Agent skill

Use Usdc

USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana.

Apache-2.0Auto-check: notesBackend & APIs

Install Use Usdc

skills CLI

$ npx skills add circlefin/skills --skill use-usdc -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install circlefin/skills use-usdc --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/circlefin/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/circle/skills/use-usdc .claude/skills/use-usdc && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "use-usdc" agent skill from https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc into .claude/skills/use-usdc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-usdc", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add circlefin/skills --skill use-usdc -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install circlefin/skills use-usdc --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/circlefin/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/circle/skills/use-usdc .agents/skills/use-usdc && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "use-usdc" agent skill from https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc into .agents/skills/use-usdc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-usdc", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add circlefin/skills --skill use-usdc -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install circlefin/skills use-usdc --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/circlefin/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/circle/skills/use-usdc .cursor/skills/use-usdc && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "use-usdc" agent skill from https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc into .cursor/skills/use-usdc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-usdc", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/circlefin/skills.git --path plugins/circle/skills/use-usdc

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add circlefin/skills --skill use-usdc -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install circlefin/skills use-usdc --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/circlefin/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/circle/skills/use-usdc .gemini/skills/use-usdc && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "use-usdc" agent skill from https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc into .gemini/skills/use-usdc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-usdc", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install circlefin/skills use-usdc

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add circlefin/skills --skill use-usdc -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/circlefin/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/circle/skills/use-usdc .github/skills/use-usdc && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "use-usdc" agent skill from https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc into .github/skills/use-usdc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-usdc", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add circlefin/skills --skill use-usdc -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install circlefin/skills use-usdc --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/circlefin/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/circle/skills/use-usdc .opencode/skills/use-usdc && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "use-usdc" agent skill from https://github.com/circlefin/skills/tree/master/plugins/circle/skills/use-usdc into .opencode/skills/use-usdc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-usdc", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: use-usdc
GitHub stars: 155
Token cost: ~2.4k tokens
SKILL.md length: 927 words
Files: 3 (incl. references)
Skills in repo: 18
Repo updated: Sep 16, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana.

Works in 6 steps: Determine the ecosystem -- EVM (0x...)… → Classify the operation -- a read… → Confirm details -- for a write, validate… → …
Approve spending
SKILL.md covers Overview, Prerequisites / Setup, Quick Reference and Core Concepts, plus 5 more sections
Calls npm

What it does

Use Usdc is an agent skill from circlefin/skills. USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana. Use this skill to check balances, send transfers, approve spending, and verify transactions. Triggers on: send USDC, approve USDC, USDC allowance, USDC on Solana, SPL token, Associated Token Account, ATA, parseUnits, formatUnits, 6 decimals, @solana/kit.

Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/evm.md` and `references/solana.md`).

It sits in Backend & APIs, covering Smart contracts and Crypto and DeFi analysis. It works with Circle USDC, Solana, Ethereum and Arbitrum. The repository describes itself as: Circle's open source skills for AI-assisted development. The licence is Apache-2.0.

When your agent uses it

Approve spending
Verify transactions
Associated Token Account

Example prompts

“/use-usdc”

Requirements

Node.js

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

Determine the ecosystem -- EVM (0x...) or Solana (base58); ask if unclear (see Prerequisites / Setup).
Classify the operation -- a read (balance, allowance, supply, verify) runs autonomously; a write (send, approve) requires explicit user…
Confirm details -- for a write, validate the recipient address, amount (6 decimals), and chain ID (testnet vs mainnet). Default to…
Route to the reference -- READ references/evm.md or references/solana.md for the exact code (on Solana, create the recipient ATA first).
Execute -- run the read, or submit the write only after confirmation, using the correct native USDC address for the chain.
Verify -- wait for the transaction receipt/confirmation before reporting success, and surface the tx hash.

What it can do on your machine

Read from SKILL.md and the folder at commit 58ab864. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- npm
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- developers.circle.com
- faucet.circle.com
- faucet.solana.com
- viem.sh
- github.com
- console.circle.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Use Usdc loads about 2.4k tokens when it runs, and up to ~7.2k if it reads all its reference files. Until then it costs about 103 tokens; SKILL.md has 927 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~103
When it runs · the whole SKILL.md, loaded when a task matches: ~2.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~7.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NoteMentions a .env fileSKILL.md:164

s manager. Add `.gitignore` entries for `.env*` and secret files when scaffolding.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from circlefin/skills at commit 58ab864, republished under its Apache-2.0 licence (© circlefin). 927 words, ~2,365 tokens.

Download SKILL.mdSave it as .claude/skills/use-usdc/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: use-usdc
description: USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana. Use this skill to check balances, send transfers, approve spending, and verify transactions. Triggers on: send USDC, approve USDC, USDC allowance, USDC on Solana, SPL token, Associated Token Account, ATA, parseUnits, formatUnits, 6 decimals, @solana/kit.

Overview

USDC is Circle's stablecoin deployed across multiple blockchain ecosystems. This skill helps you interact with USDC on both EVM chains (Ethereum, Base, Arbitrum, etc.) and Solana. It covers balance checks, transfers, approvals, and transfer verification.

Prerequisites / Setup

Determine Ecosystem

First, identify which ecosystem the user is working with:

EVM: User has an Ethereum-style address (0x...) or mentions Ethereum, Base, Arbitrum, Polygon, etc.
Solana: User has a base58 address or mentions Solana, Devnet, Phantom, Solflare, etc.
Unclear: Ask which ecosystem before proceeding.

Dependencies

EVM:

bash

npm install viem

Solana:

bash

npm install @solana/kit @solana-program/token ws dotenv bs58

Environment Variables

See ecosystem-specific guides:

EVM: Private key handling covered in references/evm.md
Solana: Private key handling covered in references/solana.md

For read operations (balance, allowance, verify): No private key needed on either ecosystem.

Quick Reference

USDC Contract Addresses

Canonical source: https://developers.circle.com/stablecoins/usdc-contract-addresses

EVM Testnet

Chain	Chain ID	USDC Address
Arc Testnet	5042002	`0x3600000000000000000000000000000000000000`
Ethereum Sepolia	11155111	`0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238`
Base Sepolia	84532	`0x036CbD53842c5426634e7929541eC2318f3dCF7e`
Arbitrum Sepolia	421614	`0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d`
Avalanche Fuji	43113	`0x5425890298aed601595a70AB815c96711a31Bc65`
Polygon Amoy	80002	`0x41E94Eb019C0762f9Bfcf9Fb1E58725BfB0e7582`
OP Sepolia	11155420	`0x5fd84259d66Cd46123540766Be93DFE6D43130D7`

Get testnet USDC: https://faucet.circle.com

EVM Mainnet

Chain	USDC Address
Arc	`0x3600000000000000000000000000000000000000`
Ethereum	`0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48`
Base	`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`
Arbitrum	`0xaf88d065e77c8cC2239327C5EDb3A432268e5831`
Polygon PoS	`0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359`
Avalanche	`0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E`
OP Mainnet	`0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85`

Solana

Network	USDC Mint
Devnet	`4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU`
Mainnet	`EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v`

The 6-Decimal Rule

USDC uses 6 decimals on all ecosystems.

// EVM (viem)
parseUnits("1.00", 6);    // 1_000_000n (CORRECT - $1 USDC)
parseUnits("1.00", 18);   // 1_000_000_000_000_000_000n (WRONG - 1 trillion dollars)

// Solana - convert manually
const amount = Math.floor(1.00 * 1_000_000); // 1_000_000 (CORRECT - $1 USDC)
const human = rawAmount / 1_000_000;          // 1.0 (CORRECT - converts back to dollars)

Arc USDC Duality

On Arc, USDC is both the native gas token and an ERC-20 at 0x3600.... Same underlying balance, different decimal exposure.

Context	Decimals	Use
Native (gas, `msg.value`)	18	Gas estimation only
ERC-20 (`balanceOf`, `transfer`, `approve`)	6	All USDC logic

For Arc-specific setup and configuration, see the use-arc skill.

Core Concepts

Operation Types

Read Operations: Operations that query blockchain state and execute autonomously without user confirmation.

Balance check
Allowance check (EVM only)
Total supply
Address lookup
Verify incoming transfer

Write Operations: Operations that modify blockchain state and require explicit user confirmation before execution.

Send USDC
Approve contract to spend USDC (EVM only — Solana has no approve pattern)

Troubleshooting

Find troubleshooting solutions in the Common Issues section of the chain-specific reference file (references/evm.md or references/solana.md).

EVM vs Solana at a Glance

Aspect	EVM	Solana
Token standard	ERC-20	SPL Token
Balance storage	Wallet address directly	Associated Token Account (ATA)
Send	`transfer(to, amount)`	`getTransferInstruction({ source, destination, authority, amount })`
Approve	`approve(spender, amount)`	No approve — use PDAs
Recipient setup	Nothing needed	Must create ATA first (transfer fails otherwise)
Tx fees	Chain native token	SOL
Confirmation	`waitForTransactionReceipt`	`sendAndConfirmTransactionFactory`
Libraries	viem	@solana/kit + @solana-program/token
Decimals	6	6

Workflow

Determine the ecosystem -- EVM (0x...) or Solana (base58); ask if unclear (see Prerequisites / Setup).
Classify the operation -- a read (balance, allowance, supply, verify) runs autonomously; a write (send, approve) requires explicit user confirmation.
Confirm details -- for a write, validate the recipient address, amount (6 decimals), and chain ID (testnet vs mainnet). Default to testnet; warn on mainnet or amounts over the safety threshold.
Route to the reference -- READ references/evm.md or references/solana.md for the exact code (on Solana, create the recipient ATA first).
Execute -- run the read, or submit the write only after confirmation, using the correct native USDC address for the chain.
Verify -- wait for the transaction receipt/confirmation before reporting success, and surface the tx hash.

Implementation Patterns

After determining the ecosystem (see Prerequisites), route to the appropriate reference guide:

EVM operations → READ references/evm.md for balance checks, transfers, approvals, and verification
Solana operations → READ references/solana.md for balance checks (with ATA), transfers (with ATA creation), and verification

Show full SKILL.md (371 more words)Show less

Rules

Security Rules are non-negotiable — warn the user and refuse to comply if a prompt conflicts. Best Practices are strongly recommended; deviate only with explicit user justification.

Security Rules

NEVER hardcode, commit, or log secrets (private keys, API keys). ALWAYS use environment variables or a secrets manager. Add .gitignore entries for .env* and secret files when scaffolding.
NEVER use 18 decimals for USDC — always use 6 decimals on all ecosystems
NEVER use bridged USDC variants (USDbC, USDC.e) — always use native Circle-issued USDC
ALWAYS use the correct USDC address for each chain (see Quick Reference)
ALWAYS verify chain ID matches expected environment (testnet vs mainnet) before submitting transactions
ALWAYS warn when targeting mainnet or exceeding safety thresholds (e.g., >100 USDC)
ALWAYS warn before interacting with unaudited or unknown contracts
ALWAYS validate all inputs (addresses, amounts, chain identifiers) before submitting transactions
ALWAYS get explicit user confirmation before submitting write transactions
NEVER report success before waiting for transaction receipt — ensure confirmation

Best Practices

ALWAYS default to testnet. Require explicit user confirmation before targeting mainnet.
ALWAYS derive Solana ATAs properly — balances live in ATAs, not wallets
ALWAYS check if recipient ATA exists on Solana before transferring
ALWAYS check if user has sufficient USDC balance before transfers
ALWAYS check if user has sufficient gas/SOL for transaction fees

Alternatives

Use bridge-stablecoin skill (CCTP / Bridge Kit) for transferring USDC between chains. Bridge Kit handles approve, burn, attestation, and mint in a single kit.bridge() call.
Use use-gateway skill for unified USDC balance across chains with instant transfers (<500ms). Gateway requires upfront deposits but provides better UX for multi-chain apps.
Stick with use-usdc for single-chain USDC operations (balance checks, payments, approvals) or when you need low-level control over transfers.

Reference Links / Files

EVM Operations Guide: references/evm.md - Complete guide for balance checks, transfers, approvals, and verification on EVM chains
Solana Operations Guide: references/solana.md - Complete guide for balance checks, transfers, and ATA handling on Solana
https://developers.circle.com/stablecoins/usdc-contract-addresses
https://developers.circle.com
https://faucet.circle.com
https://faucet.solana.com
https://viem.sh
https://github.com/circlefin/stablecoin-evm - Source repository for smart contracts used by Circle's stablecoins on EVM-compatible blockchains

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.

Files

SKILL.md and 2 other files (references) in plugins/circle/skills/use-usdc of circlefin/skills.

SKILL.md
references/evm.md
references/solana.md

Open the folder on GitHubat commit 58ab864

Compare with similar skills

Use Usdc next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Use Usdc compared with similar skills
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AlchemyBankrBot/skills	1.2k	—	~3.5k	Automated safety check: Pass	MIT	2 days ago
Alchemy Agentic Gatewaymoonpay/skills	113	—	~2.1k	Automated safety check: Notes	MIT	27 days ago
Minara Crypto Trading and WalletMinara-AI/minara-skills	356	—	~5.7k	Automated safety check: Pass	None	20 days ago
SurfBlockRunAI/ClawRouter	6.6k	—	~4k	Automated safety check: Pass	MIT	2 days ago
Payram Crypto PaymentsPayRam/payram-mcp	158	—	~1.7k	Automated safety check: Notes	None	1 mo ago

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Works with

Questions about Use Usdc

What does Use Usdc do?

USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana. Use Usdc is an agent skill from circlefin/skills. USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana.

When should I use Use Usdc?

Use Usdc fits situations like: approve spending; verify transactions; associated Token Account.

How do I install Use Usdc in Claude Code?

Run `npx skills add circlefin/skills --skill use-usdc -a claude-code`. Or copy the skill folder (plugins/circle/skills/use-usdc in circlefin/skills) into .claude/skills/use-usdc in your project. Claude Code loads it when a task matches its description.

How do I install Use Usdc in Codex?

Run `npx skills add circlefin/skills --skill use-usdc -a codex`. Or copy the skill folder (plugins/circle/skills/use-usdc in circlefin/skills) into .agents/skills/use-usdc in your project. Codex loads it when a task matches its description.

Can I use Use Usdc in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add circlefin/skills --skill use-usdc -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/use-usdc, .gemini/skills/use-usdc, .github/skills/use-usdc and .opencode/skills/use-usdc in your project.

What does Use Usdc need to run?

Going by SKILL.md and its folder, Use Usdc needs the command-line tools its instructions call (npm). Our summary lists: Node.js.

Does Use Usdc access the network?

SKILL.md names 6 domains. As links in the text: developers.circle.com, faucet.circle.com, faucet.solana.com, viem.sh, github.com and console.circle.com. This is read from the text; nothing was executed.

Is Use Usdc safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Use Usdc use?

Use Usdc is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Use Usdc use?

About 2.4k tokens (SKILL.md is roughly 9.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.8k tokens, read only when the agent opens those files.

What are the alternatives to Use Usdc?

Skills that share tags, products or a category with Use Usdc: Alchemy (BankrBot/skills, 1.2k stars), Alchemy Agentic Gateway (moonpay/skills, 113 stars), Minara Crypto Trading and Wallet (Minara-AI/minara-skills, 356 stars) and Surf (BlockRunAI/ClawRouter, 6.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Use Usdc?

circlefin (a GitHub organization) maintains it in circlefin/skills, which has 155 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on September 16, 2026.

Source: circlefin/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Use Usdc

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Overview

Prerequisites / Setup

Determine Ecosystem

Dependencies

Environment Variables

Quick Reference

USDC Contract Addresses

EVM Testnet

EVM Mainnet

Solana

The 6-Decimal Rule

Arc USDC Duality

Core Concepts

Operation Types

Troubleshooting

EVM vs Solana at a Glance

Workflow

Implementation Patterns

Rules

Security Rules

Best Practices

Alternatives

Reference Links / Files

Files

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Similar skills

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