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Base Contract Creation Transaction Inspector
x402
Base Contract Creation Transaction Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).
Analyzes a Base blockchain contract creation transaction's raw JSON to extract creator, nonce, init code details, expected deployment address, gas, and network context without executing or deploying anything.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis object including the creator address, expected contract address (if derivable), init code byte length and hash, gas limit, nonce, transaction value, and OP Stack network context (accepted chain IDs, fee model, deposit transaction type). Also includes a list of warnings (e.g. if the expected address cannot be computed). The response notes that this analysis covers only caller-supplied data and does not prove deployment, runtime bytecode, or contract safety.
Example use cases
Pre-deployment contract address prediction
“I have a contract creation transaction JSON for Base mainnet — can you inspect it and tell me the expected deployment address, creator address, and any warnings before I actually send it?”
Init code analysis for audit trail
“Before we submit this contract deployment on Base, run the creation transaction JSON through an inspector and give me the init code hash, byte length, and nonce so I can add it to our audit log.”
Debugging a failed contract deployment
“This contract deployment didn't land where I expected on Base — can you analyze the creation transaction JSON and check the nonce, gas limit, and expected address to help me figure out what went wrong?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/base_contract_creation_inspect/invokeWhen to prefer
Use this endpoint when you need to statically analyze a Base (or Base Sepolia) contract creation transaction before broadcasting it — for example to predict deployment address, audit init code, or verify gas and nonce. It is ideal for pre-flight checks in deployment pipelines. Prefer this over on-chain simulation tools when you want fast, cheap, offline analysis without executing any code or making on-chain calls.
Side effects
- Malformed or invalid transaction JSON returns an error
- Missing creator address means expected deployment address cannot be computed (warned in output)
- Chain ID not in accepted list (8453 or 84532) may cause incorrect network context
- Very large init code may be rejected if request_json exceeds 65536 character limit
- Non-contract-creation transactions (e.g. ETH transfers) may produce misleading or empty analysis
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not prove deployment, runtime bytecode, or contract safety."
],
"service_id": "base_contract_creation_inspect",
"analysis_json": "{\"creator\":\"0x0000000000000000000000000000000000000001\",\"expected_address\":null,\"gas_limit\":\"21000\",\"init_code_bytes\":68,\"init_code_hash\":\"0x53893ee34a7f44a17cb623aa779750e71b27d6a76064cb515b6c5c42a4a973f7\",\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"nonce\":\"1\",\"value\":\"0\",\"warnings\":[\"expected address requires a supplied creator and nonce derivation\"]}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "base"
},
"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": "base_contract_creation_inspect",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "0befe26045f694a37ef5313f50373c55fe3f53c962bc47332319ce61d8b13e8d",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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