Which blockchain for
AI agent payments?
10 agent-critical criteria. Ergo, Ethereum, Solana, Cardano — evaluated honestly across reentrancy risk, fee predictability, acceptance predicates, Babel Fees, MEV exposure, and chain halt history.
Reentrancy-safe
Can autonomous agent code be exploited via reentrancy attacks?
eUTXO: each UTxO spent exactly once. Reentrancy impossible by design.
Account model with shared state. DAO hack was reentrancy. Agents at risk.
No reentrancy in Solana's execution model.
eUTXO model like Ergo. No reentrancy by design.
Deterministic fees
Agent knows exact transaction cost before submitting.
Fee calculated from input/output sizes. Fully deterministic before submission.
Gas price volatile. EIP-1559 improves predictability but agents still face uncertainty.
Base fees predictable, but priority fees vary with congestion.
Fee formula is deterministic from transaction size.
Acceptance predicates
Payment can encode 'accept only if task X is complete' logic on-chain.
ErgoScript acceptance predicates are first-class protocol primitives.
Possible via escrow contracts, but not embedded in the payment instrument itself.
No equivalent primitive. Would require complex off-chain coordination.
Plutus scripts can encode conditions, but not as payment-embedded predicates.
Note + Reserve stack
Protocol-level bearer instruments with collateral backing for agent credit.
Note+Reserve+Tracker is a first-class pattern. ChainCash is live mainnet implementation.
No equivalent protocol primitive. Would require custom token + escrow + oracle.
No equivalent primitive.
Can be built in Plutus but not a native pattern.
Babel Fees (any-token fees)
Agents can pay transaction fees with any token — no native token wallet required.
Babel Fees are live on Ergo mainnet. Agents don't need pre-funded ERG wallets.
ERC-4337 account abstraction allows gas sponsorship, but complex and costly.
SOL required for fees. No equivalent gas abstraction.
ADA required for fees in the base protocol.
MEV exposure
Transactions can be front-run or reordered by miners/validators.
eUTXO eliminates most MEV vectors. No mempool frontrunning on deterministic outputs.
Significant MEV. Front-running and sandwich attacks common on agent transactions.
MEV present. Jito bundles and searchers actively extract from Solana transactions.
eUTXO also limits MEV. Batchers introduce some centralization but minimal MEV.
Micropayment viability
Sub-cent payments ($0.001) are economically viable.
~$0.01 per tx on mainnet. $0.001 API calls viable with Note batching.
Gas often $0.50–$5+ per tx. Sub-cent payments never economically viable on L1.
$0.00025 base fee. Micropayments viable.
~$0.17 min tx. Too high for true micropayments.
Chain halt history
Has the network had full outages? Critical for autonomous agent infrastructure.
No chain halts. PoW provides continuous liveness without governance emergencies.
No full halts. Some finality issues post-merge but chain keeps producing blocks.
Multiple full chain halts. 7+ documented outages. Unacceptable for agent infra.
No significant chain halts.
Ephemeral agent support
Agents can operate without persistent identity, KYC, or pre-registered wallets.
Any key pair can transact. Babel Fees remove ERG bootstrapping requirement.
Any address can transact but ETH required for gas. ERC-4337 helps but adds complexity.
Any keypair can transact. SOL for fees required.
Any key can transact. ADA for fees required.
Fair launch / censorship resistance
No foundation kill switch. No governance emergency stop for agent infrastructure.
PoW with no pre-mine, no foundation token, no validator cartel. No kill switch.
Foundation has significant influence. OFAC compliance led to ~72% MEV-boost censorship.
Foundation and validators have coordinated chain restarts. Governance intervention possible.
IOHK/Emurgo/CF have significant governance power. Less decentralized than Ergo.
What makes Ergo uniquely suited
These aren't marketing claims. They're structural properties of Ergo's protocol that no other chain replicates for autonomous agent use cases.
Only chain with zero reentrancy
eUTXO architecture makes reentrancy attacks structurally impossible. Critical for autonomous agent code executing without human oversight.
Only chain with protocol-level acceptance predicates
ErgoScript acceptance predicates embed task completion logic directly in payment instruments. No off-chain oracle, no escrow contract, no dispute layer.
Only chain with Babel Fees + Note stack
Agents don't need pre-funded native token wallets. Babel Fees handle gas in any token. The Note+Reserve+Tracker stack is protocol-level, not application-layer.
No chain halts + PoW liveness
Agent infrastructure requires 24/7 liveness. Ergo's PoW has no governance emergency stops, no validator cartel, no foundation kill switch.
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