# The Standard Reserve (TSR) Vault Snapshot History

> The Standard Reserve (TSR) Vault Snapshot History is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).

Returns time-series snapshot history of The Standard Reserve on-chain vault state on Robinhood Chain, including basis, reserve assets, POL metrics, and expansion/contraction data.

## Facts

- Endpoint: GET https://api.onesource.io/standard/v1/vaults/history?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/the-standard-reserve-tsr-vault-snapshot-history-f5f13f36
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4jPllJ6b282EKFCJtUq0W

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability the-standard-reserve-tsr-vault-snapshot-history-f5f13f36
```

Example prompt: Pull the vault snapshot history for The Standard Reserve on Robinhood Chain for the last 24 hours — I want to see how the basis, POL, and gold reserve assets have changed over that period.

## When to prefer this

Choose this endpoint when you need time-series historical data on The Standard Reserve vault state on Robinhood Chain, including how basis, POL, reserve assets, and expansion/contraction metrics have evolved over a specified number of hours. Prefer this over a current-state snapshot endpoint when trend analysis, auditing, or historical comparison is needed.

## Known failure modes

- Invalid or missing 'hours' parameter (must be integer >= 1) returns a validation error
- Payment failure via x402 protocol results in 402 response blocking access
- No historical data available for the requested time window returns empty history array
- Robinhood Chain node lag may cause stale or delayed snapshot data
- Serving state may indicate degraded or offline protocol state

## How this service works

The Standard Reserve (TSR), an on-chain reserve protocol on Robinhood Chain. Vault snapshot history. Fields ending in _raw are 18-decimal integers as strings. Divide by 1e18 to get token amounts.

## Output

Returns a JSON object containing the current basis, an array of historical vault snapshots (each with timestamp, block number, basis, POL ETH raw, POL STD raw, gold reserve raw, expansion ETH raw, contraction ETH raw, buyback tick capacity ETH raw), plus metadata including network name, chain ID, lag blocks, as-of block, and serving state.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "hours": {
       "type": "integer",
       "minimum": 1
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "basis": {
       "type": "string"
      },
      "history": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "ts": {
          "type": "string"
         },
         "basis": {
          "type": "string"
         },
         "block": {
          "type": "integer"
         },
         "pol_eth_raw": {
          "type": [
           "string",
           "null"
          ]
         },
         "pol_std_raw": {
          "type": [
           "string",
           "null"
          ]
         },
         "reserve_assets": {
          "type": "object",
          "properties": {
           "gold_raw": {
            "type": [
             "string",
             "null"
            ]
           }
          }
         },
         "expansion_eth_raw": {
          "type": "string"
         },
         "contraction_eth_raw": {
          "type": "string"
         },
         "buyback_tick_capacity_eth_raw": {
          "type": "string"
         }
        }
       }
      },
      "network": {
       "type": "string"
      },
      "chain_id": {
       "type": "integer"
      },
      "lag_blocks": {
       "type": "integer"
      },
      "as_of_block": {
       "type": "integer"
      },
      "serving_state": {
       "type": "string"
      }
     },
     "description": "Endpoint-specific response payload"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "basis": "vault_history",
  "history": [
   {
    "ts": "2026-09-14T12:00:00Z",
    "basis": "measured",
    "block": 63400000,
    "pol_eth_raw": null,
    "pol_std_raw": null,
    "reserve_assets": {
     "gold_raw": null
    },
    "expansion_eth_raw": "18000000000000000000",
    "contraction_eth_raw": "9000000000000000000",
    "buyback_tick_capacity_eth_raw": "500000000000000000"
   }
  ],
  "network": "robinhood",
  "chain_id": 4663,
  "lag_blocks": 5,
  "as_of_block": 63499000,
  "serving_state": "fresh"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/the-standard-reserve-tsr-vault-snapshot-history-f5f13f36/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.onesource.io](https://www.zero.xyz/host/api.onesource.io/llms.txt)