| What it does | API for sending handwritten letters through AI agents and assistants
| Point-in-time market data API for backtesting and quantitative research
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| Stage | Not given
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| Founded | Not given
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| Based in | DE
| US
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| Pricing model | Not given
| Freemium
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| Pricing | Not given
| Free: 1,000 calls/day, last 12 months of data. Look-back history: $195 for 5 years (one-time), $290 for 10 years, $385 for 15 years, $480 for 20 years, $575 for 25 years, $670 for 30 years, plus $19.95/month for daily updates. Individual products: GEX from $29 per ticker, futures from $49 per market
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| Key features | - Agent policy configuration with send limits and approval settings
- Relationship management with contact details restricted from API
- Moment tracking for birthdays and anniversaries
- Letter quote and pricing with customizable upgrades
- Real-time send tracking with multiple status states
- Address request generation with privacy protection
- Webhook event system with signature verification
- OAuth support for custom connectors like Claude
| - 16,000+ US stocks including delisted names with 26+ years of history
- Point-in-time dealer gamma (GEX) for 11,209 stocks, ETFs and indexes since 2010
- 22,700+ macro series with historical vintages and revisions
- Intraday bars at 1-minute, 5-minute, 15-minute, 30-minute, hourly and daily resolutions
- SEC fundamentals and 13F institutional holdings point-in-time since 2013
- Python client with yfinance-style interface returning pandas DataFrames
- MCP server integration for AI agents including Claude and ChatGPT
- COT positioning data since 1986 for futures markets
- CSV and Parquet download formats with bulk file options
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| What makes it different | - Same API primitives used in the app itself
- Hands-on compliance with frequency limits and approval workflows
- Model Context Protocol integration for AI assistants
- Hosted MCP server with no installation required
| - Survivorship-free: includes 9,000+ delisted stocks that broker APIs omit for more realistic backtests
- Point-in-time accuracy prevents look-ahead bias in fundamentals and macro data
- All data accessible through single API without stitching multiple sources together
- Data ownership: purchased history is yours to download and keep forever
- Intraday bars back 26+ years unlike brokers that provide only 60 days
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 2 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 0 | 3 |
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| Citation Flow (Majestic) | 0 | 26 |
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| Referring domains (Majestic) | 0 | 18 |
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Maison Cartouche
FinzData