The Griffin API

Name: The Griffin API
Brand: The Griffin API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentFinanceBankingapiKey69 EndpointsREST

For Agents

Open and close UK bank accounts, run KYC admissions, submit payments, and query transactions through Griffin's banking-as-a-service API.

Connect the The Griffin API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the The Griffin API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Install Jentic One Beta (Self-Hosted)

Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with The Griffin API.

Open and inspect bank accounts under an organisation with /v0/bank/accounts/{bank-account-id}

Close a bank account via POST /v0/bank/accounts/{bank-account-id}/actions/close

Create and list payments on an account with /v0/bank/accounts/{bank-account-id}/payments

Read individual transactions through GET /v0/bank/transactions/{transaction-id}

GET STARTED

Start building with The Griffin API

Explore with Jentic

View OpenAPI Document

Griffin is a UK banking-as-a-service provider, and the Griffin API is the resource-oriented REST surface that exposes its banking operations. Agents can open and close bank accounts, manage legal persons (KYC subjects), submit and track payments, query transactions, look up Companies House data, run Admissions and Submissions for onboarding, and manage API keys. The API is structured as a tree under your organization with navigation links in every response and uses an Authorization header containing a Griffin-issued API key.

Use Cases

Patterns agents use The Griffin API for, with concrete tasks.

★ Embedded Banking Onboarding

Run a customer through KYC and then provision a Griffin bank account. The agent submits an admission, polls /v0/admissions/{admission-id} until the decision lands, then opens a bank account scoped to the approved legal person. Griffin's tree-shaped API exposes the navigation links inline, so agents can follow them without hard-coding paths.

Submit an admission for the customer, poll GET /v0/admissions/{admission-id} until decided, then open the bank account through the navigation link returned in the admission response.

Payment Initiation and Reconciliation

Initiate a UK payment from a Griffin bank account and reconcile it against the inbound transaction record. The agent calls POST /v0/bank/accounts/{bank-account-id}/payments to submit, GET /v0/bank/accounts/{bank-account-id}/payments to list, and GET /v0/bank/transactions/{transaction-id} to confirm settlement. This avoids stitching together separate payment and ledger tools.

Call POST /v0/bank/accounts/{bank-account-id}/payments with the payee details and amount, then poll the payment record until status reaches 'settled' and link the matching transaction.

Companies House Data Enrichment

Enrich a customer profile with UK Companies House data without bolting on a separate provider. GET /v0/companies-house/companies/{company-number} returns the company record direct from Griffin's enrichment proxy, useful during business account onboarding.

Given a company number from a signup form, call GET /v0/companies-house/companies/{company-number} and attach the registered address and officers to the case file.

AI Agent Treasury Assistant

An internal treasury agent uses Griffin to action payments approved by humans. The user says 'pay supplier X £4,500 from the operating account' and the agent searches Jentic for the right Griffin operation, loads the schema, executes the call against the correct account, and reports the payment ID back.

Search Jentic for 'submit a payment from a Griffin bank account', load the POST /v0/bank/accounts/{bank-account-id}/payments schema, execute it with the named account ID and payee details, and return the payment ID.

Key Endpoints

69 endpoints — griffin is a uk banking-as-a-service provider, and the griffin api is the resource-oriented rest surface that exposes its banking operations.

METHOD

PATH

DESCRIPTION

GET

/v0/index

Bootstrap the API tree with the organisation URL

GET

/v0/bank/accounts/{bank-account-id}

Get a bank account

POST

/v0/bank/accounts/{bank-account-id}/actions/close

Close a bank account

POST

/v0/bank/accounts/{bank-account-id}/payments

Submit a payment

GET

/v0/bank/accounts/{bank-account-id}/transactions

List transactions on an account

GET

/v0/bank/transactions/{transaction-id}

Get a single transaction

GET

/v0/admissions/{admission-id}

Get KYC admission status

GET

/v0/companies-house/companies/{company-number}

UK Companies House lookup

GET

/v0/index

Bootstrap the API tree with the organisation URL

GET

/v0/bank/accounts/{bank-account-id}

Get a bank account

POST

/v0/bank/accounts/{bank-account-id}/actions/close

Close a bank account

POST

/v0/bank/accounts/{bank-account-id}/payments

Submit a payment

GET

/v0/bank/accounts/{bank-account-id}/transactions

List transactions on an account

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

The Griffin API key is stored encrypted in the Jentic MAXsystem vault. The executor injects the full 'GriffinAPIKey ...' Authorization header at call time, so the raw key never enters the agent's context window or logs.

Intent-based discovery

Agents search by intent — 'submit a payment', 'open a bank account', 'look up a UK company' — and Jentic returns the matching Griffin operation with the parameter schema, so the agent calls the right endpoint without traversing the API tree manually.

Time to first call

Direct integration: 3-5 days to wire auth, navigation, KYC polling, and payment status flows. Through Jentic: minutes — search, load schema, execute.

FAQs

Specific to using The Griffin API through Jentic.

What authentication does The Griffin API use?

Griffin uses an API key in the Authorization header with the format 'GriffinAPIKey g-test-MyKey-XXXXXXX'. Through Jentic, the key is stored encrypted in the MAXsystem vault and the executor injects the full Authorization header at call time.

Can I open and close UK bank accounts with this API?

Yes. Bank accounts live under the organisation tree at /v0/bank/accounts/{bank-account-id}. Closure is a dedicated action — POST /v0/bank/accounts/{bank-account-id}/actions/close — rather than a status PATCH, in line with Griffin's design choice to gate sensitive transitions behind explicit endpoints.

What are the rate limits for the Griffin API?

The OpenAPI spec does not publish explicit rate limits. Griffin applies tenant-level throttles based on the API key's plan. Production agents should handle 429 responses with exponential backoff and surface failures to the workflow.

How do I submit a payment through Jentic?

Search Jentic for 'submit a payment from a bank account', load the POST /v0/bank/accounts/{bank-account-id}/payments schema, then execute it with the bank account ID, payee, and amount. The Authorization header is injected from the vault.

Does the API support pagination on list endpoints?

Yes. List responses include a links object with prev and next URLs. Page size is controlled with the page[size] query parameter (1-200, default 25). Agents follow the next link to walk through the full result set.

How do I test the Griffin API safely?

Anyone can register at app.griffin.com/register and try the API in sandbox mode with a test API key (prefix g-test-). The same endpoints apply — the only difference is the key and that no real funds move.

The Griffin API

Connect the The Griffin API to your agent

Capabilities

Start building with The Griffin API

Use Cases

Key Endpoints

Why Jentic?

Related APIs

FAQs