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AgentShelf Base eth_call
x402
AgentShelf Base eth_call is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-18).
Executes a read-only eth_call on Base mainnet and returns the decoded result or revert reason, with no state change and no gas spend.
Price / call$0.004
Success—
StatusUnknown
How this service works
Call when an agent needs a read-only Base eth_call. Send to and data (hex) or a function signature plus args. Optional from and block. Reverts return a decoded reason. No state change and no spend. Send JSON {"to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","data":"0x18160ddd"}. Exact $0.004 USDC on Base. Try unpaid POST /v1/sandbox/base-eth-call first.
Output
Returns the decoded output of the eth_call — typically a typed value such as a uint256, address, or string. If the call reverts, returns a decoded revert reason string. No transaction is submitted and no state is modified.
Example use cases
Check ERC-20 token total supply
“What's the total supply of USDC on Base? The contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — use the totalSupply() function.”
Read token balance for a wallet
“How many USDC tokens does 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 hold on Base? Use balanceOf(address) on the USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Query token decimals for price math
“What are the decimals for the token at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base? Call the decimals() function so I can format the amounts correctly.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/base-eth-call?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to read on-chain state from Base mainnet without submitting a transaction — e.g. querying token balances, supply, decimals, or any view/pure function. Prefer it over general RPC nodes when you want a simple HTTP POST interface with decoded results and clear revert reasons. The sandbox endpoint (/v1/sandbox/base-eth-call) is available for free testing before committing the $0.004 USDC fee.
Side effects
- Invalid contract address returns an error
- Malformed or mismatched calldata/signature causes a revert with decoded reason
- Specifying both 'data' and 'signature' returns a validation error
- Invalid block tag or number returns an error
- Network or RPC unavailability causes a 5xx response
- Payment not included or insufficient returns a 402 Payment Required (try sandbox first)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Contract to call on Base. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The call is eth_call with no value, so it cannot change state. |
| args | string | JSON array of arguments. Example: ["0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"]. A POST array is accepted. Requires signature. |
| data | string | Calldata, 0x hex, at most 2048 characters. Example: 0x18160ddd (totalSupply()). Send data or signature, not both. eth_call cannot change state. |
| from | string | Optional eth_call from address. Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. It is not a transaction sender and nothing is spent. |
| block | string | Block tag or number for eth_call. latest, finalized, safe, or a non-negative integer. Omit it for latest. The call is read-only. |
| signature | string | Function signature. Example: decimals() or balanceOf(address)(uint256). args is a JSON array when the function has parameters. Send signature or data, not both. |
Tags
x402
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