Claude forCold Email Infrastructure.
Your agent can now buy the sending domain, wire SPF, DKIM and DMARC, create the inbox, send, and read what comes back. One balance, priced per call.
Why a sending domain used to take four vendors and a week, and what changes when your agent builds the stack itself. Every RouterGrowth price on this page is the live per-call price, September 2026.
$ Set up https://www.routergrowth.com/SKILL.md, then set up cold email infrastructure for acme: find a domain, register it, wire SPF, DKIM and DMARC, create an inbox and send me a test.
Sending one cold emailtakes four subscriptions.
No single vendor sells the whole path. So the setup gets spread across a registrar, a mailbox, a sender and a monitor, four logins, four invoices, before your agent sends anyone anything.
Buys all four. Hires the wiring.
Registrar to DNS to mailbox to sender to monitor. That chain is cold email infrastructure, and it used to cost four contracts and a week of someone's time.
Sends from the company domain. Burns it.
One deliverability problem on the domain your invoices go through, and the campaign costs you the company's email.
Cheapest paid tier of each vendor, public pricing September 2026, one domain and one mailbox. Warm-up is bundled in Instantly; MailReach is counted for spam tests and reputation monitoring.
Now your agentbuilds the stack.
Nothing to learn, nothing to wire. Describe the domain you want and Claude buys it, writes the records, checks them, opens the inbox and sends, paying only for the calls it made.
Buys the domain
Availability and price across TLDs, then the purchase, with you as the registrant and WHOIS privacy on.
domain.search → domain.registerWires the authentication
SPF, DKIM and DMARC come back as records. The agent writes them and re-checks until the domain reads verified.
email.domain → domain.dnsChecks before it sends
Re-checks are free. Nothing sends from a domain that has not verified.
email.domain · re-check · $0One balance
Registrar, DNS, mailbox and sending all bill the same prepaid balance. No seats, no contracts, no minimums.
eight calls · one receiptA run, step by step
Set up cold email infrastructure for acme: find a domain, register it, wire SPF, DKIM and DMARC, create an inbox and send me a test.
Prices are the live RouterGrowth per-call prices for each capability. The domain price is quoted from the registrar at run time (registrar price x 1.15 plus $3); the figure shown is a .com today. The domain and the inbox are placeholders.
Stop buying four seats.Stop wiring them.
$786 a year bought you four logins and a week of DNS. Claude builds the same stack for $22, most of it the domain itself, and then sends for $0.003 an email.
Replaces the stack.Keeps the sources.
Every name below is live on RouterGrowth today, priced per call, reachable from the same balance.
Go beyond infrastructure,without another account.
Add the list, the signal and the creative to the same balance whenever the campaign needs it.
What does each call cost?
Starting price per successful call, read from the catalog. /v1/inspect returns the exact figure before the run and reserves it against your balance; failures and unbilled no-matches release the hold in full.
| Capability | What it returns | From | Providers |
|---|---|---|---|
| domain.search | Check which domains are available and what they cost to register through RouterGrowth: a name across common TLDs, or one exact domain. | $0.002 |  |
| domain.register | Buy a domain for outbound sending. Registered in RouterGrowth's registrar account with you as the registrant contact; WHOIS privacy on; transferable to you on request. | $18 | |
| email.domain | Bring your own domain for outbound: registers it, returns the DNS records and a one-click setup link, and reports verification status. Run again to re-check. | $1.995 |  |
| domain.dns | Create DNS records on a domain registered through RouterGrowth: the records email.domain asks for, or anything else. | $0.002 | |
| email.inbox | Create (or fetch) a sending inbox owned by your organization, on the shared domain or on a domain you verified with email.domain. Idempotent per name. | $1.995 | |
| email.send | Send an email from one of your inboxes, or reply within a thread. You are the sender of record: consent and unsubscribe handling are yours. | $0.003 | |
| email.messages | Messages in one of your inboxes, newest first: replies, bounces and opens as labels. Poll it after a send. | $0.002 | |
FAQ
Who owns the domain?
Can I use a domain I already own?
Does the agent warm the domain up?
What does it cost after the setup?
More details
Cold email infrastructure, end to end
The whole sending stack as API calls: domain, DNS, authentication, inbox, send, and the replies coming back.
Outbound · 6 minFind high-intent leads
Companies that just posted the role you sell to, the person who owns the budget, and their verified email. Around two cents per finished contact.
Outbound · 6 minWaterfall email enrichment without the waterfall bill
The thing enrichment platforms charge a platform fee to orchestrate, as one call with one price and no credits to pre-buy.
Reading this as an agent? This launch as markdown: /launches/claude-for-cold-email-infrastructure.md · every guide and launch: /use-cases/llms.txt
Infrastructure used to need a week.Now it needs one line.
Start with $1 in free RouterGrowth credit.
$ Set up https://www.routergrowth.com/SKILL.md, then set up cold email infrastructure for acme: find a domain, register it, wire SPF, DKIM and DMARC, create an inbox and send me a test.