agentbuy

Let an autonomous agent pay a real-world crypto invoice. Exact amount, cross-chain, with no account, no API key and no KYC anywhere in the path.

npm install https://norravex.com/agentbuy-0.2.0.tgz @solana/web3.js

Served straight from this domain — no registry account involved, which is rather the point. MIT, 8 kB.

Or give your agent the capability directly (MCP)

Ships with an MCP server, so Claude Code, Claude Desktop or Cursor can quote and pay invoices as tools:

{
  "mcpServers": {
    "agentbuy": {
      "command": "npx",
      "args": ["-y", "https://norravex.com/agentbuy-0.2.0.tgz", "agentbuy-mcp"],
      "env": {
        "AGENTBUY_KEYPAIR": "/path/to/solana-keypair.json",
        "AGENTBUY_REFUND_AUTHORITY": "0xYourEvmAddress",
        "AGENTBUY_MAX_SOL": "0.5"
      }
    }
  }
}

Three tools: quote_invoice (never moves funds), pay_invoice, check_order. Paying refuses outright unless a keypair and a refund authority are configured, and always enforces AGENTBUY_MAX_SOL — default 0.25 SOL. Quote first, then decide.

const { payInvoice } = require("agentbuy");

await payInvoice({
  secretKey: "/path/to/solana-keypair.json",
  toChain: "ethereum",
  amount: "0.01008",        // the EXACT figure on the invoice
  recipient: "0x9579…",     // merchant's single-use address
  refundAuthority: "0x8a87…",
  maxPay: 0.35,             // refuse a bad quote
});

The problem

An agent holding SOL cannot pay an invoice denominated in ETH. It needs a cross-chain swap that lands an exact amount on an address it does not control.

That last part matters more than it sounds. Merchants taking crypto issue a single-use address and a precise figure. Underpay by a hair and it is not credited — you get a support ticket with a company that, by design, does not know who you are. So you must solve for the input, never the output.

The obvious fix is a swap aggregator. Every one of them wants an account.

Which routes actually work

Measured 2026-07-25, from a datacentre host, with no signups:

deBridge is the default route for that reason. The interface is provider-shaped, so another keyless route can be added without changing callers.

What it does for you

• Exact-output quoting — solves for input so the merchant gets the precise figure.
• Simulates before signing — an order that reverts still costs fees; one that fills to the wrong address is unrecoverable. There is no chargeback.
• Verifies the fee payer is your wallet before signing anything.
• maxPay guard — refuses to send if the quote comes back worse than you allowed.
• Waits for fulfilment, and throws if the order is cancelled rather than reporting success.

Provenance

Extracted from a working system that autonomously bought and configured a domain end to end — swap, invoice, registration, DNS, TLS, mail — with no card, no bank and no human in the loop. The routing table above is what survived that, not a survey.

The domain you are reading this on was bought that way.