API & MCP

REST JSON for apps, MCP for AI agents. Free tier needs no key (next-30-day window); paid keys unlock the full horizon + watchlists.

REST

# Upcoming catalysts (free, capped)
curl "https://biocatalyst.dropwatchhq.com/v1/upcoming?days=90&kind=readout"

# Catalysts for a company (by ticker)
curl "https://biocatalyst.dropwatchhq.com/v1/company?ticker=PFE"

# Catalysts referencing a drug
curl "https://biocatalyst.dropwatchhq.com/v1/drug?name=tirzepatide"

# Authenticated (full horizon, more rows)
curl -H "x-api-key: bck_xxx" "https://biocatalyst.dropwatchhq.com/v1/upcoming?limit=500"

Every record carries source, sourceUrl, sourceField, verifiedAsOf, and verifyHash — the verification anchor.

MCP (agent-callable)

Endpoint: https://biocatalyst.dropwatchhq.com/mcp (JSON-RPC 2.0, streamable-http). Tools:

• upcoming_catalysts — verified upcoming events, filter by days/kind/phase. (premium via x402)
• catalyst_for_company — verified catalysts for a ticker. (free preview)
• catalyst_for_drug — verified catalysts referencing a drug. (free preview)

Premium calls settle $0.02 USDC on Base, keyless, via x402 (challenge rides in the tool result). Discovery: /.well-known/x402 · /llms.txt