# Terra API vs Validic Inform

> Terra scores 65.9 (B) to Validic Inform's 57.9 (C) for wearable and health app data. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/terra-vs-validic
- Markdown: https://www.anchorterminal.com/compare/terra-vs-validic.md (~2,350 tokens)
- Slim: https://www.anchorterminal.com/compare/terra-vs-validic.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/terra-vs-validic.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 Validic Inform's 57.9 (C), and leads in 4 of 7 scored categories. Validic Inform leads on reliability, payments & pricing and transparency & trust. Both do wearable and health app data.

- 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
- Validic Inform: grade C, 57.9/100, rank #628 of 1076. Markdown https://www.anchorterminal.com/tools/validic.md · JSON https://www.anchorterminal.com/api/v1/tools/validic.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

### 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 75
- Agent ergonomics, 78 against 50
- Security & auth, 65 against 30

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

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

### Validic Inform (C)

Good for: A remote patient monitoring or wellness app that needs normalised readings from many wearables and home devices, and an agent that wants to start building without a sales call.

Ahead on:
- Reliability, 73 against 67
- Payments & pricing, 40 against 20
- Transparency & trust, 71 against 56

Watch for: The organisation token is sent as `?token=` in the URL, the only documented option


## Score by category

| Category | Weight | Terra API | Validic Inform | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 67 | 73 | Validic Inform +6 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 75 | Terra API +14 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 50 | Terra API +28 |
| Security & auth | 14% (17.5 this run) | 65 | 30 | Terra API +35 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Validic Inform +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 74 | Terra API +1 |
| Transparency & trust | 7% (8.8 this run) | 56 | 71 | Validic Inform +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **65.9 · B** | **57.9 · C** | |

## Facts side by side

| Fact | Terra API | Validic Inform |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Terra Enabling Developers Inc. | Validic, Inc. (ChartSpan) |
| Hosted endpoint | `https://access.tryterra.co/api/v2/mcp/<user_id>` | no (local only) |
| Transports | HTTP, Streamable HTTP | HTTP, SSE (legacy) |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Terra's terms of service. The OpenAPI specs repository is Apache 2.0 | Proprietary service under Validic's Online Service Agreement for Inform (last updated 13 August 2025). The inform-quickstart sample apps are MIT |
| Tools exposed | 6 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-13 | 2026-10-12 |
| Terms last updated | 2026-05-01 | 2025-08-13 |
| Privacy policy last updated | 2023-04-20 | 2026-01-20 |
| 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 | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 13k npm/wk, 11k PyPI/wk | none |

## Verdicts

**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.

**Validic Inform.** Graded on the Inform REST and Streaming APIs. An agent can create a free developer account through a sign-up API, with only an emailed code needing a person's inbox, and llms.txt plus agent guides document every step. The organisation token travels in the URL query string, the free tier holds synthetic data only, and production access needs an Enterprise contract.

## Before you call either

### 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

### Validic Inform

1. Show the developer the free-tier terms and wait for acceptance before calling `POST /auth/register`
2. Send `Authorization: <id_token>` to sign-up calls, but pass the organisation token as `?token=` on Inform calls
3. Use the customer `uid` in URLs, never Validic's internal `id`, which returns a silent 404
4. Keep date ranges to 30 days or less and page month by month for backfills
5. Unwrap `data` on list responses and treat an empty array as normal on a new account

## Questions

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

Terra API scores 65.9 (B) on agent readiness against Validic Inform's 57.9 (C), and leads in 4 of 7 scored categories. Validic Inform leads on reliability, payments & pricing and transparency & trust.

### Do Terra API and Validic Inform need an API key?

Terra API takes an API key or an OAuth sign-in. Validic Inform needs an API key.

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

Terra API has a hosted endpoint at https://access.tryterra.co/api/v2/mcp/<user_id>. No hosted endpoint is listed for Validic Inform.


## For agents

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

## Other comparisons with Terra API or Validic Inform

- [1upHealth vs Terra API](https://www.anchorterminal.com/compare/1uphealth-vs-terra.md)
- [Aidbox vs Terra API](https://www.anchorterminal.com/compare/aidbox-vs-terra.md)
- [Health Gorilla vs Terra API](https://www.anchorterminal.com/compare/health-gorilla-vs-terra.md)
- [Medplum vs Terra API](https://www.anchorterminal.com/compare/medplum-vs-terra.md)
- [Metriport Medical API vs Terra API](https://www.anchorterminal.com/compare/metriport-vs-terra.md)
- [Particle Health vs Terra API](https://www.anchorterminal.com/compare/particle-health-vs-terra.md)
- [Redox vs Terra API](https://www.anchorterminal.com/compare/redox-vs-terra.md)
- [1upHealth vs Validic Inform](https://www.anchorterminal.com/compare/1uphealth-vs-validic.md)
- [Aidbox vs Validic Inform](https://www.anchorterminal.com/compare/aidbox-vs-validic.md)
- [Health Gorilla vs Validic Inform](https://www.anchorterminal.com/compare/health-gorilla-vs-validic.md)
- [Medblocks vs Terra API](https://www.anchorterminal.com/compare/medblocks-vs-terra.md)
- [Medblocks vs Validic Inform](https://www.anchorterminal.com/compare/medblocks-vs-validic.md)
- [Metriport Medical API vs Validic Inform](https://www.anchorterminal.com/compare/metriport-vs-validic.md)
- [Terra API vs Zus Health](https://www.anchorterminal.com/compare/terra-vs-zus-health.md)
- [Validic Inform vs Zus Health](https://www.anchorterminal.com/compare/validic-vs-zus-health.md)
- [ROOK vs Terra API](https://www.anchorterminal.com/compare/rook-vs-terra.md)
- [ROOK vs Validic Inform](https://www.anchorterminal.com/compare/rook-vs-validic.md)