The Abandonment Signal

Checkout funnel data from a dozen payment processors shows a consistent pattern. Users complete checkout, enter payment amount, select blockchain network. The UI shows a gas fee estimate. At that moment, 18% to 35% of users abandon the flow.

The trigger is transparent. Users see the fee estimate and leave. The higher the gas fee, the higher the abandonment rate.

Data from Q4 2025 to Q1 2026 shows these abandonment rates.

  • Gas fee less than $1 means 8% abandonment
  • Gas fee $1 to $5 means 18% abandonment
  • Gas fee $5 to $20 means 28% abandonment
  • Gas fee $20 or more means 42% abandonment

This effect is strongest on retail payments (merchants processing user-to-business payments), weakest on B2B payments (business-to-business transfers where the sender is less price-sensitive).

The solution is gas sponsorship. The merchant or payment processor absorbs the gas cost. The user sees a gas-free checkout. Conversion improves.

How Much Does Conversion Improve?

Six payment processors implemented gas sponsorship and tracked conversion impact.

Processor A (travel industry, $200 average transaction). Conversion increased from 76% to 82% post-sponsorship. ROI on sponsorship cost was positive when transaction value exceeded $100.

Processor B (ecommerce, $50 average transaction). Conversion increased from 68% to 74%. Sponsorship ROI was barely positive at $50; breakeven sat at $65.

Processor C (subscription renewal, $15 monthly transaction). Conversion improved from 82% to 84%. Due to transaction size, sponsorship was not economically viable; processor discontinued it after two months.

Processor D (B2B invoice settlement, $5K-50K average transaction). Conversion increased from 89% to 93%. ROI was massively positive; processor now sponsors gas for all transactions.

Processor E (remittances, $200-2K average transaction). Conversion increased from 71% to 79%. ROI positive.

Processor F (crypto rewards claims, $50-500 average transaction). Conversion improved from 63% to 71%. ROI positive at transactions above $70.

Sponsorship improves conversion by 4-10 points. ROI turns positive at $50-$100 transaction size. Below that, sponsorship is uneconomical for most processors.

Economics and Implementation Approaches

Per-Chain Cost Analysis

Gas prices vary by chain, time of day, network congestion, and transaction type. These are the empirical costs as of April 2026, measured across both peak and off-peak times.

Ethereum L1 costs $1.85 for transfers and $5.20 for swaps. Polygon is $0.022 for transfers and $0.10 for swaps. Arbitrum costs $0.30 for transfers and $0.90 for swaps. Optimism is $0.44 for transfers and $1.30 for swaps. Base costs $0.13 for transfers and $0.52 for swaps. Solana is effectively negligible at $0.0008.

Summary of costs and use cases follows.

| Chain | Simple Transfer | Swap | Use Case |

|---|---|---|---|

| Ethereum L1 | $1.85 | $5.20 | High-value payments only |

| Polygon | $0.022 | $0.10 | All transaction sizes |

| Arbitrum | $0.30 | $0.90 | Mid-value, high volume |

| Optimism | $0.44 | $1.30 | Mid-value, moderate volume |

| Base | $0.13 | $0.52 | Small-value, high volume |

| Solana | $0.0008 | $0.0015 | All sizes (cost irrelevant) |

At transaction value $100, sponsoring a swap on Ethereum ($5.20) costs 5.2% of transaction value. At transaction value $500, it costs 1%. At $1000, it costs 0.52%. Below $50 transactions, sponsorship is not economical on Ethereum. On Polygon, sponsorship is economical for all transaction sizes above $0.10 (effectively always). On Base or Solana, sponsorship cost is negligible and should be applied to all transactions regardless of size.

Sponsorship Approaches

Three technical architectures support gas sponsorship and differ in cost, complexity, and control.

Paymaster Contracts. ERC-4337 Paymasters are smart contracts deployed on-chain. They hold a balance of the sponsorship token (ETH or stablecoins). When a user submits a UserOperation, the bundler requests the Paymaster to sponsor the gas. The Paymaster verifies the user is eligible (e.g., new account, high transaction volume, VIP merchant) and pre-signs the UserOperation. The bundler includes it in a bundle. On-chain, the Paymaster's balance is debited for the gas cost, and the user's account is credited.

Cost. $0.10 to $0.50 per sponsored transaction (Paymaster verification and accounting overhead). Available on all EVM chains and ERC-4337 compatible chains.

Pros. Users get frictionless UX; no signature required from user (Paymaster pre-signs). Decentralized (Paymaster contract code is auditable).

Cons. Requires ERC-4337 bundler integration (adds latency). Bundler dependency and concentration risk (85% of ERC-4337 volume via six bundlers).

Meta-Transactions (Relayer Networks). A relayer service (such as Gasless or Biconomy v2) observes signed meta-transaction objects from users. The user signs a meta-tx intent but does not broadcast it. The relayer then broadcasts a wrapper transaction that includes the user's signed intent. The wrapper pays for gas. The relayer deducts sponsorship cost from the user's account post-execution.

Cost. $.05 to $0.20 per relayed transaction (relayer markup on gas cost).

Available on all EVM chains.

Pros. Simpler integration than ERC-4337 (no bundler needed). User sees lower latency (single relay hop vs. bundler batching).

Cons. Centralized relayer (if the relay is down, sponsorship fails). Cost is higher than Paymaster (relayer includes profit margin). Less decentralized.

Direct Sponsorship (Protocol Level). Some L2s support native gas sponsorship at the protocol level where pre-funded sponsorship accounts deduct costs from a common pool. Cost is only the actual gas fee with no markup. It's the cheapest and fastest option but requires protocol-level integration and is unavailable on Ethereum L1.

Break-Even Analysis

Sponsorship is economical when the conversion uplift multiplied by transaction value and margin exceeds the sponsorship cost. On Ethereum L1 at $200 transactions, a $3.50 sponsorship cost exceeds the platform profit margin, making it uneconomical. On Polygon at the same transaction size, a $0.05 sponsorship cost is far below the conversion uplift, making it economical. On Base, sponsorship costs $0.10-$0.15 per swap and is economical across most transaction sizes and margin profiles. Rule of thumb. Ethereum L1 sponsorship works above $500 transactions. Polygon and Base work at all transaction sizes above $50.

When Sponsorship Backfires

Sponsorship reduces profitability when transaction size is below $30 on Ethereum or when margins are thin. If your conversion uplift is overstated (many processors estimate 8-10 points; real improvements are 4-6 points), retest before committing. Geographic variation matters. Users in low-income countries are more price-sensitive and show higher abandonment at gas fees. Consider sponsoring only for high-abandonment regions.

The Data-Driven Framework

Before deploying, run an A/B test with 10% of users seeing gas fees and 90% seeing sponsored transactions. Use one week of data to calculate empirical uplift. Calculate breakeven transaction size for each chain. Revisit monthly as gas prices and chain priorities change. Most processors find sponsorship economical on Polygon and Base for all transactions, uneconomical on Ethereum L1 below $500, and neutral on Arbitrum and Optimism.