ScorpTech x402 Tools

Evm Logs

evm_logs

Read-onlyIdempotent

Decoded event logs for any contract and event on Ethereum, Base, Arbitrum, OP Mainnet, Polygon or BNB Chain: give the event as a human signature (e.g. "Transfer(address indexed from, address indexed to, uint256 value)"), optional indexed-topic filters, and get the newest matching logs with named, ABI-decoded arguments (exact integers as strings, checksummed addresses). Scans backwards from the head with an adaptive block window. Keyless public RPC. Price: $0.01 USDC per successful call (x402, Solana). Same tool over HTTPS: GET https://scorptech.it.com/api/x402/v1/evm-logs

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "address": "<address>",
      "event": "<event>"
    },
    "name": "evm_logs"
  }
}

Input Schema

Name	Required	Description
`chain`	No	eth (default), base, arbitrum, optimism, polygon or bsc (chain ids and common aliases accepted)
`event`	Yes	Event signature, e.g. "Swap(address indexed sender, uint256 amount0In, ...)". Mark indexed params; without "indexed" the first N params are assumed indexed from the topic count
`limit`	No	Max logs returned, newest first
`blocks`	No	Max blocks to scan back from toBlock
`topic1`	No	Filter on the 1st indexed param: address, uint (decimal) or 32-byte hex
`topic2`	No	Filter on the 2nd indexed param
`topic3`	No	Filter on the 3rd indexed param
`address`	Yes	Contract address emitting the event (0x, 20 bytes)
`toBlock`	No	Newest block to scan (default head)

Schema Changelog

Changes observed during successful MCP inspections.

AddedOct 23, 2026

TDQS

A4.3/5.0

Behavior5/5

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

Adds substantial context beyond the annotations: cost ($0.01 USDC per successful call via x402 on Solana), keyless public RPC, adaptive backward block-window scanning, and an HTTPS fallback endpoint. It also describes the return shape (ABI-decoded named args, integers as strings, checksummed addresses), which matters since no output schema exists. Nothing here contradicts readOnly/idempotent hints.

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?

Front-loaded with purpose and the key call pattern in the first sentence; the pricing and HTTPS line is genuinely useful. It is a long, comma-heavy run-on that could be tightened, but no sentence is filler.

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

Completeness4/5

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

Given a 9-parameter tool with no output schema, the description covers return formatting, chain coverage, scanning behavior, and payment. Minor gaps remain: behavior when no logs match, and whether the limit/blocks interplay can truncate results silently.

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%, so all nine parameters are already documented, including the indexed-param convention on 'event'. The description restates the signature format and topic filters but adds no syntax or edge-case detail (e.g., how topicN interacts with the indexed assumption) beyond 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 ('decoded event logs for any contract and event') plus the exact chain set and the decoded-output promise. It is implicitly distinguished from siblings like evm_read and evm_token_transfers because it fetches raw logs for an arbitrary event signature rather than token transfers or contract state.

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?

Explains the required invocation pattern (human-readable event signature, optional indexed-topic filters, scanning backwards from head) so an agent knows how to use it. It does not name alternatives such as evm_token_transfers or evm_read, nor state when this tool is the wrong choice.

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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