---
title: "WATCHER: get a signed callback when a new news article is..."
method: POST
path: "/api/watchers/company-news"
tags: ["watchers"]
---

# WATCHER: get a signed callback when a new news article is...

`POST /api/watchers/company-news`

## Request

- Base URL: `https://2s.io`
- URL: `https://2s.io/api/watchers/company-news`
- Auth: API key in header `PAYMENT-SIGNATURE`

WATCHER: get a signed callback when a new news article is published about a US company. Arm once, pay once. Pass ticker; optionally keyword to only fire on headlines containing it. Fires once per new article (deduped by id); bounded by maxFires/expiry. Existing articles at arm time are baselined. News via Finnhub. Signed (verify offline) + retried; recoverable via watchers.status. Returns a watcherId.

## Request body

- object
  - `ticker` string, required: US-listed ticker, e.g. AAPL.
  - `keyword` string: Optional: only fire on headlines containing this text (case-insensitive).
  - `callbackUrl` string, uri, required: Signed event POSTed here (verify X-2s-Signature). Any http(s) URL.
  - `payload` object: Arbitrary JSON echoed back in every callback.
  - `expiresInSeconds` integer: Active window in seconds (default 30d, max 90d).
  - `maxFires` integer: Stop after this many articles (default 25).
  - `label` string: Optional free-text tag.

## Other responses

- `200` (unresolved $ref)
- `400`: Invalid request — not charged. error.code: BAD_REQUEST or INVALID_PARAM (parameter validation; error.details.issues lists each problem), MALFORMED_JSON, or a request-specific code. Other client errors: 405 METHOD_NOT_ALLOWED (wrong verb; see the Allow header), 413 PAYLOAD_TOO_LARGE.
- `402`: Payment required. Body is the x402 PaymentRequirements envelope with a multi-network accepts array; the per-call price is in accepts[].amount (and on the operation as x-2s-price). Sign for whichever rail you hold USDC on (EIP-3009 for Base, partial SPL transfer for Solana) and retry with the PAYMENT-SIGNATURE header (X-PAYMENT also accepted for v1 clients). Also PAYMENT_SETTLE_FAILED (error envelope) when a verified payment failed to settle: error.details.chargeStatus is "not_charged" (retry with a fresh payment) or "unknown" (the authorization may still settle before its deadline — check it before retrying).
- `404`: Not found — NOT_FOUND (or NO_SOURCES / NO_OPINIONS): the requested entity does not exist. Not charged.
- `429`: Too many requests — RATE_LIMITED: our per-IP / per-payer limiter. Not charged; retry after Retry-After.
- `5XX`: Server-side failure. 500 INTERNAL: unexpected error; quote error.errorId (also the X-2s-Error-Id header). 502 UPSTREAM_UNAVAILABLE (or another UPSTREAM_* code): the data provider failed — composite endpoints refuse unbilled when every source fails. 503 SERVICE_PAUSED: endpoint paused by the operator kill switch, retry after Retry-After; 503 SPEND_CAP: daily upstream budget exhausted. 504 UPSTREAM_TIMEOUT. Not charged.

---

[API](https://skmtc.dev/2s-io/apis/2s-the-most-everything-api.md) · [All operations](https://skmtc.dev/2s-io/apis/2s-the-most-everything-api/llms.txt) · [OpenAPI document](https://skmtc.dev/2s-io/apis/2s-the-most-everything-api/revisions/da4c5caf686e?raw)