleTypes { ...TypeRef } } fragment InputValue on __InputValue { name description type { ...TypeRef } defaultValue } fragment TypeRef on __Type { kind name description ofType { kind name description ofType { kind name description ofType { kind name description ofType { kind name description ofType { kind name description ofType { kind name description ofType { kind name description } } } } } } } }","variables":{}}' \
    | jq '.data' > schema.json

This schema can be used by API clients and editors like VSCode to provide a better developer experience.

Concepts

The following definitions are used across the schema and documentation:

source: The chain or rollup where the packet is sent from, often prefixed such as source_timestamp or source_transaction_hash.
destination: The chain or roll-up that receives the packet.
sender: the contract or EOA that made the transfer.
receiver: the contract or EOA that received the transfer.

Queries

Below we have documented some common useful queries that are also leveraged in app.union.build. For all queries, Union provides caches to increase performance. Use the syntax @cached(ttl: ${time_in_seconds}) to cache the query. The cache key, which is used to map the query to the response, is computed by hashing:

the GraphQL query.
the GraphQL operation name.
the GraphQL variables of the query.

Caching can dramatically improve performance. Always add at least @cached(ttl: 1) to cache data between different windows, tabs, or users.

Transfers

Transfers facilitated by Union (either ucs01-relay-1 or ics20-1) are queryable using v1_transfers.

query GetLatest10Transfers @cached(ttl: 1) {
  v1_transfers(
    limit: 10,
    order_by: { source_timestamp: desc }
  ) {
    tokens {
      denom
      amount
    }
    sender
    receiver
  }
}

It provides information on the sender, receiver, current stage of the transfer, and asset metadata.

To query for specific addresses, add the sender and receiver to the where clause:

query GetAllUserTransfers @cached(ttl: 1) {
  v1_transfers(
    order_by: { source_timestamp: desc },
    where: {
      _or: [
        { sender: { _eq: "union1sw44hacrewvkuvm70zfxhwa9u6vm4f8yc8spqu" }},
        { receiver: { _eq: "union1sw44hacrewvkuvm70zfxhwa9u6vm4f8yc8spqu" }}
      ]
    }
  ) {
    tokens {
      denom
      amount
    }
    receiver
    sender
    source_chain { display_name }
    destination_chain { display_name }
  }
}

Aggregate statistics about all transfers and packets are also available, such as the total amount of transfers and packets:

query {
   v1_statistics {
    name
    value
  }
}

Packets

Packets, used in general message passing, can be tracked using v1_packets, similar to v1_transfers.

query GetLatest10Packets @cached(ttl: 1) {
  v1_packets(
    limit: 10,
    order_by: { source_timestamp: desc }
  ) {
    source_chain { display_name }
    destination_chain { display_name }
    source_packet_data
    source_sequence
    destination_sequence
  }
}

Traces

Both transfers and packets come with traces to track the progress of the message. There are four different trace types:

SEND_PACKET
LIGHTCLIENT_UPDATE
RECEIVE_PACKET
ACKNOWLEDGE_PACKET

For a specific transaction hash, you can obtain all traces of transfers and packets caused by this transaction (the initiating_transaction_hash) by querying

query GetTracesByHash @cached(ttl: 1) {
  v1_traces(
    where: {
      initiating_transaction_hash: {
        _eq: "91C934788FD13D5325F5A1D9CF1634D1861E318D6DDD2C141E91CBE8A68A053D"
      }
    }
  ) {
    type
    data
    transaction_hash
    chain { display_name }
  }
}

The v1_traces.data field is dependent on the type and may contain chain-specific information as well. The v1_transfers and v1_packets also have a relation to traces, to allow for all info of a specific transfer or packet.

query GetLatest10TransfersWithTraces @cached(ttl: 1) {
  v1_transfers(
    limit: 10,
    order_by: {
      source_timestamp: desc
    }
  ) {
    tokens {
      denom
      amount
    }
    receiver
    sender
    traces {
      type
      data
      transaction_hash
      chain { display_name }
    }
  }
}

Assets

Unionlabs provides a curated registry of different assets across different chains, including the bridged asset info for Union’s assets.

query GetAllSupportedAssets @cached(ttl: 1) {
  v1_assets {
    chain {
      display_name
    }
    denom
    decimals
    display_name
    display_symbol
    logo_uri
  }
}

The assets can also be grouped and filtered by specific chains.

query GetAllSupportedAssetsByChain @cached(ttl: 1) {
  v1_chains {
    chain_id
    assets {
      decimals
      denom
      display_name
      display_symbol
      gas_token
      logo_uri
    }
  }
}