# bellwether-markets

**Canonical:** https://apis.io/providers/bellwether-markets/  
**Website:** https://bellwether.markets/  
**APIs profiled:** 1

Bellwether Markets provides a unified API that aggregates prediction market data from major platforms like Kalshi and Polymarket. By normalizing disparate schemas into a single, developer‑friendly REST and MCP interface, it enables easy access to market listings, detailed market data, and cross‑venue arbitrage opportunities. The service offers free tier access with generous rate limits, supporting both real‑time data retrieval and integration into AI agents for automated trading strategies. Backed by YC and built after Polymarket’s acquisition, Bellwether aims to simplify the fragmented prediction market landscape for developers and traders alike.

## Kin Score — 23.4 / 100 (emerging)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 61.7 |
| Contract Quality | 6.7 |
| Contract Governance | 79.1 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 23.1 |
| Access Clarity | 10.5 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 10.8 (matched via fallback).

## Agent readiness — 13.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | unknown |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | derived |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |

## APIs (1)

- **Bellwether Markets API** — Unified prediction-market data API aggregating Kalshi and Polymarket.

## MCP servers (1)

- **bellwether-markets MCP Server** — Remote MCP server at mcp.baseframelabs.com.

## Agentic access (1)

- **Bellwether Markets Agentic Access** — 4 operations

## Security (1)

- **Bellwether Markets Domain Security** — TLSv1.3

## Tags

Company, Prediction-Market, API, FinTech, Data-Aggregation

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