Hands-on seller lab
Goal: Complete all 6 go-live steps on preview.ipay.sh.
This lab uses preview.ipay.sh + Solana Devnet + Devnet USDC. Production later uses ipay.sh + Solana Mainnet + real USDC.
Start here: x402-seller-lab-express — not x402-seller-starter (Rust; same idea, different repo).
Full steps: repo README.md.
Lab ↔ preview.ipay.sh
| preview.ipay.sh | README section |
|---|---|
| 1 — API returns 402 | A → B → C |
| 2 — Preview vault | Skip |
| 3 — Activate (self-provision) | D |
| 4 — Register shop | D |
| 5 — Add API | D |
| 6 — Verify 402 | automatic |
Done when step 6 passes and you appear in #directory.
Why Activate (step 3)?
One wallet signature (~0.1 SOL) creates your on-chain payment vault before the first sale.
- You: pr402 Facilitator charges 90 bps protocol fee (sovereign) vs 100 bps if you skip and wait for JIT provision on first payment
- pr402: no vault-creation cost bundled into a buyer's first settle
Self-provision is the win-win path pr402 is designed around.
Quick path
A — Phantom or Solflare browser extension → Devnet + SOL (faucet)
B — npm install → .env → enrich + dev → verify-402 localhost → PASS
C — deploy to public https (any host; Vercel example in repo) → enrich again → verify-402 live → PASS
D — preview.ipay.sh: Activate → Register → resources → wait for step 6
E — copy 3 files into your real project (repo README)