Circle has introduced Nanopayments, a new infrastructure layer supporting USDC transfers as tiny as $0.000001, claiming to remove gas fees entirely from sub-cent payments. The release is designed for an emerging agentic economy, where autonomous AI agents demand rapid, frequent, and tiny payments to interact and transact with digital resources. Circle, established in 2013, is an American fintech company behind the USDC stablecoin and provides financial infrastructure for digital assets and global payments.
Barriers To Small Payments For AI Agents
Developers working with autonomous agents increasingly need payment infrastructure that can handle high-frequency, low-value transactions. Legacy rails—built for human-driven commerce—involve fixed fees and settlement delays, making ultra-small transactions impractical. Even on efficient blockchain networks, fees regularly exceed the micro-transfer values needed for agent-to-agent commerce; on Ethereum, a $0.000001 transfer would incur costs equal to more than 53 million percent of the payment. Such economics clearly prevent scalable machine-to-machine interactions.
Low-cost blockchains like Solana reduce but do not eliminate these issues. Dynamic congestion and unpredictable gas prices remain key obstacles. At the same time, the need for interoperability across multiple chains complicates adoption, as merchants and buyers may not transact on the same network, increasing the burden for developers unfamiliar with the crypto landscape.
Technical Design And Security Mechanisms
Circle’s solution aggregates micro-transactions offchain and batches them for onchain settlement. Agents make a single USDC deposit to the Circle Gateway contract, funding their Nanopayments account. When purchasing a paid resource, the agent receives a “402 Payment Required” status and payment details from the merchant. The agent signs an EIP-3009 authorization for the specified USDC amount and reattempts the access request. Merchants then forward the signed authorization to Nanopayments, which checks the signature and deducts the amount from the agent’s offchain balance.
Settlements occur asynchronously: many signed authorizations are verified within a Trusted Execution Environment (TEE) and submitted as a single blockchain transaction. The smart contract validates the batch TEE signature before updating user balances, helping keep onchain costs stable and predictable. This batched approach removes individual payment gas fees, allowing throughput to scale beyond the limitations of public chain congestion.
Circle emphasized in a public announcement that Nanopayments offers:
no per-transaction gas drag, predictable throughput at scale, and standardized agent-to-merchant payments, describing the system as “the financial rail for agentic economic activity.”
Compatibility with the x402 v2 protocol, originally developed by Coinbase, is maintained. The standard request and response format does not change, focusing improvements on aggregation, verification, and settlement steps so that existing integrations require little or no adaptation.
The system’s non-custodial structure means funds are only moved through user-signed authorizations, ensuring agents retain full control. Circle describes the approach as well suited for AI-driven workflows and pay-as-you-use digital marketplace business models.
