How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Need help?

Contact us
Abound

Abound W-9 API

The W-9 API from Abound — 2 operation(s) for w-9.

Documentation Provider Profile APIs.io OpenAPI GitHub

Abound W-9 API is one of 14 APIs that Abound publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include W-9. The published artifact set on APIs.io includes an OpenAPI specification and an AsyncAPI specification.

This API exposes 3 operations across 2 paths, and defines 26 schemas. It is described by OpenAPI 3.2.0, at version 4.

Requests are made against 2 base URLs: https://production-api.withabound.com, https://sandbox-api.withabound.com.

3 operations 2 paths 26 schemas 2 GET1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
4
Base URL
https://production-api.withabound.com
Authentication
HTTP Bearer
Resource Areas
1

Authentication & Security 1

Abound W-9 API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

  • bearerAuth — Bearer token. The token is the concatenation of your Abound appId and appSecret separated by a period, e.g. appIdxxx.appSecretyyy.

Paths & Operations 3

Across 2 paths, the API surfaces 3 operations — 2 GET, 1 POST. Each is listed below with its method, path, parameters, and response codes.

W-9 3
GET
/v4/documents/w-9
List all W-9 documents
formW9List 4 params → 200400401404500
POST
/v4/documents/w-9
Create a W-9
formW9Create 1 param body → 200400401404500
GET
/v4/documents/w-9/{documentId}
Retrieve a W-9
formW9Retrieve 1 param → 200400401404500

Schemas 26

The contract defines 26 schemas that model the data the API accepts and returns. The most detailed are W9FormFieldsSchema (9 properties), W9Schema (7 properties), AddressSchema (6 properties), ElectronicSignatureOfPayeeSchema (4 properties). Each schema is shown below with its type and property counts.

Page
integer
The specific page of results you're requesting. Responses are limited to a maximum of 100 records.
PayeeTinFingerprint
string
Filters the list of documents based on the payee.tinFingerprint field.
PayerSchema
The payer of the document.
W9ExemptPayeeCodeSchema
string
The code to identify a payee that is exempt from backup withholding.
TinVerificationStatusEnum
string
The status of the TIN Verification.
W9RequestSchema
object
4 properties 2 required
PayeeWithOptionalTinTypeRequestSchema
The payee of the document.
W9ExemptFatcaCodeSchema
string
The code to identify a payee that is exempt from reporting under FATCA.
IdempotencyKey
string
The unique key used to identify a request that has already been processed.
W9Schema
object
7 properties 5 required
DefaultErrorSchema
object
1 property 1 required
W9FormFieldsSchema
object
9 properties 1 required
PayerTinFingerprint
string
Filters the list of documents based on the payer.tinFingerprint field.
PayeeSchema
The payee of the document.
UserId
string
The unique identifier for a single end-user of your application.
ErrorBadRequestSchema
object
1 property 1 required
ErrorBadRequestSchemaErrorsItem
object
2 properties 1 required
DocumentId
string
The unique identifier for an existing document.
TinFingerprint
string
Your unique token that points to a TIN.
TinVerificationId
string
The unique identifier for the TIN Verification.
PayerRequestSchema
The payer of the document.
W9TaxClassificationSchema
string
The U.S. federal tax classification of the person.
ElectronicSignatureOfPayeeSchema
object
The electronic signature of the payee.
4 properties 4 required
AddressSchema
object
6 properties 2 required
TinTypeEnum
string
The type of the TIN. INDIVIDUAL refers to SSNs, ITINs, or ATINs. While BUSINESS refers to EINs.
PayeeRequestSchema
The payee of the document.

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

abound-w-9-api-openapi.yml Raw ↑

Other APIs Abound publishes across the network.

Abound 1099-INT API
AE Profile APIs.io
Abound 1099-K API
AE Profile APIs.io
Abound 1099-MISC API
AE Profile APIs.io
Abound 1099-NEC API
AE Profile APIs.io
Abound Access Tokens API
AE Profile APIs.io
Abound Electronic Delivery Consents API
AE Profile APIs.io
Abound Mailings API
AE Profile APIs.io
Abound Tax Treaties API
AE Profile APIs.io
Abound TIN Verifications API
AE Profile APIs.io
Abound Users API
AE Profile APIs.io
Abound W-8BEN API
AE Profile APIs.io
Abound W-8BEN-E API
AE Profile APIs.io
#W-9
← Back to A APIs
API Details
ID
abound:abound-w-9-api
Base URL
https://production-api.withabound.com
Docs
https://www.npmjs.com/package/@withabound/node-sdk
Provider
Abound
APIs.io →  GitHub →
Explore more
All APIs Providers APIs.io Network
Work with this as data

Every API here is available over the API and to AI agents over MCP. APIs is not yet its own endpoint on the v1 API. Reach this content through network search and the tag graph, or the MCP server below.

Installs https://mcp.apievangelist.com/mcp in Claude, Cursor, VS Code and the rest — one button, every client.

MCP tools for apis
4 tools reach this content
  • search_api_evangelistSearch every content type across the network at once.
  • find_relatedThe shared-tag relevance graph — what else covers this.
  • get_tagEverything one tag labels, across all content types.
  • guide_topicPRO — a curated bundle for a topic: area, guidance, rules, papers, stories, services.
All tools & prompts
Call it yourself
curl for this page
Search the network for this 
curl "https://api.apievangelist.com/v1/search?q=abound-w-9-api&limit=10"
Everything under a tag 
curl "https://api.apievangelist.com/v1/tags/abound-w-9-api"

Discovery needs no key. Full bodies and the synthesis endpoints are Pro.

Get an API key

Free tier, no email required. Sign in with whichever identity you already have.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have. Your account

Where this information came from

This is an independent, third-party profile of Abound W-9 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.