Backing History

Last 30 days

Uptime

100%

Response time

116 ms typical, 116 ms slowest 5%

Last check

2 h ago

Next check

any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X GET "https://api.onesource.io/standard/v1/backing/history?hours=24"

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.onesource.io%2Fstandard%2Fv1%2Fbacking%2Fhistory
const res = await pay("https://api.onesource.io/standard/v1/backing/history?hours=24");
console.log(await res.json());

Example input

{
  "hours": 24
}

Example output

{
  "as_of_block": 63824000,
  "basis": "backing_history",
  "chain_id": 4663,
  "history": [
    {
      "basis": "measured",
      "block": 63800000,
      "circulating_raw": "500000000000000000000000",
      "contraction_eth_raw": "9000000000000000000",
      "eth_backing_per_standard_excluding_pol": "0.000054",
      "expansion_eth_raw": "18000000000000000000",
      "pol_eth_raw": null,
      "pol_std_raw": null,
      "ts": "2026-09-14T12:00:00Z"
    }
  ],
  "lag_blocks": 5,
  "network": "robinhood",
  "serving_state": "fresh"
}

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