River Markets markets API
Search and discover prediction markets across Kalshi and Polymarket.
River Markets markets API is one of 13 APIs that River Markets publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Markets. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, and a getting-started guide.
This API exposes 4 operations across 4 paths, and defines 8 schemas. It is described by OpenAPI 3.2.0, at version 1.0.0.
Requests are made against a single base URL, https://api.rivermarkets.com.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 4
River Markets markets API declares
4 security schemes
for authenticating requests.
An API key is passed in the header as X-River-Key-Id (SignedRequestKeyId).
An API key is passed in the header as X-River-Timestamp (SignedRequestTimestamp).
An API key is passed in the header as X-River-Signature (SignedRequestSignature).
It accepts HTTP bearer tokens (BearerAuth).
By default, every request must be authenticated.
SignedRequestKeyId— UUID of your API key (from Settings → API Keys).SignedRequestTimestamp— Current unix seconds. Must be within 30s of server time.SignedRequestSignature— Base64 Ed25519 signature over the canonical request: METHOD\nPATH\nSORTEDQUERY\nTIMESTAMP\nSHA256(body) hex. See /api-reference/authentication for the full rec…BearerAuth— JWT bearer token for web client authentication.
Paths & Operations 4
Across 4 paths, the API surfaces 4 operations — 3 GET, 1 POST. Each is listed below with its method, path, parameters, and response codes.
Search and discover prediction markets across Kalshi and Polymarket.
Schemas 8
The contract defines 8 schemas that model the data the API accepts and returns. The most detailed are MarketSearchResult (31 properties), ValidationError (5 properties), MarketSearchResponse (4 properties), MarketMatchBatchResponse (3 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from River Markets 12
Other APIs River Markets publishes across the network.
This is an independent, third-party profile of River Markets markets API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.