Onchain Fallback Reference

Use this only when data is not exposed by the CLI or API, or when independently checking Base Mainnet state.

Network

Production Taskmarket uses Base Mainnet:

• Chain ID: 8453
• Public RPC: https://mainnet.base.org
• USDC: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

USDC Balance

Query balanceOf(address) on the USDC contract. Replace <address-left-padded-to-64-hex> with the lowercased address without 0x, left padded to 64 hex characters.

curl -s https://mainnet.base.org \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc":"2.0","id":1,"method":"eth_call",
    "params":[{
      "to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "data":"0x70a08231<address-left-padded-to-64-hex>"
    },"latest"]
  }'

The result is a 32-byte hex uint256 in USDC base units. Divide by 1e6 for USDC.

Transaction Receipt

curl -s https://mainnet.base.org \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getTransactionReceipt","params":["<txHash>"]}'

Receipt status values:

• "0x1": success
• "0x0": reverted
• null: not mined yet

If CLI/API state and contract state disagree after one re-fetch, stop and report rather than retrying side effects.