JSON-RPC reference

PressChain V3 exposes an Ethereum-compatible JSON-RPC interface. Existing EVM tooling can perform network reads, contract calls, log queries and signed transaction submission when configured for the PressChain network. Canonical public testnet endpoint:

https://rpc.presschain.io

Current Chain ID:

77117002

Hexadecimal Chain ID:

0x498B64A

Request format

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

Requests are sent with HTTP POST and content-type: application/json.

Verify chain identity

curl -s https://rpc.presschain.io \
  -H 'content-type: application/json' \
  --data '{"jsonrpc":"2.0","id":1,"method":"eth_chainId","params":[]}'

A V3 testnet client should expect 0x498B64A, allowing for case differences in hex output.

Current block

{"jsonrpc":"2.0","id":2,"method":"eth_blockNumber","params":[]}

The result is a hexadecimal quantity. Convert with a bigint-capable parser when the value is used programmatically.

Read a transaction receipt

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "eth_getTransactionReceipt",
  "params": ["0xTRANSACTION_HASH"]
}

A null result can mean the transaction is not yet included or is unknown to that node. That is different from a receipt whose status indicates execution failure.

Read contract state

Use eth_call with encoded ABI data:

{
  "jsonrpc": "2.0",
  "id": 4,
  "method": "eth_call",
  "params": [
    {"to":"0xCONTRACT","data":"0xENCODED_CALL"},
    "latest"
  ]
}

Use an ABI library rather than hand-encoding selectors unless you are building low-level tooling.

Methods commonly used by applications

Method	Typical use
`eth_chainId`	verify the network
`eth_blockNumber`	observe chain height
`eth_getBalance`	inspect native balance
`eth_call`	read a contract
`eth_getLogs`	index events
`eth_getTransactionByHash`	inspect a transaction
`eth_getTransactionReceipt`	confirm execution
`eth_getTransactionCount`	inspect account nonce
`eth_estimateGas`	estimate a prepared call
`eth_gasPrice`	obtain gas pricing signal
`eth_sendRawTransaction`	submit a signed transaction

Observability

Log RPC method, duration, endpoint class and error code. Do not log private keys, seed phrases or sensitive signing material. For submitted transactions, persist the transaction hash as soon as it is known. If a browser times out afterward, the hash gives the application a recovery path without creating a duplicate write.

Scaling reads

RPC is excellent for authoritative reads and verification. High-volume search, sorting and aggregation belong in an indexer or projection layer. A good PressChain application uses both: projections for product speed, RPC and contracts for authority.

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Reference

JSON-RPC Reference

JSON-RPC reference

Request format

Verify chain identity

Current block

Read a transaction receipt

Read contract state

Methods commonly used by applications

Observability

Scaling reads

​JSON-RPC reference

​Request format

​Verify chain identity

​Current block

​Read a transaction receipt

​Read contract state

​Methods commonly used by applications

​Observability

​Scaling reads

JSON-RPC reference

Request format

Verify chain identity

Current block

Read a transaction receipt

Read contract state

Methods commonly used by applications

Observability

Scaling reads