Call a smart contract function read-only (eth_call) on Ethereum, Base or Robinhood Chain (Tanod)
https://tanod.dev/v1/chain/callOverview
The raw ABI-encoded return data (`result`, `result_bytes`) of eth_call against `to` with your calldata at `latest`, `pending`, `finalized` or a block number; nothing is signed or sent. Body: `{"chain": "base", "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "data": "0x18160ddd"}`. The result is not decoded (decode_calldata decodes calldata; the ABI is yours). A call that reverts is a 422 `reverted` (not charged); results over 32 kB are a 502. Old blocks need an archive no
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