# CapMAC Holdings

**Canonical:** https://apis.io/providers/capmac/  
**APIs profiled:** 0

CapMAC Holdings Inc. (Capital Markets Assurance Corporation) was a New York-based holding company that provided financial guaranty and surety insurance for structured securities worldwide, primarily asset-backed securities, alongside structured financial solutions, advisory and structuring services, and investment management. Founded in 1973 and headquartered at 885 Third Avenue in New York City, it was a Canaan Partners portfolio company. MBIA Inc. acquired CapMAC Holdings in a stock swap valued at more than $500 million, completing the merger on February 17, 1998, after which CapMAC operated as an indirect wholly-owned MBIA subsidiary. Capital Markets Assurance Corporation was merged into MBIA Insurance Corporation during the third quarter of 2010 and ceased to exist as a separately licensed insurer. The company is defunct and operates no website, developer program, or API surface; the capmac.com domain is an unrelated parked domain listed for sale.

## Kin Score — 0.9 / 100 (minimal)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 0.9).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Insurance**: 0.0 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Tags

Company, Financial-Services, Insurance, Financial Guaranty, Structured Finance, Asset-Backed Securities, Defunct, Acquired

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/capmac/). Scores are computed from the provider's own public artifacts under a published rubric.