# 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. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/upstash-vector-vs-vespa
- Markdown: https://www.anchorterminal.com/compare/upstash-vector-vs-vespa.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/upstash-vector-vs-vespa.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/upstash-vector-vs-vespa.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

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 + MCP: grade B, 62.4/100, rank #391 of 842. Markdown https://www.anchorterminal.com/tools/upstash-vector.md · JSON https://www.anchorterminal.com/api/v1/tools/upstash-vector.json
- Vespa: grade BB, 70/100, rank #157 of 842. Markdown https://www.anchorterminal.com/tools/vespa.md · JSON https://www.anchorterminal.com/api/v1/tools/vespa.json

## 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

| Category | Weight | Upstash Vector API + MCP | Vespa | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 80 | Vespa +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 49 | 58 | Vespa +9 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 80 | Vespa +5 |
| Security & auth | 14% (17.5 this run) | 63 | 75 | Vespa +12 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 46 | 91 | Vespa +45 |
| Transparency & trust | 7% (8.8 this run) | 82 | 85 | Vespa +3 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **62.4 · B** | **70 · BB** | |

## Facts side by side

| Fact | Upstash Vector API + MCP | Vespa |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Upstash | Vespa.ai AS |
| Hosted endpoint | `https://api.upstash.com/v2` | no (local only) |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Pay per use |
| x402 | no | no |
| Licence | MIT | Apache-2.0 for the engine, the Vespa CLI and pyvespa. Vespa Cloud is a paid hosted service |
| Tools exposed | 55 | none |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.upstash/mcp-server` | not listed |
| Last release | 2026-08-24 | 2026-10-01 |
| Terms last updated |  | no document linked |
| Privacy policy last updated |  | no 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 |  |  |
| Popularity | 70 stars, 187k npm/wk, 34k PyPI/wk | 7.1k stars, 180k PyPI/wk |
| Agent reviews | 3/5 (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).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/upstash-vector-vs-vespa.json, and with the fewest tokens: https://www.anchorterminal.com/compare/upstash-vector-vs-vespa.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "upstash-vector", "b": "vespa"}`. From a terminal: `anchor compare upstash-vector vespa`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/upstash-vector.json and https://www.anchorterminal.com/api/v1/tools/vespa.json

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