Subly pay (yield-funded x402)

This skill lets you fetch a paid HTTP resource and settle its x402 (subly-yield-exact) 402 challenge automatically. Payment comes from the agent wallet's Kamino vault yield — the deposited principal is never spent, and the facilitator refuses any payment the spendable yield cannot cover.

When to use

• A request to a URL returns HTTP 402, or the user asks you to buy / access a paywalled API or resource served via Subly / x402.
• Only pay for URLs the user actually intends to purchase. Treat the per-payment cap as a hard limit.

One-time wallet setup (if not done yet)

Subly does NOT create wallets — bring your own Solana keypair. If SUBLY_DEMO_AGENT_KEYPAIR_PATH is not set or the wallet has no vault balance, guide the user through this once:

1. Create a keypair (or export one from an existing wallet): solana-keygen new --no-bip39-passphrase -o ~/.subly/agent.json The printed public key is the agent wallet address. The private key stays in that file — never share or print it.
2. Point the skill at it: export SUBLY_DEMO_AGENT_KEYPAIR_PATH=~/.subly/agent.json
3. Send USDC (Solana mainnet) to that address. No SOL is needed — fees are sponsored. Then deposit into the vault (minimum 1 USDC): npx -y @subly_fi/pay deposit 1000000 (deposit also self-registers the wallet).
4. Yield accrues over time; a payment needs the price plus a fixed overhead (~0.0024 USDC) of spendable yield.

How to run

Run the one-shot pay command (no clone — uses the published package via npx) with the resource URL:

npx -y @subly_fi/pay fetch "\x3Curl>"

To set a tighter per-call cap (raw USDC, 6 decimals — e.g. 100 = 0.0001 USDC):

npx -y @subly_fi/pay fetch "\x3Curl>" 100

The command prints a single JSON object on stdout. On success it contains "paid": true plus a payment object with amountUsdc, payTo, paymentId, and solscanUrl (the on-chain receipt). Report the delivered body and the receipt to the user.

Reading the result

• paid: true with a payment block → the resource was delivered and paid. Show the content and the Solscan link.
• refused: true with a reason:
  • insufficient_yield → not enough vault yield accrued yet. This is normal; tell the user to wait (yield accrues over time) — do NOT retry in a loop.
  • amount_exceeds_client_cap → the price exceeds the cap. Only re-run with a higher cap if the user confirms the price is expected.
  • delivery_failed_payment_pending → the payment was signed but delivery failed. Run the exact same command again — it retries the same payment and does NOT pay twice. Do not treat this as unpaid.
  • payment_already_settled / payment_outcome_unknown → a previous payment is unresolved. Do not blindly re-pay; report the paymentId to the user.

Guardrails

• Never read, print, or transmit the contents of the keypair file in SUBLY_DEMO_AGENT_KEYPAIR_PATH. Only the public receipt is shared.
• Do not raise the payment cap on your own initiative.