presign-guard

Pre-sign risk check with explanation ($0.03 via x402)

presign_check_explain

Read-only

Paid ($0.03 USDC via x402 on Base or Solana): the same verdict and reason codes as presign_check, plus a 3 to 5 sentence plain-language explanation a person can read before approving (lang en or nl). Same as POST /v1/check/explain. The answer carries a signed receipt (EIP-191, bound to your arguments) that proves later which verdict you got.

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)
`lang`	No	Language of the explanation (default en)
`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
`accepts`	No	Only on an unpaid call: the x402 payment options
`reasons`	No	Why the verdict is what it is
`receipt`	No	Signed receipt (EIP-191) binding the verdict to your arguments
`verdict`	No	green: go ahead; orange: ask the user; red: do not sign or buy (absent on the payment requirement)
`version`	No
`explanation`	No	Plain-language explanation for a person

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 12, 2026

changedOutput schema / properties / reasons / anyOf

Previous value: -[
-  {
-    "description": "Why the verdict is what it is",
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "code": {
-          "description": "Reason code, e.g. SPENDER_FLAGGED, UNLIMITED_ALLOWANCE, TOKEN_HONEYPOT",
-          "type": "string"
-        },
-        "severity": {
-          "description": "info, warn or critical",
-          "type": "string"
-        },
-        "subject": {
-          "description": "The address or item the reason is about",
-          "type": "string"
-        }
-      },
-      "required": [
-        "code"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "Why the verdict is what it is",
+    "items": {
+      "additionalProperties": true,
+      "properties": {
+        "code": {
+          "description": "Reason code, e.g. SPENDER_FLAGGED, UNLIMITED_ALLOWANCE, TOKEN_HONEYPOT",
+          "type": "string"
+        },
+        "severity": {
+          "description": "info, warn or critical",
+          "type": "string"
+        },
+        "subject": {
+          "description": "The address or item the reason is about (null or absent when it is about the whole request)",
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "required": [
+        "code"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

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": {
+    "accepts": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Only on an unpaid call: the x402 payment options"
+    },
+    "explanation": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "lang": {
+              "type": "string"
+            },
+            "text": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "lang",
+            "text"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Plain-language explanation for a person"
+    },
+    "reasons": {
+      "anyOf": [
+        {
+          "description": "Why the verdict is what it is",
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "code": {
+                "description": "Reason code, e.g. SPENDER_FLAGGED, UNLIMITED_ALLOWANCE, TOKEN_HONEYPOT",
+                "type": "string"
+              },
+              "severity": {
+                "description": "info, warn or critical",
+                "type": "string"
+              },
+              "subject": {
+                "description": "The address or item the reason is about",
+                "type": "string"
+              }
+            },
+            "required": [
+              "code"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Why the verdict is what it is"
+    },
+    "receipt": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "description": "Signed receipt (EIP-191) binding the verdict to your arguments",
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Signed receipt (EIP-191) binding the verdict to your arguments"
+    },
+    "verdict": {
+      "anyOf": [
+        {
+          "description": "green: go ahead; orange: ask the user; red: do not sign or buy",
+          "enum": [
+            "green",
+            "orange",
+            "red"
+          ],
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "green: go ahead; orange: ask the user; red: do not sign or buy (absent on the payment requirement)"
+    },
+    "version": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "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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Pre-sign risk check with explanation ($0.03 via x402)

Input Schema

Output Schema

Schema Changelog

TDQS

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