presign-guard

Quick pre-sign verdict (free)

presign_quick_check

Read-only

Free: the green/orange/red verdict only, for a transaction, token approval, EIP-712 signature, XRP Ledger transaction (type xrpl) or Algorand transaction (type algorand) your agent is about to sign. Limited to 10 calls per hour. For the reason codes and details use presign_check ($0.01); for a plain-language explanation presign_check_explain ($0.03).

Input Schema

TableJSON Schema

Name	Required	Description
`to`	No	transaction: the target contract
`tx`	No	xrpl: the unsigned transaction JSON (TransactionType, Account, Destination, Amount, …)
`data`	No	transaction: 0x-prefixed calldata
`from`	No	transaction or message, optional: your wallet address; the transaction is then simulated (what really leaves and arrives; orange HIDDEN_APPROVAL, SIMULATION_NFT_OUT, SIMULATION_FAILS) and its recipients are compared with who this wallet paid before (red ADDRESS_POISONING for a look-alike)
`type`	Yes	What the agent is about to sign; message = a plain personal_sign / eth_sign message in message; solana = a Solana transaction in transaction; xrpl = an unsigned XRP Ledger transaction in tx; algorand = an Algorand transaction in transaction, or a group in transactions
`x402`	No	optional, EIP-3009 payments only: the x402 payment requirements you are paying ({ accepted: { scheme, network, amount, asset, payTo, maxTimeoutSeconds, extra } }, one entry of the 402's accepts); red when the signature pays more, someone else, another token or chain
`token`	No	approval: the token contract
`value`	No	transaction: native value in wei
`amount`	No	approval: amount in base units (0 = revoke)
`intent`	No	optional: what you are trying to do, in one sentence (e.g. "swap 10 USDC for ETH on Uniswap"); orange INTENT_MISMATCH when signing would do more or something else
`method`	No	message: how it is signed (default personal_sign); eth_sign is always red
`origin`	No	optional: the site asking for the signature or transaction (URL or hostname); a domain under 30 days old is orange
`chainId`	No	EVM chain id, required for approval, transaction and signature: 1, 10, 56, 137, 8453, 42161 (8453 = Base); optional for message
`message`	No	message: the text or 0x-hex about to be signed; a Sign-In with Ethereum message for another site than origin is red, unreadable bytes are orange
`network`	No	xrpl: xrpl:0 (mainnet, default) or xrpl:1 (testnet)
`spender`	No	approval: who gets the allowance
`typedData`	No	signature: the exact eth_signTypedData_v4 payload (Permit, Permit2, EIP-3009 x402 payment, Seaport)
`transaction`	No	solana: the base64 wire transaction about to be signed; decoded and simulated (red SOLANA_TOKEN_ACCOUNT_TAKEOVER, SOLANA_ACCOUNT_ASSIGN; orange SOLANA_UNLIMITED_DELEGATE, SOLANA_DURABLE_NONCE, HIDDEN_APPROVAL, SIMULATION_FAILS). algorand: one base64 msgpack transaction (unsigned or signed); red ALGORAND_REKEY, ALGORAND_CLOSE_ACCOUNT, ALGORAND_ASSET_CLOSE, ALGORAND_FAKE_STABLECOIN; simulated
`transactions`	No	algorand: an atomic group, each a base64 msgpack transaction; send the whole group so every transaction is checked

Output Schema

TableJSON Schema

Name	Required	Description	Default
`note`	No
`verdict`	Yes	green: go ahead; orange: ask the user; red: do not sign or buy

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 11, 2026

changedInput schema / properties / transaction / description

Previous value: -"solana: the base64 wire transaction about to be signed; decoded and simulated (red SOLANA_TOKEN_ACCOUNT_TAKEOVER, SOLANA_ACCOUNT_ASSIGN; orange SOLANA_UNLIMITED_DELEGATE, SOLANA_DURABLE_NONCE, HIDDEN_APPROVAL, SIMULATION_FAILS)"New value: +"solana: the base64 wire transaction about to be signed; decoded and simulated (red SOLANA_TOKEN_ACCOUNT_TAKEOVER, SOLANA_ACCOUNT_ASSIGN; orange SOLANA_UNLIMITED_DELEGATE, SOLANA_DURABLE_NONCE, HIDDEN_APPROVAL, SIMULATION_FAILS). algorand: one base64 msgpack transaction (unsigned or signed); red ALGORAND_REKEY, ALGORAND_CLOSE_ACCOUNT, ALGORAND_ASSET_CLOSE, ALGORAND_FAKE_STABLECOIN; simulated"

changedInput schema / properties / transaction / maxLength
```
Previous value: -2400New value: +12000
```

addedInput schema / properties / transactions

Added value: +{
+  "description": "algorand: an atomic group, each a base64 msgpack transaction; send the whole group so every transaction is checked",
+  "items": {
+    "maxLength": 12000,
+    "type": "string"
+  },
+  "maxItems": 16,
+  "type": "array"
+}

changedInput schema / properties / type / description

Previous value: -"What the agent is about to sign; message = a plain personal_sign / eth_sign message in message; solana = a Solana transaction in transaction; xrpl = an unsigned XRP Ledger transaction in tx"New value: +"What the agent is about to sign; message = a plain personal_sign / eth_sign message in message; solana = a Solana transaction in transaction; xrpl = an unsigned XRP Ledger transaction in tx; algorand = an Algorand transaction in transaction, or a group in transactions"

changedInput schema / properties / type / enum

Previous value: -[
-  "approval",
-  "transaction",
-  "signature",
-  "message",
-  "solana",
-  "xrpl"
-]New value: +[
+  "approval",
+  "transaction",
+  "signature",
+  "message",
+  "solana",
+  "xrpl",
+  "algorand"
+]

Changed7 schema fields changedOct 11, 2026

changedInput schema / properties / chainId / description

Previous value: -"EVM chain id, required for approval, transaction and signature: 1, 10, 56, 137, 8453, 42161 (8453 = Base)"New value: +"EVM chain id, required for approval, transaction and signature: 1, 10, 56, 137, 8453, 42161 (8453 = Base); optional for message"

changedInput schema / properties / from / description

Previous value: -"transaction, optional: your wallet address; the transaction is then simulated (what really leaves and arrives; orange HIDDEN_APPROVAL, SIMULATION_NFT_OUT, SIMULATION_FAILS)"New value: +"transaction or message, optional: your wallet address; the transaction is then simulated (what really leaves and arrives; orange HIDDEN_APPROVAL, SIMULATION_NFT_OUT, SIMULATION_FAILS) and its recipients are compared with who this wallet paid before (red ADDRESS_POISONING for a look-alike)"

addedInput schema / properties / message

Added value: +{
+  "description": "message: the text or 0x-hex about to be signed; a Sign-In with Ethereum message for another site than origin is red, unreadable bytes are orange",
+  "maxLength": 16384,
+  "type": "string"
+}

addedInput schema / properties / method

Added value: +{
+  "description": "message: how it is signed (default personal_sign); eth_sign is always red",
+  "enum": [
+    "personal_sign",
+    "eth_sign"
+  ],
+  "type": "string"
+}

addedInput schema / properties / transaction

Added value: +{
+  "description": "solana: the base64 wire transaction about to be signed; decoded and simulated (red SOLANA_TOKEN_ACCOUNT_TAKEOVER, SOLANA_ACCOUNT_ASSIGN; orange SOLANA_UNLIMITED_DELEGATE, SOLANA_DURABLE_NONCE, HIDDEN_APPROVAL, SIMULATION_FAILS)",
+  "maxLength": 2400,
+  "type": "string"
+}

changedInput schema / properties / type / description

Previous value: -"What the agent is about to sign; xrpl = an unsigned XRP Ledger transaction in tx"New value: +"What the agent is about to sign; message = a plain personal_sign / eth_sign message in message; solana = a Solana transaction in transaction; xrpl = an unsigned XRP Ledger transaction in tx"

changedInput schema / properties / type / enum

Previous value: -[
-  "approval",
-  "transaction",
-  "signature",
-  "xrpl"
-]New value: +[
+  "approval",
+  "transaction",
+  "signature",
+  "message",
+  "solana",
+  "xrpl"
+]

Changed2 schema fields changedOct 10, 2026

addedInput schema / properties / from

Added value: +{
+  "description": "transaction, optional: your wallet address; the transaction is then simulated (what really leaves and arrives; orange HIDDEN_APPROVAL, SIMULATION_NFT_OUT, SIMULATION_FAILS)",
+  "type": "string"
+}

addedInput schema / properties / x402

Added value: +{
+  "additionalProperties": {},
+  "description": "optional, EIP-3009 payments only: the x402 payment requirements you are paying ({ accepted: { scheme, network, amount, asset, payTo, maxTimeoutSeconds, extra } }, one entry of the 402's accepts); red when the signature pays more, someone else, another token or chain",
+  "type": "object"
+}

Changed1 schema field changedOct 10, 2026

addedInput schema / properties / intent

Added value: +{
+  "description": "optional: what you are trying to do, in one sentence (e.g. \"swap 10 USDC for ETH on Uniswap\"); orange INTENT_MISMATCH when signing would do more or something else",
+  "maxLength": 500,
+  "type": "string"
+}

Changed1 schema field changedOct 9, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": true,
+  "properties": {
+    "note": {
+      "type": "string"
+    },
+    "verdict": {
+      "description": "green: go ahead; orange: ask the user; red: do not sign or buy",
+      "enum": [
+        "green",
+        "orange",
+        "red"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "verdict"
+  ],
+  "type": "object"
+}

Changed6 schema fields changedOct 7, 2026

changedInput schema / properties / chainId / description

Previous value: -"EVM chain id: 1, 10, 56, 137, 8453, 42161 (8453 = Base)"New value: +"EVM chain id, required for approval, transaction and signature: 1, 10, 56, 137, 8453, 42161 (8453 = Base)"

addedInput schema / properties / network

Added value: +{
+  "description": "xrpl: xrpl:0 (mainnet, default) or xrpl:1 (testnet)",
+  "enum": [
+    "xrpl:0",
+    "xrpl:1"
+  ],
+  "type": "string"
+}

addedInput schema / properties / tx

Added value: +{
+  "additionalProperties": {},
+  "description": "xrpl: the unsigned transaction JSON (TransactionType, Account, Destination, Amount, …)",
+  "type": "object"
+}

changedInput schema / properties / type / description

Previous value: -"What the agent is about to sign"New value: +"What the agent is about to sign; xrpl = an unsigned XRP Ledger transaction in tx"

changedInput schema / properties / type / enum

Previous value: -[
-  "approval",
-  "transaction",
-  "signature"
-]New value: +[
+  "approval",
+  "transaction",
+  "signature",
+  "xrpl"
+]

changedInput schema / required

Previous value: -[
-  "type",
-  "chainId"
-]New value: +[
+  "type"
+]

Changed1 schema field changedSep 25, 2026

addedInput schema / properties / origin

Added value: +{
+  "description": "optional: the site asking for the signature or transaction (URL or hostname); a domain under 30 days old is orange",
+  "type": "string"
+}

First observedSep 25, 2026

TDQS

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Quick pre-sign verdict (free)

Input Schema

Output Schema

Schema Changelog

TDQS

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