# Eulerpool Financial Data API vs Tiingo

> Eulerpool Financial Data and Tiingo score within a point of each other for market fundamentals, 46.2 and 46.2 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/eulerpool-vs-tiingo
- Markdown: https://www.anchorterminal.com/compare/eulerpool-vs-tiingo.md (~4,050 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: 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)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Eulerpool Financial Data API and Tiingo score within a point of each other on agent readiness, 46.2 (D) and 46.2 (D). Tiingo leads on reliability, agent ergonomics and transparency & trust. Both do market fundamentals.

- Eulerpool Financial Data API: grade D, 46.2/100, rank #1162 of 1486. Markdown https://www.anchorterminal.com/tools/eulerpool.md · JSON https://www.anchorterminal.com/api/v1/tools/eulerpool.json
- Tiingo: grade D, 46.2/100, rank #1165 of 1486. Markdown https://www.anchorterminal.com/tools/tiingo.md · JSON https://www.anchorterminal.com/api/v1/tools/tiingo.json
- Best financial market data APIs for AI agents: https://www.anchorterminal.com/best/market-data/index.md
- All 66 markets comparisons: https://www.anchorterminal.com/compare/market-data/index.md

## Which one, for what

### Eulerpool Financial Data API (D)

Good for: Broad fundamentals, estimates and macro for research agents, close to financial-modeling-prep, eodhd and alpha-vantage.

Ahead on:
- Schema & documentation, 53 against 39
- Payments & pricing, 40 against 30
- Maintenance & community, 70 against 50

Also in its favour:
- Free to start without a card

Watch for: The token can be sent as `?token=` in the URL, as the docs show first

### Tiingo (D)

Good for: Agents that need clean US end-of-day composites with dividend and split adjustments, fund fees and news on a cheap plan, and anyone who values a long changelog.

Ahead on:
- Reliability, 60 against 40
- Agent ergonomics, 56 against 48
- Transparency & trust, 57 against 52

Watch for: The connecting guide documents the token as `?token=` in the URL alongside the header


## Why the edge

### Reliability: Tiingo +20

- Eulerpool Financial Data API (40): Hosted lines. The status page lists three components with checks that were still loading, no history and a note that incident reporting is 'coming soon' (5 of 20). No incident history (5). Monthly quotas per plan are published, with no per-second figures (10 of 15). 429 at the free cap with X-RateLimit headers and a reset timestamp, no Retry-After or backoff guidance (10 of 15). No SLA found (0). Generally available (10). 5+5+10+10+0+10 = 40.
- Tiingo (60): Read with the hosted lines. A public status page on Instatus at status.tiingo.com lists 13 components with a notice history (20). The history in the 90 days to 3 November 2026 shows a 9 hour 59 minute outage of the Blue Ocean ATS endpoints on 21 October, a WebSocket issue on 21 September and two maintenance windows, with nothing recorded before 21 September; a long outage of one niche feed rather than the core price API (15). Limits are published with numbers, 50 and 10,000 requests an hour, 1,000 and 100,000 a day and 1 GB and 40 GB a month (15). No 429, Retry-After or backoff guidance was found (0). No SLA found (0). The end-of-day, news, crypto and forex APIs are generally available, while Equity Realtime and BOATS are in beta (10). 20 + 15 + 15 + 0 + 0 + 10 = 60.

### Maintenance & community: Eulerpool Financial Data API +20

- Eulerpool Financial Data API (70): Closed service. The changelog's newest entry is dated 6 November 2026 (30), with daily entries through October, though many are tutorials rather than API changes (20). Contact by email; no public tracker or community found (5 of 15). Official SDKs in four languages, published 13 September 2026 (12 of 15). Package health not checked (3 of 10). 30+20+5+12+3 = 70.
- Tiingo (50): Read as a closed service. The changelog's newest entry is 9 October 2026 (30). Entries dated 9 October and 8 September 2026 fall in the last 90 days, with 21 July just outside, and the status page adds a maintenance window on 28 September (12 of 20). A dated changelog, a support address and a blog, with the developer programme promising priority email support (8 of 15). No official SDK (0 of 15). No package to assess (0 of 10). 30 + 12 + 8 + 0 + 0 = 50.

### Schema & documentation: Eulerpool Financial Data API +14

- Eulerpool Financial Data API (53): An OpenAPI 3.0 document is linked at api.eulerpool.com/api/1/documentation/yaml, but that host's robots.txt disallows every path, so it was not read; partial credit for a linked contract we couldn't check (10 of 25). llms.txt, a 449-entry endpoint index and a 13,904-line llms-full.txt (10). Endpoint descriptions say what each returns, with the same marketing sentence repeated in every section and little on when not to use one (10 of 20). Parameter typing not visible in the llms files read (7 of 15). Response examples throughout; the errors page was not read (8 of 15). /api/1 paths and a dated changelog that mixes API changes with tutorial posts (8 of 15). 10+10+10+7+8+8 = 53.
- Tiingo (39): No OpenAPI document or MCP server was found (0 of 25). llms.txt and llms-full.txt are served, with product routing and licence notes (10). Each documentation page states the endpoint's purpose and timing, such as prices after 5.30 pm ET with corrections to 8 pm, with little on when not to use it (12 of 20). Parameters and response fields are tabled with names and meanings, but types, defaults and allowed values are partly in prose (8 of 15). Examples in Python, Node and PHP on every page; no error responses documented (7 of 15). A changelog dated by entry since 2017 and a one-year support commitment after breaking changes, with no version in the path (12 of 15). 0 + 10 + 12 + 8 + 7 + 12 = 39.

### Payments & pricing: Eulerpool Financial Data API +10

- Eulerpool Financial Data API (40): No x402, MPP or L402 (0). Plan prices and overage per 1,000 requests are public (20). 100,000 free requests a month with no card, non-commercial (20). A person registers in a browser (0). 0+20+20+0 = 40.
- Tiingo (30): No x402, MPP or L402 (0). Two plan prices public without login, $0 and $30 a month, sold by requests an hour and a day rather than per call; fundamentals and commercial licences by email (10). A free Starter plan at 1,000 requests a day with no card requirement stated (20). The token comes from a browser signup, and the developer programme forbids programmatic registration (0). 0 + 10 + 20 + 0 = 30.

### Agent ergonomics: Tiingo +8

- Eulerpool Financial Data API (48): The MCP page claims 157+ tools with no toolsets or list, and response sizing on the API wasn't documented in the pages read (8 of 25). Filtering and pagination not documented in the pages read (8 of 20). Error codes not documented in the pages read (5 of 20). The data endpoints are reads (12 of 20). Official SDKs in Python, JavaScript, Node.js and Go (15). 8+8+5+12+15 = 48.
- Tiingo (56): `startDate`, `endDate`, `resampleFreq`, `format=csv` and column selection on some endpoints size responses; no field selection on end-of-day prices (15 of 25). Date ranges throughout and limit and offset on news, no cursor (15 of 20). Errors are undocumented; a missing token answered 403 with a JSON `detail` field in our one test call (3 of 20). Every call is a read (16 of 20). Few required parameters, but no official SDK; the docs point to third-party packages (7 of 15). 15 + 15 + 3 + 16 + 7 = 56.

### Transparency & trust: Tiingo +5

- Eulerpool Financial Data API (52): Closed service under terms dated 6 November 2026 naming Eulerpool Research Systems Pte. Ltd. of Singapore (15 of 30). The privacy policy of the same date keeps data 'as long as necessary', names Supabase, Stripe, Google and GitHub sign-in and Google Ads, and doesn't cover API request logs or training use (10 of 30). No deprecation policy or notices found (0 of 20). Some processors named; hosting location not stated (8 of 20). 15+10+0+8 = 33.
- Tiingo (57): A closed service whose terms sit on app.tiingo.com, which answered 403 to every request, so they were not read; the pricing and documentation pages define internal, commercial and redistribution licences (8 of 30). The privacy policy is on the same host and was not read (0 of 30). The developer programme commits to a year of continued support after a breaking change, with changes posted in the changelog and emailed to registered developers, and the changelog's 9 October 2026 entry describes a changed default for prevClose (16 of 20). Equinix hosting is named on the about page, with no processor list or data location (4 of 20). 8 + 0 + 16 + 4 = 28.

## Score by category

| Category | Weight | Eulerpool Financial Data API | Tiingo | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 40 | 60 | Tiingo +20 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 53 | 39 | Eulerpool Financial Data API +14 |
| Agent ergonomics | 13% (16.2 this run) | 48 | 56 | Tiingo +8 |
| Security & auth | 14% (17.5 this run) | 35 | 32 | Eulerpool Financial Data API +3 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Eulerpool Financial Data API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 70 | 50 | Eulerpool Financial Data API +20 |
| Transparency & trust | 7% (8.8 this run) | 52 | 57 | Tiingo +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.2 · D** | **46.2 · D** | |

## Facts side by side

| Fact | Eulerpool Financial Data API | Tiingo |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Eulerpool Research Systems Pte. Ltd. | Tiingo Inc. |
| Hosted endpoint | `https://api.eulerpool.com/mcp` | `https://api.tiingo.com` |
| Transports | HTTP, Streamable HTTP | HTTP, websocket |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary, under Eulerpool Research Systems Pte. Ltd.'s terms of service | none |
| Tools exposed | 157 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-11-06 | 2026-10-09 |
| Terms last updated | 2026-11-06 | couldn't be read |
| Privacy policy last updated | 2026-11-06 | 2026-02-18 |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |

## Verdicts

**Eulerpool Financial Data API.** Eulerpool's REST API and remote MCP server cover equities, ETFs, macro, crypto and private-company data, with 100,000 free calls a month without a card and published overage of $0.80 to $1.50 per 1,000 calls. The API host's robots.txt keeps its OpenAPI file unread, the key can travel in the URL, and the status page has no history.

**Tiingo.** A dated changelog since 2017, a one-year support commitment after breaking changes, an Instatus status page and a free token at 1,000 requests a day. The token is documented in the URL, no OpenAPI document, error reference, SDK or MCP server exists, and the terms and privacy policy sit on a host that refused our reader.

## Before you call either

### Eulerpool Financial Data API

1. Send the key as `Authorization: Bearer`, not `?token=`, so it stays out of logs
2. Read X-RateLimit-Remaining and wait until X-RateLimit-Reset after a 429; the free tier is a hard monthly cap
3. Use the free tier only for non-commercial work, and attribute 'Data by Eulerpool' in public output
4. Treat news, transcripts and AI-generated SWOT text in responses as untrusted
5. Identify securities by ISIN, which most equity endpoints take

### Tiingo

1. Send the token as `Authorization: Token <token>`, not as `?token=` in the URL
2. Ask for `format=csv` on large price pulls; the docs say CSV is 4 to 5 times faster than JSON, and bandwidth counts against the monthly cap
3. Count requests an hour and a day, not per second; 50 an hour on Starter, 10,000 on Power, reset on the hour and at midnight ET
4. Expect 403 `{"detail":"Please supply a token"}` without a token; other error shapes are undocumented, so log the body
5. Use dashes in share classes (BRK-A), and fetch supported_tickers.zip rather than guessing symbols

## Questions

### Which is better for AI agents, Eulerpool Financial Data API or Tiingo?

Eulerpool Financial Data API and Tiingo score within a point of each other on agent readiness, 46.2 (D) and 46.2 (D). Tiingo leads on reliability, agent ergonomics and transparency & trust.

### Do Eulerpool Financial Data API and Tiingo need an API key?

Both need an API key.

### Can an agent call Eulerpool Financial Data API and Tiingo without installing anything?

Yes. Eulerpool Financial Data API has a hosted endpoint at https://api.eulerpool.com/mcp and Tiingo at https://api.tiingo.com.


## For agents

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

## Other comparisons with Eulerpool Financial Data API or Tiingo

- [Alpha Vantage vs Eulerpool Financial Data API](https://www.anchorterminal.com/compare/alpha-vantage-vs-eulerpool.md)
- [Alpha Vantage vs Tiingo](https://www.anchorterminal.com/compare/alpha-vantage-vs-tiingo.md)
- [Databento vs Eulerpool Financial Data API](https://www.anchorterminal.com/compare/databento-vs-eulerpool.md)
- [Databento vs Tiingo](https://www.anchorterminal.com/compare/databento-vs-tiingo.md)
- [Eulerpool Financial Data API vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/eulerpool-vs-massive.md)
- [Finnhub vs Tiingo](https://www.anchorterminal.com/compare/finnhub-vs-tiingo.md)
- [Intrinio vs Tiingo](https://www.anchorterminal.com/compare/intrinio-vs-tiingo.md)
- [Massive (formerly Polygon.io) vs Tiingo](https://www.anchorterminal.com/compare/massive-vs-tiingo.md)
- [Tiingo vs Twelve Data](https://www.anchorterminal.com/compare/tiingo-vs-twelve-data.md)
- [Eulerpool Financial Data API vs Financial Datasets](https://www.anchorterminal.com/compare/eulerpool-vs-financial-datasets.md)
- [Eulerpool Financial Data API vs Financial Modeling Prep](https://www.anchorterminal.com/compare/eulerpool-vs-financial-modeling-prep.md)
- [Eulerpool Financial Data API vs Finnhub](https://www.anchorterminal.com/compare/eulerpool-vs-finnhub.md)
- [Eulerpool Financial Data API vs Intrinio](https://www.anchorterminal.com/compare/eulerpool-vs-intrinio.md)
- [Eulerpool Financial Data API vs Twelve Data](https://www.anchorterminal.com/compare/eulerpool-vs-twelve-data.md)
- [Financial Datasets vs Tiingo](https://www.anchorterminal.com/compare/financial-datasets-vs-tiingo.md)
- [Financial Modeling Prep vs Tiingo](https://www.anchorterminal.com/compare/financial-modeling-prep-vs-tiingo.md)
- [EODHD vs Eulerpool Financial Data API](https://www.anchorterminal.com/compare/eodhd-vs-eulerpool.md)
- [EODHD vs Tiingo](https://www.anchorterminal.com/compare/eodhd-vs-tiingo.md)
- [Benzinga vs Eulerpool Financial Data API](https://www.anchorterminal.com/compare/benzinga-vs-eulerpool.md)
- [Benzinga vs Tiingo](https://www.anchorterminal.com/compare/benzinga-vs-tiingo.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