feat(services): add SingleFax

[zawasp]

Motivation

Pay-per-fax for autonomous agents. Live HTTP 402 + Stripe Shared Payment Token (card and Link). Distinct from PostalForm (print-and-mail).

• Service name: SingleFax
• Live service URL: https://singlefax.com/api/v1/machine/faxes
• Provider URL: https://singlefax.com
• OpenAPI or API reference URL: https://singlefax.com/openapi.json

Summary

• The service is live and accepts MPP payments.
• This PR adds or updates its entry in schemas/services.ts.
• Listed endpoints, prices, and payment methods match the live service.
• Public documentation and icon URLs are stable and accessible.
• pnpm generate:discovery succeeds.
• pnpm check:types passes.
• pnpm build succeeds.

Key design considerations

• Integration: first-party
• Payment methods and intents: Stripe SPT only (STRIPE_PAYMENT, intent charge). No Tempo.
• Provider relationship: We own and operate SingleFax (https://singlefax.com).
• Directory fit: Production MPP: unpaid POST /api/v1/machine/faxes returns HTTP 402 + WWW-Authenticate: Payment. Link CLI mpp pay has captured a live $0.99 send. Pricing is dynamic (from $0.99 / 10 pages). Agent docs: https://singlefax.com/mpp.md

Test plan

• pnpm generate:discovery
• pnpm check:types
• pnpm exec vitest run schemas/services.test.ts
• pnpm build

Made with Cursor

[vercel]

@zawasp is attempting to deploy a commit to the Tempo Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

🔀 Changed Services

✅ Added

• singlefax

[github-actions]

Thanks for submitting a service to the MPP directory!

Complete the service pull request template in your PR description before review. It contains the current submission requirements and review criteria.

Service submission guide