presign-guard

Wallet approval audit ($0.02 via x402)

wallet_approvals

Read-only

Paid ($0.02 USDC via x402 on Base or Solana): audit the open token approvals of a wallet on an EVM chain (base, ethereum, arbitrum, optimism, polygon, bsc) or on Solana, for example your agent's own wallet as a periodic check. Get back green/orange/red, a grade, a one-line summary and every approval with its spender. EVM, every ERC-20 allowance: flagged malicious (red), a plain wallet, on a doubt list, an unverified contract or an unlimited allowance to a spender not on the GoPlus trust list (orange), with a revoke.cash link. Solana, every SPL token delegation (Approve): a delegate on the OFAC SDN list (red), a delegate that is a plain wallet or an unlimited delegation (orange), with the token account to revoke on; Token-2022 tokens with a permanent delegate are listed too. NFT approvals are not covered. Same as GET /v1/approvals. 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	Default
`chain`	Yes	Chain to audit: an EVM chain (ERC-20 allowances) or solana (SPL token delegations)
`address`	Yes	Wallet address (0x... on EVM, base58 on Solana)

Output Schema

TableJSON Schema

Name	Required	Description
`grade`	No	SAFE, CAUTION, RISKY or AVOID
`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
`approvals`	No	Every open ERC-20 allowance (EVM) or SPL token delegation (Solana) with its spender
`one_liner`	No	One-line summary
`revokeUrl`	No	revoke.cash link for this wallet (EVM; null on Solana)

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 15, 2026

changedInput schema / properties / address / description

Previous value: -"Wallet address (0x...)"New value: +"Wallet address (0x... on EVM, base58 on Solana)"

changedInput schema / properties / chain / description

Previous value: -"EVM chain to audit"New value: +"Chain to audit: an EVM chain (ERC-20 allowances) or solana (SPL token delegations)"

changedInput schema / properties / chain / enum

Previous value: -[
-  "base",
-  "ethereum",
-  "arbitrum",
-  "optimism",
-  "polygon",
-  "bsc"
-]New value: +[
+  "base",
+  "ethereum",
+  "arbitrum",
+  "optimism",
+  "polygon",
+  "bsc",
+  "solana"
+]

changedOutput schema / properties / approvals / description

Previous value: -"Every open ERC-20 allowance with its spender"New value: +"Every open ERC-20 allowance (EVM) or SPL token delegation (Solana) with its spender"

changedOutput schema / properties / revokeUrl / description

Previous value: -"revoke.cash link for this wallet"New value: +"revoke.cash link for this wallet (EVM; null on Solana)"

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"
+  }
+]

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"
+    },
+    "approvals": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Every open ERC-20 allowance with its spender"
+    },
+    "grade": {
+      "description": "SAFE, CAUTION, RISKY or AVOID",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "one_liner": {
+      "description": "One-line summary",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "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"
+    },
+    "revokeUrl": {
+      "description": "revoke.cash link for this wallet",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "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"
+}

AddedSep 26, 2026

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