standards

What this skill does

# Standards, Ecosystem, and Resources

Three things bundled because they're all reference material you reach for in the same moment: "which standard handles X?", "is there an existing project doing Y?", and "where's the canonical doc for Z?".

## When to use this skill
- Picking the right SEP for an integration (anchors, deposits, federation, deep links, KYC, paths)
- Checking CAP status for a protocol feature you want to rely on
- Finding existing DeFi protocols, wallets, or infrastructure to integrate with rather than rebuild
- Locating official docs, SDKs, or community resources

## Related skills
- Implementing a SEP-41 token interface → `../assets/SKILL.md`, `../soroban/SKILL.md`
- Frontend SEP-7 / SEP-10 flows → `../dapp/SKILL.md`
- CAPs for cryptography (BLS, BN254, Poseidon) → `../zk-proofs/SKILL.md`
- x402/MPP protocol context → `../agentic-payments/SKILL.md`

---

# Part 1: SEP / CAP Standards Reference


## When to use this guide
Use this when you need:
- The right SEP/CAP for a feature or integration
- Interoperability guidance for wallets, anchors, and contracts
- A fast map from use case to official standards docs

## Maintenance note
Standards status can change quickly.
Before implementation, verify current status in:
- SEPs: [stellar-protocol/ecosystem](https://github.com/stellar/stellar-protocol/tree/master/ecosystem)
- CAPs: [stellar-protocol/core](https://github.com/stellar/stellar-protocol/tree/master/core)

Treat this file as a routing map, not a source of final governance/status truth.

## High-value SEPs for app developers

### Contracts and token interfaces
- [SEP-0041](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0041.md): Soroban token interface
- [SEP-0046](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0046.md): Contract metadata in Wasm
- [SEP-0048](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0048.md): Contract interface specification
- [SEP-0049](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0049.md): Upgradeable-contract guidance
- [SEP-0050](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0050.md): NFT standard work
- [SEP-0055](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0055.md): Contract build verification
- [SEP-0056](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0056.md): Vault-style tokenized products
- [SEP-0057](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0057.md): Regulated token patterns (T-REX)

### Auth, identity, and metadata
- [SEP-0010](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0010.md): Web authentication
- [SEP-0023](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0023.md): StrKey encoding
- [SEP-0001](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0001.md): `stellar.toml`

### Anchor and fiat integration
- [SEP-0006](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0006.md): Programmatic deposit/withdrawal API
- [SEP-0024](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0024.md): Hosted interactive anchor flow
- [SEP-0031](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0031.md): Cross-border payment flow
- [SEP-0012](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0012.md): KYC data exchange

## High-value CAPs for Soroban developers

### Soroban foundations
- [CAP-0046](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0046.md): Soroban overview
- CAP-0046 subdocuments (`cap-0046-*.md`): runtime, lifecycle, host functions, storage, auth, metering

### Frequently used contract capabilities
- [CAP-0051](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0051.md): secp256r1 verification (passkey-related cryptography)
- [CAP-0053](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0053.md): TTL extension behavior
- [CAP-0058](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0058.md): constructors (`__constructor`)
- [CAP-0059](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0059.md): BLS12-381 primitives
- [CAP-0067](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0067.md): protocol/runtime improvements including asset/event model changes

### Newer and draft crypto/features
- [CAP-0074](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0074.md): BN254 host functions proposal
- [CAP-0075](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0075.md): Poseidon/Poseidon2 proposal
- [CAP-0079](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0079.md): muxed-address strkey conversion proposal

Use the CAP preamble status fields as the source of truth for implementation readiness.

## Quick mapping by use case

### I am building a fungible token
1. Start with SEP-0041 interface expectations.
2. Prefer Stellar Assets + SAC interop unless custom logic is required.
3. If regulated, review SEP-0057 patterns.

### I need upgrade-safe contracts
1. Read SEP-0049 guidance for upgrade process design.
2. Use CAP-0058 constructors for atomic initialization where protocol support exists.
3. Add migration/versioning strategy before deploying upgradeable contracts.

### I am building a smart-wallet flow
1. Use SEP-0010 for web authentication flows.
2. Review CAP-0051 for passkey-related cryptographic primitives.
3. Align wallet UX and signing payloads with current SDK guidance.

### I need anchor integration for fiat rails
1. SEP-0006 for API-first flows.
2. SEP-0024 for hosted interactive rails.
3. SEP-0031 when supporting payment corridors.
4. SEP-0012 for KYC data requirements.

## Practical workflow for AI agents
- Step 1: Identify feature category (token, wallet auth, anchor, upgradeability).
- Step 2: Link user to the 1-3 primary SEP/CAP docs.
- Step 3: Check status/acceptance in the source repo before asserting support.
- Step 4: Implement only what is active on the target network/protocol.
- Step 5: Document dependencies on draft standards explicitly.

## Related docs
- Contract implementation details: [`../soroban/SKILL.md`](../soroban/SKILL.md)
- Advanced architecture guidance: [`../soroban/SKILL.md`](../soroban/SKILL.md)
- RPC and data access: [`../data/SKILL.md`](../data/SKILL.md)
- Security considerations: [`../security/SKILL.md`](../security/SKILL.md)

---

# Part 2: Stellar Ecosystem


This guide catalogs the major projects, protocols, and tools in the Stellar ecosystem. Use this as a reference when building on Stellar to find relevant integrations, examples, and community projects.

> **Canonical directories** — For the most up-to-date project lists, check:
> - [Stellar Ecosystem](https://stellar.org/ecosystem) — Official directory (searchable by country, asset, category)
> - [SCF Projects](https://communityfund.stellar.org/projects) — Funded projects with status tracking
> - [Stellar on DefiLlama](https://defillama.com/chain/stellar) — Live DeFi TVL data
>
> Treat project metrics/status as volatile. Validate latest activity and production readiness before taking dependencies.

## DeFi Protocols

### Lending & Borrowing

#### Blend Protocol
Universal liquidity protocol enabling permissionless lending pools.
- **Use Case**: Lending, borrowing, yield generation
- **GitHub**: https://github.com/blend-capital/blend-contracts
- **GitHub (v2)**: https://github.com/blend-capital/blend-contracts-v2
- **Integrations**: Meru, Airtm, Lobstr, DeFindex, Beans

#### Slender
First non-custodial lending protocol on Soroban with flash loan support.
- **Use Case**: Lending, borrowing, flash loans
- **Features**: Pool-based strategy, sTokens, dTokens, utilization caps
- **Oracle**: SEP-40 compatible (Reflector)

### DEXs & AMMs

#### Soroswap
First DEX and aggregator on Stellar/Soroban.
- **Use Case**: Token swaps, liquidity provision, agg