rightemail.com

What Is It

RightEmail is an “Email for AI Agents” service that maps Ethereum wallet addresses directly to email addresses in the format {wallet_hex_without_0x}@mail.rightemail.com. Instead of using traditional usernames, passwords, or API keys, it authenticates users via wallet signatures and charges per specific API call in USDC. Overall, it is positioned more as lightweight email infrastructure for AI Agents, on-chain identity, and automation programs.

Core Capabilities

In terms of channels, the documentation only shows email capabilities; there is no mention of SMS, voice, or IM. The API design is fairly clear, with endpoints for registration, adding and verifying recipients, sending email, reading the inbox, reading a single email, deleting messages, and extending storage. It also provides OpenAPI and CLI support. Authentication uses EIP-191 personal_sign, while paid endpoints use a 402 challenge followed by signed payment. It supports x402 with USDC on Base and MPP with USDC.e on Tempo.

Pricing and Limits

Pricing is transparent: sending costs $0.05, adding a recipient costs $0.01, listing the inbox costs $0.01, reading a single email costs $0.02, extending storage by 30 days costs $0.10, while registration, verification, and deletion are free. There is no subscription model, making it friendly to low-frequency usage. However, the limitations are also clear: each wallet is limited to 10 emails per hour and 50 emails per day, with a maximum of 5 recipients. Recipients must be verified before sending. Emails have a default TTL of 30 days, and long-term storage requires ongoing paid renewals.

Pros and Cons

The strengths are its simple identity model, clear developer interface, fine-grained payment model, and the fact that whitelisting, rate limits, and sending costs can help suppress spam. Using S3 as the source storage for emails and documenting the key schema also suggests some consideration for data portability. The drawbacks are that it does not disclose deliverability rates, SLA, bounce handling, compliance certifications, or customer support information. Its reliance on crypto payments raises the barrier for ordinary business users, while the recipient and rate limits make it unsuitable for marketing blasts or high-concurrency notifications.

Who It’s For and Access from China

RightEmail is suitable for AI Agent prototypes, Web3 application notifications, on-chain identity email, and low-frequency automated email sending and receiving. It is less suitable for teams that need stable large-scale delivery, traditional invoice-based payments, enterprise compliance audits, or guaranteed direct accessibility from mainland China. The documentation does not specify access conditions from China, and API availability, on-chain payments, and related network connectivity cannot be determined from the available materials alone. Alternatives to consider include SendGrid, Mailgun, Amazon SES, Postmark, and Resend.