JSON-RPC API

Overview

c8ntinuum exposes an Ethereum-compatible JSON-RPC endpoint at https://public-evm-rpc.c8ntinuum.com. The default public EVM namespace allowlist is eth,net,web3. Archive or private node profiles may enable additional namespaces such as debug or txpool, but applications should not assume those namespaces are available on the default public endpoint.

Supported Namespaces

Namespace	Status	Description
`eth`	Enabled by default	Core Ethereum methods: accounts, blocks, transactions, and logs
`web3`	Enabled by default	Client version and utilities
`net`	Enabled by default	Network information
`txpool`	Configuration-dependent	Not in the default `api = "eth,net,web3"` list; present only on nodes that add `txpool`
`debug`	Full archive only	Intended for private full-archive debug nodes (see Archive Data), not the default public RPC
`personal`	Not for public RPC	Optional on private full-archive debug nodes; should not be exposed on default public RPC
`trace`	Not available	`ctmd` does not provide a separate `trace` namespace

The local development node started by local_node.sh enables eth,txpool,personal,net,debug,web3.

Commonly Used Methods

Method	Description
`eth_chainId`	Returns `0x8` (8)
`eth_blockNumber`	Latest block number
`eth_getBalance`	Account balance
`eth_getTransactionCount`	Account nonce
`eth_sendRawTransaction`	Submit a signed transaction
`eth_call`	Execute a call without creating a transaction
`eth_estimateGas`	Estimate gas for a transaction
`eth_getTransactionReceipt`	Get transaction receipt
`eth_getLogs`	Query event logs
`eth_gasPrice`	Current gas price
`eth_maxPriorityFeePerGas`	Current priority fee suggestion

For concrete block, transaction, receipt, log, broadcast, CometBFT, and REST/LCD examples, see Node Interface Calls.

Method availability matrix

Method family	Default public RPC	Private/archive node profile	Notes
`eth_*` core reads and writes	Supported	Supported	Includes blocks, balances, calls, gas estimation, receipts, logs, and raw transaction broadcast.
`net_*`	Supported	Supported	Network metadata helpers.
`web3_*`	Supported	Supported	Client utility methods.
`eth_subscribe` / `eth_unsubscribe`	Supported over WebSocket	Supported when WebSocket is enabled	Free public WebSocket connections have stricter concurrency limits.
`txpool_*`	Not enabled by default	Configuration-dependent	Do not require txpool methods for production application flows.
`debug_*`	Not enabled by default	Full archive/debug profile only	Use only on trusted private infrastructure.
`personal_*`	Not for public RPC	Configuration-dependent	Do not expose personal APIs on public RPC endpoints.
`trace_*`	Not available	Not available	`ctmd` does not provide `trace_*`; use debug APIs or an indexer where available.

Endpoint Configuration

Mainnet endpoints use three TLDs: c8ntinuum.com for the default public free RPCs, and c8ntinuum.io for alternate public and paid RPCs. c8ntinuum.link serves mainnet too, with the same host names as c8ntinuum.io (for example https://public-evm-rpc.c8ntinuum.link, and the paid https://evm-rpc.c8ntinuum.link). Testnet endpoints live on c8ntinuum.link only and have testnet in the hostname. For the canonical free / alternate / paid matrix and rate limits, see RPC Providers.

Network	Surface	Endpoint
Mainnet	Default public HTTP	`https://public-evm-rpc.c8ntinuum.com`
Mainnet	Default public WebSocket	`wss://public-evm-rpc.c8ntinuum.com/websocket`
Mainnet	Alternate public HTTP	`https://public-evm-rpc.c8ntinuum.io`
Mainnet	Alternate public WebSocket	`wss://public-evm-rpc.c8ntinuum.io/websocket`
Mainnet	Paid HTTP	`https://evm-rpc.c8ntinuum.io`
Mainnet	Paid WebSocket	`wss://evm-rpc.c8ntinuum.io/websocket`
Testnet	Public HTTP	`https://public-testnet-evm.c8ntinuum.link`
Testnet	Public WebSocket	`wss://public-testnet-evm.c8ntinuum.link/websocket`
Testnet	Paid HTTP	`https://testnet-evm.c8ntinuum.link`
Testnet	Paid WebSocket	`wss://testnet-evm.c8ntinuum.link/websocket`

Paid endpoints require a valid API key through X-API-Key or ?api_key=. To get one, email [email protected]; a dedicated self-service dashboard is planned.

Request policy

EVM JSON-RPC HTTP accepts POST / with Content-Type: application/json. OPTIONS is allowed for preflight compatibility. GET /, non-JSON POST /, and unsupported paths are rejected by the RPC proxy.

Setting	Value
`eth_getLogs` block range cap	`10000` blocks
`eth_getLogs` result cap	`10000` logs
Node batch request limit	`2000`
Node batch response max size	`50000000` bytes
nginx EVM HTTP request body limit	`2m`

Example Request

curl -X POST https://public-evm-rpc.c8ntinuum.com \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": 1
  }'

Introduction

Developer Essentials

Tooling and Infrastructure

Reference

Guides

Resources

Overview

Supported Namespaces

Commonly Used Methods

Method availability matrix

Endpoint Configuration

Request policy

Example Request

​Overview

​Supported Namespaces

​Commonly Used Methods

​Method availability matrix

​Endpoint Configuration

​Request policy

​Example Request

Overview

Supported Namespaces

Commonly Used Methods

Method availability matrix

Endpoint Configuration

Request policy

Example Request