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Mailgent
AI agents that can email, pay APIs, sign, and store secrets
Agents keep hitting the same walls: no inbox, no safe credential store, no way past a 2FA gate, no way to pay for a downstream API, no verifiable identity. Mailgent fixes this in one curl call. Every agent gets a real inbox (DKIM, threading), encrypted vault, TOTP/2FA, USDC wallet for x402-priced API payments, verifiable DID (Ed25519), and a calendar. MCP-native. Works with Claude, Cursor, OpenAI, LangChain, CrewAI, Hermes Agent, OpenClaw, NemoClaw, n8n, and more. Everything live in seconds.
Hey PH 👋 Danny here, maker of Mailgent.
Here's the problem that drove this: you build a capable agent, and it immediately hits a wall. No inbox. No safe place to store an API key. Can't get past a 2FA prompt. Can't pay for a downstream service. Can't prove who it is.
Agents are trying to operate in a world built for humans — and they have none of the infrastructure humans take for granted.
Mailgent is one API call that fixes that:
📬 Mail — a real [email protected] inbox with DKIM, threading, labels. Send, receive, search.
🔐 Vault — encrypted credential store scoped to the agent's key. No hardcoded secrets.
🔑 2FA / TOTP — time-based codes so agents can authenticate through 2FA gates.
💳 Wallet — USDC on Base. Agents pay x402-priced APIs per call, under spending limits you set. This is the part that makes fully autonomous agents actually possible without handing them your card.
🪪 Identity — a did:web keypair. Agents sign requests and prove who they are.
📅 Calendar — create events, manage availability, share iCal feeds.
One curl call, everything live in seconds:
curl -X POST https://api.mailgent.dev/v0/agen...
MCP-native — drop the returned key into your MCP server and your agent immediately gets mail_send, vault_store, identity_sign, payments, and more as ready-made tools. Works with Claude, Cursor, ChatGPT, OpenAI, LangChain, CrewAI, LlamaIndex, Hermes Agent, OpenClaw, NemoClaw, n8n, Vercel, and any MCP client.
We built this because we needed it ourselves. Our own agents kept hitting these same walls.
One question I'm genuinely curious about: what's the wall your agents keep hitting that you haven't been able to work around? Specific scenario — there are probably capability gaps we should close next.
About Mailgent on Product Hunt
“ AI agents that can email, pay APIs, sign, and store secrets”
Mailgent was submitted on Product Hunt and earned 52 upvotes and 18 comments, placing #12 on the daily leaderboard. Agents keep hitting the same walls: no inbox, no safe credential store, no way past a 2FA gate, no way to pay for a downstream API, no verifiable identity. Mailgent fixes this in one curl call. Every agent gets a real inbox (DKIM, threading), encrypted vault, TOTP/2FA, USDC wallet for x402-priced API payments, verifiable DID (Ed25519), and a calendar. MCP-native. Works with Claude, Cursor, OpenAI, LangChain, CrewAI, Hermes Agent, OpenClaw, NemoClaw, n8n, and more. Everything live in seconds.
On the analytics side, Mailgent competes within Email, Payments and Developer Tools — topics that collectively have 564.8k followers on Product Hunt. The dashboard above tracks how Mailgent performed against the three products that launched closest to it on the same day.
Who hunted Mailgent?
Mailgent was hunted by Danny Heng. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Mailgent including community comment highlights and product details, visit the product overview.
Danny Heng