FreeTier Agent API

ERC-20 Token Risk Check

token_risk

Read-only

3 free MCP calls per day (all tools together), then $0.005 USDC via x402 or card credits (paid in-band: params._meta["x402/payment"]). Token risk: Deterministic ERC-20 risk check on Base or Ethereum from public on-chain data only: privileged functions in bytecode (mint, blacklist, pause, fees, limits, trading switch), upgradeable proxy + implementation, owner and renounce status, Uniswap v2/v3 + Aerodrome liquidity in USD (Chainlink), owner/pool/burned supply share. Every flag has evidence; lists what was NOT checked (no honeypot simulation). Not financial advice. When to use: Use token-risk before an agent buys, lists or recommends an ERC-20 token. It reads public chain data only: it does not simulate buys/sells (no honeypot test) and does not return price history or market data.

Input Schema

Name	Required	Description	Default
`chain`	No
`address`	Yes	token contract address 0x...

Output Schema

Name	Required	Description	Default
`rpc`	No
`name`	No
`chain`	No
`flags`	No
`owner`	No
`proxy`	No
`method`	No
`symbol`	No
`address`	No
`sources`	No
`verdict`	No
`decimals`	No
`liquidity`	No
`riskScore`	No
`disclaimer`	No
`isContract`	No
`notChecked`	No
`totalSupply`	No
`scoreMeaning`	No
`checkedAtBlock`	No
`ownerRenounced`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 26, 2026

changedOutput schema / description

Previous value: -"Inferred from a real response captured on 2026-10-24; extra fields may appear, null-valued fields are untyped."New value: +"Inferred from a real response captured on 2026-10-26; extra fields may appear, null-valued fields are untyped."

Changed1 schema field changedOct 24, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "description": "Inferred from a real response captured on 2026-10-24; extra fields may appear, null-valued fields are untyped.",
+  "properties": {
+    "address": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "chain": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "checkedAtBlock": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "decimals": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "disclaimer": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "flags": {
+      "items": {
+        "properties": {
+          "evidence": {
+            "properties": {
+              "owner": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "selectors": {
+                "type": [
+                  "array",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "key": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "label": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "severity": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "isContract": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "liquidity": {
+      "properties": {
+        "approxLiquidityUsd": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "burnedPct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "ethUsd": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "ownerSharePct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "poolSharePct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "pools": {
+          "items": {
+            "properties": {
+              "dex": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "pool": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "quote": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "quoteBalance": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "quoteSideUsd": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "tokenBalance": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "type": "object"
+    },
+    "method": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "name": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "notChecked": {
+      "items": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "type": "array"
+    },
+    "owner": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "ownerRenounced": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "proxy": {},
+    "riskScore": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "rpc": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "scoreMeaning": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "sources": {
+      "items": {
+        "properties": {
+          "name": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "url": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "symbol": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "totalSupply": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "verdict": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

AddedOct 24, 2026

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only say readOnlyHint/openWorldHint; the description adds the rate limit (3 free calls/day across all tools), the exact price and payment mechanism including the in-band params._meta["x402/payment"] field, the evidence-per-flag guarantee, and an explicit list of what was NOT checked. That is substantial context an agent cannot get from structured fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Dense but every clause carries information: scope, evidence guarantee, exclusions, pricing. Minor weakness is that the billing/payment sentence leads the description ahead of the tool's actual purpose, and the nested parentheticals make the opening harder to scan.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists so return shape need not be described, and the description covers everything else a caller needs: supported chains, data sources, evidence policy, known limitations, cost, and payment channel. Nothing material is missing for correct invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 50%: address is documented, chain is an undescribed enum. The description compensates by naming the supported chains ("Base or Ethereum") and by documenting the undocumented payment parameter, which is otherwise invisible to the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ("Deterministic ERC-20 risk check on Base or Ethereum") and then enumerates exactly what is examined: privileged bytecode functions, proxy/implementation, owner and renounce status, liquidity in USD, supply shares. This is far more specific than sibling names like rug_check or token_score and lets an agent distinguish it without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicit "When to use: before an agent buys, lists or recommends an ERC-20 token" plus clear exclusions (no honeypot simulation, no price history or market data). It does not, however, route the agent to or away from the obvious siblings (rug_check, token_score, token_info, token_compare), so the boundary with near-duplicate tools is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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