Meridian

{
  "name": "Meridian",
  "description": "Pre-sign checks for agents: call Meridian before you sign. mio_dio_defi_risk_passport: a read-only x402 pay-per-call HTTP API. Public on-chain Aave, Lido, ERC-4626 vault, OFAC SDN exact-match, parameter-drift, and transaction-simulation cards. Never holds keys, does not sign, and does not move funds. Not an A2A JSON-RPC task server.",
  "version": "0.8.0",
  "documentationUrl": "https://meridian.miodiollc.com/docs",
  "provider": {
    "organization": "MioDio LLC",
    "url": "https://meridian.miodiollc.com"
  },
  "supportedInterfaces": [
    {
      "url": "https://meridian.miodiollc.com",
      "protocolBinding": "HTTP+JSON",
      "protocolVersion": "1.0"
    }
  ],
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "extendedAgentCard": false,
    "extensions": [
      {
        "uri": "https://meridian.miodiollc.com/.well-known/x402",
        "description": "x402 v2 resource-server catalog (atomic prices, Base USDC, payTo).",
        "required": false
      },
      {
        "uri": "https://meridian.miodiollc.com/openapi.json",
        "description": "OpenAPI 3.1 for paid and free routes.",
        "required": false
      },
      {
        "uri": "https://meridian.miodiollc.com/llms.txt",
        "description": "Plain-text summary for LLM agents.",
        "required": false
      },
      {
        "uri": "https://meridian.miodiollc.com/.well-known/meridian-receipt-keys.json",
        "description": "Ed25519 public keys for verifying Meridian-Receipt headers.",
        "required": false
      },
      {
        "uri": "https://meridian.miodiollc.com/docs",
        "description": "Human-readable HTML docs.",
        "required": false
      },
      {
        "uri": "https://meridian.miodiollc.com/v1/demo/drift",
        "description": "Free parameter-drift demo card (GET /v1/demo/drift).",
        "required": false
      },
      {
        "uri": "https://meridian.miodiollc.com/v1/demo/simulate",
        "description": "Free transaction-simulation demo card (GET /v1/demo/simulate).",
        "required": false
      }
    ]
  },
  "defaultInputModes": [
    "application/json"
  ],
  "defaultOutputModes": [
    "application/json"
  ],
  "skills": [
    {
      "id": "risk_passport",
      "name": "Aave v3 risk card",
      "tags": [
        "defi",
        "risk",
        "aave",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian Aave v3 risk card for an EVM address: health factor, collateral, debt and liquidation distance (~$0.005 USDC Exact on Base). Errors: 400 invalid_address or unsupported_chain (chain must be base or ethereum), 402 payment required, failed upstream reads return 200 with status partial/error (unexpected 5xx is not charged). MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "GET /v1/risk/0x0000000000000000000000000000000000000001"
      ]
    },
    {
      "id": "lido_exit_risk",
      "name": "Lido exit-risk card",
      "tags": [
        "defi",
        "lido",
        "lst",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian Lido exit-risk card: stETH/ETH Curve peg, withdrawal-queue ETA and exit liquidity for a stETH amount (~$0.005 USDC Exact on Base). Errors: 400 amount_required or invalid_amount, 402 payment required, failed upstream reads return 200 with status partial/error (unexpected 5xx is not charged). MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "GET /v1/lido/exit-risk?amount=32"
      ]
    },
    {
      "id": "vault_risk",
      "name": "ERC-4626 vault risk card",
      "tags": [
        "defi",
        "erc4626",
        "vault",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian ERC-4626 vault risk card: share price, drawdown, APY lookback and idle cash for one vault (~$0.005 USDC Exact on Base). Errors: 400 invalid_address, unsupported_chain or invalid_amount, 402 payment required, failed upstream reads return 200 with status partial/error (unexpected 5xx is not charged). MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "GET /v1/vault/0xc1256Ae5FF1cf2719D4937adb3bbCCab2E00A2Ca"
      ]
    },
    {
      "id": "deep_passport",
      "name": "Deep passport",
      "tags": [
        "defi",
        "risk",
        "passport",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian deep passport: one decision card joining Aave v3, Lido exit and optional ERC-4626 vault reads for an EVM address (~$0.02 USDC Exact on Base). Errors: 400 invalid_address, unsupported_chain or invalid_amount, 402 payment required, failed upstream reads return 200 with status partial/error (unexpected 5xx is not charged). MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "GET /v1/passport/0x0000000000000000000000000000000000000001"
      ]
    },
    {
      "id": "sanctions_screen",
      "name": "OFAC SDN screen",
      "tags": [
        "ofac",
        "sdn",
        "sanctions",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian OFAC SDN screen: exact match of one digital-currency address against public SDN Digital Currency Address entries (~$0.005 USDC Exact on Base). Informational only. Errors: 400 invalid_address or unsupported_chain, 402 payment required, unexpected 5xx is not charged. MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "GET /v1/sanctions/0x0000000000000000000000000000000000000001"
      ]
    },
    {
      "id": "passport_sanctions",
      "name": "Passport + SDN bundle",
      "tags": [
        "ofac",
        "sdn",
        "passport",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian bundle: deep passport plus OFAC SDN exact-match screen for one EVM address (~$0.02 USDC Exact on Base). Informational only. Errors: 400 invalid_address, unsupported_chain or invalid_amount, 402 payment required, failed upstream reads return 200 with status partial/error (unexpected 5xx is not charged). MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "GET /v1/passport-sanctions/0x0000000000000000000000000000000000000001"
      ]
    },
    {
      "id": "sanctions_batch",
      "name": "OFAC SDN batch screen",
      "tags": [
        "ofac",
        "sdn",
        "batch",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian OFAC SDN batch screen: exact match of 1-50 digital-currency addresses against public SDN Digital Currency Address entries (~$0.10 USDC Exact on Base). Informational only. Errors: 400 invalid_body, invalid_address or unsupported_chain, 402 payment required, unexpected 5xx is not charged. MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "POST /v1/sanctions/batch"
      ]
    },
    {
      "id": "parameter_drift",
      "name": "Parameter-drift check",
      "tags": [
        "defi",
        "tx",
        "drift",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian parameter-drift check: diffs a declared intent against the exact unsigned tx or EIP-712 payload (~$0.005 USDC Exact on Base). Verdict match, drift or cannot_verify. Unknown calldata is cannot_verify, never match. A match is not a guarantee. Errors: 400 invalid_body or unsupported_chain, 402 payment required. MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "POST /v1/drift"
      ]
    },
    {
      "id": "transaction_simulate",
      "name": "Transaction simulation",
      "tags": [
        "defi",
        "tx",
        "simulate",
        "x402"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian transaction simulation: dry-run of an unsigned tx against latest Base/Ethereum state (~$0.01 USDC Exact on Base). Returns success or revert, gas, balances, approvals and warnings. A simulation is a point-in-time dry run, not a guarantee. Never signs or moves funds. Errors: 400 invalid_body or unsupported_chain, 402 payment required. MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "POST /v1/simulate"
      ]
    },
    {
      "id": "payment_check",
      "name": "USDC payment check",
      "tags": [
        "defi",
        "x402",
        "payment"
      ],
      "description": "Pre-sign check: agents call Meridian before they sign. MioDio Meridian payment-check: on-chain read of a Base USDC Exact authorization or Transfer (~$0.005 USDC Exact). Reports nonce used, matching transfers in a \u2264120 minute window, and confirmations. Informational. 503 and not settled if every read fails. Never signs or moves funds. Errors: 400 invalid_body, 402 payment required, 503 upstream_unavailable. MioDio x402 DeFi. Terms: https://meridian.miodiollc.com/terms",
      "examples": [
        "POST /v1/payment-check"
      ]
    }
  ]
}