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Directory / BaseLens

BaseLens

Q: Is BaseLens MCP server safe?

QAmcp's test on 30 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 11 of its tools are labeled read-only. Overall it scored 95/100 on 30 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by baselens-api.vercel.app · https://baselens-api.vercel.app/mcp

Base on-chain data for agents: balances, prices, transfers, Basenames, contracts. x402 pay-per-call.

11 tools✓ all read-only✓ no account neededPricing: not listed

Visit website

95 /100

PASS · WITH NOTES

11 of 11 checks · 30 Oct 2026

Is BaseLens MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 11 of its tools are labeled read-only.
Overall it scored 95/100 on 30 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

11 tools, in the server's own words.

base_addressread-only

Base (chain 8453) address snapshot: EOA vs contract vs EIP-7702, ETH balance, nonce, code size and native USDC balance, at the latest block.

base_erc20_balanceread-only

ERC-20 balance of any address for any token on Base, with symbol and decimals already applied (raw and human-readable).

base_tokenread-only

Token facts on Base: name, symbol, decimals, total supply, contract code size, owner() and EIP-1967 proxy implementation, plus plain-language notes (upgradeabl…

base_txread-only

Human-readable summary of a Base transaction: status, block time, from/to, value, total fee (incl.

base_gasread-only

Current Base gas: base fee, gas price, suggested EIP-1559 max fee and priority fee (gwei), block fullness, and cost of a plain ETH transfer.

base_nameread-only

Resolve a Basename (name.base.eth) or ENS name to its Base/Ethereum address, or reverse-resolve an address to its primary ENS/Basename.

base_priceread-only

On-chain USDC price of any Base ERC-20: executable Uniswap v3 quote for 1 whole token (direct USDC pool or via WETH, best fee tier).

base_transfersread-only

Recent ERC-20 transfers in and out of an address on Base for up to 5 tokens (default USDC), newest first, over the last ~10k blocks (max 30k).

base_contractread-only

Contract check on Base: is it a contract, code size, owner(), proxy implementation, and whether the source (and implementation) is verified on Sourcify, plus p…

base_free_gas_sampleread-only

Free sample: latest Base block number and base fee (gwei).

base_catalogread-only

Lists every BaseLens tool with price, inputs and the equivalent x402 HTTP URL.

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Follows MCP best practices (not scored yet)
2 tips (not scored)
- !2 tools don't say whether they reach outside services like the web (openWorldHint): base_free_gas_sample, base_catalog
- !2 tools answer with structured data but don't declare its shape (outputSchema): base_free_gas_sample, base_catalog. If those answers change shape, nothing can catch it; with a schema, every answer is checked.
note
✓
ConnectsConnected in 476 ms
pass
✓
Lists its toolsFound 11 tools
pass
✓
Every tool is describedAll 11 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓base_address: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_address","description":"Base (chain 8453…
- ✓base_erc20_balance: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_erc20_balance","description":"ERC-20 bal…
- ✓base_token: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_token","description":"Token facts on Bas…
- ✓base_tx: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_tx","description":"Human-readable summar…
- ✓base_gas: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_gas","description":"Current Base gas: ba…
- ✓base_name: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_name","description":"Resolve a Basename …
- ✓base_price: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_price","description":"On-chain USDC pric…
- ✓base_contract: Answered with an error, probably because of our sample input: {"x402Version":2,"error":"Payment required to access this tool","resource":{"url":"mcp://tool/base_contract","description":"Contract check …
- and 3 more
pass
✓
Bad inputs give a clean error
All good
- ✓base_address: Refused missing required input "address" with a clear error
- ✓base_address: Refused wrong type for "address" with a clear error
- ✓base_erc20_balance: Refused missing required input "token" with a clear error
- ✓base_erc20_balance: Refused wrong type for "token" with a clear error
- ✓base_token: Refused missing required input "token" with a clear error
- ✓base_token: Refused wrong type for "token" with a clear error
- ✓base_tx: Refused missing required input "hash" with a clear error
- ✓base_tx: Refused wrong type for "hash" with a clear error
- and 5 more
pass
✓
Fast enough
All good
- ✓Connecting took 476 ms
- ✓Listing tools took 107 ms
- ✓Average tool answer: 109 ms
- ✓base_free_gas_sample: Slowest tool: base_free_gas_sample (251 ms)
pass
✓
No secrets leakedChecked 21 error messages: no secrets or internal details
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

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Score over time

30 Oct 202695

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use BaseLens, signed in with GitHub, one per person. Reviews never change the score.

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