Stax Merchant API

The Merchant API from Stax — 7 operation(s) for merchant.

Operations 11

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

POST /merchant/{id}/registration/file Upload a file to a merchant's registration · Add File to Merchant Registration #
Ask an LLM
“Can I attach a voided check or ID document to a merchant's onboarding registration?”
“Is it possible to link an uploaded file to a specific registration document requirement?”
Tell an agent
Upload {file} named {name} to the registration of merchant {id}.
Attach {file} as {name} to merchant {id}'s registration document {registration_document_id}.
POST /merchant Create a merchant · Create a Merchant #
Ask an LLM
“How do I create a new merchant account on its own, without a user or registration?”
“Can I set the currency and reference when creating a merchant?”
Tell an agent
Create a merchant for {company_name} with contact {contact_name} at {contact_email}.
Create merchant {company_name} using currency {currency} and reference {reference}.
GET /merchant List and filter merchants · Get all Merchants #
Ask an LLM
“Which merchants do I manage, and what status is each in?”
“Can I find merchants that are on a risk hold?”
Tell an agent
List all of my merchants.
Find merchants whose company name is {company_name}.
POST /merchant/{id}/apikey Create an API key for a merchant · Create a New API Key for Merchant #
Ask an LLM
“Can I generate a new API key on behalf of a merchant I manage?”
“Is it possible to give a new merchant API key a name and team role?”
Tell an agent
Generate a new API key for merchant {id}.
Create an API key named {name} with role {team_role} for merchant {id}.
GET /merchant/{id}/apikey List a merchant's API keys · List API Keys for Merchant #
Ask an LLM
“Which API keys exist for one of my merchants?”
“Can I audit the API keys issued to a particular merchant account?”
Tell an agent
List the API keys for merchant {id}.
Show every API key issued to merchant {id}.
DELETE /merchant/{id}/registration/file/{file_id} Remove a file from a merchant's registration · Delete File from Merchant Registration #
Ask an LLM
“Can I delete a wrong document uploaded to a merchant's onboarding registration?”
“What happens if I remove a registration file from a merchant?”
Tell an agent destructive · confirm first
Delete file {file_id} from merchant {id}'s registration.
Remove registration file {file_id} for merchant {id}.
GET /merchant/{merchant_id} Get a merchant · Get Merchant by ID #
Ask an LLM
“What details does Stax hold for one specific merchant account?”
“Can I look up a merchant's status and contact info by ID?”
Tell an agent
Get merchant {merchant_id}.
Show the status and contact details of merchant {merchant_id}.
GET /merchant/{id}/registration Get a merchant's registration data · Get Merchant Registration Data #
Ask an LLM
“What onboarding information has a merchant submitted for underwriting?”
“Can I review the business and bank details on a merchant's registration?”
Tell an agent
Get the registration data for merchant {id}.
Show the underwriting registration details merchant {id} submitted.
PUT /merchant/{id}/registration Update a merchant's registration data · Update Merchant Registration Data #
Ask an LLM
“Can I fill in a merchant's business legal name and tax ID for onboarding?”
“Is it possible to update the bank account a merchant registered with?”
Tell an agent
Set merchant {id}'s registration legal name to {business_legal_name} and tax ID to {business_tax_id}.
Update merchant {id}'s registration bank routing {bank_routing_number} and account {bank_account_number}.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/stax:stax-merchant-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

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

OpenAPI Specification

stax-merchant-api-openapi.yml Raw ↑
openapi: 3.2.0
info:
  title: stax-api Merchant API
  version: '0.1'
servers:
- url: https://apiprod.fattlabs.com/
security:
- ApiKeyAuth: []
tags:


# --- truncated at 32 KB (168 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/openapi/stax-merchant-api-openapi.yml