# Prosper

**Canonical:** https://apis.io/providers/prosper/  
**Website:** https://www.prosper.com  
**APIs profiled:** 1

Prosper Marketplace operates one of the largest peer-to-peer (marketplace) lending platforms in the United States, matching individual and institutional investors with consumers seeking personal loans, and also offering a HELOC and a credit-card product. For investors, Prosper publishes a RESTful Investor API that lets individual, institutional, and third-party agents connect directly to the platform to view account balances, search active loan listings, place orders (bids) to purchase Notes, and track owned Notes, loans, and payments. The API uses OAuth 2.0 over SSL with comprehensive filtering and sorting, and offers a sandbox environment for integration testing. This profile was surfaced as a portfolio company of Emergence Capital, IVP, and QED Investors and enriched from Prosper's public developer documentation.

## Kin Score — 27.7 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 27.7).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 0.0 |
| Governance | 4.5 |
| Contract Governance | 4.5 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 66.1 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

## Agent readiness — 9.6 (agent-aware)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (1)

- **Prosper Investor API** — RESTful API for Prosper investors and third-party agents to view account information, search active loan listings, place orders to purchase Notes, and retrieve owned Notes, inve...

## MCP servers (1)

- **Prosper MCP Server**

## Security (2)

- **Prosper Authentication** — oauth2 · 3 schemes
- **Prosper Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Fintech, Lending, Peer-to-Peer Lending, Marketplace Lending, Investing, Personal Loans, Consumer Credit, Financial-Services

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