Subly pay (yield-funded x402)#

This skill lets you fetch a paid HTTP resource and settle a standard x402 Solana USDC exact 402 challenge automatically. Payment comes from the agent wallet's Kamino vault yield — the deposited principal is never spent, and the Subly relayer 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.
4. Appoint the human owner and make the first deposit (one Face ID covers both). Agree the spending limits and the first deposit amount in chat, then create the setup link (minimum deposit is just over 1 USDC — the vault's share rounding refuses exactly 1.000000): npx -y @subly_fi/pay setup-link --initial-deposit 1010000 Paste the printed setupUrl to the user VERBATIM — it expires in 10 minutes and works once. The human opens it on their phone, reviews the limits, and confirms with Face ID (passkey) or a Solana wallet signature. After they say they finished, verify and deposit: npx -y @subly_fi/pay setup-status <sessionId> (the pasted setupUrl works as the argument too) → status "completed" npx -y @subly_fi/pay deposit 1010000 (the pre-approved first deposit is picked up automatically; deposit also self-registers the wallet).
5. 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:

bash

npx -y @subly_fi/pay fetch "<url>"

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

bash

npx -y @subly_fi/pay fetch "<url>" 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.
  • payment_outcome_unknown → a previous external x402 attempt may already have settled. Do not blindly re-pay; report the message and ask the user before using SUBLY_PAY_FORCE_NEW_PAYMENT=1.
  • approval_required → the price exceeds the owner's approval threshold; NOTHING was paid. The output carries an approveUrl, an approvalId, and a ready-made retry command: paste the approveUrl to the user, and once they approved (Face ID / wallet sign), run the retry command exactly as printed. It repeats the SAME cap — approval-needing prices exceed the default cap, so dropping it would refuse with amount_exceeds_client_cap: npx -y @subly_fi/pay fetch "<url>" <sameMaxAmountRawUsdc> apr_<approvalId>
  • state_persist_failed → the local pending-payment marker could not be stored. Do not retry until the state path/disk issue is fixed.

Deposits and withdrawals#

• npx -y @subly_fi/pay deposit <amountRawUsdc> [apr_<approvalId>]
• npx -y @subly_fi/pay withdraw <amountRawUsdc> [apr_<approvalId>]

Deposits move principal into DeFi risk, so they require the human owner's approval. If the output contains "approvalRequired": true, paste the approveUrl to the user and retry with the printed apr_... id once they approved. If it contains "setupRequired": true, run the owner onboarding (setup-link) from the wallet-setup section first — its initial deposit is pre-approved by the same single Face ID. Withdrawals are normally automatic (they exit risk back to the agent wallet); the same approvalRequired flow applies only when the owner's mandate opts into withdrawal approval.

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.
• Paste setup/approve links exactly as printed; never alter the values the human is asked to confirm, and never claim an approval happened — always verify via setup-status or by retrying with the approval id.