01 Wallie ยท Solana Agentic Payments An allowance for your agent. An agent can send a payment in milliseconds. But who decides how much it spends, which sellers it trusts, and when a retry loop should stop? Wallie puts an allowance in front of the payment. It's an open-source runtime for agents that buy data, compute, and services over x402. This submission brings that runtime to Solana. --- 02 The problem A wallet balance is not a spending policy. A funded wallet tells an agent what it can afford. It doesn't tell it what it's allowed to spend. Wallie checks the destination, the price of each call, the rate of spending, and the allowance that's left, all before it signs. An operator can pause everything with a kill switch. These limits cover the payments Wallie routes, not some unrelated cloud bill. --- 03 Two ways to pay A fixed price. Or a metered ceiling. There are two ways to pay. Exact is a fixed price for a single API call. Up-to opens a Solana payment channel with a ceiling you approve, then settles only what the request actually uses. Our public devnet run deposited ten cents, charged three, and returned seven. The transaction is finalized and linked from this page, so judges can check it straight on Solana. --- 04 The accounting challenge Locked money is still committed money. Money sitting in a channel isn't free to spend again. Wallie counts it as escrow. The budget, the ledger, the dashboard, and the agent tools all read the same channel records. If a receipt goes missing, recovery keeps the payment in the history. If the outcome is unclear, the deposit stays held. A corrupt state file stops new spending instead of quietly resetting the allowance. --- 05 Built for agents and sellers One runtime. A visible payment history. Developers reach it through the SDK, the command line, or the MCP server. The included example drives the real MCP protocol: it buys an exact API on the local practice rail, makes a metered Solana request offline, and hits a spending limit on purpose. The offline demo needs no keys. A separate devnet canary proves the on-chain metered path. Sellers get payment middleware and a worker that cleans up abandoned channels. --- 06 Run it. Inspect it. A small payment. A complete audit trail. This submission ships the source, a repeatable local demo, regression tests, a full walkthrough, and a public devnet transaction. The evidence keeps local simulation separate from real settlement, and it doesn't claim Solana mainnet as tested production traffic. Start with the demo, read the ledger, and follow the explorer link. Wallie gives an agent room to act while keeping every payment inside the allowance its operator set.