Core API Modules
Most used
JSON-RPC 2.0 with failover, health checks, latency routing, batch support, and caching across 220+ chains.
Your unified API forsmarter Web3 infra.
Harness the power of 220+ blockchains through a single endpoint balances, swaps, RPC, gas, and indexing, all in one simple platform.
Connect to multiple blockchain networks through a single, unified API.
Ethereum
Bitcoin
Core
BNB Smart Chain
Solana
Polygon
Arbitrum
Base
Optimism
Avalanche
Aptos
TRON
NEAR
Sui
Cosmos
Algorand
Linea
Mantle
TON
Cardano
Polkadot
Stellar
Hedera
Celo220+
Supported networks
<500ms
Median latency
99.99%
Uptime
5B+
Calls/month
Core API Modules
Everything you need to build multi-chain dApps, wallets, analytic dashboards, and DeFi protocols.
Wallet API
Fetch balances, NFTs, transaction history, and full portfolio across every supported network with a single call.
Swap Engine
Multi-DEX aggregator with quote comparison, simulation, MEV protection, and cross-chain bridges.
Inner + Gas
Real-time indexing, decoded logs, gas tracking, and mempool monitoring for production applications.
Address Resolver
Validate addresses and resolve ENS, SNS, and Unstoppable Domains across supported chains.
API Gateway
API key authentication, rate limiting, CORS, validation, usage analytics, and resilient routing.
Simple, Powerful API
Get started in minutes. SDKs for JavaScript, Python, Go, Rust, and Swift.
https://nexxend.xyz/api/v1
API Endpoint
RESTful design. Consistent response format. Cursor-based pagination.
GET
/v1/chainsList all supported chainsGET
/v1/wallet/balancesAuto multi-chain wallet balancesGET
/v1/wallet/{chainId}/balancesToken balancesGET
/v1/wallet/{chainId}/nftsNFT holdingsGET
/v1/wallet/{chainId}/transactionsTx historyGET
/v1/portfolioCross-chain portfolioAPI Gateway
API key authentication, rate limiting, CORS, validation, and analytics.
# Auto-detect chains for a multi-chain wallet
curl https://nexxend.xyz/api/v1/wallet/balances \
-H "x-api-key: nx_your_api_key" \
-G -d "address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
# Get wallet balances on Ethereum
curl https://nexxend.xyz/api/v1/wallet/ethereum/balances \
-H "x-api-key: nx_your_api_key" \
-G -d "address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"Simple Pricing
High-performance infrastructure at the most affordable rates in Web3.
Free
$0/month
- 20 req/s · 100K calls/month
- 220+ Networks
- Wallet API
- Gas Fees Oracle
- Universal Resolver
- Community Support
Pro
$25/month
- 150 req/s · 5M/day
- Everything in Free
- Swap Engine API
- Indexer API
- Event Webhooks
- Priority support
Business
$115/month
- 500 req/s · 50M/day
- Everything in Pro
- MEV Protection
- Dedicated RPC Nodes
- 99.9% SLA
- Account Manager
Enterprise
Custom
- 2000+ req/s · Unlimited
- Global Load Balancing
- Custom Data Clusters
- White-label SDKs
- On-prem clusters
- 24/7 Phone Support
