# TrustLine > Revenue-underwritten, uncollateralized USDC credit for AI agents on Stellar. ## Docs - [Architecture](https://docs.0xtrustline.online/architecture.md): How the contracts, backend, SDK, and frontend fit together. - [Contract addresses](https://docs.0xtrustline.online/contracts.md): Deployed Soroban contract IDs on Stellar testnet, and why score_registry never moves. - [How the credit engine works](https://docs.0xtrustline.online/credit-engine.md): A ground-truth technical walkthrough of the whole underwriting pipeline — revenue discovery, the Sybil tracker, scoring, and the on-chain lending vault. - [Getting started](https://docs.0xtrustline.online/index.md): Revenue-underwritten, uncollateralized USDC credit for AI agents on Stellar. - [Onboarding kit](https://docs.0xtrustline.online/onboarding-kit.md): How a real, external AI agent gets a funded testnet Stellar account and runs its first credit loop against TrustLine. - [Roadmap](https://docs.0xtrustline.online/roadmap.md): What's shipped and live on testnet, what's in progress, and the honest gap analysis. - [Scoring methodology](https://docs.0xtrustline.online/scoring-methodology.md): The composite revenue-coverage score, in brief. - [SDK reference (JavaScript / TypeScript)](https://docs.0xtrustline.online/sdk-reference.md): The @trustline-agents/agent-sdk API — construct an agent, underwrite, borrow, repay, and pay-with-credit. - [SDK reference (Python)](https://docs.0xtrustline.online/sdk-reference-python.md): The trustline-agent-sdk Python API — the same revenue-underwritten credit lifecycle, pip-installable. - [Sybil / independence model](https://docs.0xtrustline.online/sybil-model.md): Why independence is the moat — the threat model, the v1 scoring model, and what it does not yet solve. - [What & why](https://docs.0xtrustline.online/what-and-why.md): The problem TrustLine solves, the thesis, and why Stellar.