Overview

The Circle CLI (@circle-fin/cli, command circle) is a holistic stablecoin CLI for AI agents. It surfaces Circle's full agent-facing stack — wallet management, cross-chain transfers, paid services, Gateway/Nanopayments, smart contracts, spending policy, transaction operations, and Circle's own skill catalog — through one consistent binary. New capabilities ship continuously; this skill is the front door that introduces the CLI broadly and routes to specialized skills for deep flows.

If the user is doing something narrow (paying for a service, setting up the wallet for the first time, configuring a spending limit), use one of the dedicated skills under Alternatives below. Use this skill when the user is exploring what the CLI can do, when they're doing something that doesn't have its own dedicated skill yet (e.g., bridging, smart contract execution), or when you need a quick orientation across the full command surface.

Install & verify

# Install only if missing:
command -v circle >/dev/null || npm install -g @circle-fin/cli
# Check the version (also surfaces any update notice from Circle's server):
circle --version

Discoverability: always ask --help

The CLI is self-documenting. Whenever the agent is unsure about a verb, flag, output shape, or whether a command exists, run --help on the relevant scope first — don't guess flags, don't invent commands.

# Scope pattern — top-level, per command group, per verb:
circle --help                          # all top-level commands (wallet, bridge, services, ...)
circle <command> --help                # verbs available under a command group
circle <command> <verb> --help         # flags, examples, and output format for a verb
# Examples:
circle wallet --help                   # all verbs under `wallet`
circle services pay --help             # flags and examples for `circle services pay`
circle bridge transfer --help          # flags and output shape for cross-chain bridging

The CLI ships new commands and flags faster than this document. Always prefer --help output over what's documented here when they disagree — the help text reflects the installed version, this skill might lag.

Command surface (high-level)

Top-level command groups, organized by what the user typically wants to do:

Wallet & identity

Command	What it does
circle wallet create	Create a Circle-managed agent wallet on supported EVM chains
circle wallet login / logout / status	Email + OTP authentication for the agent wallet (two-step --init / --otp flow designed for non-interactive agents)
circle wallet list	List wallets (filter by --type agent or --type local, requires --chain)
circle wallet balance	Show token balances for a wallet on a chain
circle wallet transfer	Send USDC (or another supported token) from this wallet to another address on the same chain
circle wallet fund	Open a fiat on-ramp or render a deposit QR code so the user can fund the wallet
circle wallet limit show/set/reset	View and change spending policy (mainnet only; set/reset require human OTP)
circle wallet execute	Execute a smart contract function (any chain Circle supports)
circle terms show/accept/reset	Manage Circle CLI Terms of Use acceptance (gates wallet commands; never accept on the user's behalf without consent)

Cross-chain & on-chain operations

Command	What it does
circle bridge transfer	Bridge USDC to another blockchain via CCTP (~8–20s on fast chains, longer on slow chains)
circle bridge status	Check progress of a bridge transfer
circle bridge get-fee	Show CCTP fee schedule
circle gateway deposit	Move on-chain USDC into Circle Gateway for nanopayments (eco lands on Polygon ~50-60s for $0.03; direct stays on source chain)
circle gateway balance	Show Gateway / Nanopayments balance per chain
circle gateway withdraw	Move Gateway balance back to a wallet (same-chain only in v1)

Paid services (x402)

Command	What it does
circle services search	Search the x402 paid-API marketplace by keyword
circle services inspect	Inspect a paid endpoint — pricing, schema, supported chains, payment scheme
circle services pay	Make a paid HTTP request with automatic x402 payment in USDC

Smart contracts

Command	What it does
circle contract address	Show Circle contract addresses (USDC token, Gateway, etc.) per chain
circle contract query	Read-only ABI query against any deployed contract
circle wallet execute	Execute a write call against any contract (state-changing transaction)

Transactions

Command	What it does
circle transaction list	Show transaction history for a wallet on a chain
circle transaction cancel	Cancel a pending transaction (replace-by-nonce)
circle transaction accelerate	Speed up a pending transaction (replace-with-higher-gas)

Discovery & tooling

Command	What it does
circle blockchain list	List supported blockchains with their public RPC defaults
circle blockchain config	Inspect or set per-chain RPC overrides
circle skill list/info/install/update	Discover and install Circle skills from the circlefin/skills catalog
circle feedback submit	Send product feedback about the CLI itself (bug, question, or UX friction) to Circle; requires a mainnet session

This list will keep growing as Circle ships more capabilities. For any unfamiliar command, run <command> --help — it is authoritative and reflects the CLI you have installed, not this document.

Common end-to-end flows

For each common flow, there's a dedicated skill that handles the full walkthrough. If the user's task matches one of these, route to the named skill.

User intent	Skill to use
"Set up Circle / log in / create an agent wallet"	use-agent-wallet
"Pay for a service / call a paid API / use the x402 marketplace"	pay-via-agent-wallet
"Fund my wallet / add USDC / deposit into Gateway"	fund-agent-wallet
"Set / change spending limits / view current caps"	agent-wallet-policy
"Bridge USDC to another chain (CLI)"	This skill — circle bridge transfer is the right command
"Execute a smart contract / read a contract"	This skill — circle wallet execute for writes, circle contract query for reads
"Manage transactions / cancel a pending tx"	This skill — circle transaction list/cancel/accelerate
"Build with Circle SDKs in an app"	One of the SDK-flavored use-* or bridge-* skills (those are for app code generation, not agent CLI use)

If the task fits a dedicated skill, hand off there — that skill has the gotchas and decision trees baked in (some, like pay-via-agent-wallet and fund-agent-wallet, also ship allowed-tools whitelists). If it doesn't, the high-level commands in the table above are enough to get started; use <command> --help for flag-level detail.

Report friction (feedback)

The CLI can send feedback to Circle with circle feedback submit (--category BUG|QUESTION|FEEDBACK). Submit proactively when the CLI itself causes friction — an unexpected error, output that contradicts --help, or a missing capability — but not for user mistakes or expected validation errors. It requires a mainnet session; never force a login just to file feedback. READ references/cli-operations.md for triggers, guardrails, and the --recent-commands enrichment.

Rules

• ALWAYS run <command> --help when you're unsure about flags or output shape — the help text is authoritative and reflects the installed CLI version, not this skill.
• ALWAYS pass --output json for commands whose output the agent needs to parse.
• ALWAYS pass --chain when running circle wallet list, circle wallet balance, circle wallet transfer, circle bridge transfer, circle gateway *, circle contract *, and circle transaction *. If unsure which chain to use, run circle blockchain list first.
• NEVER accept Circle's Terms of Use on the user's behalf — even with CIRCLE_ACCEPT_TERMS=1. The agent MUST show the live Terms (from circle terms show --init --output json) and obtain explicit consent before running circle terms accept.
• NEVER guess or hardcode the user's email address for circle wallet login.
• NEVER store, log, or display private keys, OTP codes, or session tokens beyond their immediate use.
• Treat the CLI as the source of truth for the user's wallet state. Don't infer balances or transaction status — query the CLI fresh.
• Default to mainnet for the agent wallet flow unless the user explicitly requests testnet. Spending policy is mainnet-only.
• For routine permissionless tasks the user has already asked for, act first and summarize after — don't ask for re-confirmation on routine read-only operations like wallet balance or services search.
• PROACTIVELY file feedback with circle feedback submit (pick one --category: BUG, QUESTION, or FEEDBACK) when the CLI itself causes friction (unexpected error, confusing output, missing capability). Don't file for user mistakes or expected validation errors, and never force a login just to submit. See Report friction (feedback).

Staying current

Surface version/update guidance to the user when relevant — start of session, after a long gap, or when a command behaves unexpectedly. circle --version surfaces update notices; npm install -g @circle-fin/cli@latest updates the CLI; circle skill update --tool <tool> (or npx skills update) updates installed skills. These mutate the user's system — ask before running them, don't run them unprompted. READ references/cli-operations.md for the exact commands.

Reference Links

• Full setup walkthrough: https://agents.circle.com/skills/setup.md
• Circle Developer Docs: https://developers.circle.com/llms.txt — Always read this when looking for source documentation on Circle products
• x402 protocol concepts: https://developers.circle.com/gateway/nanopayments/concepts/x402
• Service Discovery skill (paid services walkthrough): https://agents.circle.com/services/SKILL.md
• Discovery API OpenAPI spec: https://agents.circle.com/.well-known/openapi.json
• Circle Agent Card (a2a): https://agents.circle.com/.well-known/a2a.json
• Circle agent-facing skill index: https://agents.circle.com/.well-known/agent-skills/index.json
• CLI package on npm: @circle-fin/cli

Alternatives

For the agent-wallet flows, route to the dedicated skill per the Common end-to-end flows table above: use-agent-wallet (setup/login/Terms/create), pay-via-agent-wallet (paid x402 services), fund-agent-wallet (add USDC / Gateway deposit), agent-wallet-policy (spending limits).

Trigger one of the SDK-flavored skills (use-usdc, use-gateway, bridge-stablecoin, swap-tokens, use-circle-wallets, use-developer-controlled-wallets, use-user-controlled-wallets, use-modular-wallets, use-smart-contract-platform, use-arc) instead when the user is writing application code with Circle SDKs (e.g., @circlefin/app-kit, @circlefin/bridge-kit) or wants architectural guidance (choosing a wallet type, integrating CCTP, deploying contracts).

The CLI is for agent-flow use (an AI agent operating on behalf of a user). The SDK skills are for code-generation use (helping a developer write application code).

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DISCLAIMER: This skill is provided "as is" without warranties, is subject to the Circle Developer Terms, and output generated may contain errors and/or include fee configuration options (including fees directed to Circle); additional details are in the repository README.