# Redox vs Terra API

> Terra scores 65.9 (B) to Redox's 58.3 (C) for fhir servers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/redox-vs-terra
- Markdown: https://www.anchorterminal.com/compare/redox-vs-terra.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/redox-vs-terra.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/redox-vs-terra.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

Terra API scores 65.9 (B) on agent readiness against Redox's 58.3 (C), and leads in 4 of 7 scored categories. Redox leads on reliability and security & auth. Both do fhir servers.

- Redox: grade C, 58.3/100, rank #618 of 1076. Markdown https://www.anchorterminal.com/tools/redox.md · JSON https://www.anchorterminal.com/api/v1/tools/redox.json
- Terra API: grade B, 65.9/100, rank #327 of 1076. Markdown https://www.anchorterminal.com/tools/terra.md · JSON https://www.anchorterminal.com/api/v1/tools/terra.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

### Redox (C)

Good for: Health software vendors integrating with many hospital EHRs and networks, and integration teams who want an agent to manage Redox configuration.

Ahead on:
- Reliability, 85 against 67
- Security & auth, 78 against 65

Watch for: The MCP server loads 107 tools in one set, including write and delete tools with no confirmation step

### Terra API (B)

Good for: A fitness, wellness, insurance or research product whose users connect consumer wearables and apps, and an agent that needs to read one user's sleep, activity or body data through MCP.

Ahead on:
- Schema & documentation, 89 against 56
- Agent ergonomics, 78 against 54
- Payments & pricing, 20 against 15
- Maintenance & community, 75 against 31

Watch for: No free tier. Sign-up asks for a plan and billing details, and Quick Start starts at $499 a month with a 30-day money-back guarantee


## Score by category

| Category | Weight | Redox | Terra API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 67 | Redox +18 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 56 | 89 | Terra API +33 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 78 | Terra API +24 |
| Security & auth | 14% (17.5 this run) | 78 | 65 | Redox +13 |
| Payments & pricing | 10% (12.5 this run) | 15 | 20 | Terra API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 31 | 75 | Terra API +44 |
| Transparency & trust | 7% (8.8 this run) | 59 | 56 | Redox +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **58.3 · C** | **65.9 · B** | |

## Facts side by side

| Fact | Redox | Terra API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Redox, Inc. | Terra Enabling Developers Inc. |
| Hosted endpoint | `https://api.redoxengine.com/mcp` | `https://access.tryterra.co/api/v2/mcp/<user_id>` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under Redox's Cloud Services Agreement, EULA and SLA (version 2016.1) | Proprietary service under Terra's terms of service. The OpenAPI specs repository is Apache 2.0 |
| Tools exposed | 107 | 6 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | none | 2026-10-13 |
| Terms last updated | 2015-10-17 | 2026-05-01 |
| Privacy policy last updated | 2023-01-18 | 2023-04-20 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 13k npm/wk, 11k PyPI/wk |

## Verdicts

**Redox.** Redox connects to EHRs and clinical networks behind a FHIR API, with signed-JWT OAuth keys, a 99.95 per cent SLA, a HackerOne bug bounty and a hosted MCP server for managing integrations. The MCP server exposes 107 tools at once with write and delete tools unconfirmed, OpenAPI files sit behind login, and the sandbox plan costs $15,000 a year.

**Terra API.** Graded on the Unified API and the Terra AI MCP server. A public OpenAPI 3.1 spec, llms.txt, per-user rate limits with Retry-After, and scoped admin tokens with approvals. Access starts at $499 a month with billing details at sign-up, the data API key has no scopes, and API key requests failed for 2 hours 38 minutes on 7 August 2026.

## Before you call either

### Redox

1. Name the environment in every MCP prompt and try configuration changes in staging first, as Redox advises
2. Stay under 7,500 requests per IP per five minutes, and back off exponentially on 5XX
3. Sign the token request with the private key whose public key is registered on the OAuth API key
4. Ask an organisation owner to enable the MCP server before connecting a client
5. Treat log payloads returned through MCP as PHI and as untrusted text

### Terra API

1. Send dev-id and x-api-key headers on every Unified API and Terra AI call. A missing header returns 401 problem+json
2. Keep each request window to 1,825 days or less and under 6,000 requested days per user an hour. On 429 with rule r2, wait Retry-After seconds
3. Pass either fields or select to Terra AI tools, never both and never neither, or the call fails with a validation error
4. Expect data by webhook after a user connects through the widget session. REST reads are for backfills and on-demand queries
5. Use the Read only access level for the admin MCP server unless a change is needed. The MCP level can read API keys

## Questions

### Which is better for AI agents, Redox or Terra API?

Terra API scores 65.9 (B) on agent readiness against Redox's 58.3 (C), and leads in 4 of 7 scored categories. Redox leads on reliability and security & auth.

### Do Redox and Terra API need an API key?

Redox uses an OAuth sign-in. Terra API takes an API key or an OAuth sign-in.

### Can an agent call Redox and Terra API without installing anything?

Yes. Redox has a hosted endpoint at https://api.redoxengine.com/mcp and Terra API at https://access.tryterra.co/api/v2/mcp/<user_id>.


## For agents

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

## Other comparisons with Redox or Terra API

- [1upHealth vs Terra API](https://www.anchorterminal.com/compare/1uphealth-vs-terra.md)
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