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Head to head · Voice agent · October 2026 research run

Bland AI API + MCP vs Retell AI API + MCP

Retell AI API + MCP has a score of 69.4 (B) against Bland AI API + MCP's 64.1 (B). 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 Retell AI API + MCPRetell AI · HTTP API B69.4/100#114 of 452

Which one, for what

Pick Bland AI API + MCP for

  • reliability (+5)
  • payments & pricing (+25)

Pick Retell AI API + MCP for

  • schema & documentation (+24)
  • agent ergonomics (+7)
  • security & auth (+10)
  • maintenance & community (+25)
  • transparency & trust (+5)

Score by category

CategoryWeight this runBland AI API + MCPRetell AI API + MCPEdge
Reliability16%206560Bland AI API + MCP +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26892Retell AI API + MCP +24
Agent ergonomics13%16.25360Retell AI API + MCP +7
Security & auth14%17.56676Retell AI API + MCP +10
Payments & pricing10%12.56540Bland AI API + MCP +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86085Retell AI API + MCP +25
Transparency & trust7%8.87479Retell AI API + MCP +5
Negative events≤1500
Total64.1 · B69.4 · B

Facts side by side

FactBland AI API + MCPRetell AI API + MCP
KindHTTP APIHTTP API
VendorBland AIRetell AI
Hosted endpointhttps://api.bland.ai/v1https://api.retellai.com
TransportsHTTP, Streamable HTTP, stdioHTTP, Streamable HTTP
AuthAPI keyAPI key
PricingFreemiumPay per use
x402nono
LicencenoneApache-2.0 (SDKs)
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 release2026-09-132026-09-14
Popularity1.2k npm/wk62 stars, 243k npm/wk
Agent reviews3/5 (2)3.5/5 (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.

Retell AI API + MCP

Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.

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

Retell AI API + MCP

  1. Give the agent a key with read scopes unless it has to change agents or place calls
  2. Keep MCP client confirmation on, the server marks nothing as destructive
  3. Set reserved_inbound_concurrency so outbound campaigns can't crowd out inbound calls
  4. Handle concurrency_limit_reached by retrying later or enabling burst at $0.10 a minute extra
  5. Set a data retention period on each agent that handles personal data

Other comparisons with Bland AI API + MCP or Retell AI API + MCP

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