Is the share-price lookback a promise?

No. The `apy` object uses method share_price_lookback. It is a lookback estimate, not a promise.

What happens on RPC failure?

Charged HTTP 200 with status partial.

Docs / ERC-4626 vault risk card

How do I read ERC-4626 vault risk before my agent deposits or exits?

Meridian by MioDio gives back an ERC-4626 vault risk card: share price, drawdown, APY-style share-price lookback (not a promise), and idle cash, for $0.005 USDC on Base via x402. Positions are never invented.

Fields returned

Demo card includes:

vault_meta: name, symbol, asset, asset_symbol, asset_decimals, share_decimals
share_price: assets_per_share, lookback (d1/d7/d30), drawdown_bps
apy: window, estimate_pct, method (share_price_lookback)
liquidity: total_assets, idle_assets, idle_coverage_bps, amount, idle_covers_amount, note

Chain query

Query chain=base or chain=ethereum.

Call it (curl + free demo)

curl -s "https://meridian.miodiollc.com/v1/demo/vault"
curl -i "https://meridian.miodiollc.com/v1/vault/0xc1256Ae5FF1cf2719D4937adb3bbCCab2E00A2Ca?chain=base"

Unpaid -> HTTP 402 + PAYMENT-REQUIRED.

Price

$0.005 USDC on Base (~5000 atomic). Network eip155:8453. Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. payTo 0x4DA1ED782BD61BaE9AdD5a5CaBbCf32f767f8d7F.

Caveats on APY lookback

The apy field is a share-price lookback method, not a promise. Idle assets may understate withdrawable liquidity when the vault can unwind strategies. Always verify on-chain. Missing fields mean the read failed or was not attempted.

Response (demo, trimmed)

{
  "card": "vault_risk",
  "version": "0.9.0",
  "status": "partial",
  "chain": "base",
  "vault": "0xc1256Ae5FF1cf2719D4937adb3bbCCab2E00A2Ca",
  "share_price": {
    "assets_per_share": "0",
    "lookback": { "d1": null, "d7": null, "d30": null },
    "drawdown_bps": null
  },
  "apy": {
    "window": null,
    "estimate_pct": null,
    "method": "share_price_lookback"
  },
  "liquidity": {
    "total_assets": "0",
    "idle_assets": "0",
    "note": "idle_assets is the underlying token balance of the vault contract. Strategy-held assets may still be withdrawable."
  },
  "errors": ["erc4626 snapshot failed: unknown"]
}

What it does NOT do

Meridian by MioDio never holds keys, does not sign user transactions, and does not move funds.
Not financial, legal, or compliance advice. Screens, drift, and simulation are informational and point-in-time where that applies.
Not a substitute for a compliance program.
No MCP server and no SDK are available today.

Unpaid calls return HTTP 402 with PAYMENT-REQUIRED. Retry with PAYMENT-SIGNATURE.

FAQ

Is the share-price lookback a promise?: No. The `apy` object uses method share_price_lookback. It is a lookback estimate, not a promise.
What does idle cash mean?: idle_assets is the underlying token balance of the vault contract. Strategy-held assets may still be withdrawable.
What happens on RPC failure?: Charged HTTP 200 with status partial.