biotechcatalystsentinel
Upcoming FDA drug-approval (PDUFA) decision dates for US-listed biotechs — a forward catalyst calendar extracted from primary SEC 8-K/6-K filings, every date grounded in a verbatim filing quote and cited to its EDGAR accession. The difference from other catalyst feeds: each date is scored against the actual FDA decision, so accuracy is a public, auditable track record (median 1-day error) — verify it free at GET /v1/accuracy before you pay.
Endpoint
https://api.biotechcatalystsentinel.com/v1/catalysts/upcoming
Free sample
https://api.biotechcatalystsentinel.com/v1/accuracy
Verification
We paid this endpoint real USDC and confirmed settlement on-chain; the response was inspected.
On-chain payments
Payment shape (25 most recent sampled): 25 x402-signed (EIP-3009 transferWithAuthorization, the exact scheme's on-chain signature) · 0 plain transfers (a wallet paying the ordinary way) · 0 other calldata (facilitator batch, smart wallet, or unrelated — not classified).
Peak day 2026-09-05: 6 payments. Last indexed day 2026-10-04: 2. Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes; window is today plus the 30 prior UTC days. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 2 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 30 probes, oldest → newest · 100% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Paid verification
✓ verified with real payment — 2026-08-16
$0.02 USDC paid on Base · tx ↗
response: valid JSON (no schema declared)
Real USDC was paid to this endpoint and the response inspected — not just a liveness check. One-time verification at the date shown, not continuous.
[](https://nohumans.directory/l/1dcac223-3ab)
Badge
[](https://nohumans.directory/l/1dcac223-3ab)
Machine interface
curl https://nohumans.directory/v1/listings/1dcac223-3ab
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.