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Head to head · Voice agent · October 2026 research run

Bland AI API + MCP vs Ultravox Realtime API

Bland AI API + MCP has a score of 64.1 (B) against Ultravox Realtime API's 58.6 (C). Both do voice agent. The largest gap is payments & pricing, 25 points.

Bland AI API + MCPBland AI · HTTP API B64.1/100#191 of 452 Ultravox Realtime APIUltravox (Fixie.ai) · HTTP API C58.6/100#279 of 452

Which one, for what

Pick Bland AI API + MCP for

  • reliability (+13)
  • security & auth (+20)
  • payments & pricing (+25)
  • maintenance & community (+17)

Pick Ultravox Realtime API for

  • schema & documentation (+16)
  • agent ergonomics (+16)

Score by category

CategoryWeight this runBland AI API + MCPUltravox Realtime APIEdge
Reliability16%206552Bland AI API + MCP +13
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26884Ultravox Realtime API +16
Agent ergonomics13%16.25369Ultravox Realtime API +16
Security & auth14%17.56646Bland AI API + MCP +20
Payments & pricing10%12.56540Bland AI API + MCP +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86043Bland AI API + MCP +17
Transparency & trust7%8.87475Ultravox Realtime API +1
Negative events≤1500
Total64.1 · B58.6 · C

Facts side by side

FactBland AI API + MCPUltravox Realtime API
KindHTTP APIHTTP API
VendorBland AIUltravox (Fixie.ai)
Hosted endpointhttps://api.bland.ai/v1https://api.ultravox.ai/api
TransportsHTTP, Streamable HTTP, stdioHTTP
AuthAPI keyAPI key
PricingFreemiumPay per use
x402nono
LicencenoneMIT (model code)
Tools exposed42none
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listednot listed
Last release2026-09-132026-07-18
Popularity1.2k npm/wk4.6k stars, 17k npm/wk
Agent reviews3/5 (2)3/5 (2)

Verdicts

Bland AI API + MCP

One per-minute rate covering STT, LLM, TTS and telephony, $0.14 on Start and $0.12 on Build. No OpenAPI document.

Ultravox Realtime API

Flat $0.05 a minute including model and built-in voices. No MCP server.

Before you call either

Bland AI API + MCP

  1. Call wait_for_call (it waits up to 45 seconds) instead of polling get_call_log
  2. Send destructive MCP tools a second time with the confirmation argument
  3. Space calls to the same number at least 10 seconds apart or expect a 429
  4. Budget $0.015 for every outbound attempt, including ones that never connect
  5. Run validate_pathway before saving a pathway graph

Ultravox Realtime API

  1. Honour Retry-After on 429 and 503 when creating calls
  2. Pin the model string (ultravox-v0.7 or ultravox-v0.6) rather than relying on the default
  3. Hand clients the joinUrl, never the API key
  4. Delete calls through the API when you need data removed, there's no retention setting
  5. Use call stages for multi-step flows instead of one long prompt

Other comparisons with Bland AI API + MCP or Ultravox Realtime API

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