agentutility(7)$ man erc20-balance
/erc20-balance
PRICE / CALL
$0.005
USDC · base mainnet · scheme: exact
METHOD
POST
CLUSTER
edgemarketCATEGORY
uncategorized
STATUS
● live
NAME
erc20-balance — reads an erc-20 token balance on-chain across any supported evm chain, including base, ethereum, arbitrum, optimism, and polygon
SYNOPSIS
POST https://x402.agentutility.ai/erc20-balance
Content-Type: application/json
X-PAYMENT: <signed-transferWithAuthorization>
{ ... }↳ first call →
402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.DESCRIPTION
Reads an ERC-20 token balance on-chain across any supported EVM chain, including Base, Ethereum, Arbitrum, Optimism, and Polygon. Co-fetches decimals to return both raw bigint and decimal-formatted balance. Supports historical block parameter. Useful for agent wallet introspection, payment reconciliation, treasury monitoring. Use it as a balanceOf reader, wallet balance lookup, or multi-chain ERC20 balance API.
INPUT — request schema
| property | type | description | req? |
|---|---|---|---|
| token | string | ERC-20 contract address (0x...). | required |
| wallet | string | Wallet address to query (0x...). | required |
| chain | any | Chain id or slug. 8453|'base' (default), 1|'ethereum', 42161|'arbitrum', 10|'optimism', 137|'polygon', 56|'bsc', 43114|'avalanche'. | optional |
| block | any | 'latest' default, or hex/decimal block number for historical reads. | optional |
OUTPUT — response shape
| field | type | description |
|---|---|---|
| chain | string | Echoed EVM chain name the balance was read from (e.g. base, ethereum, arbitrum, optimism, polygon). |
| chain_id | string | Numeric EVM chain ID as a string, matching the resolved chain (e.g. 8453 for Base, 1 for Ethereum). |
| token | string | ERC-20 contract address whose balanceOf was called, echoed back in lowercase hex. |
| wallet | string | Wallet address whose token balance was queried, echoed back in lowercase hex. |
| block | string | Block tag or number at which balanceOf was evaluated (latest, or a specific block height as string). |
| balance_raw | string | Raw balanceOf return value as a base-10 bigint string, before decimals scaling. |
| balance_hex | string | Raw balanceOf return value as a 0x-prefixed hex string straight from the eth_call response. |
| decimals | string | Token decimals fetched from the contract's decimals() call, used to format the human-readable balance. |
| balance | string | Decimal-formatted token balance as a string, scaled by decimals (e.g. 1234.5678 instead of raw units). |
EXAMPLES — two ways to call
EXAMPLE 1 · curl
curl -X POST https://x402.agentutility.ai/erc20-balance \
-H 'Content-Type: application/json' \
-d '{ }'first response =
402 Payment Required with payment requirements; sign + retry with X-PAYMENT.EXAMPLE 2 · mcp
# Install the MCP package for this endpoint's cluster npx -y @agentutility/mcp-<cluster> # Required: EVM private key with USDC on Base export X402_PRIVATE_KEY=0x... # Then call the erc20-balance tool from your MCP-aware agent.
MCP server handles payment automatically — your coding agent just calls the tool by name.
METADATA
- tags
- erc20balance-oftoken-balancewallet-balanceonchain-readevm-rpcmulti-chainerc20-balance
- methods
- POST
- cluster
- edgemarket
- price
- $0.005 USDC per call
ADJACENT — other endpoints in edgemarket
| endpoint | description | price |
|---|---|---|
| agent-card-resolve | Resolves an ERC-8004 agentId to its on-chain owner, agentURI, and agent card JSON. | $0.005 |
| arbitrage-spread | Finds the cross-exchange arbitrage spread for any CoinGecko-listed coin. | $0.005 |
| basename-resolve | Resolves Coinbase Basenames (.base.eth) to Ethereum addresses and back, reading the Base mainnet L2 Resolver on-chain (no gas, no wallet). | $0.005 |
| cid-fetch | Fetches the content behind an IPFS CID and optional path through public gateways, returning text, JSON, or base64 with a 5 MB cap. | $0.005 |
| current-balance | Reads a wallet's current ERC-20 token balance with a read-only balanceOf call on Base, Ethereum, Arbitrum, Optimism, Polygon, BSC, or Ava… | $0.005 |
| defi-yield-pools | Filters and ranks thousands of DeFi yield-bearing pools by APY across every chain DeFiLlama tracks. | $0.005 |
| erc20-metadata | Reads ERC-20 token metadata: name(), symbol(), decimals(), and totalSupply() in parallel via public RPC on Base, Ethereum, Arbitrum, Opti… | $0.005 |
| flagged-tokens | Feed of flagged risky Solana tokens: thin liquidity, extreme moves, sell pressure, very new pairs, and missing profile context. | $0.005 |
SEE ALSO