soulcap
Get API Key
Private Beta

Your users should never see a gas fee.

One API call. Gas is sponsored. You get billed.

Join the WaitlistHow it works

4

Chains supported

<1s

Avg. sponsorship

3

Lines of code

1import Soulcap from '@soulcap/sdk'
2const sc = new Soulcap('sk_live_...')
3await sc.sponsor(userTransaction)
// Gas paid. User sees nothing. You get one invoice.
$npm install @soulcap/sdk
How it works

Four steps. Zero gas UX.

01

Integrate SDK

Install our npm package and initialize with your API key. Three lines of code.

02

User transacts

Your user signs a transaction normally. They never see gas fees or need native tokens.

03

We pay gas

Soulcap sponsors the gas fee on-chain in real time. Sub-second, every chain.

04

You get billed

We aggregate your usage. You get one simple invoice at the end of each month.

SDK→User tx→Gas paid→Invoice
Multi-chain

Sponsor gas on any chain.

One integration. Multiple networks. More chains coming soon.

E

Ethereum

Mainnet L1

B

Base

Coinbase L2

P

Polygon

PoS sidechain

A

Arbitrum

Optimistic L2

+ Optimism, zkSync, Avalanche, and more on the roadmap

Pricing

Simple, transparent pricing.

Start free. Scale as you grow. No hidden fees.

Free

$0/month

Perfect for prototyping and testing.

  • 1,000 sponsored tx/month
  • 2 supported chains
  • Community support
  • Dashboard analytics
Start Free
Most Popular

Growth

$0.02/transaction

For teams scaling to production.

  • 100K sponsored tx/month
  • All supported chains
  • Priority support
  • Advanced analytics
  • Webhook integrations
  • Custom gas policies
Join Waitlist

Scale

Custom

Enterprise-grade gas sponsorship.

  • Unlimited transactions
  • All chains + custom RPCs
  • Dedicated account manager
  • SLA guarantees
  • Volume discounts
  • On-prem deployment option
Contact Us
Early Access

Get early access.

We're onboarding teams for our private beta. Drop your email and we'll reach out when it's your turn.