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Sending Transactions

This page goes over how to build an inbound MAYAChain transaction for each chain type.
Confirm you have:
  • Connected to Midgard or MAYANode
  • Located the latest vault (and router) for the chain
  • Prepared the transaction details (and memo)
  • Checked the network is not halted for your transaction
You are ready to make the transaction and swap via MAYAChain.

UTXO Chains

  • Send the transaction with Asgard vault as VOUT0
  • Include the memo as an OP_RETURN in VOUT1
  • Pass all change back to the VIN0 address in VOUT3
  • Use a high enough gas_rate to be included
  • Do not send below the dust threshold (10k Sats BTC, DASH), exhaustive values can be found on the Inbound Addresses endpoint
Inbound transactions should not be delayed for any reason else there is risk funds will be sent to an unreachable address. Use standard transactions, check the Inbound_Address before sending and use the recommended gas rate to ensure transactions are confirmed in the next block to the latest Inbound_Address.
Memo limited to 80 bytes on BTC. Use abbreviated options and MAYANames where possible.
Do not use HD wallets that forward the change to a new address, because MAYAChain IDs the user as the address in VIN0. The user must keep their VIN0 address funded for refunds.
Override randomised VOUT ordering; MAYAChain requires specific output ordering.

EVM Chains

depositWithExpiry(vault, asset, amount, memo, expiry)
  • If ERC20, approve the router to spend an allowance of the token first
  • Send the transaction as a depositWithExpiry() on the router
  • Vault is the Asgard vault address, asset is the token address to swap, memo as a string
  • Use an expiry which is +60mins on the current time (if the tx is delayed, it will get refunded)
  • Use a high enough gas_rate to be included, otherwise the tx will get stuck
ETH is 0x0000000000000000000000000000000000000000
ETH is sent and received as an internal transaction. Your wallet may not be set to read internal balances and transactions


  • Send the transaction to the Asgard vault
  • Include the memo
  • Only use the base asset as the choice for gas asset


To initiate a $CACAO-> $ASSET swap a MsgDeposit must be broadcasted to the MAYAChain blockchain. The MsgDeposit does not have a destination address, and has the following properties. The full definition can be found here.
Coins: coins,
Memo: memo,
Signer: signer,
If you are using Javascript, CosmJS is the recommended package to build and broadcast custom message types. Here is a walkthrough.
MsgDeposit must also be broadcasted when swapping from Synths.

Code Examples (Javascript)

  1. 1.
    Generate codec files. To build/broadcast native transactions in Javascript/Typescript, the protobuf files need to be generated into js types. The below script uses pbjs and pbts to generate the types using the relevant files from the MAYANode repo. Alternatively, the .js and .d.ts files can be downloaded directly from the XChainJS repo.
# this script checks out mayanode master and generates the proto3 typescript buindings for MsgDeposit and MsgSend
TMP_DIR=$(mktemp -d)
tput setaf 2; echo "Checking out to $TMP_DIR";tput sgr0
(cd $TMP_DIR && git clone
# Generate msgs
tput setaf 2; echo "Generating $MSG_COMPILED_OUTPUTFILE";tput sgr0
yarn run pbjs -w commonjs -t static-module $TMP_DIR/mayanode/proto/mayachain/v1/common/common.proto $TMP_DIR/mayanode/proto/mayachain/v1/x/mayachain/types/msg_deposit.proto $TMP_DIR/mayanode/proto/mayachain/v1/x/mayachain/types/msg_send.proto $TMP_DIR/mayanode/third_party/proto/cosmos/base/v1beta1/coin.proto -o $MSG_COMPILED_OUTPUTFILE
tput setaf 2; echo "Generating $MSG_COMPILED_TYPES_OUTPUTFILE";tput sgr0
tput setaf 2; echo "Removing $TMP_DIR/mayanode";tput sgr0
rm -rf $TMP_DIR
  1. 2.
    Using @cosmjs build/broadcast the TX.
const { DirectSecp256k1HdWallet, Registry } = require("@cosmjs/proto-signing");
const { defaultRegistryTypes: defaultStargateTypes, SigningStargateClient } = require("@cosmjs/stargate");
const { stringToPath } = require("@cosmjs/crypto");
const bech32 = require("bech32-buffer");
const { MsgDeposit } = require('./types/MsgCompiled').types
async function main() {
const myRegistry = new Registry(defaultStargateTypes);
myRegistry.register("/types.MsgDeposit", MsgDeposit);
const signerMnemonic = "mnemonic here"
const signerAddr = "thor1..."
const signer = await DirectSecp256k1HdWallet.fromMnemonic(
prefix: "maya", // MAYAChain prefix
hdPaths: [ stringToPath("m/44'/931'/0'/0/0")] // MAYAChain HD Path
const client = await SigningStargateClient.connectWithSigner(
{ registry: myRegistry },
const memo = `=:DASH/DASH:${signerAddr}` // MAYAChain memo
const msg = {
coins: [
asset: {
chain: "THOR",
symbol: "RUNE",
ticker: "RUNE"
amount: "10000000000" // Value in 1e10 (10000000000 = 1 CACAO)
memo: memo,
signer: bech32.decode(signerAddr).data,
const depositMsg = {
typeUrl: "/types.MsgDeposit",
value: MsgDeposit.fromObject(msg),
const fee = {
amount: [],
gas: "50000000", // Set arbitrarily high gas limit; this is not actually deducted from user account.
const response = await client.signAndBroadcast(signerAddr, [depositMsg], fee, memo);
console.log('response: ', response)
if (response.code !== 0) {
console.log('Error: ', response.rawLog)
} else {
Last modified 2mo ago