# APIs

`nimbus-eth2`  exposes a collection of APIs for querying the state of the application at runtime.

> **Note:** Where applicable, these APIs mimic the [eth2 APIs](https://github.com/ethereum/eth2.0-APIs) with the exception that JSON-RPC is used instead of http rest (the method names, parameters and results are all the same except for the encoding / access method).

## Introduction

The `nimbus-eth2` API is implemented using JSON-RPC 2.0. To query it, you can use a JSON-RPC library in the language of your choice, or a tool like `curl` to access it from the command line. A tool like [jq](https://stedolan.github.io/jq/) is helpful to pretty-print the responses.

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"peers","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

Before you can access the API, make sure it's enabled using the RPC flag (`nimbus_beacon_node --rpc`):

```
     --rpc                     Enable the JSON-RPC server.
     --rpc-port                HTTP port for the JSON-RPC service.
     --rpc-address             Listening address of the RPC server.
```

One difference is that currently endpoints that correspond to specific ones from the [spec](https://ethereum.github.io/eth2.0-APIs/) are named weirdly - for example an endpoint such as [`getGenesis`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getGenesis) is currently named `get_v1_beacon_genesis` which would map 1:1 to the actual REST path in the future - verbose but unambiguous.

## Beacon Node API

### getBeaconHead

The latest head slot, as chosen by the latest fork choice.

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"getBeaconHead","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### getChainHead

Show chain head information, including head, justified and finalized checkpoints.

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"getChainHead","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### getSyncing

### getNetworkPeerId

### getNetworkPeers

### getNetworkEnr

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"getNetworkEnr","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_genesis`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getGenesis)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_genesis","params":[],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_states_root`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getStateRoot)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_states_root","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_states_fork`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getStateFork)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_states_fork","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_states_finality_checkpoints`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getStateFinalityCheckpoints)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_states_finality_checkpoints","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_states_stateId_validators`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getStateValidators)

### [`get_v1_beacon_states_stateId_validators_validatorId`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getStateValidator)

### [`get_v1_beacon_states_stateId_committees_epoch`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getEpochCommittees)

### [`get_v1_beacon_headers`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getBlockHeaders)

### [`get_v1_beacon_headers_blockId`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getBlockHeader)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_headers_blockId","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_blocks_blockId`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getBlock)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_blocks_blockId","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_blocks_blockId_root`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getBlockRoot)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_blocks_blockId_root","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_beacon_blocks_blockId_attestations`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/getBlockAttestations)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_beacon_blocks_blockId_attestations","params":["finalized"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`post_v1_beacon_pool_attestations`](https://ethereum.github.io/eth2.0-APIs/#/Beacon/submitPoolAttestations)

## Valdiator API

### [`get_v1_validator_block`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/produceBlock)

### [`post_v1_validator_block`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/publishBlock)

### [`get_v1_validator_attestation`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/produceAttestation)

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_validator_attestation_data","params":[0,3],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_validator_aggregate_and_proof`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/getAggregatedAttestation)

### [`post_v1_validator_aggregate_and_proof`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/publishAggregateAndProof)

### [`post_v1_validator_duties_attester`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/getAttesterDuties)

```
curl -d '{"jsonrpc":"2.0","method":"post_v1_validator_duties_attester","params":[1,["a7a0502eae26043d1ac39a39457a6cdf68fae2055d89c7dc59092c25911e4ee55c4e7a31ade61c39480110a393be28e8","a1826dd94cd96c48a81102d316a2af4960d19ca0b574ae5695f2d39a88685a43997cef9a5c26ad911847674d20c46b75"]],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### [`get_v1_validator_duties_proposer`](https://ethereum.github.io/eth2.0-APIs/#/ValidatorRequiredApi/getProposerDuties)

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"get_v1_validator_duties_proposer","params":[1] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

## Config

### [`get_v1_config_fork_schedule`](https://ethereum.github.io/eth2.0-APIs/#/Config/getForkSchedule)

## Administrative / Debug API

### `get_v1_debug_beacon_states_stateId` - returns an entire `BeaconState` object for the specified `stateId`

```
curl -d '{"jsonrpc":"2.0","method":"get_v1_debug_beacon_states_stateId","params":["head"],"id":1}' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### getNodeVersion

Show version of the software

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"getNodeVersion","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### getSpecPreset

Show spec constants in use.

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"getSpecPreset","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

### peers

Show a list of peers that the beacon node is connected to.

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"peers","params":[] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```

## Nimbus extensions

### setLogLevel

Set the current logging level dynamically: TRACE, DEBUG, INFO, NOTICE, WARN, ERROR or FATAL

```
curl -d '{"jsonrpc":"2.0","id":"id","method":"setLogLevel","params":["DEBUG; TRACE:discv5,libp2p; REQUIRED:none; DISABLED:none"] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
```