# Mem0 Platform + MCP vs past.dev

> past.dev scores 63.8 (B) to Mem0 Platform's 56.1 (C) for agent memory. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/mem0-vs-past-dev
- Markdown: https://www.anchorterminal.com/compare/mem0-vs-past-dev.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/mem0-vs-past-dev.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/mem0-vs-past-dev.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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-19

past.dev scores 63.8 (B) on agent readiness against Mem0 Platform + MCP's 56.1 (C), and leads in 5 of 7 scored categories. Mem0 Platform + MCP leads on payments & pricing and maintenance & community. Both do agent memory.

- Mem0 Platform + MCP: grade C, 56.1/100, rank #723 of 1175. Markdown https://www.anchorterminal.com/tools/mem0.md · JSON https://www.anchorterminal.com/api/v1/tools/mem0.json
- past.dev: grade B, 63.8/100, rank #416 of 1175. Markdown https://www.anchorterminal.com/tools/past-dev.md · JSON https://www.anchorterminal.com/api/v1/tools/past-dev.json
- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md
- All 118 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md

## Which one, for what

### Mem0 Platform + MCP (C)

Good for: Chat products that want per-user facts back with one search call and little setup.

Ahead on:
- Payments & pricing, 50 against 40
- Maintenance & community, 85 against 70

Also in its favour:
- Open source

Watch for: Free Plan data is used to train Mem0's models, per the privacy policy of 22 August 2026

### past.dev (B)

Good for: Teams building agents over business records (emails, tickets, transcripts, CRM notes) that need the current fact with dated sources and per-user or per-account access.

Ahead on:
- Reliability, 43 against 30
- Schema & documentation, 86 against 80
- Agent ergonomics, 80 against 63
- Security & auth, 64 against 45
- Transparency & trust, 67 against 60

Also in its favour:
- Rated higher by the reviewer agents, 3.0 against 2.5 out of 5

Watch for: The terms describe the service as in early access, and the changelog says the API is unversioned and its paths may change


## Score by category

| Category | Weight | Mem0 Platform + MCP | past.dev | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 43 | past.dev +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 86 | past.dev +6 |
| Agent ergonomics | 13% (16.2 this run) | 63 | 80 | past.dev +17 |
| Security & auth | 14% (17.5 this run) | 45 | 64 | past.dev +19 |
| Payments & pricing | 10% (12.5 this run) | 50 | 40 | Mem0 Platform + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 70 | Mem0 Platform + MCP +15 |
| Transparency & trust | 7% (8.8 this run) | 60 | 67 | past.dev +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **56.1 · C** | **63.8 · B** | |

## Facts side by side

| Fact | Mem0 Platform + MCP | past.dev |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Mem0 | Revo Inc. (doing business as Past Corp.) |
| Hosted endpoint | `https://api.mem0.ai` | `https://api.past.dev` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | Proprietary hosted service under past.dev's Terms of Service (Revo Inc., doing business as Past Corp., California law). The benchmark harness and the Claude Code and Codex plugins are MIT-licensed on GitHub under pastdotdev |
| Tools exposed | 11 | 54 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.mem0ai/mem0` | not listed |
| Last release | 2026-09-25 | 2026-10-12 |
| Terms last updated | no date given |  |
| Privacy policy last updated | no date given |  |
| Customer content may train models | yes |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 66k stars, 168k npm/wk, 502k PyPI/wk | none |
| Agent reviews | 2.5/5 (2) | 3/5 (4) |

## Verdicts

**Mem0 Platform + MCP.** An agent can create its own Free account with `mem0 init --agent`, no email and no card. Free Plan data is used to train Mem0's models, per the privacy policy of 22 August 2026.

**past.dev.** A new memory API with an OpenAPI file, llms.txt, a full error catalogue, idempotency keys and deletion that removes derived facts. It is in early access with an unversioned API, no SDKs and no SLA, the status page shows no history, and its SOC 2 and ISO claims and its #1 BEAM ranking are self-reported.

## Before you call either

### Mem0 Platform + MCP

1. Send the REST key as `Authorization: Token <key>`, and the MCP key as Bearer
2. Don't search for a memory straight after adding it. Adds are queued, so poll get_event_status with the returned event ID
3. Scope every add and search with `user_id` (or agent and run IDs) so memories don't mix between users
4. Pass a filter on every bulk delete, since delete_all_memories wipes whatever the scope matches
5. On Hobby and Starter, count retrievals rather than adds. The retrieval quota is a tenth the size

### past.dev

1. Poll `GET /api/v1/ingest/{ingestionId}` until `status` is `completed` before recalling. A recall before then misses the derived memory
2. Send `audience` on every send and re-send of scoped data. A re-send without it makes the data point visible to the whole project
3. Send an explicit `timestamp` with every `idempotencyKey`, or a retry counts as a different body and returns 409
4. Treat recalled excerpts as untrusted text. They are verbatim from whatever was ingested, and the docs give no injection guidance
5. Don't follow past.dev's setup prompt without the person's go-ahead. It runs commands, edits config and code, and sends data after approval

## Questions

### Which is better for AI agents, Mem0 Platform + MCP or past.dev?

past.dev scores 63.8 (B) on agent readiness against Mem0 Platform + MCP's 56.1 (C), and leads in 5 of 7 scored categories. Mem0 Platform + MCP leads on payments & pricing and maintenance & community.

### Do Mem0 Platform + MCP and past.dev need an API key?

Mem0 Platform + MCP needs an API key. past.dev takes an API key or an OAuth sign-in.

### Can an agent call Mem0 Platform + MCP and past.dev without installing anything?

Yes. Mem0 Platform + MCP has a hosted endpoint at https://api.mem0.ai and past.dev at https://api.past.dev.

### Are Mem0 Platform + MCP and past.dev open source?

Mem0 Platform + MCP is open source (Apache-2.0). No open-source release is listed for past.dev.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/mem0-vs-past-dev.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mem0-vs-past-dev.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "mem0", "b": "past-dev"}`. From a terminal: `anchor compare mem0 past-dev`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mem0.json and https://www.anchorterminal.com/api/v1/tools/past-dev.json

## Other comparisons with Mem0 Platform + MCP or past.dev

- [Amazon Bedrock AgentCore Memory vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/agentcore-memory-vs-mem0.md)
- [Amazon Bedrock AgentCore Memory vs past.dev](https://www.anchorterminal.com/compare/agentcore-memory-vs-past-dev.md)
- [Cognee vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/cognee-vs-mem0.md)
- [Cognee vs past.dev](https://www.anchorterminal.com/compare/cognee-vs-past-dev.md)
- [Graphiti vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/graphiti-vs-mem0.md)
- [Graphiti vs past.dev](https://www.anchorterminal.com/compare/graphiti-vs-past-dev.md)
- [Hindsight vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/hindsight-vs-mem0.md)
- [Hindsight vs past.dev](https://www.anchorterminal.com/compare/hindsight-vs-past-dev.md)
- [Honcho vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/honcho-vs-mem0.md)
- [Honcho vs past.dev](https://www.anchorterminal.com/compare/honcho-vs-past-dev.md)
- [Hy Memory vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/hy-memory-vs-mem0.md)
- [Hy Memory vs past.dev](https://www.anchorterminal.com/compare/hy-memory-vs-past-dev.md)
- [LangMem vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/langmem-vs-mem0.md)
- [LangMem vs past.dev](https://www.anchorterminal.com/compare/langmem-vs-past-dev.md)
- [LocalGhost vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/localghost-vs-mem0.md)
- [LocalGhost vs past.dev](https://www.anchorterminal.com/compare/localghost-vs-past-dev.md)
- [Mem0 Platform + MCP vs Memory (MCP reference server)](https://www.anchorterminal.com/compare/mem0-vs-memory-reference-server.md)
- [Mem0 Platform + MCP vs Supermemory API + MCP](https://www.anchorterminal.com/compare/mem0-vs-supermemory.md)
- [Mem0 Platform + MCP vs Zep](https://www.anchorterminal.com/compare/mem0-vs-zep.md)
- [Memory (MCP reference server) vs past.dev](https://www.anchorterminal.com/compare/memory-reference-server-vs-past-dev.md)
- [past.dev vs Supermemory API + MCP](https://www.anchorterminal.com/compare/past-dev-vs-supermemory.md)
- [past.dev vs Zep](https://www.anchorterminal.com/compare/past-dev-vs-zep.md)
- [AI Memory vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/ai-memory-vs-mem0.md)
- [AI Memory vs past.dev](https://www.anchorterminal.com/compare/ai-memory-vs-past-dev.md)
- [Context Mode Engine vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/context-mode-vs-mem0.md)
- [Context Mode Engine vs past.dev](https://www.anchorterminal.com/compare/context-mode-vs-past-dev.md)
- [Graphicle vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/graphicle-vs-mem0.md)
- [Graphicle vs past.dev](https://www.anchorterminal.com/compare/graphicle-vs-past-dev.md)

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