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

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- 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: 2026-10-05

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 + MCP: grade B, 62.4/100, rank #218 of 452. Markdown https://www.anchorterminal.com/tools/upstash-vector.md · JSON https://www.anchorterminal.com/api/v1/tools/upstash-vector.json
- Weaviate API + MCP: grade B, 68.2/100, rank #131 of 452. Markdown https://www.anchorterminal.com/tools/weaviate.md · JSON https://www.anchorterminal.com/api/v1/tools/weaviate.json

## 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

| Category | Weight | Upstash Vector API + MCP | Weaviate API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 35 | Upstash Vector API + MCP +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 49 | 82 | Weaviate API + MCP +33 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 92 | Weaviate API + MCP +17 |
| Security & auth | 14% (17.5 this run) | 63 | 79 | Weaviate API + MCP +16 |
| 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 | 90 | Weaviate API + MCP +44 |
| Transparency & trust | 7% (8.8 this run) | 82 | 71 | Upstash Vector API + MCP +11 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.4 · B** | **68.2 · B** | |

## Facts side by side

| Fact | Upstash Vector API + MCP | Weaviate API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Upstash | Weaviate |
| Hosted endpoint | `https://api.upstash.com/v2` | no (local only) |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | MIT | BSD-3-Clause (some parts under the Weaviate License) |
| Tools exposed | 55 | 4 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | yes | yes |
| llms.txt | yes | yes |
| MCP registry | `io.github.upstash/mcp-server` | not listed |
| Last release | 2026-08-24 | 2026-10-01 |
| Popularity | 70 stars, 187k npm/wk, 34k PyPI/wk | 17k stars, 406k npm/wk, 2.3M PyPI/wk |
| Agent reviews | 3/5 (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

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