Agent Margin Router

Transaction Status

tx_status

Read-only

Status of any EVM transaction on Base, Ethereum, BSC, Polygon, Arbitrum or Optimism: success/failed/pending, block number, confirmations, gas used, effective gas price, fee, from/to/value and all ERC-20 Transfer events decoded from the receipt logs (contract, symbol, decimals, amount). Public JSON-RPC nodes with fallback. Pay per call with USDC or USDT on Base via x402. 3 free calls per wallet.

Input Schema

TableJSON Schema

Name	Required	Description
`chain`	No	base (default), ethereum, bsc, polygon, arbitrum, optimism.
`wallet`	No	Your EVM wallet address (0x...). Unlocks the free tier (3 free calls per wallet).
`api_key`	No	Optional AMR enterprise API key.
`tx_hash`	Yes	Transaction hash (0x + 64 hex).
`x_payment`	No	Optional signed x402 payment payload (base64 JSON) for USDC/USDT on Base.
`max_age_seconds`	No	Accept cached result up to N seconds old (default 0).

Output Schema

TableJSON Schema

Name	Required	Description	Default
`chain`	Yes
`nonce`	Yes
`token`	No	Token actually used for payment (USDC, USDT or FREE).	USDC
`value`	Yes
`status`	Yes
`routing`	Yes	How the request was routed (provider, fallback, cache, latency).
`tx_hash`	Yes
`chain_id`	Yes
`gas_used`	No
`cost_usdc`	Yes	Price charged in stablecoin units (USDC/USDT 1:1); 0 on the free tier.
`log_count`	Yes
`transfers`	Yes
`value_wei`	Yes
`fee_native`	No
`fetched_at`	No	UTC timestamp when the data was fetched.
`to_address`	No
`block_number`	No
`from_address`	Yes
`native_token`	Yes
`confirmations`	Yes
`gas_price_wei`	No
`gas_price_gwei`	No
`input_selector`	No
`contract_created`	No
`freshness_seconds`	Yes	Age of the underlying data in seconds (0 = fetched live).
`x_payment_response`	No	Base64-encoded x402 settlement receipt (mirrors the X-PAYMENT-RESPONSE header). Only present when the call was paid with `x_payment`.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 15, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "description": "Response for ``POST /tx-status``.",
+  "properties": {
+    "block_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Block Number"
+    },
+    "chain": {
+      "title": "Chain",
+      "type": "string"
+    },
+    "chain_id": {
+      "title": "Chain Id",
+      "type": "integer"
+    },
+    "confirmations": {
+      "title": "Confirmations",
+      "type": "integer"
+    },
+    "contract_created": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Contract Created"
+    },
+    "cost_usdc": {
+      "description": "Price charged in stablecoin units (USDC/USDT 1:1); 0 on the free tier.",
+      "title": "Cost Usdc",
+      "type": "number"
+    },
+    "fee_native": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Fee Native"
+    },
+    "fetched_at": {
+      "description": "UTC timestamp when the data was fetched.",
+      "format": "date-time",
+      "title": "Fetched At",
+      "type": "string"
+    },
+    "freshness_seconds": {
+      "description": "Age of the underlying data in seconds (0 = fetched live).",
+      "title": "Freshness Seconds",
+      "type": "integer"
+    },
+    "from_address": {
+      "title": "From Address",
+      "type": "string"
+    },
+    "gas_price_gwei": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Gas Price Gwei"
+    },
+    "gas_price_wei": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Gas Price Wei"
+    },
+    "gas_used": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Gas Used"
+    },
+    "input_selector": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Input Selector"
+    },
+    "log_count": {
+      "title": "Log Count",
+      "type": "integer"
+    },
+    "native_token": {
+      "title": "Native Token",
+      "type": "string"
+    },
+    "nonce": {
+      "title": "Nonce",
+      "type": "integer"
+    },
+    "routing": {
+      "description": "How the request was routed (provider, fallback, cache, latency).",
+      "properties": {
+        "cache_hit": {
+          "default": false,
+          "description": "True if the result was served from cache.",
+          "title": "Cache Hit",
+          "type": "boolean"
+        },
+        "fallback_used": {
+          "default": false,
+          "description": "True if the primary provider failed and a fallback served the result.",
+          "title": "Fallback Used",
+          "type": "boolean"
+        },
+        "latency_ms": {
+          "default": 0,
+          "description": "End-to-end routing latency in milliseconds.",
+          "title": "Latency Ms",
+          "type": "integer"
+        },
+        "provider": {
+          "description": "Name of the upstream provider that served the result.",
+          "title": "Provider",
+          "type": "string"
+        },
+        "providers_tried": {
+          "description": "Providers attempted, in order.",
+          "items": {
+            "type": "string"
+          },
+          "title": "Providers Tried",
+          "type": "array"
+        }
+      },
+      "required": [
+        "provider"
+      ],
+      "title": "RoutingMeta",
+      "type": "object"
+    },
+    "status": {
+      "enum": [
+        "success",
+        "failed",
+        "pending"
+      ],
+      "title": "Status",
+      "type": "string"
+    },
+    "to_address": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "To Address"
+    },
+    "token": {
+      "default": "USDC",
+      "description": "Token actually used for payment (USDC, USDT or FREE).",
+      "title": "Token",
+      "type": "string"
+    },
+    "transfers": {
+      "items": {
+        "description": "Decoded ERC-20 ``Transfer`` event.",
+        "properties": {
+          "amount": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null,
+            "title": "Amount"
+          },
+          "contract": {
+            "title": "Contract",
+            "type": "string"
+          },
+          "decimals": {
+            "anyOf": [
+              {
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null,
+            "title": "Decimals"
+          },
+          "from_address": {
+            "title": "From Address",
+            "type": "string"
+          },
+          "log_index": {
+            "title": "Log Index",
+            "type": "integer"
+          },
+          "raw": {
+            "title": "Raw",
+            "type": "string"
+          },
+          "symbol": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null,
+            "title": "Symbol"
+          },
+          "to_address": {
+            "title": "To Address",
+            "type": "string"
+          }
+        },
+        "required": [
+          "contract",
+          "from_address",
+          "to_address",
+          "raw",
+          "log_index"
+        ],
+        "title": "Erc20Transfer",
+        "type": "object"
+      },
+      "title": "Transfers",
+      "type": "array"
+    },
+    "tx_hash": {
+      "title": "Tx Hash",
+      "type": "string"
+    },
+    "value": {
+      "title": "Value",
+      "type": "number"
+    },
+    "value_wei": {
+      "title": "Value Wei",
+      "type": "string"
+    },
+    "x_payment_response": {
+      "description": "Base64-encoded x402 settlement receipt (mirrors the X-PAYMENT-RESPONSE header). Only present when the call was paid with `x_payment`.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "freshness_seconds",
+    "cost_usdc",
+    "routing",
+    "tx_hash",
+    "chain",
+    "chain_id",
+    "status",
+    "confirmations",
+    "from_address",
+    "value_wei",
+    "value",
+    "native_token",
+    "nonce",
+    "transfers",
+    "log_count"
+  ],
+  "type": "object"
+}

Changed2 schema fields changedSep 13, 2026

addedInput schema / properties / max_age_seconds / default
```
Added value: +0
```

changedInput schema / properties / wallet / description

Previous value: -"Your EVM wallet address (0x...). Unlocks the free tier (3 calls per wallet)."New value: +"Your EVM wallet address (0x...). Unlocks the free tier (3 free calls per wallet)."

AddedSep 13, 2026

TDQS

A4.3/5.0

Behavior4/5

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

With annotations already declaring readOnlyHint and openWorldHint, the description adds valuable context about reliance on public JSON-RPC nodes with fallback, per-call payment via USDC/USDT on Base, and the 3-free-calls wallet tier. This covers cost and infrastructure behavior beyond the annotations.

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

Conciseness5/5

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

The description is compact and front-loaded: it starts with the action, resource, and supported chains, then gives a thorough but efficient list of status fields, followed by infrastructure and payment details. Every sentence carries useful information and there is no filler.

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?

Given the output schema exists and annotations cover the read-only network-open nature, the description communicates the supported chains, what the status includes, decode events, reliance on public nodes, and payment/free-tier behavior. An agent can confidently decide to invoke this tool and understands the expected cost and return richness.

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

Parameters3/5

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

Schema description coverage is 100%, and the parameter descriptions already explain tx_hash, chain, wallet, api_key, x_payment, and max_age_seconds. The tool description provides supporting context about payment and free-tier limits but does not add meaningful parameter-level semantics beyond what the schema already provides.

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?

The description states a specific verb and resource: it reports the status of any EVM transaction across six named chains, including detailed fields such as confirmations, gas used, fees, and decoded ERC-20 transfers. It clearly differentiates itself from sibling tools like wallet_balance, gas_fees, and contract_info by focusing on transaction-level status and receipts.

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?

The description makes the intended use clear: check whether an EVM transaction is success/failed/pending and retrieve receipt-derived data. It includes supported networks and payment/free-tier behavior, but it does not explicitly state when not to use this tool relative to siblings such as gas_fees or wallet_balance.

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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