Onesource
Onesource provides pay-per-call Ethereum RPC endpoints for querying blocks, balances, contracts, NFTs, transactions, and event logs.
Trust signal
4 of 4 pillars
coverage 100%
Pillars
Signals
Evidence tiers, not an endorsement · trust model v0.1.0 (provisional) · CDP-lane settlement only (D3) · Trust API coming soon
On-chain traction
ERC-8004 agent registry
Not found in the ERC-8004 agent registry. This is the default state — absence is not a negative signal.
Identity & classification
Settlement volume
USDC settled on-chain · monthly
as of Jul 12, 2026
Endpoints(42)
Latest Ethereum block height - current chain tip via eth_blockNumber
Ethereum chain ID (EIP-155) via eth_chainId - confirm which chain a network is on
Ethereum network info - chain ID, block height, and gas price in one batched RPC call (eth_chainId + eth_blockNumber + eth_gasPrice)
ERC20 allowance via allowance (eth_call) - how much a spender is approved to move from an owner's wallet
Fetch an Ethereum block header and transaction hashes by number, tag, or hex via eth_getBlockByNumber
Check if an Ethereum address is a contract via eth_getCode - returns deployed bytecode
ERC1155 token balance via balanceOf (eth_call) - how many copies of a token_id a wallet holds
ERC20 token balance for any Ethereum wallet - USDC, USDT, DAI, or any token - via balanceOf (eth_call) on OneSource live Ethereum RPC
Live wallet balance - native ETH plus any ERC20 tokens in one call via eth_getBalance and balanceOf on OneSource Ethereum RPC
Look up the current owner of an ERC721 NFT by token_id via ownerOf (eth_call)
Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent
Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)
Fetch an Ethereum block header and transaction hashes by number, tag, or hex via eth_getBlockByNumber
Check if an Ethereum address is a contract via eth_getCode - returns deployed bytecode
Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent
Estimate the gas a transaction will consume via eth_estimateGas before signing it
Simulate a read-only Ethereum contract call via eth_call - no transaction sent
Contract introspection via eth_call - name, symbol, decimals, and ERC20/721/1155 interface support
ENS resolve - turn a .eth name into an address, or an address into its primary .eth name, via eth_call on OneSource live Ethereum RPC
ERC20 Transfer logs via eth_getLogs - decoded sender, recipient, and amount for a token or wallet
Query Ethereum contract event logs via eth_getLogs - filter by contract, topic, and block range
Detect upgradeable proxy patterns (EIP-1967, UUPS, Transparent) via eth_getStorageAt - returns the implementation address behind a proxy
Transaction receipt via eth_getTransactionReceipt - status, gas, and event logs for a mined Ethereum transaction
Read a raw storage slot from any Ethereum contract via eth_getStorageAt
Contract introspection via eth_call - name, symbol, decimals, and ERC20/721/1155 interface support
ENS resolve — turn a .eth name into an address, or an address into its primary .eth name, via eth_call on OneSource live Ethereum RPC
ENS resolve - turn a .eth name into an address, or an address into its primary .eth name, via eth_call on OneSource live Ethereum RPC
Detect upgradeable proxy patterns (EIP-1967, UUPS, Transparent) via eth_getStorageAt - returns the implementation address behind a proxy
Transaction receipt via eth_getTransactionReceipt - status, gas, and event logs for a mined Ethereum transaction
List every ERC721 NFT token_id a wallet owns in a collection via tokenOfOwnerByIndex (eth_call)
NFT metadata, traits, and image URI for any ERC721 or ERC1155 token - fetched via eth_call with IPFS resolution (OneSource live Ethereum RPC)
Full Ethereum transaction details by hash via eth_getTransactionByHash - from, to, value, calldata, block
Full Ethereum transaction details by hash via eth_getTransactionByHash - from, to, value, calldata, block
Pending Ethereum block - mempool transactions not yet mined, via eth_getBlockByNumber("pending")