Edy Cu

Edy Cu

Sep 25

50,000 property tests passed while my app crowned an impostor

#showdev #typescript #testing #crypto

7 min read

Edy Cu

Sep 25

Nansen called Binance 14 a 'Token Billionaire'. The name cost 1 credit

#showdev #typescript #web3 #api

6 min read

Edy Cu

Sep 25

I built a sell planner to dodge the pros. They were under 4% of buys

#showdev #typescript #api #web3

7 min read

Edy Cu

Sep 25

My AI trading tool would sign a wallet drain as a login challenge

#showdev #security #mcp #solana

5 min read

Edy Cu

Sep 23

I went looking for sandwiches and found a DEX pool trading with itself

#showdev #python #api #opensource

6 min read

Edy Cu

Sep 23

Two in three 'liquidity pulled' alerts are the same wallet putting it back

#showdev #python #api #web3

1

6 min read

Edy Cu

Sep 23

My fact-checker said CONFIRMED about a group that doesn't exist

#showdev #typescript #api #testing

6 min read

Edy Cu

Sep 22

has_tokens: true is a boolean. 476 of 791 have no market behind them.

#showdev #python #api #opensource

5 min read

Edy Cu

Sep 22

Twice the workers, 14% faster, three broken calls: what a 110-call map taught me about API latency

#showdev #typescript #api #performance

1

7 min read

Edy Cu

Sep 21

I claimed my gas refunds were exact. An audit found the 21,000 I was crediting twice.

#showdev #solidity #web3 #ethereum

6 min read

Edy Cu

Sep 21

A USDC deposit address with no private key — and the 9,999-block RPC cap that almost froze it

#showdev #solidity #web3 #ethereum

6 min read

Edy Cu

Sep 20

Four numbers, five labels: how far can you read a crypto wallet without a model?

#showdev #typescript #crypto #web3

6 min read

Edy Cu

Sep 14

I built a phone agent for government counters. It couldn't press 1.

#showdev #ai #javascript #hackathon

1

6 min read

Edy Cu

Sep 10

400 rounds, and the bug never showed up. So I stopped rolling dice.

#showdev #testing #solidity #webdev

2

1

6 min read

Edy Cu

Sep 10

Hedera's EVM speaks tinybar, its RPC speaks weibar, and both mistakes return SUCCESS

#showdev #hedera #solidity #web3

2

7 min read

Edy Cu

Sep 8

The metric I designed was the same number twice

#showdev #python #api #opensource

5 min read

Edy Cu

Sep 7

I built a detector for stuck Safe transactions. 93% of what it found was already dead.

#showdev #ethereum #web3 #javascript

5 min read

Edy Cu

Sep 7

The one fact no Ethereum receipt carries: which transaction ran first

#showdev #ethereum #solidity #web3

5 min read

Edy Cu

Aug 30

Sampling rate is a correctness property, not a performance knob

#showdev #python #sql #ai

1

5 min read

Edy Cu

Aug 30

Feature detection lies: two things I learned shipping on WebMCP

#showdev #webdev #javascript #ai

1

5 min read

Edy Cu

Aug 27

438 of 536 quarantined — and not one was a bad verdict

#showdev #ai #python #googlecloud

2

5 min read

Edy Cu

Aug 27

My agent's p50 was 29s. Its p95 was 182s. That ratio decided the product.

#showdev #ai #typescript #webdev

1

7 min read

Edy Cu

Aug 27

Decentraland warns your scene UI will clash with its mobile controls — but won't say where they are

#showdev #gamedev #typescript #ux

2

1

6 min read

Edy Cu

Aug 27

Six contracts that pass EXTCODESIZE(owner) > 0 and still withdraw their order

#showdev #solidity #security #web3

6 min read

Edy Cu

Aug 16

I shipped an MCP server that reported success without signing anything

#mcp #ai #security #typescript

2

3

6 min read

DEV Community

Badges

Writing Debut

50,000 property tests passed while my app crowned an impostor

Nansen called Binance 14 a 'Token Billionaire'. The name cost 1 credit

I built a sell planner to dodge the pros. They were under 4% of buys

My AI trading tool would sign a wallet drain as a login challenge

I went looking for sandwiches and found a DEX pool trading with itself

Two in three 'liquidity pulled' alerts are the same wallet putting it back

My fact-checker said CONFIRMED about a group that doesn't exist

has_tokens: true is a boolean. 476 of 791 have no market behind them.

Twice the workers, 14% faster, three broken calls: what a 110-call map taught me about API latency

I claimed my gas refunds were exact. An audit found the 21,000 I was crediting twice.

A USDC deposit address with no private key — and the 9,999-block RPC cap that almost froze it

Four numbers, five labels: how far can you read a crypto wallet without a model?

I built a phone agent for government counters. It couldn't press 1.

400 rounds, and the bug never showed up. So I stopped rolling dice.

Hedera's EVM speaks tinybar, its RPC speaks weibar, and both mistakes return SUCCESS

The metric I designed was the same number twice

I built a detector for stuck Safe transactions. 93% of what it found was already dead.

The one fact no Ethereum receipt carries: which transaction ran first

Sampling rate is a correctness property, not a performance knob

Feature detection lies: two things I learned shipping on WebMCP

438 of 536 quarantined — and not one was a bad verdict

My agent's p50 was 29s. Its p95 was 182s. That ratio decided the product.

Decentraland warns your scene UI will clash with its mobile controls — but won't say where they are

Six contracts that pass EXTCODESIZE(owner) > 0 and still withdraw their order

I shipped an MCP server that reported success without signing anything