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Base EIP-1559 Transaction Decode
x402
Base EIP-1559 Transaction Decode 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).
Decodes and analyzes a Base network EIP-1559 (type 0x2) transaction, extracting fields like chain ID, gas parameters, calldata, and network context.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing decoded transaction fields (chain_id, to address, value, nonce, gas_limit, max_fee_per_gas, max_priority_fee_per_gas, data/calldata, calldata_bytes, type), the analyzed network (base_mainnet), network context (OP Stack protocol family, accepted chain IDs, fee model), evidence scope, warnings (e.g. unsigned data caveat), and a full receipt with service metadata and a result SHA-256 hash.
Example use cases
Inspect unsigned transaction before signing
“I have an unsigned EIP-1559 transaction JSON that I'm about to sign and send on Base mainnet — can you decode it and tell me the recipient, value, gas limit, and max fee so I can verify it looks right?”
Analyze DeFi calldata on Base
“Here's a raw Base network transaction JSON — can you decode it and break down the calldata bytes, the contract being called, and the gas parameters so I can understand what it's doing?”
Debug failed or suspicious transaction
“I've got a Base EIP-1559 transaction JSON that I think might have wrong gas settings or be targeting the wrong address — can you decode it and flag any warnings or issues you find?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/base_eip1559_transaction_decode/invokeWhen to prefer
Choose this endpoint when you need to decode and inspect a Base network EIP-1559 (type 0x2) transaction before signing or broadcasting it, or to audit its fields programmatically. Ideal for agents working in the Base/OP Stack ecosystem that need structured extraction of gas parameters, calldata, and network context without connecting to a node. Prefer it over general-purpose Ethereum decoders when you specifically need Base mainnet network context and OP Stack fee model metadata.
Side effects
- Invalid or malformed transaction JSON returns a parsing error
- Transaction data not conforming to EIP-1559 type 0x2 structure may return partial or empty fields
- Chain ID not matching Base (8453 or 84532) may yield a network mismatch warning
- Oversized input exceeding 65536 characters will be rejected
- Unsigned transactions will always include a warning that broadcast/inclusion is not proven
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Unsigned or supplied transaction data does not prove broadcast or inclusion."
],
"service_id": "base_eip1559_transaction_decode",
"analysis_json": "{\"calldata_bytes\":68,\"chain_id\":\"8453\",\"data\":\"0xa9059cbb00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000064\",\"gas_limit\":\"21000\",\"max_fee_per_gas\":\"120\",\"max_priority_fee_per_gas\":\"5\",\"network\":\"base_mainnet\",\"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\",\"to\":\"0x0000000000000000000000000000000000000002\",\"type\":\"0x2\",\"value\":\"0\"}",
"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_eip1559_transaction_decode",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "b8f008e1ad2ebd54e69aeb7548fe98c69fb72d2571835fedd48ef59f441e3b30",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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