IndexedEx integration (2026-10-19)

Read the repository CLAUDE.md and the relevant Crane/IndexedEx skill before using this topic. Current product law, registry/CREATE3 deployment, production-first tests, build-before-test ordering and configured Foundry profiles override generic examples. This archive-derived guide does not authorize broadcasts, dependency installs, new product integrations or restoration of retired protocol families. Use current deployment artifacts and the pinned frontend/tool versions; archived addresses and API samples are not live verification. Resolve topic names through scripts/codex-skill-catalog.json when they are grouped behind routers.

ERC20 approval ops (cast)

Goal

Set or clear ERC20 allowances for a spender (router, vault, Permit2) safely.

Prerequisites

• Token + spender addresses from address tables
• foundry-agent-safety before writes
• WALLET_ADDRESS = agent wallet

export TOKEN=0x...
export SPENDER=0x...
export WALLET_ADDRESS=$(cast wallet address --private-key $PRIVATE_KEY)

Inspect

cast call $TOKEN "allowance(address,address)(uint256)" $USER $SPENDER --rpc-url $ETH_RPC_URL
cast call $TOKEN "balanceOf(address)(uint256)" $USER --rpc-url $ETH_RPC_URL
cast call $TOKEN "decimals()(uint8)" --rpc-url $ETH_RPC_URL

Dry-run

Reads only. Plan amount: prefer exact amount over max type(uint256).max when possible.

Execute — standard approve

cast send $TOKEN "approve(address,uint256)" $SPENDER $AMOUNT \
  --rpc-url $ETH_RPC_URL --private-key $PRIVATE_KEY

Execute — USDT-like reset (non-zero → non-zero may revert)

# 1) reset
cast send $TOKEN "approve(address,uint256)" $SPENDER 0 \
  --rpc-url $ETH_RPC_URL --private-key $PRIVATE_KEY
# 2) set new amount
cast send $TOKEN "approve(address,uint256)" $SPENDER $AMOUNT \
  --rpc-url $ETH_RPC_URL --private-key $PRIVATE_KEY

Verify

cast call $TOKEN "allowance(address,address)(uint256)" $USER $SPENDER --rpc-url $ETH_RPC_URL
cast receipt $TX --rpc-url $ETH_RPC_URL

Common failures

• USDT-style tokens require zero-first
• Wrong spender (Vault vs Router vs Permit2)
• Amount units ignore decimals

Related

• erc20-ops, permit2-allowance-cast (when spender pulls via Permit2)