Northline ChainKit Transaction Explainer

x402

Northline ChainKit Transaction Explainer is a paid API for AI agents from northline-chainkit.northline-c86.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-30).

Fetches and explains a blockchain transaction (Base or Arc) by hash, returning status, gas fees, and token transfers in human-readable form

Price / call$0.004

Seller volume →—

Success—

StatusUnknown

How this service works

x402 pay-per-call onchain API (Base + Arc).

Output

Returns a JSON object with transaction status (success/failure), fee details (amount and symbol, e.g. 0.0000021 ETH), and an array of token transfers (each with amount and symbol, e.g. 5 USDC). Provides a human-readable breakdown of what occurred onchain.

Example use cases

Verify a USDC payment onchain

“I just sent USDC to a vendor and got a transaction hash — 0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b — can you confirm the payment went through on Base and tell me how much was transferred?”

Audit gas costs for a transaction

“What was the ETH fee paid for this Base transaction: 0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890ab? I want to know if we overpaid on gas.”

Decode an Arc chain transfer

“Can you decode this Arc chain transaction 0xdeadbeef1234567890deadbeef1234567890deadbeef1234567890deadbeef1234 and tell me what tokens were moved and whether it succeeded?”

Technical details

Endpoint

GEThttps://northline-chainkit.northline-c86.workers.dev/v1/tx/explain?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a quick, structured explanation of a specific transaction on Base or Arc, particularly when you need token transfer details and fee breakdown without running your own node. Best for agents that need to confirm payment receipt, audit gas costs, or summarize onchain activity for end users on Base or Arc specifically.

Side effects

Invalid or malformed transaction hash (must be 0x-prefixed 64 hex characters) returns a validation error
Transaction hash not found on the specified chain returns empty or error response
Unsupported chain value (only 'base' and 'arc' are valid) returns an error
Network/RPC timeout if the chain node is unreachable
Payment not processed (x402 payment required, insufficient USDC)

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "fee": {
      "amount": "0.0000021",
      "symbol": "ETH"
    },
    "status": "success",
    "tokenTransfers": [
      {
        "amount": "5",
        "symbol": "USDC"
      }
    ]
  }
}

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