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Onesource · Chain Proxy

by Onesource

GETBaseDeveloper tools
$0.005
per call · USDC on Base

Detect upgradeable proxy patterns (EIP-1967, UUPS, Transparent) via eth_getStorageAt - returns the implementation address behind a proxy

Endpoint
GET https://api.onesource.io/api/chain/proxy/:address
227calls / 30dmeasured by x402.new
227paying wallets / 30dmeasured by x402.new
100%uptime · 314ms p95measured by x402-list.com
Acompliance grademeasured by x402-list.com

Listed in 3 directories: bazaar, x402-list, x402-new. First seen 5 Sept 2026.

Call this service

The endpoint answers an unpaid request with an HTTP 402 and a payment challenge. @x402/fetch signs it, pays in USDC, and retries — you get the result back in one call.

TypeScript · @x402/fetch
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const pay = wrapFetchWithPayment(fetch, account);

const res = await pay("https://api.onesource.io/api/chain/proxy/:address", {
  method: "GET",
});

console.log(await res.json());
Open the endpoint ↗On OpenSea's x402 Bazaar ↗Everything from api.onesource.io

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Uptime and compliance: x402-list.com (CC BY 4.0). Safety scores: x402.direct. Call and payer counts: x402.new. AMNT indexes this endpoint and does not host, operate or vouch for it.

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