MethodFi Simulate Entities API is one of 44 APIs that MethodFi publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Simulate Entities. The published artifact set on APIs.io includes an OpenAPI specification.
This API exposes
3 operations
across 3 paths,
and defines 44 schemas.
It is described by OpenAPI 3.2.0, at version 2025-12-01.
Requests are made against 3 base URLs: https://production.methodfi.com, https://sandbox.methodfi.com, https://dev.methodfi.com.
3 operations3 paths44 schemas3 POST
Metadata
The identity and technical contract details declared by the specification.
MethodFi Simulate Entities API declares
2 security schemes
for authenticating requests.
It accepts HTTP bearer tokens (OpalToken).
It accepts HTTP bearer tokens (SecretKey).
By default, every request must be authenticated.
OpalToken — Opal token authentication for Opal session endpoints. Use an Opal token (otkn...) as the Bearer token. Created via POST /opal/token using a secret key.
SecretKey — Secret key authentication. Use your team's secret key (sk...) as the Bearer token. All authenticated API endpoints require this scheme unless otherwise noted.
Paths & Operations 3
Across 3 paths, the API surfaces 3 operations — 3 POST. Each is listed below with its method, path, parameters, and response codes.
The contract defines 44 schemas that model the data the API accepts and returns. The most detailed are Account (26 properties), AccountUpdate (17 properties), AccountVerificationSession (17 properties), AccountCardBrand (12 properties). Each schema is shown below with its type and property counts.
AccountDebitCard
objectnull
Debit card account details. Present when type is debitcard.
3 properties
ErrorEnvelope
object
3 properties3 required
ResourceError
objectnull
4 properties3 required
AccountExpandableUpdate
The latest update ID. This field is expandable. When expanded, returns the full AccountUpdate object.
EntityAttributeData
objectnull
Financial health and credit attribute data.
9 properties
AccountAttribute
object
An attribute record for an account containing financial data attributes.
7 properties6 required
MerchantType
string
EntityAttributeResponse
AccountExpandableCardBrand
The latest card brand ID. This field is expandable. When expanded, returns the full AccountCardBrand object.
AccountClearing
objectnull
Clearing account details. Present when type is clearing.
3 properties
CreditScoreResourceError
objectnull
Error details when a credit score pull fails.
4 properties4 required
AccountPaymentInstrument
object
A payment instrument for an account.
11 properties6 required
AccountSensitive
object
Sensitive data for an account.
8 properties7 required
AccountLiability
objectnull
Liability account details. Present when type is liability.
7 properties7 required
AccountCardBrand
object
Card brand information for an account.
12 properties5 required
AccountSensitiveResourceError
objectnull
Error details when retrieving account sensitive data fails.
4 properties4 required
AccountExpandableSensitive
The latest sensitive ID. This field is expandable. When expanded, returns the full AccountSensitive object.
AccountVerificationSessionResourceError
objectnull
Error details when an account verification session fails.
4 properties4 required
BalanceResourceError
objectnull
Error details when a balance sync fails.
4 properties4 required
Merchant
object
8 properties8 required
EntityConnect
object
9 properties8 required
AccountUpdate
object
An update record for an account.
17 properties6 required
AccountVerificationSession
object
A verification session for an account.
17 properties6 required
AccountExpandableAttribute
The latest attribute ID. This field is expandable. When expanded, returns the full AccountAttribute object.
ConnectResourceError
objectnull
Error details when a connect session fails.
4 properties4 required
EntityConnectResponse
AccountExpandablePaymentInstrument
The latest payment instrument ID. This field is expandable. When expanded, returns the full AccountPaymentInstrument object.
AccountExpandableBalance
The latest balance ID. This field is expandable. When expanded, returns the full AccountBalance object.
Account
object
An Account represents a financial account (ACH, liability, clearing, or debit card) associated with an Entity. The type field indicates which nested details ob…
26 properties9 required
AccountACH
objectnull
ACH account details. Present when type is ach.
3 properties
AccountExpandablePayoff
The latest payoff ID. This field is expandable. When expanded, returns the full AccountPayoff object.
SuccessEnvelope
object
Standard envelope for successful responses that return a single payload.
3 properties3 required
Metadata
objectnull
Arbitrary key-value metadata attached to the resource.
PayoffResourceError
objectnull
Error details when a payoff sync fails.
4 properties4 required
AccountBalance
object
A balance record for an account.
7 properties6 required
MerchantProviderIds
object
5 properties
AccountResourceError
objectnull
Error details when an account is disabled.
4 properties4 required
EntityCreditScoreResponse
EntityCreditScoreFactor
object
2 properties
EntityAttribute
object
7 properties6 required
UpdateResourceError
objectnull
Error details when an account update fails.
4 properties4 required
EntityCreditScore
object
7 properties6 required
AccountPayoff
object
A payoff record for an account.
9 properties8 required
ErrorObject
object
4 properties3 required
Specification
The full machine-readable OpenAPI contract behind this narrative.
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