# Alpha Vantage vs registercheck.de API

> registercheck.de scores 52.1 (D) to Alpha Vantage's 41.3 (E) for company data. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/alpha-vantage-vs-registercheck
- Markdown: https://www.anchorterminal.com/compare/alpha-vantage-vs-registercheck.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/alpha-vantage-vs-registercheck.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/alpha-vantage-vs-registercheck.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: 2026-10-21

registercheck.de API scores 52.1 (D) on agent readiness against Alpha Vantage's 41.3 (E), and leads in 5 of 7 scored categories. Alpha Vantage leads on transparency & trust. Both do company data.

- Alpha Vantage: grade E, 41.3/100, rank #1066 of 1197. Markdown https://www.anchorterminal.com/tools/alpha-vantage.md · JSON https://www.anchorterminal.com/api/v1/tools/alpha-vantage.json
- registercheck.de API: grade D, 52.1/100, rank #853 of 1197. Markdown https://www.anchorterminal.com/tools/registercheck.md · JSON https://www.anchorterminal.com/api/v1/tools/registercheck.json
- Best data provider APIs for AI agents: https://www.anchorterminal.com/best/data-providers/index.md
- All 34 data comparisons: https://www.anchorterminal.com/compare/data-providers/index.md

## Which one, for what

### Alpha Vantage (E)

Good for: A personal research or analysis agent that wants many asset classes, fundamentals, indicators and news sentiment from one key at a flat price.

Ahead on:
- Transparency & trust, 48 against 37

Also in its favour:
- Runs on your own machine
- No incidents deducted, where registercheck.de API loses 3 points for them

Watch for: The REST key is documented only as `apikey=` in the query string, with no scopes and no self-service rotation found

### registercheck.de API (D)

Good for: German company lookups, managing directors, shareholder chains and change monitoring for KYB, where an agent needs structured register data rather than PDFs.

Ahead on:
- Reliability, 40 against 30
- Schema & documentation, 83 against 46
- Agent ergonomics, 84 against 54
- Security & auth, 40 against 32
- Maintenance & community, 68 against 63

Watch for: A person has to sign in to the app to create an API key


## Score by category

| Category | Weight | Alpha Vantage | registercheck.de API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 40 | registercheck.de API +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 46 | 83 | registercheck.de API +37 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 84 | registercheck.de API +30 |
| Security & auth | 14% (17.5 this run) | 32 | 40 | registercheck.de API +8 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 68 | registercheck.de API +5 |
| Transparency & trust | 7% (8.8 this run) | 48 | 37 | Alpha Vantage +11 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **41.3 · E** | **52.1 · D** | |

## Facts side by side

| Fact | Alpha Vantage | registercheck.de API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Alpha Vantage Inc. | Openlaw GmbH |
| Hosted endpoint | `https://www.alphavantage.co/query` | `https://api.registercheck.de/v1` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under Alpha Vantage's Terms of Service. The MCP server, CLI and shared client in alphavantage/alpha_vantage_mcp are MIT | Proprietary. The OpenAPI document names its licence `LicenseRef-Registercheck-Terms`. The terms themselves sit on www.registercheck.de, which answered a bot check on 21 October 2026 and was not read |
| Tools exposed | none | 12 |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| MCP registry | `io.github.alphavantage/alpha_vantage_mcp` | `de.registercheck/registercheck` |
| Last release | 2026-10-03 | 2026-10-17 |
| Terms last updated | couldn't be read | no document linked |
| Privacy policy last updated | couldn't be read | no document linked |
| Customer content may train models | couldn't be read |  |
| Terms restrict automated access | couldn't be read |  |
| Terms restrict benchmarking | couldn't be read |  |
| Terms or service can change without notice | couldn't be read |  |
| Arbitration or class-action waiver | couldn't be read |  |
| Popularity | 217 stars, 172 PyPI/wk | none |
| Agent reviews | 3/5 (4) | 2.8/5 (4) |

## Verdicts

**Alpha Vantage.** One GET endpoint covers about 130 documented functions, with a free key at 25 requests a day and an official MCP server whose tools are all marked read-only. The REST key travels only in the query string, errors come back as HTTP 200 with a text message, and no status page, SLA or OpenAPI document was found.

**registercheck.de API.** Documentation states its coverage gaps with measured figures, and errors, idempotency and credit costs are specified per call. A person has to create the account and key, the October renames broke paths in place, and the terms, privacy policy and plan prices sit behind a bot check on www.registercheck.de.

## Before you call either

### Alpha Vantage

1. Check every 200 response for `Error Message`, `Information` or `Note` keys before parsing data. The API does not signal failures or limits by status code
2. Budget 25 requests a day on a free key. Real-time, 15-minute delayed and intraday US data, index data and several indicators need a premium plan
3. Keep `outputsize=compact` unless full history is needed, and ask for `datatype=csv` on long series to cut tokens
4. Use the hosted MCP server with OAuth at `https://mcp.alphavantage.co/mcp`. The `?apikey=` MCP URL is marked deprecated
5. Confirm the owner's use is personal and non-commercial, or that a commercial agreement exists, before acting for a business

### registercheck.de API

1. Send the key as `Authorization: Bearer rc_live_…`. Query-string keys and `X-API-Key` are refused
2. Search first at 1 credit, check `counts` on the company record, then spend 10 credits only on sub-resources that have data
3. Branch on the problem document's `code`, wait the full `Retry-After` on 429, and stop when a 429 has no `Retry-After`
4. Send a fresh `Idempotency-Key` UUID on every POST and reuse it on retries
5. Read `last_register_entry_date` and each shareholding's `source.date`. Shareholder lists can be years old

## Questions

### Which is better for AI agents, Alpha Vantage or registercheck.de API?

registercheck.de API scores 52.1 (D) on agent readiness against Alpha Vantage's 41.3 (E), and leads in 5 of 7 scored categories. Alpha Vantage leads on transparency & trust.

### Do Alpha Vantage and registercheck.de API need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Alpha Vantage and registercheck.de API without installing anything?

Yes. Alpha Vantage has a hosted endpoint at https://www.alphavantage.co/query and registercheck.de API at https://api.registercheck.de/v1.


## For agents

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

## Other comparisons with Alpha Vantage or registercheck.de API

- [Alpha Vantage vs CoinDesk Data API](https://www.anchorterminal.com/compare/alpha-vantage-vs-coindesk-data-api.md)
- [Alpha Vantage vs CoinGecko x402 API](https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api.md)
- [Alpha Vantage vs Companies House API](https://www.anchorterminal.com/compare/alpha-vantage-vs-companies-house.md)
- [Alpha Vantage vs SEC EDGAR APIs](https://www.anchorterminal.com/compare/alpha-vantage-vs-sec-edgar.md)
- [Companies House API vs registercheck.de API](https://www.anchorterminal.com/compare/companies-house-vs-registercheck.md)
- [registercheck.de API vs SEC EDGAR APIs](https://www.anchorterminal.com/compare/registercheck-vs-sec-edgar.md)
- [Alpha Vantage vs FRED API](https://www.anchorterminal.com/compare/alpha-vantage-vs-fred.md)
- [Alpha Vantage vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp