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September 2026

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Documentation additions

Launched Facilitator Service, Circle’s hosted x402 facilitator for accepting USDC payments on Arc, Base, and Polygon PoS.

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August 2026

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Released Circle CLI 1.0.0.This release includes the following user-facing changes:
  • Updated circle gateway deposit --method eco to use Eco’s quoted, single-use deposit vaults. The command now waits for Eco to publish the deposit by default and supports --no-wait for asynchronous workflows.
  • Added version compatibility checks that guide you to circle update when a newer supported version is required.
See the CLI command reference for complete command syntax, including the updated Eco deposit options.

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July 2026

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Launched the Agent Marketplace, a curated catalog of x402-compatible services that accept USDC. Every listing is sanctions-screened and health-checked, so agents find services that are compliant and live.Two new integration paths:
  • Buyers (AI agents) discover services through the public, keyless Discovery API—GET https://api.circle.com/v2/x402/discovery/resources—with 14 query parameters to filter by category, blockchain, price, and more. No API key or account required.
  • Sellers (API owners) list a service and get paid in USDC per call. See Become a seller for the nanopayments and vanilla x402 rails, or Get listed to submit a listing.
Browse the live catalog at agents.circle.com/services.

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May 2026

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Added documentation for Agent Nanopayments, which enables AI agents to make sub-cent USDC payments to x402-compatible services using Circle CLI.

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Documentation additions

The following Agent Nanopayments documentation was created:

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Documentation updates

The following how-tos moved from Agent Wallets into the new Agent Nanopayments section:
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Launched Agent Stack, a new product line for AI agents to manage wallets, transact onchain, and pay for x402-compatible services using Circle CLI.

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Documentation additions

The following Agent Stack and Circle CLI documentation was created:The following Agent Wallets documentation was created: