Debridge Agent Skill

Complete deBridge Protocol SDK for building cross-chain bridges, message passing, and token transfers on Solana. Use when building cross-chain applications, bridging assets between Solana and EVM chains, or implementing trustless external calls.

29k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

122

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/sendaifun/skills --skill debridge

What comes with it

98 175 bytes besides the instruction

docs/troubleshooting.md

examples/basic-transfer/README.md

examples/external-calls/README.md

examples/fee-configurations/README.md

examples/message-passing/README.md

resources/chain-ids.md

resources/error-codes.md

resources/program-ids.md

resources/sdk-api-reference.md

The instruction itself

45 sections, as written by the author

deBridge Solana SDK Development Guide

A comprehensive guide for building Solana programs with the deBridge Solana SDK - enabling decentralized cross-chain transfers of arbitrary messages and value between blockchains.

Overview

deBridge is a cross-chain infrastructure protocol enabling:

Cross-Chain Transfers: Bridge assets between Solana and 20+ EVM chains
Message Passing: Send arbitrary messages across blockchains
External Calls: Execute smart contract calls on destination chains
Sub-Second Settlement: ~2 second median settlement time
Capital Efficiency: Intent-based architecture with 4bps lowest spreads

Key Features

26+ security audits (Halborn, Zokyo, Ackee Blockchain)
$200K bug bounty on Immunefi
100% uptime since launch
Zero security incidents

Quick Start

Installation

Add the SDK to your Anchor/Solana program:

cargo add --git ssh://[email protected]/debridge-finance/debridge-solana-sdk.git debridge-solana-sdk

Or add to Cargo.toml:

[dependencies]
debridge-solana-sdk = { git = "ssh://[email protected]/debridge-finance/debridge-solana-sdk.git" }

Basic Setup (Anchor)

use anchor_lang::prelude::*;
use debridge_solana_sdk::prelude::*;

declare_id!("YourProgramId11111111111111111111111111111");

#[program]
pub mod my_bridge_program {
    use super::*;

    pub fn send_cross_chain(
        ctx: Context<SendCrossChain>,
        target_chain_id: [u8; 32],
        receiver: Vec<u8>,
        amount: u64,
    ) -> Result<()> {
        // Invoke deBridge send
        debridge_sending::invoke_debridge_send(
            debridge_sending::SendIx {
                target_chain_id,
                receiver,
                is_use_asset_fee: false,  // Use native SOL for fees
                amount,
                submission_params: None,
                referral_code: None,
            },
            ctx.remaining_accounts,
        )?;

        Ok(())
    }
}

#[derive(Accounts)]
pub struct SendCrossChain<'info> {
    #[account(mut)]
    pub sender: Signer<'info>,
    // Additional accounts passed via remaining_accounts
}

Core Concepts

1. Chain IDs

deBridge uses 32-byte chain identifiers for all supported networks:

use debridge_solana_sdk::chain_ids::*;

// Solana
let solana = SOLANA_CHAIN_ID;  // Solana mainnet

// EVM Chains
let ethereum = ETHEREUM_CHAIN_ID;     // Chain ID: 1
let polygon = POLYGON_CHAIN_ID;       // Chain ID: 137
let bnb = BNB_CHAIN_CHAIN_ID;         // Chain ID: 56
let arbitrum = ARBITRUM_CHAIN_ID;     // Chain ID: 42161
let avalanche = AVALANCHE_CHAIN_ID;   // Chain ID: 43114
let fantom = FANTOM_CHAIN_ID;         // Chain ID: 250
let heco = HECO_CHAIN_ID;             // Chain ID: 128

2. Program IDs

use debridge_solana_sdk::{DEBRIDGE_ID, SETTINGS_ID};

// Main deBridge program for sending/claiming
let debridge_program = DEBRIDGE_ID;

// Settings and confirmation storage program
let settings_program = SETTINGS_ID;

3. Fee Structure

deBridge supports multiple fee payment methods:

// Native Fee (SOL)
is_use_asset_fee: false  // Pay fees in SOL

// Asset Fee
is_use_asset_fee: true   // Pay fees in the bridged token

// Fee Constants
const BPS_DENOMINATOR: u64 = 10000;  // Basis points divisor

4. Flags

Control transfer behavior with flags:

use debridge_solana_sdk::flags::*;

// Available flags (bit positions)
const UNWRAP_ETH: u8 = 0;              // Unwrap to native ETH on destination
const REVERT_IF_EXTERNAL_FAIL: u8 = 1; // Revert if external call fails
const PROXY_WITH_SENDER: u8 = 2;       // Include sender in proxy call
const SEND_HASHED_DATA: u8 = 3;        // Send data as hash
const DIRECT_WALLET_FLOW: u8 = 31;     // Use direct wallet flow

// Setting flags on submission params
let mut flags = [0u8; 32];
flags.set_reserved_flag(UNWRAP_ETH);
flags.set_reserved_flag(REVERT_IF_EXTERNAL_FAIL);

Sending Cross-Chain Transfers

Basic Token Transfer

use debridge_solana_sdk::prelude::*;

pub fn send_tokens(
    ctx: Context<SendTokens>,
    amount: u64,
) -> Result<()> {
    debridge_sending::invoke_debridge_send(
        debridge_sending::SendIx {
            target_chain_id: chain_ids::ETHEREUM_CHAIN_ID,
            receiver: recipient_eth_address.to_vec(),
            is_use_asset_fee: false,
            amount,
            submission_params: None,
            referral_code: Some(12345),  // Optional referral
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

Transfer with Fixed Native Fee

pub fn send_with_native_fee(
    ctx: Context<Send>,
    target_chain_id: [u8; 32],
    receiver: Vec<u8>,
    amount: u64,
) -> Result<()> {
    // Get the fixed fee for the target chain
    let fee = debridge_sending::get_chain_native_fix_fee(
        &target_chain_id,
        ctx.remaining_accounts,
    )?;

    debridge_sending::invoke_debridge_send(
        debridge_sending::SendIx {
            target_chain_id,
            receiver,
            is_use_asset_fee: false,
            amount,
            submission_params: None,
            referral_code: None,
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

Transfer with Asset Fee

pub fn send_with_asset_fee(
    ctx: Context<Send>,
    target_chain_id: [u8; 32],
    receiver: Vec<u8>,
    amount: u64,
) -> Result<()> {
    // Check if asset fee is available for this chain
    let is_available = debridge_sending::is_asset_fee_available(
        &target_chain_id,
        ctx.remaining_accounts,
    )?;

    if !is_available {
        return Err(error!(ErrorCode::AssetFeeNotAvailable));
    }

    debridge_sending::invoke_debridge_send(
        debridge_sending::SendIx {
            target_chain_id,
            receiver,
            is_use_asset_fee: true,  // Use asset for fees
            amount,
            submission_params: None,
            referral_code: None,
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

Transfer with Exact Amount

pub fn send_exact_amount(
    ctx: Context<Send>,
    target_chain_id: [u8; 32],
    receiver: Vec<u8>,
    exact_receive_amount: u64,
) -> Result<()> {
    // Calculate total amount including fees
    let total_with_fees = debridge_sending::add_all_fees(
        exact_receive_amount,
        &target_chain_id,
        ctx.remaining_accounts,
    )?;

    debridge_sending::invoke_debridge_send(
        debridge_sending::SendIx {
            target_chain_id,
            receiver,
            is_use_asset_fee: true,
            amount: total_with_fees,
            submission_params: None,
            referral_code: None,
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

Transfer from PDA (Signed)

pub fn send_from_pda(
    ctx: Context<SendFromPda>,
    target_chain_id: [u8; 32],
    receiver: Vec<u8>,
    amount: u64,
    pda_seeds: Vec<Vec<u8>>,
) -> Result<()> {
    // Use signed variant for PDA-owned tokens
    debridge_sending::invoke_debridge_send_signed(
        debridge_sending::SendIx {
            target_chain_id,
            receiver,
            is_use_asset_fee: false,
            amount,
            submission_params: None,
            referral_code: None,
        },
        ctx.remaining_accounts,
        &pda_seeds,
    )?;

    Ok(())
}

Message Passing

Send messages without token transfers:

use debridge_solana_sdk::prelude::*;

pub fn send_message(
    ctx: Context<SendMessage>,
    target_chain_id: [u8; 32],
    receiver: Vec<u8>,
    message_data: Vec<u8>,
) -> Result<()> {
    // Create submission params with message
    let submission_params = debridge_sending::SendSubmissionParamsInput {
        execution_fee: 0,
        flags: [0u8; 32],
        fallback_address: receiver.clone(),
        external_call_shortcut: compute_keccak256(&message_data),
    };

    // Send message (zero amount)
    debridge_sending::invoke_send_message(
        debridge_sending::SendIx {
            target_chain_id,
            receiver,
            is_use_asset_fee: false,
            amount: 0,  // No token transfer
            submission_params: Some(submission_params),
            referral_code: None,
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

External Calls

Execute smart contract calls on destination chains:

Initialize External Call Buffer

pub fn init_external_call(
    ctx: Context<InitExternalCall>,
    target_chain_id: [u8; 32],
    external_call_data: Vec<u8>,
) -> Result<()> {
    let shortcut = compute_keccak256(&external_call_data);

    debridge_sending::invoke_init_external_call(
        debridge_sending::InitExternalCallIx {
            external_call_len: external_call_data.len() as u32,
            chain_id: target_chain_id,
            external_call_shortcut: shortcut,
            external_call: external_call_data,
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

Send with External Call

pub fn send_with_external_call(
    ctx: Context<SendWithExternalCall>,
    target_chain_id: [u8; 32],
    receiver: Vec<u8>,  // Target contract address
    amount: u64,
    external_call_data: Vec<u8>,
    execution_fee: u64,  // Fee for executor on destination
) -> Result<()> {
    let shortcut = compute_keccak256(&external_call_data);

    // Set flags for external call behavior
    let mut flags = [0u8; 32];
    flags.set_reserved_flag(flags::REVERT_IF_EXTERNAL_FAIL);

    let submission_params = debridge_sending::SendSubmissionParamsInput {
        execution_fee,
        flags,
        fallback_address: ctx.accounts.fallback.key().to_bytes().to_vec(),
        external_call_shortcut: shortcut,
    };

    debridge_sending::invoke_debridge_send(
        debridge_sending::SendIx {
            target_chain_id,
            receiver,
            is_use_asset_fee: false,
            amount,
            submission_params: Some(submission_params),
            referral_code: None,
        },
        ctx.remaining_accounts,
    )?;

    Ok(())
}

Claim Verification

Verify claims on the receiving side:

Validate Incoming Claims

use debridge_solana_sdk::check_claiming::*;

pub fn receive_tokens(ctx: Context<ReceiveTokens>) -> Result<()> {
    // Get and validate the parent claim instruction
    let claim_ix = ValidatedExecuteExtCallIx::try_from_current_ix()?;

    // Validate submission details
    let validation = SubmissionAccountValidation {
        receiver_validation: Some(ctx.accounts.receiver.key()),
        token_mint_validation: Some(ctx.accounts.token_mint.key()),
        source_chain_id_validation: Some(chain_ids::ETHEREUM_CHAIN_ID),
        ..Default::default()
    };

    claim_ix.validate_submission_account(
        &ctx.accounts.submission_account,
        &validation,
    )?;

    // Proceed with claim logic
    Ok(())
}

Get Submission Key

pub fn get_claim_info(ctx: Context<ClaimInfo>) -> Result<Pubkey> {
    let claim_ix = ValidatedExecuteExtCallIx::try_from_current_ix()?;
    let submission_key = claim_ix.get_submission_key()?;
    Ok(submission_key)
}

Fee Queries

Get Transfer Fees

// Get base transfer fee (in BPS)
let transfer_fee = debridge_sending::get_transfer_fee(
    ctx.remaining_accounts,
)?;

// Get transfer fee for specific chain
let chain_fee = debridge_sending::get_transfer_fee_for_chain(
    &target_chain_id,
    ctx.remaining_accounts,
)?;

// Get default native fix fee
let default_fee = debridge_sending::get_default_native_fix_fee(
    ctx.remaining_accounts,
)?;

// Get chain-specific native fix fee
let native_fee = debridge_sending::get_chain_native_fix_fee(
    &target_chain_id,
    ctx.remaining_accounts,
)?;

// Get asset fix fee for chain
let asset_fee = debridge_sending::try_get_chain_asset_fix_fee(
    &target_chain_id,
    ctx.remaining_accounts,
)?;

Calculate Total Amount with Fees

// Add transfer fee to amount
let with_transfer_fee = debridge_sending::add_transfer_fee(
    amount,
    ctx.remaining_accounts,
)?;

// Add all fees (transfer + execution + asset fees)
let total_amount = debridge_sending::add_all_fees(
    amount,
    &target_chain_id,
    ctx.remaining_accounts,
)?;

Chain Support Queries

// Check if chain is supported
let is_supported = debridge_sending::is_chain_supported(
    &target_chain_id,
    ctx.remaining_accounts,
)?;

// Get chain support info
let chain_info = debridge_sending::get_chain_support_info(
    &target_chain_id,
    ctx.remaining_accounts,
)?;

// Check if asset fee is available
let asset_fee_available = debridge_sending::is_asset_fee_available(
    &target_chain_id,
    ctx.remaining_accounts,
)?;

PDA Derivation

Bridge Account

use debridge_solana_sdk::keys::*;

// Find bridge PDA for a token mint
let (bridge_address, bump) = BridgePubkey::find_bridge_address(&token_mint);

// Create with known bump
let bridge_address = BridgePubkey::create_bridge_address(&token_mint, bump)?;

Chain Support Info

// Find chain support info PDA
let (chain_support_info, bump) = ChainSupportInfoPubkey::find_chain_support_info_address(
    &target_chain_id,
);

Asset Fee Info

// Find asset fee info PDA
let (asset_fee_info, bump) = AssetFeeInfoPubkey::find_asset_fee_info_address(
    &bridge_pubkey,
    &target_chain_id,
);

// Get default bridge fee address
let default_fee = AssetFeeInfoPubkey::default_bridge_fee_address();

External Call Storage

// Find external call storage PDA
let (storage, bump) = ExternalCallStoragePubkey::find_external_call_storage_address(
    &shortcut,
    &owner,
);

// Find external call meta PDA
let (meta, bump) = ExternalCallMetaPubkey::find_external_call_meta_address(
    &storage_account,
);

Required Accounts

The SDK requires specific accounts passed via remaining_accounts. The account order is important:

|-------|---------|--------|----------|-------------|

| 0 | Bridge | No | Yes | Bridge account for token |

| 1 | Token Mint | No | No | SPL Token mint |

| 2 | Staking Wallet | No | Yes | Staking rewards wallet |

| 3 | Mint Authority | No | No | Token mint authority |

| 4 | Chain Support Info | No | No | Target chain config |

| 5 | Settings Program | No | No | deBridge settings |

| 6 | SPL Token Program | No | No | Token program |

| 7 | State | No | No | Protocol state |

| 8 | deBridge Program | No | No | Main deBridge program |

| ... | Additional accounts | - | - | Varies by operation |

TypeScript Client Integration

Setup

import { Connection, Keypair, PublicKey, Transaction } from '@solana/web3.js';
import { Program, AnchorProvider, Wallet } from '@coral-xyz/anchor';

const connection = new Connection('https://api.mainnet-beta.solana.com');
const wallet = new Wallet(keypair);
const provider = new AnchorProvider(connection, wallet, {});

// deBridge Program IDs
const DEBRIDGE_PROGRAM_ID = new PublicKey('DEbrdGj3HsRsAzx6uH4MKyREKxVAfBydijLUF3ygsFfh');
const SETTINGS_PROGRAM_ID = new PublicKey('DeSetTwWhjZq6Pz9Kfdo1KoS5NqtsM6G8ERbX4SSCSft');

Build Send Transaction

import {
  TOKEN_PROGRAM_ID,
  getAssociatedTokenAddress
} from '@solana/spl-token';

async function buildSendTransaction(
  tokenMint: PublicKey,
  amount: bigint,
  targetChainId: Uint8Array,
  receiver: Uint8Array,
): Promise<Transaction> {
  // Derive required PDAs
  const [bridge] = PublicKey.findProgramAddressSync(
    [Buffer.from('BRIDGE'), tokenMint.toBuffer()],
    DEBRIDGE_PROGRAM_ID
  );

  const [chainSupportInfo] = PublicKey.findProgramAddressSync(
    [Buffer.from('CHAIN_SUPPORT_INFO'), targetChainId],
    SETTINGS_PROGRAM_ID
  );

  const [state] = PublicKey.findProgramAddressSync(
    [Buffer.from('STATE')],
    DEBRIDGE_PROGRAM_ID
  );

  // Build instruction with remaining accounts
  const instruction = await program.methods
    .sendViaDebridge(
      Array.from(targetChainId),
      Array.from(receiver),
      new BN(amount.toString()),
    )
    .remainingAccounts([
      { pubkey: bridge, isSigner: false, isWritable: true },
      { pubkey: tokenMint, isSigner: false, isWritable: false },
      // ... additional required accounts
    ])
    .instruction();

  return new Transaction().add(instruction);
}

Build External Call Data

import { ethers } from 'ethers';
import { keccak256 } from '@ethersproject/keccak256';

function buildExternalCallData(
  targetContract: string,
  functionSig: string,
  params: any[]
): { data: Uint8Array; shortcut: Uint8Array } {
  const iface = new ethers.Interface([functionSig]);
  const calldata = iface.encodeFunctionData(
    functionSig.split('(')[0].replace('function ', ''),
    params
  );

  const data = ethers.getBytes(calldata);
  const shortcut = ethers.getBytes(keccak256(data));

  return { data, shortcut };
}

// Example: ERC20 approve call
const { data, shortcut } = buildExternalCallData(
  '0xTargetContract...',
  'function approve(address spender, uint256 amount)',
  ['0xSpenderAddress...', ethers.parseEther('1000')]
);

Testing

Anchor Test Setup

# Anchor.toml
[provider]
cluster = "mainnet"  # Use mainnet for testing with real deBridge

[programs.mainnet]
my_program = "YourProgramId..."

Run Tests

# Full build and test
cd example_program && anchor build && anchor test

# Test only (skip rebuild)
anchor test --skip-build --skip-deploy

Local Testing Tips

Use Mainnet Fork: deBridge infrastructure is on mainnet
Mock Remaining Accounts: Create mock accounts for unit tests
Test Fee Calculations: Verify fee amounts before sending

Build Features

The SDK supports different environments via Cargo features:

# Production (default) - uses hardcoded program IDs
debridge-solana-sdk = { git = "..." }

# Custom environment - uses env vars
debridge-solana-sdk = { git = "...", features = ["env"] }

Environment variables for custom networks:

DEBRIDGE_PROGRAM_PUBKEY: Custom deBridge program ID
DEBRIDGE_SETTINGS_PROGRAM_PUBKEY: Custom settings program ID

Resources

Skill Structure

debridge/
├── SKILL.md                          # This file
├── resources/
│   ├── sdk-api-reference.md          # Complete SDK API reference
│   ├── chain-ids.md                  # Supported chain identifiers
│   ├── program-ids.md                # Program IDs and PDAs
│   └── error-codes.md                # Error types and handling
├── examples/
│   ├── basic-transfer/               # Simple cross-chain transfer
│   ├── external-calls/               # External call execution
│   ├── message-passing/              # Message-only transfers
│   └── fee-configurations/           # Fee payment options
└── docs/
    └── troubleshooting.md            # Common issues and solutions

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