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Base USDC Balance Lookup
x402
Base USDC Balance Lookup is a paid API for AI agents from x402-46-225-191-113.sslip.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-23).
Fetches the block-pinned USDC token balance for a given Ethereum-compatible address on Base (chain ID 8453)
Price / call$0.003
Success—
StatusUnknown
How this service works
Temporary UTF-8 file handoff, cited HTTPX migration evidence and block-pinned Base USDC balances. See each route for its price, limits and output contract.
Output
Returns a JSON object with the USDC token contract address, the wallet's atomic and decimal USDC amounts, the block number and hash at which the read occurred, block timestamp, finality status (including finalized block hash and whether the read block is at or below the finalized block), RPC source URL, consistency method, number of read calls made, and an array of stated limitations about the single-provider nature of the reading and absence of USD valuation or proof-of-payment.
Example use cases
Pre-payment wallet balance check
“Before I send an invoice payment, check how much USDC the payer's wallet 0xabababababababababababababababababababab currently holds on Base so I know if they have enough funds.”
DeFi portfolio balance snapshot
“Grab the current USDC balance on Base for wallet 0x1234561234561234561234561234561234561234 and tell me the exact decimal amount along with the block number it was read at.”
Automated treasury monitoring
“Check the USDC balance on Base for our treasury address 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef and let me know whether the block has been finalized yet.”
Technical details
Endpoint
POSThttps://x402-46-225-191-113.sslip.io/v1/base-usdc-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a block-pinned, on-chain USDC balance reading for a specific wallet on Base (chain ID 8453) with explicit finality metadata. Prefer this over generic blockchain explorers when you need structured JSON output with atomic amounts, block hash, timestamp, and finality status in a single call, especially in automated agent workflows that require verifiable snapshot data.
Side effects
- Invalid or malformed address (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error
- RPC provider unavailability may cause timeout or 5xx error
- Payment of 0.003 USDC not provided via x402 results in 402 Payment Required
- Address has no USDC holdings — returns 0 balance with valid block metadata
- Block reorganization may make snapshot stale immediately after read
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string |
Output
Schema · Response
{
"type": "json",
"example": {
"token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"status": "ok",
"symbol": "USDC",
"address": "0xabababababababababababababababababababab",
"network": "eip155:8453",
"read_at": "2026-10-21T18:00:00+00:00",
"chain_id": 8453,
"decimals": 6,
"finality": {
"status": "unfinalized",
"finalized_block_hash": "0x3434343434343434343434343434343434343434343434343434343434343434",
"at_or_below_finalized": false,
"finalized_block_at_observation": 90
},
"block_hash": "0x1212121212121212121212121212121212121212121212121212121212121212",
"read_calls": 6,
"rpc_source": "https://example.invalid",
"consistency": "explicit block number with number/hash/timestamp rechecked after reads",
"limitations": [
"Single RPC provider assertion; no independent-node corroboration, ancestry verification or Merkle proof.",
"A latest-block snapshot can be reorganized or superseded; finality is the provider's observation, not an independent guarantee.",
"Token quantity only: no USD valuation, transaction history, source-of-funds determination or proof of invoice payment."
],
"block_number": 100,
"atomic_amount": "1234567",
"decimal_amount": "1.234567",
"block_timestamp": "2026-10-21T18:00:00+00:00"
}
}Tags
x402
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