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Base EIP-712 Typed Data Inspector
x402
Base EIP-712 Typed Data Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).
Parses and analyzes an EIP-712 typed data JSON payload, extracting domain, primary type, message keys, type dependencies, and Base network context without verifying signatures.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis object containing: whether the digest was computed, the parsed domain (name, chainId), the chain ID string, message keys, type dependencies per type, the primary type, and Base network context (accepted chain IDs, deposit transaction type, fee model, protocol family). Also includes warnings that no signature verification or application-level semantics are guaranteed.
Example use cases
Pre-signing typed data review
“Before I sign this EIP-712 request in my wallet, can you inspect the typed data JSON and tell me what primary type it uses, what domain it's for, and which fields are in the message? Here's the payload: {"types":{"Transfer":[{"name":"amount","type":"uint256"},{"name":"recipient","type":"address"}]},"domain":{"name":"MyDApp","chainId":8453},"primaryType":"Transfer","message":{"amount":1000,"recipient":"0xabc"}}”
Debugging malformed EIP-712 payload
“I'm building a dapp on Base and getting weird signing errors — can you parse this EIP-712 typed data JSON and extract the domain, primary type, type dependencies, and message keys so I can see what the structure actually looks like?”
Agent wallet signature preparation
“My agent needs to sign an EIP-712 message on Base — inspect this typed data JSON and return the domain chain ID, primary type, and all message keys so I can confirm it's targeting the right network before proceeding: {"types":{"Order":[{"name":"price","type":"uint256"}]},"domain":{"name":"Exchange","chainId":8453},"primaryType":"Order","message":{"price":500}}”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/base_eip712_typed_data_inspect/invokeWhen to prefer
Use this endpoint when you need to structurally parse and understand an EIP-712 typed data payload — especially for Base network transactions — without needing signature verification. Ideal for pre-signing inspection, debugging typed data structure, agent wallet preparation workflows, or educational analysis of EIP-712 schemas. Not suitable when you need actual signature verification or application-level semantic validation.
Side effects
- Malformed or non-JSON request_json input causes parsing failure
- EIP-712 JSON missing required fields may produce incomplete analysis
- Oversized payload (>65536 chars) rejected by schema validation
- Payment failure or insufficient USDC balance prevents execution
- Non-Base chain IDs still analyzed but network context reflects Base/OP Stack only
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not verify a signature or guarantee application semantics."
],
"service_id": "base_eip712_typed_data_inspect",
"analysis_json": "{\"digest_not_computed\":true,\"domain\":{\"chainId\":8453,\"name\":\"Example\"},\"domain_chain_id\":\"8453\",\"message_keys\":[\"value\"],\"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\"},\"primary_type\":\"Mail\",\"type_dependencies\":{\"Mail\":[\"uint256\"]}}",
"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_eip712_typed_data_inspect",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "09acdd1585139825f773d604e28fcde2941a3d078ab086a38b27854610f3ae02",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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