# Waystar

**Canonical:** https://apis.io/providers/waystar/  
**Website:** https://www.waystar.com/  
**APIs profiled:** 7

Waystar is a healthcare payments and revenue cycle management (RCM) software company that operates a national clearinghouse connecting providers to payers. Its cloud platform spans financial clearance (eligibility, prior authorization, patient estimation), claim management, payment and remittance management, and denial prevention and recovery. Waystar exposes integration through REST APIs, web services, HL7, sFTP/batch, RPA, and X12 EDI transactions (270/271 eligibility, 276/277 claim status, 837 claims, 835 remittance/ERA, 278 authorization). API access is delivered through a partner/developer program at developer.waystar.com; the portal renders its full documentation navigation to anyone but serves a login form in place of every document body, and sandbox accounts are provisioned by email rather than self-service. Waystar publishes no OpenAPI, no llms.txt, no MCP server, no agent card and no client SDK in any package registry. Authentication is six hand-rolled schemes rather than one - HMAC-SHA1 body signatures on the classic Developer Suite, HMAC-SHA256 Authorization headers on Patient Estimation, credentials in the POST body on the eligibility gateway, HTTP Basic, WS-Security UsernameToken inside CAQH CORE SOAP envelopes, and X.509 client certificates - with no OAuth 2.0 and no OpenID Connect anywhere. The API surface below is documented from Waystar's public product pages, its developer-portal structure and the underlying X12 standards rather than from a published machine-readable definition.

## Kin Score — 46.2 / 100 (developing)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (-0.7 from 46.9).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 0.0 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 60.5 |
| Developer Ergonomics | 64.3 |
| Commercial Clarity | 63.2 |
| Access Clarity | 63.2 |

Regulatory layer — **Health**: 46.3 (matched via tags).

## Agent readiness — 11.2 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | documented |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| 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 |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (7)

- **Waystar Eligibility Verification API** — Real-time and batch insurance eligibility and benefits verification, exchanging X12 270 inquiries and 271 responses to confirm coverage, plan details, copays, deductibles, and s...
- **Waystar Authorization & Referral API** — Automates prior authorization and referral determination and status, modeled on the X12 278 health care services review request/response. Covers submitting authorization request...
- **Waystar Patient Estimation API** — Produces pre-service, good-faith patient cost estimates by combining eligibility/benefit data, contracted rates, and procedure codes to support price transparency and up-front p...
- **Waystar Claim Management API** — Submits, scrubs, edits, tracks, and manages professional, institutional, and dental claims through Waystar's clearinghouse, modeled on the X12 837P/837I/837D claim transaction s...
- **Waystar Claim Status API** — Queries and monitors claim status across payers, modeled on the X12 276 status inquiry and 277 status response - returning received, accepted, pending, denied, and paid states. ...
- **Waystar Remittance & ERA API** — Retrieves electronic remittance advice (835/ERA), payments, and adjustments for automated payment posting and reconciliation, with raw X12 835 artifacts and parsed JSON. Modeled...
- **Waystar Denial & Appeal Management API** — Identifies denied claims, exposes denial and remark codes and explanation-of-benefits detail, and supports appeal creation, packaging, and resubmission workflows. Modeled from W...

## Security (3)

- **Waystar Authentication** — hmac-signature/http-basic/credentials-in-payload/ws-security-usernametoken/mutualTLS/saml2-sso · 9 schemes
- **Waystar Domain Security** — TLSv1.3 · DMARC
- **Waystar Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Plans (1)

- **Waystar Plans Pricing**

## Tags

Healthcare, Revenue Cycle Management, RCM, Clearinghouse, Healthcare Payments, Medical Billing, X12 EDI, Eligibility, Claims, Remittance

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