# Medblocks vs Zus Health

> Zus Health scores 56.6 (C) to Medblocks's 52.7 (D) for patient record retrieval. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/medblocks-vs-zus-health
- Markdown: https://www.anchorterminal.com/compare/medblocks-vs-zus-health.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/medblocks-vs-zus-health.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/medblocks-vs-zus-health.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: 2026-10-14

Zus Health scores 56.6 (C) on agent readiness against Medblocks's 52.7 (D), and leads in 3 of 7 scored categories. Medblocks leads on agent ergonomics, security & auth, payments & pricing and maintenance & community. Both do patient record retrieval.

- Medblocks: grade D, 52.7/100, rank #773 of 1076. Markdown https://www.anchorterminal.com/tools/medblocks.md · JSON https://www.anchorterminal.com/api/v1/tools/medblocks.json
- Zus Health: grade C, 56.6/100, rank #669 of 1076. Markdown https://www.anchorterminal.com/tools/zus-health.md · JSON https://www.anchorterminal.com/api/v1/tools/zus-health.json
- Best health record and wellness data APIs for AI agents: https://www.anchorterminal.com/best/health-data/index.md
- All 63 health comparisons: https://www.anchorterminal.com/compare/health-data/index.md

## Which one, for what

### Medblocks (D)

Good for: A consumer or care app, or an assistant, that needs a patient's own records from US hospitals and payers with the patient's consent, and wants an MCP route as well as REST.

Ahead on:
- Agent ergonomics, 72 against 67
- Security & auth, 67 against 49
- Payments & pricing, 25 against 5
- Maintenance & community, 69 against 64

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: No status page, SLA or published rate limits for the Platform API

### Zus Health (C)

Good for: US care organisations and digital health builders that want a shared, continuously refreshed patient profile in FHIR with EHR embedding.

Ahead on:
- Reliability, 66 against 28
- Schema & documentation, 77 against 62
- Transparency & trust, 59 against 51

Watch for: No public prices, and the sandbox is requested through a Google Form


## Score by category

| Category | Weight | Medblocks | Zus Health | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 28 | 66 | Zus Health +38 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 62 | 77 | Zus Health +15 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 67 | Medblocks +5 |
| Security & auth | 14% (17.5 this run) | 67 | 49 | Medblocks +18 |
| Payments & pricing | 10% (12.5 this run) | 25 | 5 | Medblocks +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 69 | 64 | Medblocks +5 |
| Transparency & trust | 7% (8.8 this run) | 51 | 59 | Zus Health +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **52.7 · D** | **56.6 · C** | |

## Facts side by side

| Fact | Medblocks | Zus Health |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Medblocks Inc. | Zus Health, Inc. |
| Hosted endpoint | `https://app.medblocks.com/mcp` | no (local only) |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under Medblocks' terms. The medblocks TypeScript SDK on npm carries a proprietary licence that forbids redistribution and reverse engineering. The agent skills repository has no licence file | Proprietary service under the Zus Builder Terms of Service (last updated 11 March 2025), the Developer Sandbox Terms and the Zus Business Associate Addendum |
| Tools exposed | 10 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-14 | 2026-10-14 |
| Terms last updated | 2026-10-05 | 2025-03-11 |
| Privacy policy last updated | 2026-10-05 | 2026-06-24 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 36 npm/wk | none |

## Verdicts

**Medblocks.** Patient-authorised record retrieval with a ten-tool remote MCP server, OAuth with per-capability consent, an audit entry for every call and a free plan for 1,000 active patients. No status page, no published rate limits and no idempotency keys were found, and the OpenAPI file behind the reference is not published.

**Zus Health.** FHIR R4 over an aggregated patient profile drawn from CommonWell, Carequality, Surescripts, Quest and ADT networks, with published rate limits, a 99.5 per cent SLA and a dated changelog. Accounts and sandboxes are provisioned by Zus on request, with no public prices, no named security certification and no SDK.

## Before you call either

### Medblocks

1. Connect with `claude mcp add --transport http medblocks https://app.medblocks.com/mcp` and sign in, or send a workspace API key as a Bearer token from a backend
2. Ask the person before calling `disconnect_health_system` or `delete_person`. Both are permanent
3. Wait for the connection webhook or check connection status before reading records. Pulls run in the background after the patient approves
4. Branch on `error.code`, not the message, and wait the `Retry-After` seconds on a 429
5. Use a Sandbox workspace and the Synthetic Hospital (password `demopass`) for tests. Sandbox keys cannot reach production sources

### Zus Health

1. Cache the access token for its hour. More than 200 token requests an hour per App Client returns 429
2. Request Patient History at most once per patient per 24 hours, and poll the job status endpoint
3. Use conditional create by identifier so a retried write doesn't duplicate a resource
4. Send `Zus-If-Match` with the resource's ETag on PUT and PATCH
5. Set `_count` up to 500 on searches, since the default page is 10

## Questions

### Which is better for AI agents, Medblocks or Zus Health?

Zus Health scores 56.6 (C) on agent readiness against Medblocks's 52.7 (D), and leads in 3 of 7 scored categories. Medblocks leads on agent ergonomics, security & auth, payments & pricing and maintenance & community.

### Do Medblocks and Zus Health need an API key?

Medblocks takes an API key or an OAuth sign-in. Zus Health uses an OAuth sign-in.

### Can an agent call Medblocks and Zus Health without installing anything?

Medblocks has a hosted endpoint at https://app.medblocks.com/mcp. No hosted endpoint is listed for Zus Health.


## For agents

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

## Other comparisons with Medblocks or Zus Health

- [Aidbox vs Medblocks](https://www.anchorterminal.com/compare/aidbox-vs-medblocks.md)
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- [Medblocks vs ROOK](https://www.anchorterminal.com/compare/medblocks-vs-rook.md)
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