Agent skill

Erc20

Query and transfer ERC-20 tokens using Nethereum's built-in typed services (.NET/C).

Install Erc20

skills CLI

$ npx skills add Nethereum/Nethereum --skill erc20 -a claude-code

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

GitHub CLI

$ gh skill install Nethereum/Nethereum erc20 --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/Nethereum/Nethereum.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/nethereum-skills/skills/erc20 .claude/skills/erc20 && 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 "erc20" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20 into .claude/skills/erc20/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "erc20", 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/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20

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 Nethereum/Nethereum --skill erc20 -a codex

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

GitHub CLI

$ gh skill install Nethereum/Nethereum erc20 --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/nethereum-skills/skills/erc20 .agents/skills/erc20 && 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 "erc20" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20 into .agents/skills/erc20/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "erc20", 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 Nethereum/Nethereum --skill erc20 -a cursor

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

GitHub CLI

$ gh skill install Nethereum/Nethereum erc20 --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/nethereum-skills/skills/erc20 .cursor/skills/erc20 && 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 "erc20" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20 into .cursor/skills/erc20/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "erc20", 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/Nethereum/Nethereum.git --path plugins/nethereum-skills/skills/erc20

--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 Nethereum/Nethereum --skill erc20 -a gemini-cli

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

GitHub CLI

$ gh skill install Nethereum/Nethereum erc20 --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/Nethereum/Nethereum.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/nethereum-skills/skills/erc20 .gemini/skills/erc20 && 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 "erc20" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20 into .gemini/skills/erc20/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "erc20", 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 Nethereum/Nethereum erc20

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 Nethereum/Nethereum --skill erc20 -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/nethereum-skills/skills/erc20 .github/skills/erc20 && 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 "erc20" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20 into .github/skills/erc20/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "erc20", 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 Nethereum/Nethereum --skill erc20 -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 Nethereum/Nethereum erc20 --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/nethereum-skills/skills/erc20 .opencode/skills/erc20 && 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 "erc20" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/erc20 into .opencode/skills/erc20/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "erc20", 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: erc20
GitHub stars: 2.3k
Token cost: ~1.1k tokens
SKILL.md length: 316 words
Files: 1
Skills in repo: 71
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Query and transfer ERC-20 tokens using Nethereum's built-in typed services (.NET/C).

The user asks about ERC-20 tokens
SKILL.md covers Get the Service, Query Token Info, Check Balance and Transfer Tokens, plus 4 more sections
Calls dotnet
Token transfers

What it does

Erc20 is an agent skill from Nethereum/Nethereum. Query and transfer ERC-20 tokens using Nethereum's built-in typed services (.NET/C). Use this skill whenever the user asks about ERC-20 tokens, token balances, token transfers, token approvals, allowances, token metadata (name, symbol, decimals), or any fungible token interaction with C or .NET.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs. It works with Ethereum, C# and .NET. The repository describes itself as: Ethereum .Net cross platform integration library. The licence is MIT.

When your agent uses it

The user asks about ERC-20 tokens
Token transfers
Token approvals
Token metadata (name

Example prompts

“/erc20”

What it can do on your machine

Read from SKILL.md and the folder at commit 229f278. 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:
- dotnet
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):
- docs.nethereum.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

Erc20 loads about 1.1k tokens when it runs. Until then it costs about 76 tokens; SKILL.md has 316 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~76
When it runs · the whole SKILL.md, loaded when a task matches: ~1.1k

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 passed

The automated check found no risky patterns in SKILL.md.

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 Nethereum/Nethereum at commit 229f278, republished under its MIT licence (© Nethereum). 316 words, ~1,116 tokens.

Download SKILL.mdSave it as .claude/skills/erc20/SKILL.md (or your agent's skills folder).

name: erc20
description: Query and transfer ERC-20 tokens using Nethereum's built-in typed services (.NET/C#). Use this skill whenever the user asks about ERC-20 tokens, token balances, token transfers, token approvals, allowances, token metadata (name, symbol, decimals), or any fungible token interaction with C# or .NET.
user-invocable: true

ERC-20 Tokens

Nethereum has a built-in typed service for ERC-20 — no ABI needed, no code generation. Just get the service for any token contract address and call methods directly. This is the simplest way to interact with fungible tokens.

NuGet: Nethereum.Web3

bash

dotnet add package Nethereum.Web3

Get the Service

All ERC-20 operations start by getting a typed service for the token's contract address:

csharp

var erc20 = web3.Eth.ERC20.GetContractService(contractAddress);

Query Token Info

Every ERC-20 token exposes metadata. These are read-only calls — no gas, no signing needed:

csharp

var name = await erc20.NameQueryAsync();
var symbol = await erc20.SymbolQueryAsync();
var decimals = await erc20.DecimalsQueryAsync();
var totalSupply = await erc20.TotalSupplyQueryAsync();

The decimals value matters — ERC-20 tokens store balances as integers in the smallest unit. Most tokens use 18 decimals, but stablecoins like USDC use 6. Always use Web3.Convert.FromWei(value, decimals) to display human-readable amounts.

Check Balance

Balances are returned in the token's smallest unit. Use FromWei with the token's decimals for a readable value:

csharp

var balance = await erc20.BalanceOfQueryAsync(myAddress);
Console.WriteLine($"Balance: {Web3.Convert.FromWei(balance, decimals)} {symbol}");

Transfer Tokens

Transfers require a Web3 instance connected with a funded account. The amount must be in the smallest unit — use ToWei with the token's decimals:

csharp

var receipt = await erc20.TransferRequestAndWaitForReceiptAsync(
    recipientAddress,
    Web3.Convert.ToWei(100, decimals));

Gas estimation, nonce, and EIP-1559 fees are handled automatically.

Approve and TransferFrom

The approve/transferFrom pattern lets another address (like a DEX or smart contract) spend your tokens. First approve a spending limit, then the spender calls transferFrom:

csharp

// Approve the spender
var approveReceipt = await erc20.ApproveRequestAndWaitForReceiptAsync(
    spenderAddress,
    Web3.Convert.ToWei(1000, decimals));

// Check allowance
var allowance = await erc20.AllowanceQueryAsync(myAddress, spenderAddress);

Be careful with approvals — approving a large amount gives the spender permission to transfer up to that amount at any time.

Listen for Transfer Events

ERC-20 transfers emit a Transfer event. Nethereum ships a built-in TransferEventDTO so you don't need to define your own:

csharp

using Nethereum.Contracts.Standards.ERC20.ContractDefinition;

var transferEvent = web3.Eth.GetEvent<TransferEventDTO>(contractAddress);
var filter = transferEvent.CreateFilterInput(
    BlockParameter.CreateEarliest(),
    BlockParameter.CreateLatest());

var transfers = await transferEvent.GetAllChangesAsync(filter);
foreach (var t in transfers)
{
    Console.WriteLine($"{t.Event.From} -> {t.Event.To}: {Web3.Convert.FromWei(t.Event.Value, decimals)}");
}

Historical Queries

All query methods accept an optional BlockParameter to read state at a specific block. The node must have archive state for the requested block:

csharp

var historicalBalance = await erc20.BalanceOfQueryAsync(
    myAddress,
    new BlockParameter(15_000_000));

Available Methods

Method	Returns	Description
`NameQueryAsync()`	`string`	Token name
`SymbolQueryAsync()`	`string`	Token symbol
`DecimalsQueryAsync()`	`byte`	Decimal places
`TotalSupplyQueryAsync()`	`BigInteger`	Total supply in wei
`BalanceOfQueryAsync(address)`	`BigInteger`	Balance in wei
`AllowanceQueryAsync(owner, spender)`	`BigInteger`	Approved amount
`TransferRequestAndWaitForReceiptAsync(to, amount)`	`TransactionReceipt`	Transfer tokens
`ApproveRequestAndWaitForReceiptAsync(spender, amount)`	`TransactionReceipt`	Approve spending
`TransferFromRequestAndWaitForReceiptAsync(from, to, amount)`	`TransactionReceipt`	Transfer on behalf

For full documentation, see: https://docs.nethereum.com/docs/smart-contracts/erc20

Files

Just SKILL.md in plugins/nethereum-skills/skills/erc20 of Nethereum/Nethereum.

Open the folder on GitHubat commit 229f278

Compare with similar skills

Erc20 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.

Erc20 compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Erc20 this skillNethereum/Nethereum	2.3k	—	~1.1k	Automated safety check: Pass	MIT	2 days ago
.NET API Compatibility DesignAaronontheweb/dotnet-skills	1.2k	2 repos	~2.7k	Automated safety check: Pass	MIT	20 days ago
Tsp Csharpquerylenshq/ef-querylens	225	—	~1.3k	Automated safety check: Pass	MIT	1 mo ago
XML DocumentationVonage/vonage-dotnet-sdk	118	—	~2.7k	Automated safety check: Pass	Apache-2.0	3 mo ago
Dotnet 10 Csharp 14sketch7/FluentlyHttpClient	121	—	~2.2k	Automated safety check: Pass	MIT	19 days ago
DisCatSharp Discord DevelopmentAiko-IT-Systems/DisCatSharp	140	—	~1.2k	Automated safety check: Pass	MIT	2 days ago

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Works with

Questions about Erc20

What does Erc20 do?

Query and transfer ERC-20 tokens using Nethereum's built-in typed services (.NET/C). Erc20 is an agent skill from Nethereum/Nethereum.NET/C).

When should I use Erc20?

Erc20 fits situations like: the user asks about ERC-20 tokens; token transfers; token approvals; token metadata (name.

How do I install Erc20 in Claude Code?

Run `npx skills add Nethereum/Nethereum --skill erc20 -a claude-code`. Or copy the skill folder (plugins/nethereum-skills/skills/erc20 in Nethereum/Nethereum) into .claude/skills/erc20 in your project. Claude Code loads it when a task matches its description.

How do I install Erc20 in Codex?

Run `npx skills add Nethereum/Nethereum --skill erc20 -a codex`. Or copy the skill folder (plugins/nethereum-skills/skills/erc20 in Nethereum/Nethereum) into .agents/skills/erc20 in your project. Codex loads it when a task matches its description.

Can I use Erc20 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 Nethereum/Nethereum --skill erc20 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/erc20, .gemini/skills/erc20, .github/skills/erc20 and .opencode/skills/erc20 in your project.

What does Erc20 need to run?

Going by SKILL.md and its folder, Erc20 needs the command-line tools its instructions call (dotnet).

Does Erc20 access the network?

SKILL.md names 1 domain. As links in the text: docs.nethereum.com. This is read from the text; nothing was executed.

Is Erc20 safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Erc20 use?

Erc20 is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Erc20 use?

About 1.1k tokens (SKILL.md is roughly 4.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Erc20?

Skills that share tags, products or a category with Erc20: .NET API Compatibility Design (Aaronontheweb/dotnet-skills, 1.2k stars), Tsp Csharp (querylenshq/ef-querylens, 225 stars), XML Documentation (Vonage/vonage-dotnet-sdk, 118 stars) and Dotnet 10 Csharp 14 (sketch7/FluentlyHttpClient, 121 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Erc20?

Nethereum (a GitHub organization) maintains it in Nethereum/Nethereum, which has 2,260 GitHub stars. The repository holds 71 skills in this directory. The repository was last updated on October 5, 2026.

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

Install Erc20

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

ERC-20 Tokens

Get the Service

Query Token Info

Check Balance

Transfer Tokens

Approve and TransferFrom

Listen for Transfer Events

Historical Queries

Available Methods

Files

Compare with similar skills

Similar skills

More from Nethereum/Nethereum

Related

Questions about Erc20