A software development kit for building non-custodial wallets that support multiple blockchain networks. Non-custodial means the wallet application, rather than a third party, controls the keys.

Use it when developing wallets for Bitcoin, EVM networks, Solana, Spark, TON, or Tron, including related token and transaction features described in its documentation.

It gives wallet projects shared interfaces and modules for different chains and protocols.

wdk — Skill for Claude Code and Codex by tetherto

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add tetherto/wdk-agent-skills --skill wdk

Clone the repo

git clone --depth 1 https://github.com/tetherto/wdk-agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tetherto/wdk-agent-skills/wdk/github.svg)](https://agentmods.dev/skills/tetherto/wdk-agent-skills/wdk)

Your own site

<a href="https://agentmods.dev/skills/tetherto/wdk-agent-skills/wdk"><img src="https://agentmods.dev/badge/skills/tetherto/wdk-agent-skills/wdk/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/tetherto/wdk-agent-skills/wdk"><img src="https://agentmods.dev/badge/skills/tetherto/wdk-agent-skills/wdk.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 187 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,993 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00187	$0.03993
Opus 5	$0.00093	$0.01997
Sonnet 5	$0.00037	$0.00799
Haiku 4.5	$0.00019	$0.00399

Measured 10d ago against content hash a306f4aa6771, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade B, and why

wdk scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Instruction-override phrasingmediumPrompt injection

Text telling the model to disregard its earlier instructions or safety rules is the shape of a prompt injection, whoever wrote it.

2. Contains injection markers ("ignore previous instructions", "system override", "admin mode", "you are now in...")

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

skills/wdk/SKILL.md · 317 lines

How it starts

The opening of the file, as written. The whole thing — 317 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tether WDK

Multi-chain wallet SDK. All modules share common interfaces from @tetherto/wdk-wallet.

Documentation

Official Docs: https://docs.wallet.tether.io GitHub: https://github.com/tetherto/wdk

URL Fetching Workflow

Identify relevant URLs from the reference files in references/
web_fetch the URL directly
If fetch fails → web_search the exact URL first (unlocks fetching) → then web_fetch again

Each module doc page has subpages: /usage, /configuration, /api-reference

Reference Files

This skill is organized into reference files for chain-specific and protocol-specific details:

File	Content
`references/chains.md`	Chain IDs, native tokens, units, decimals, dust thresholds, address formats, EIP-3009 support, bridge routes
`references/deployments.md`	USDT native addresses, USDT0 omnichain addresses, public RPC endpoints
`references/wallet-btc.md`	Bitcoin wallet: BIP-84, Electrum, PSBT, fee rates
`references/wallet-evm.md`	EVM + ERC-4337: BIP-44, EIP-1559, ERC20, batch txs, paymaster
`references/wallet-solana.md`	Solana: Ed25519, SPL tokens, lamports
`references/wallet-spark.md`	Spark: Lightning, key tree, deposits, withdrawals
`references/wallet-ton.md`	TON + TON Gasless: Jettons, nanotons, paymaster
`references/wallet-tron.md`	TRON + TRON Gasfree: TRC20, energy/bandwidth, gasFreeProvider
`references/protocol-swap.md`	Velora EVM swap protocol
`references/protocol-bridge.md`	USDT0 cross-chain bridge via LayerZero
`references/protocol-lending.md`	Aave V3 lending: supply/withdraw/borrow/repay
`references/protocol-fiat.md`	MoonPay fiat on/off ramp

When a task targets a specific chain or protocol, read the relevant reference file(s) before writing code.

Architecture

@tetherto/wdk               # Orchestrator - registers wallets + protocols
    ├── @tetherto/wdk-wallet    # Base classes (WalletManager, IWalletAccount)
    │   ├── wdk-wallet-btc      # Bitcoin (BIP-84, SegWit)
    │   ├── wdk-wallet-evm      # Ethereum & EVM chains
    │   ├── wdk-wallet-evm-erc-4337  # EVM with Account Abstraction
    │   ├── wdk-wallet-solana   # Solana
    │   ├── wdk-wallet-spark    # Spark/Lightning
    │   ├── wdk-wallet-ton      # TON
    │   ├── wdk-wallet-ton-gasless   # TON gasless
    │   ├── wdk-wallet-tron     # TRON
    │   └── wdk-wallet-tron-gasfree  # TRON gas-free
    └── Protocol Modules
        ├── wdk-protocol-swap-velora-evm   # DEX swaps on EVM
        ├── wdk-protocol-bridge-usdt0-evm  # Cross-chain USDT0 bridge
        ├── wdk-protocol-lending-aave-evm  # Aave V3 lending
        └── wdk-protocol-fiat-moonpay      # Fiat on/off ramp

Read the full file on GitHub · 317 lines

Files

What ships with it

13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 317 lines · 187 tokens per session scan B a306f4aa6771

Subscribe to this mod's changes

wdk is a skill published in the GitHub repository tetherto/wdk-agent-skills (2 stars, last pushed 7d ago), licensed Apache-2.0. It adds 187 tokens to every session and 3,993 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it B with 1 finding (instruction-override phrasing). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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