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SignalHarness ABI Constructor Encode
x402
SignalHarness ABI Constructor Encode is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
ABI-encodes constructor arguments for Ethereum smart contract deployment bytecode
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing the ABI-encoded constructor calldata as a hex string in 'encoded_deployment_data', any warnings about the encoding process, the service_id, evidence_scope, and a full payment receipt with request/execution IDs, network (Base/eip155:8453), amount paid, latency, and a SHA-256 hash of the result for verification.
Example use cases
ERC20 token deployment encoding
“I'm deploying an ERC20 token and need the constructor arguments ABI-encoded — the constructor signature is (string name, string symbol, uint256 totalSupply) with values 'GoldToken', 'GLD', and 500000000000000000000000. Can you encode that for me so I can append it to my compiled bytecode?”
Proxy contract initializer encoding
“Help me ABI-encode the constructor args for a UUPS proxy deployment — the constructor takes an address for the implementation at 0xAbCd1234567890abcdef1234567890ABCDEF1234 and a uint256 version of 1. I need the encoded bytes to include in my deployment transaction.”
CREATE2 deterministic address preparation
“I want to do a CREATE2 deployment and need to encode the constructor parameters first — the contract constructor takes (address owner, uint256 fee) with owner 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef and fee 250. Can you give me the ABI-encoded constructor data?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/abi_constructor_encode/invokeWhen to prefer
Choose this endpoint when you need a hosted, pay-per-call service to ABI-encode Ethereum smart contract constructor arguments without setting up a local ethers.js or viem environment. Particularly useful for AI agents orchestrating contract deployments that lack a local EVM library, or when you need a reliable, receipted, auditable encoding step with a SHA-256 result hash for verification. At $0.01 USDC per call it is cost-effective for single deployments or low-frequency pipelines.
Side effects
- Invalid ABI constructor request JSON causes a parsing error
- Mismatched parameter types and values result in encoding failure or warnings
- Malformed ABI type strings (e.g. unrecognized Solidity types) cause rejection
- Request exceeds 65536 character limit returns validation error
- Payment failure via x402 protocol results in no execution
- Network or service unavailability returns a failed status in the receipt
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| abi_constructor_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Output is unsigned data and is never broadcast."
],
"service_id": "abi_constructor_encode",
"evidence_scope": "caller_supplied_data",
"encoded_deployment_data": "{\"data\":\"0x000000000000000000000000000000000000000000000000000000000000000001\"}"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "abi_constructor_encode",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "f13d5dc36871283c02d72af2313985dc961c981d9e12218d6a579e7cf37141e1",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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