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Introduction to Developer Documentation
Meter is DeFi infrastructure with a built-in, crypto-native, metastable currency called MTR. You can use Meter as a Layer 1 blockchain to build DeFi apps on top of, or as a highly-decentralized, high-performance side chain for Ethereum and other public chains.
There are two primary methods of interacting with Meter:
Ethereum RPC
In order to better support existing Ethereum dApp developers, we developed an Ethereum emulation mode for Meter. Through an addon module called webgear Meter nodes are able to understand Ethereum transaction format and support the standard Ethereum RPC interface. It is like using the Apple M1 silicon to run x86 applications with a 100x performance improvement. Developers are even able to use their preferred Ethereum development tools like Remix, ethers.js and web3.js to interact with Meter. Due to the limitations of the Ethereum RPC, not all Meter functionality is available in Ethereum emulation mode. In this mode, MTRG must be treated as a special ERC20 token via a system contract.
The other difference between Meter and Ethereum is that Meter removed the sequential nonce concept in Ethereum and uses a random number as nonce instead. The Ethereum emulation layer will automatically generate the random nonce, you will not be able to replace a transaction with the same nonce. Additionally, the sender of a transation must rely on the transaction hash returned by the node instead of generating it directly offline.
When interacting with Meter you must use "Injected Web3" in Remix alongside Metamask.
Testnet:
Warringstakes Testnet Endpoints:
Websocket: wss://ws.meter.io
ChainID: 83
Currency Symbol: MTR
ERC20 System Interface:
MTRG: 0x8a419ef4941355476cf04933e90bf3bbf2f73814
MTR: 0x4cb6cef87d8cadf966b455e8bd58fff32aba49d1
Mainnet:
RPC Endpoint:
RPC: https://rpc.meter.io (port 8545 on the mainnet docker)
Websocket: wss://ws.meter.io (port 8546 on the mainnet docker)
ChainID: 82
Currency Symbol: MTR
ERC20 System Interface:
-MTRG: 0x228ebBeE999c6a7ad74A6130E81b12f9Fe237Ba3
-MTR (Optional): 0x687A6294D0D6d63e751A059bf1ca68E4AE7B13E2
Currently, there is a limitation that MTR could only be sent to a contract address through smart contract interactions. For example, if you want to send MTR to a contract address manually, you will have to use the above ERC20 system interface.
Faucet for Testnet can be found at:
http://faucet-warringstakes.meter.io
RESTful API (Not Required if you are using Ethereum RPC toolchains)
This is the native interface for Meter and is directly supported by Meter node on port 8669. There is an additional mainnet endpoint at https://mainnet.meter.io:8667.
You are able to access all of our functionality and create Meter native transactions through this interface. We have implemented an Ethereum web3 compatible interface library called meterify.
In order to install Meterify run the following commands:
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npm install meterify
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Using the code below you can create a web3 instance. You are then able to use the Ethereum web3 interfaces to interact with the Meter mainnet.
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const meterify = require(“meterify”).meterify;
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const Web3 = require(“web3");
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const web3 = meterify(new Web3(), “https://mainnet.meter.io:8667”);
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