Tool detail

call

Simulates a read-only Ethereum contract call via eth_call without sending a transaction, returning the raw result.

Categories: Onchain data

Use when

simulate a contract call to preview its return value
read arbitrary contract state not covered by a dedicated endpoint

Not for

not a state-changing transaction — read-only simulation only

Inputs

POST JSON body: to (0x... contract, required), data (0x... calldata, required), from (0x..., optional), value (0x... hex, optional)

Admitted input schema

{
  "type": "object",
  "properties": {
    "data": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "pattern": "^0x[a-fA-F0-9]+$"
    },
    "from": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "pattern": "^0x[a-fA-F0-9]{40}$"
    },
    "to": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "pattern": "^0x[a-fA-F0-9]{40}$"
    },
    "value": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "pattern": "^0x[a-fA-F0-9]+$"
    }
  },
  "required": [
    "to",
    "data"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://api.onesource.io/api/chain/call

Payment

Protocol: x402
Listed price: 0.005 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://api.onesource.io/api/chain/call
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z