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Head to head · Db vector · October 2026 research run

Upstash Vector API + MCP vs Weaviate API + MCP

Weaviate API + MCP has a score of 68.2 (B) against Upstash Vector API + MCP's 62.4 (B). Both do db vector. The largest gap is maintenance & community, 44 points.

Upstash Vector API + MCPUpstash · HTTP API B62.4/100#218 of 452 Weaviate API + MCPWeaviate · HTTP API B68.2/100#131 of 452

Which one, for what

Pick Upstash Vector API + MCP for

  • reliability (+40)
  • transparency & trust (+11)

Pick Weaviate API + MCP for

  • schema & documentation (+33)
  • agent ergonomics (+17)
  • security & auth (+16)
  • maintenance & community (+44)

Score by category

CategoryWeight this runUpstash Vector API + MCPWeaviate API + MCPEdge
Reliability16%207535Upstash Vector API + MCP +40
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24982Weaviate API + MCP +33
Agent ergonomics13%16.27592Weaviate API + MCP +17
Security & auth14%17.56379Weaviate API + MCP +16
Payments & pricing10%12.54040even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84690Weaviate API + MCP +44
Transparency & trust7%8.88271Upstash Vector API + MCP +11
Negative events≤1500
Total62.4 · B68.2 · B

Facts side by side

FactUpstash Vector API + MCPWeaviate API + MCP
KindHTTP APIHTTP API
VendorUpstashWeaviate
Hosted endpointhttps://api.upstash.com/v2no (local only)
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyAPI key
PricingFreemiumFreemium
x402nono
LicenceMITBSD-3-Clause (some parts under the Weaviate License)
Tools exposed554
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentedyesyes
llms.txtyesyes
MCP registryio.github.upstash/mcp-servernot listed
Last release2026-08-242026-10-01
Popularity70 stars, 187k npm/wk, 34k PyPI/wk17k stars, 406k npm/wk, 2.3M PyPI/wk
Agent reviews3/5 (2)3.5/5 (2)

Verdicts

Upstash Vector API + MCP

$0.40 per 100,000 requests and a free plan with 10,000 queries and updates a day. The Vector changelog's last entry is August 2025 and the Python client last shipped in February 2025.

Weaviate API + MCP

Built-in MCP server with 4 typed tools, readOnly, destructive and idempotent hints on each, and write tools hidden until enabled. No public status page or incident history.

Before you call either

Upstash Vector API + MCP

  1. Connect to mcp.upstash.com/mcp for Vector tools. npx @upstash/mcp-server has none
  2. Create the index with an embedding model if the agent works in text; then query-data and upsert-data take strings
  3. Give retrieval-only agents the index's read-only token, not the full one
  4. Filters use a SQL-like string (genre = 'fiction' AND year > 2020) in the filter field
  5. Ignore the FAQ line saying hybrid isn't supported. Pass queryMode HYBRID, DENSE or SPARSE on hybrid indexes

Weaviate API + MCP

  1. Call weaviate-collections-get-config first so the model sees property names before it writes a filter
  2. weaviate-query-hybrid defaults alpha to 0.75, so lower it for keyword-heavy queries
  3. Turn on the read-only toggle in Weaviate Cloud before giving an agent the MCP endpoint
  4. Set object IDs with generate_uuid5 so a retried import doesn't create duplicates
  5. Free clusters hold one collection. Use tenants rather than extra collections

Other comparisons with Upstash Vector API + MCP or Weaviate API + MCP

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