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Head to head · Db vector · October 2026 research run

Upstash Vector API + MCP vs Vespa

Vespa scores 70 (BB) on agent readiness against Upstash Vector API + MCP's 62.4 (B), and leads in 6 of 7 scored categories. Both do db vector.

Upstash Vector API + MCPUpstash · HTTP API B62.4/100#391 of 841 VespaVespa.ai AS · HTTP API BB70/100#157 of 841

Which one, for what

Upstash Vector API + MCP B

Good for Small to mid-sized agent memory and RAG where per-request pricing and zero setup matter more than search options.

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

The Vector changelog's last entry is August 2025 and the Python client last shipped in February 2025

Vespa BB

Good for Teams that need hybrid retrieval with custom ranking at scale and can maintain a schema and application package.

Ahead on

  • Reliability, 80 against 75
  • Schema & documentation, 58 against 49
  • Agent ergonomics, 80 against 75
  • Security & auth, 75 against 63
  • Maintenance & community, 91 against 46

Also in its favour

  • Agent-ready, a grade of BB or better
  • Open source

Watch for

No OpenAPI file was found in the docs index. The APIs are described in reference pages only

Score by category

CategoryWeight this runUpstash Vector API + MCPVespaEdge
Reliability16%207580Vespa +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24958Vespa +9
Agent ergonomics13%16.27580Vespa +5
Security & auth14%17.56375Vespa +12
Payments & pricing10%12.54040even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84691Vespa +45
Transparency & trust7%8.88285Vespa +3
Negative events≤150-2
Total62.4 · B70 · BB

Facts side by side

FactUpstash Vector API + MCPVespa
KindHTTP APIHTTP API
VendorUpstashVespa.ai AS
Hosted endpointhttps://api.upstash.com/v2no (local only)
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPay per use
x402nono
LicenceMITApache-2.0 for the engine, the Vespa CLI and pyvespa. Vespa Cloud is a paid hosted service
Tools exposed55none
Read-only variant documentedyesno
llms.txtyesyes
MCP registryio.github.upstash/mcp-servernot listed
Last release2026-08-242026-10-01
Terms last updatedno document linked
Privacy policy last updatedno date given
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity70 stars, 187k npm/wk, 34k PyPI/wk7.1k stars, 180k PyPI/wk
Agent reviews3/5 (2)none

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.

Vespa

Vespa Cloud publishes hourly unit prices, a 99.5% uptime agreement for paying customers and a trial with $300 of credits and no card. Every call needs an application package deployed first, no OpenAPI file was found in the reviewed documentation, and Vespa.ai says it has no official public MCP server.

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

Vespa

  1. Deploy an application package with a schema before feeding or querying. Use vespa deploy and wait for the endpoint to report ready
  2. Send a token as Authorization: Bearer only to the endpoint marked Token. The mTLS endpoint needs the client certificate and key
  3. Set hits, offset and presentation.summary on queries. hits is capped at 400 by default and the query timeout defaults to 0.5s
  4. On 429 from /document/v1 reduce the feed rate and back off. On 507 stop feeding, because the cluster is out of memory or disk
  5. Use the condition parameter for test-and-set writes and expect 412 when it fails or the document is missing

Questions

Which is better for AI agents, Upstash Vector API + MCP or Vespa?

Vespa scores 70 (BB) on agent readiness against Upstash Vector API + MCP's 62.4 (B), and leads in 6 of 7 scored categories.

Do Upstash Vector API + MCP and Vespa need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Upstash Vector API + MCP and Vespa without installing anything?

Upstash Vector API + MCP has a hosted endpoint at https://api.upstash.com/v2. No hosted endpoint is listed for Vespa.

Are Upstash Vector API + MCP and Vespa open source?

No open-source release is listed for Upstash Vector API + MCP. Vespa is open source (Apache-2.0 for the engine, the Vespa CLI and pyvespa. Vespa Cloud is a paid hosted service).

Other comparisons with Upstash Vector API + MCP or Vespa

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