On-Chain Endpoints
Real-time on-chain data polled every 60 seconds from EVM RPCs, Blockstream (Bitcoin), and Solana JSON-RPC.
GET /v1/onchain/gas
Gas prices across all 7 EVM chains.
curl "https://api.crypton.dev/v1/onchain/gas"
{
"status": "ok",
"timestamp": 1709640000000,
"data": [
{
"chain": "arbitrum",
"gas_gwei": 0.01,
"block": 192000000,
"updated_at": 1709640000
},
{
"chain": "ethereum",
"gas_gwei": 25.5,
"block": 19500000,
"updated_at": 1709640000
}
]
}
Response Fields
Chain name: ethereum, base, arbitrum, polygon, bsc, optimism, avalanche.
Current gas price in Gwei.
Unix timestamp of last poll.
GET /v1/onchain/blocks
Block heights for all chains: 7 EVM + Bitcoin + Solana.
curl "https://api.crypton.dev/v1/onchain/blocks"
{
"status": "ok",
"timestamp": 1709640000000,
"data": [
{
"chain": "bitcoin",
"block_number": 840000,
"gas_gwei": null,
"updated_at": 1709640000
},
{
"chain": "ethereum",
"block_number": 19500000,
"gas_gwei": 25.5,
"updated_at": 1709640000
},
{
"chain": "solana",
"block_number": 250000000,
"gas_gwei": null,
"updated_at": 1709640000
}
]
}
Response Fields
Chain name. Includes all EVM chains plus bitcoin and solana.
Latest block number (or slot for Solana).
Gas price in Gwei. null for non-EVM chains (Bitcoin, Solana).
Unix timestamp of last poll.
GET /v1/onchain/supply
Stablecoin total supply across all EVM chains. Supports USDC and USDT.
# All stablecoins
curl "https://api.crypton.dev/v1/onchain/supply"
# Filter by token
curl "https://api.crypton.dev/v1/onchain/supply?token=USDC"
Query Parameters
Filter by token symbol (case-insensitive). Supported: USDC, USDT. Omit for all.
{
"status": "ok",
"timestamp": 1709640000000,
"data": [
{
"token": "USDC",
"chain": "ethereum",
"total_supply": 26000000000.0,
"updated_at": 1709640000
},
{
"token": "USDC",
"chain": "base",
"total_supply": 3500000000.0,
"updated_at": 1709640000
}
]
}
Response Fields
Token symbol (USDC or USDT).
Chain where the supply was measured.
Total supply on that chain (human-readable, decimals applied).
Unix timestamp of last poll.
GET /v1/onchain/exchange-flows
Exchange hot wallet balances on Ethereum (Binance, Coinbase).
curl "https://api.crypton.dev/v1/onchain/exchange-flows"
{
"status": "ok",
"timestamp": 1709640000000,
"data": [
{
"label": "binance_hot",
"chain": "ethereum",
"eth_balance": 500000.0,
"usdc_balance": 2000000000.0,
"usdt_balance": 1500000000.0,
"updated_at": 1709640000
},
{
"label": "coinbase_hot",
"chain": "ethereum",
"eth_balance": 200000.0,
"usdc_balance": 1000000000.0,
"usdt_balance": 500000000.0,
"updated_at": 1709640000
}
]
}
Response Fields
Exchange wallet label (e.g., binance_hot, coinbase_hot).
Chain (currently ethereum only).
ETH balance in the wallet.
USDC balance (human-readable).
USDT balance (human-readable).
Unix timestamp of last poll.
Data Sources
| Chain | RPC Source | Data |
|---|
| Ethereum | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply, exchange wallets |
| Base | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply |
| Arbitrum | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply |
| Polygon | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply |
| BSC | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply |
| Optimism | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply |
| Avalanche | LlamaRPC, Ankr, PublicNode | Gas, blocks, supply |
| Bitcoin | Blockstream API | Block height, mempool |
| Solana | Mainnet RPC, Ankr | Slot height |
Live Testing
# Gas prices across all chains
curl -s "https://api.crypton.dev/v1/onchain/gas" | jq '.data[:3]'
# Block heights for all 9 chains
curl -s "https://api.crypton.dev/v1/onchain/blocks" | jq '.data'
# USDC supply per chain
curl -s "https://api.crypton.dev/v1/onchain/supply?token=USDC" | jq '.data'
# Exchange wallet balances
curl -s "https://api.crypton.dev/v1/onchain/exchange-flows" | jq '.data'
