Synthflow
Synthflow scores 85/100 on xpay's Agent-Ready Index v2: partial pricing visibility; self-serve checkout is available; a public API exists with documentation; usage-based / per-token pricing is published; a free entry path exists.
Synthflow pricing
Sign up, get an API key, pay per call
Self-serve checkout with public pricing — an autonomous agent can complete the purchase without a sales call.
12 SKUs priced in mixed units (minute, month, concurrency)
| Model / SKU | Input | Output |
|---|---|---|
Voice Engine | $0.09 / minute | — |
Synthflow-managed Twilio | $0.02 / minute | — |
Bring Your Own Twilio | $0 / minute | — |
Performance Routing | $0.04 / minute | — |
Global Low Latency Edge | $0.04 / minute | — |
White‑Label & Reseller Toolkit Add‑on for enterprise branding | $2000 / month | — |
Extra Concurrency Per additional concurrency unit per month | $20 / concurrency | — |
GPT‑4.1 mini LLM | $0.02 / minute | — |
GPT‑4.1 LLM | $0.05 / minute | — |
GPT‑5 LLM | $0.04 / minute | — |
GPT‑5.1 LLM | $0.04 / minute | — |
GPT‑5.2 LLM | $0.04 / minute | — |
How Synthflow scores on the agent-ready dimensions
Public pricing visibility
15 / 15
Self-serve checkout
15 / 15
Public API + docs
16 / 20
Usage-based / metered pricing
20 / 20
Free entry path
7 / 7
No sales call required
7 / 7
Card / wallet / x402 payment
5 / 6
Machine-readable bonus (MCP / OpenAPI)
0 / 10
Total
85 / 100
What it actually costs at typical scale
10k minutes, Voice Engine only
$900/mo
10k minutes, Voice Engine + Synthflow‑managed Twilio
$1100/mo
Can an autonomous agent transact here?
Can create account
Can enter payment method
Can upgrade plan
Can buy more usage
Can cancel online
Payment methods
Human approval recommended
Pricing transparency
full
Purchase motion
self_serve
Demo required
Quote required
Annual commit required
Auto-renewal mentioned
Cancellation policy visible
Refund policy visible
Invoice payment available
Unknown
Purchase orders supported
Unknown
MSA required
DPA available
Security review required
Unknown
Trial
Available
API & developer surface
API-first product
Sandbox present
Unknown
Webhooks
Unknown
MCP mentioned
Trust & compliance
Certifications
SSO / SAML
Unknown
RBAC
Unknown
Audit logs
Unknown
Positioning & ecosystem
“Your Ultimate Path to Voice AI”
Buyer persona
Six-step check: can an agent actually buy from Synthflow?
Discover price
Select a plan
Pay per task
Avoid a sales call
API docs without auth
Estimate cost upfront
Pros and cons for AI agents
Observational summary written by xpay from the signals captured on 2026-05-06. Not a review of the product — only of its current pricing posture for agent buyers.- Pricing is publicly visible on an indexable page — agents can read tiers without scraping past auth.
- Every advertised tier is self-serve; no tier requires scheduling a call.
- No per-unit price was advertised, so an agent has no way to estimate the cost of a single task.
- API documentation is gated or absent; an agent cannot inspect the integration surface without authentication.
- PPU requires account creation and an issued API key; a fully unauthenticated agent purchase is not yet supported.
- No /.well-known/ai-pricing.json or equivalent machine-readable pricing manifest is published — agents must rely on HTML scraping.
How Synthflow could lift its score
Add a per-unit price (e.g. $X / 1K calls) to the pricing page so an agent can compute its own cost before committing.
| pricing_visible | true |
| headline_phrasing | Your Ultimate Path to Voice AI — Most pay-as-you-go (PAYG) setups fall between $0.15 and $0.24 per minute, depending on your LLM and telephony selections. |
| tier_count | 3 |
| lowest_paid_entry_usd | null |
| free_tier | false |
| free_tier_terms | null |
| per_unit_price | $0.24 per minute |
| annual_required | false |
| self_serve_paid_tiers | 2 |
| sales_only_tiers | 0 |
| public_api_docs_url | null |
| api_docs_auth_walled | null |
| ai_pricing_json_present | false |
| agents_txt_present | false |
| anonymous_purchase_path | false |
| per_unit_classification | {"unit_class":"compute_time","confidence":"medium","agent_task_price_forecastable":"partial","rejected_reason":null,"evidence_text":"$0.24 per minute"} |
| usage_headline_present | true |
| custom_tier_present | true |
| agent_friendly | {"ai_pricing_json":false,"agents_txt":false,"llms_txt":true,"sitemap_xml":true,"mcp_server_card":false,"agent_skills_index":false,"x402_supported":false} |
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See agent-ready picksSynthflow
85
/ 100 (rubric v2.0)Conversational Marketing
Not advertised
3
No
Sales-led
$0.24 per minute
2 / 0
Auth-walled
No
Not published
2026-05-09
Pay-as-you-go API
Synthflow pricing starts at $0/mo for the free plan; paid usage is billed per minute at $0.02–$0.09 depending on telephony and LLM choices, with add‑ons such as $2,000/mo white‑label and $20/mo per extra concurrency unit. Billed usage‑based.
Free plan (Free)
Discovery files and protocols
Side-channel signals — informational, not part of the score. Each protocol is independent; adoption signals the publisher is thinking about agent buyers.ai-pricing.json
agents.txt
llms.txt
sitemap.xml
MCP Server Card
Agent Skills
x402 / MPP
Compare Synthflow with peers
Highest-scoring companies in the same category that an AI agent might evaluate as an alternative.SigmaMind AI
85
360dialog
78
Respond.io
73
Tolstoy
69
Gallabox
64
Nabiq
62
Hachly AI
62
ChatFunnels
55
Explore the Agent-Ready SaaS Index
25,480+ SaaS scored on agent-buyability — browse by readiness band, category, or jump straight to a pay-per-run tool on xpay.tools.