Oh Fax vs Phaxio (Sinch): price, account, and agent support
An honest comparison of Oh Fax and Phaxio (Sinch) for sending a fax in the US or Canada, with prices checked Oct 24, 2026 on Phaxio (Sinch)'s own site.
Oh Fax: $1.00 per fax by card for up to 25 pages ($0.02 per page after that, 30-page cap), or $0.02 per page from a prepaid balance or USDC. No subscription, no fax number, and no account needed for card or USDC payments.
Phaxio (Sinch) pricing
Phaxio's FAQ lists 7 cents a page, no monthly fees, and account funding in increments of $10 or more (Phaxio FAQ, checked Oct 24, 2026). Sinch, which now runs Phaxio, lists a flat $0.045 per page for its Fax API (Sinch Fax API, checked Oct 24, 2026).
Price per fax (US/Canada, outbound)
| Pages | Phaxio (Sinch) | Oh Fax |
|---|---|---|
| 1 page | $0.07 (Phaxio) / $0.045 (Sinch) | $1.00 card / $0.02 balance or USDC |
| 3 pages | $0.21 / $0.135 | $1.00 card / $0.06 balance or USDC |
| 10 pages | $0.70 / $0.45 | $1.00 card / $0.20 balance or USDC |
Oh Fax prices come from our pricing page.
At a glance
| Phaxio (Sinch) | Oh Fax | |
|---|---|---|
| Account required | Yes, a developer account. Phaxio requires at least $10 per account top-up. | No for card or USDC payments. An API key with a prepaid balance is optional. |
| API | Yes, a REST API. | REST API at app.ohfax.com/api/v1 |
| AI agent / MCP | None published. | Remote MCP at https://app.ohfax.com/mcp. Paid MPP requests need no account. |
| Coverage | See Phaxio (Sinch) | US and Canada only, up to 30 pages per fax. Outbound only. |
When Phaxio (Sinch) is better
- You're building high-volume fax into your own product and want a carrier-style API with numbers to receive on.
- You need international faxing.
- Note: on our prepaid balance, Oh Fax costs $0.02 per page, which is less per page than either published rate. Card payments cost $1.00 per fax.
When Oh Fax is better
- You want an AI agent (Claude, ChatGPT, Cursor, Codex) to send the fax without signing up or keeping a subscription.
- You send faxes occasionally and want to pay per fax.
- You want an exact quote before you pay, and an automatic refund if the fax can't be delivered.
Switch in a minute
Add https://app.ohfax.com/mcp to your agent as an MCP server, or open ohfax.com and upload a PDF. See the MCP setup guide.
Sources
- Phaxio FAQ (checked Oct 24, 2026)
- Sinch Fax API (checked Oct 24, 2026)
The competitor prices above are taken from each competitor's own published pages. Check them before you rely on them, because they can change.