Executive Summary
REAPP is an open-source Stellar-native agentic payment rail — the missing infrastructure layer connecting Google AP2 authorization, x402 HTTP settlement, and Soroban policy enforcement into a composable SDK.
The Problem in One Sentence
AI agents can currently act on behalf of users — but they cannot pay on behalf of users without either holding private keys (custodial risk) or requiring human approval for every transaction (defeating the point of automation).
REAPP solves this with a three-component architecture: AP2 mandates express what the agent is allowed to spend and where, Soroban smart accounts enforce those limits on-chain without custody, and x402 on Stellar executes settlement in 2–5 seconds at $0.00001 per transaction.
What REAPP Is
An open-source Stellar-native SDK that enables AI agents to make bounded, auditable USDC payments without holding user private keys. Three open standards composed into a developer-first package: Google AP2 for authorization, x402 for HTTP-native settlement, Soroban for on-chain policy enforcement.
The implementation is adapter-first by design — all AP2-specific logic lives behind a versioned interface that can be swapped as the spec evolves or if a competing standard wins the agentic payments market.
The Honest Context
The agentic payments standard war is not resolved. Google AP2 launched September 2025 with 60+ institutional partners. OpenAI and Stripe launched ACP in February 2026 targeting traditional payment rails — no blockchain path. REAPP bets on AP2. The adapter-first architecture is the hedge.
The team is two engineers and 800 hours over five months. The timeline is tight. There is no formal smart contract audit in the budget. These are acknowledged tradeoffs, not oversights. The proposal's strengths — architecture clarity, the genuine ecosystem gap, Alex Astrum's AP2 insider knowledge, Stellar fit — are real and durable regardless of how the standards war resolves.
Competitive Position
| Project | AP2 | Stellar | Non-custodial | x402 | Gap |
|---|---|---|---|---|---|
| Coinbase AgentKit | ✗ | ✗ | ✗ | ✗ | EVM only, custodial model |
| Skyfire | ✗ | ✗ | Partial | ✗ | EVM (Base), no Stellar |
| Nevermined | ✗ | ✗ | ✓ | ✗ | No Soroban, no AP2 |
| x402stellar | ✗ | ✓ | ✓ | ✓ | Payment rail only — no mandate layer |
| REAP Protocol | ✗ | ✗ | Partial | Partial | EVM testnets, different scope |
| REAPP | ✓ | ✓ | ✓ | ✓ | — |
The Team
- →Built ADK tooling from inside Google
- →Owns SDK architecture, CLI, docs, DX
- →AP2 insider knowledge — strongest asset
- →Direct access to AP2 spec authors
- →Leads Soroban contracts and reference agents
- →x402stellar integration experience
- →Agentic systems architecture
- →TypeScript and Rust development
- →Governance at NEAR NDC ($21M+ fund)
- →Milestone execution and coordination
- →Early adoption and partnerships
- →Community builder program