Pennyforge

One-person studio forging small tools that replace SaaS. Built SendCheck, a free crypto address checker. Writing about Base, stablecoin rails, and shipping solo.

Joined on Aug 27, 2026 https://sendcheck.surge.sh

Pennyforge

Sep 15

I sell x402 conformance checks. A stranger's board started checking me back.

#x402 #web3 #crypto #data

4 min read

Want to connect with Pennyforge?

Create an account to connect with Pennyforge. You can also sign in below to proceed if you already have an account.

Create Account

Already have an account? Sign in

Pennyforge

Sep 15

Who actually settles x402 payments? Not the people paying.

#x402 #web3 #crypto #data

3 min read

Pennyforge

Sep 15

Who actually pays on the first x402 marketplace? We checked the chain.

#x402 #web3 #crypto #data

4 min read

Pennyforge

Sep 14

Tiny unknown USDC transfers: check before you send

#crypto #security #usdc #web3

5 min read

Pennyforge

Sep 13

I counted every payment on the first x402 marketplace — $3.42, 93% of it the platform's own tests

#showdev #api #crypto #web3

4 min read

Pennyforge

Sep 11

I counted USDC payments to every published Polygon x402 wallet: $28.48 in 30 days

#showdev #api #crypto #web3

7 min read

Pennyforge

Sep 11

I measured every x402 wallet that claims Arbitrum: $11.28 in 30 days

#showdev #api #crypto #web3

5 min read

Pennyforge

Sep 10

I counted the payments behind every Solana x402 address: $12.84 in 30 days

#showdev #api #crypto #web3

8 min read

Pennyforge

Sep 9

I pulled all 680 x402 services and counted the payments: Solana does 74% of the measured transactions

#showdev #api #crypto #web3

6 min read

Pennyforge

Sep 6

One x402 service rotated its pay address 964 times in 10 days. I measured 90 days of the drift feed.

#showdev #api #crypto #web3

5 min read

Pennyforge

Sep 5

659 services, $0.01 median, 13 verified: a field guide to the x402 directories

#showdev #stablecoins #crypto #api

4 min read

Pennyforge

Sep 3

Our $0.01 API hung for three days — the culprit was a GET request

#showdev #cloudflare #api #crypto

6 min read

Pennyforge

Aug 27

Exchanges are quietly dropping stablecoin rails. Here is the dated log.

#showdev #web3 #cryptocurrency #stablecoin

4 min read

Pennyforge

Aug 27

I built a free checker that reads a crypto address before you send (SendCheck)

#showdev #web3 #crypto #javascript

2 min read

DEV Community

Pennyforge

Badges

1 Week Community Wellness Streak

Writing Debut

I sell x402 conformance checks. A stranger's board started checking me back.

Want to connect with Pennyforge?

Who actually settles x402 payments? Not the people paying.

Who actually pays on the first x402 marketplace? We checked the chain.

Tiny unknown USDC transfers: check before you send

I counted every payment on the first x402 marketplace — $3.42, 93% of it the platform's own tests

I counted USDC payments to every published Polygon x402 wallet: $28.48 in 30 days

I measured every x402 wallet that claims Arbitrum: $11.28 in 30 days

I counted the payments behind every Solana x402 address: $12.84 in 30 days

I pulled all 680 x402 services and counted the payments: Solana does 74% of the measured transactions

One x402 service rotated its pay address 964 times in 10 days. I measured 90 days of the drift feed.

659 services, $0.01 median, 13 verified: a field guide to the x402 directories

Our $0.01 API hung for three days — the culprit was a GET request

Exchanges are quietly dropping stablecoin rails. Here is the dated log.

I built a free checker that reads a crypto address before you send (SendCheck)