Tool detail

first-funder

Traces a Base address's earliest inbound funding back up to N hops to find its first funder and ultimate origin.

Categories: Wallet analytics

Use when

trace the original funding source of a crypto wallet
check if a wallet's funds originated from a KYC'd exchange
run sybil or source-of-funds due diligence on an address

Not for

not financial advice — informational tracing only, per the listing
not a full transaction history — funding-origin trace only

Inputs

GET query params: address (string, required); hops (string, optional)

Admitted input schema

{
  "type": "object",
  "properties": {
    "address": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "EVM/chain address (required)"
    },
    "hops": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Hops (optional)"
    }
  },
  "required": [
    "address"
  ],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://api.x402node.dev/wallet/first-funder

Payment

Protocol: x402
Listed price: 0.10 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://api.x402node.dev/wallet/first-funder
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z