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APIs / Finance / Clientary API
Clientary API logo

Clientary API

67
AI ReadinessAI-Aware (B+)67/100
See full scorecard
Agent-ready OpenAPI document · curated by JenticFinanceAccountingapiKey32 EndpointsREST

Know of an official OpenAPI document? Contribute it →

For Agents

Run a freelancer or agency back office: create invoices and estimates, log time and expenses, record payments, and manage clients and projects.

Use for: I need to create an invoice for a client, Send an estimate and convert it once approved, Log time entries against an active project, Record a payment received against an invoice

Not supported: Does not handle payment processing, payroll, or full general-ledger accounting - use for freelancer and agency invoicing, time, and expense tracking only.

Jentic publishes the only available OpenAPI specification for Clientary API, keeping it validated and agent-ready. Clientary is a business-management platform for freelancers and agencies, exposing endpoints for clients, invoices, estimates, projects, time entries, expenses, payments, and staff. Authentication uses an API key sent in the Authorization header. The API is designed for back-office automation: turning logged hours into invoices, reconciling payments, and keeping client records in sync with external CRMs.

Jentic One on GithubView OpenAPI Document

Install Jentic One Beta

Connect the Clientary API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Clientary 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.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

1

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fclientary.com%2Fclientary" | sh
2

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fclientary.com%2Fclientary" | 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 Clientary API.

Create and send invoices to clients with line items and tax

Generate estimates and convert accepted ones into invoices

Log billable time entries against projects and staff

Record client payments and reconcile them to invoices

Track project-level expenses for reimbursement and reporting

Maintain a synced client directory across Clientary and an external CRM

Use Cases

Patterns agents use Clientary API for, with concrete tasks.

★ Time-to-Invoice Automation

Agencies that bill hourly can let an agent read approved time entries from /time-entries, group them by client and project, and create draft invoices via POST /invoices at the end of each billing period. Tax, hourly rate, and project mapping are pulled from the existing Clientary records, so the agent does not need to model pricing logic. Month-end billing that previously took a bookkeeper a full day finishes in minutes.

List time entries from the last 30 days for client id 42, group by project, and POST a single consolidated invoice with one line per project at the project's hourly rate.

Estimate-to-Invoice Workflow

Sales-led agencies can have an agent create an estimate via POST /estimates when a deal is won in their CRM, send it for client approval, and convert it into an invoice on acceptance. Because Clientary keeps both estimates and invoices keyed to the same client and project, the agent only needs to copy line items and update the document type. This shortens the gap between deal close and first invoice from days to under an hour.

Create an estimate for client id 17 with three line items totalling $4,500, then once status is 'accepted' POST a matching invoice and link it back to the original estimate.

Payment Reconciliation

Finance teams can reconcile bank deposits to outstanding invoices by having an agent list /invoices with status=open, match each amount to incoming payments fed from the bank, and POST records to /payments with the correct invoice id. Disputed or partial matches are flagged for review. This removes the manual spreadsheet step that typically follows weekly bank statement downloads.

List open invoices for the last 60 days, for each $1,200 deposit on the bank feed find the matching invoice by client and amount, and POST a payment record against that invoice.

Expense and Project Profitability

Project managers can track gross margin per project by combining time entries, expenses, and invoices. An agent calls /projects, /time-entries, /expenses, and /invoices, joins on project id, and produces a margin report. Because all four resources live in the same API, the report can run on demand rather than as an end-of-quarter exercise.

For project id 'website-redesign' fetch all time entries, expenses, and invoiced amounts year-to-date, then return the gross margin as billed minus expenses minus (hours × cost rate).

AI Agent Back-Office Assistant via Jentic

Solo founders and small agencies can register Clientary through Jentic and ask an AI assistant to handle invoicing, payments, and client updates conversationally. Jentic stores the API key server-side and exposes Clientary operations as searchable tools, so the assistant can act on an instruction like 'invoice Acme for last month' without seeing the credential. Setup time is a single Jentic search-load-execute call instead of a custom integration.

Search Jentic for 'create an invoice in clientary', load the POST /invoices schema, and execute with client_id 42 and three line items provided by the user.

Key Endpoints

32 endpoints — jentic publishes the only available openapi specification for clientary api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

POST

/invoices

Create an invoice

GET

/invoices

List invoices

POST

/estimates

Create an estimate

POST

/clients

Create a client

GET

/clients/{id}

Get a single client

PUT

/invoices/{id}

Update an invoice

POST

/invoices

Create an invoice

GET

/invoices

List invoices

POST

/estimates

Create an estimate

POST

/clients

Create a client

GET

/clients/{id}

Get a single client

PUT

/invoices/{id}

Update an invoice

Jentic AI Readiness Score

This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.

C

Clientary API

- AI-Aware (B+)
67/100
99
Foundational Compliance
63
Developer Experience & Jentic Compatibility
49
AI-Readiness & Agent Experience
94
Agent Usability
50
Security
100
AI Discoverability
Powered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.0
Show dimension breakdown
99

Foundational Compliance

Base layer of spec validity and structural soundness.

Grade: A+Signals: 4
97%

Lint Results

Aggregated quality score from linter diagnostics, weighted by severity.

100%

Resolution Completeness

Percentage of `$ref` references that resolve successfully.

100%

Specification Validity

Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).

100%

Structural Integrity

Structural correctness score based on schema issues using logarithmic dampening.

63

Developer Experience & Jentic Compatibility

Clarity, completeness, and ingestion readiness for developers and tooling.

Grade: B-Signals: 4
0%

Example Density

How richly the API is illustrated with examples.

100%

Example Validity

Percentage of examples that conform to their schemas.

50%

Response Coverage

Percentage of operations with complete response definitions (success, client error, server error).

100%

Tooling Readiness

Health of API ingestion, bundling, and resolution within Jentic pipelines.

49

AI-Readiness & Agent Experience

Semantic breadth, depth, and agent comprehension for AI systems.

Grade: D+Signals: 4
28%

Description Coverage

Coverage of descriptions across API elements.

0%

Error Standardization

Coverage of RFC 9457 Problem Details for error responses.

100%

OperationId Quality

Coverage, uniqueness, and casing consistency of operationIds for AI inference.

70%

Summary Coverage

Coverage of summaries across operations/tags/info.

94

Agent Usability

Functional utility, complexity comfort, and AI orchestration readiness.

Grade: A+Signals: 1
94%

Complexity Comfort

Agent comfort level based on API operational and structural complexity.

50

Security

Trust, risk posture, and security compliance.

Grade: C-Signals: 1
50%

Authentication Strength

Average quality of security schemes based on authentication method strength (weakest link for OAuth2).

100

AI Discoverability

Findability, semantic richness, and reasoning readiness.

Grade: A+Signals: 1
100%

Descriptive Richness

Clarity and depth of descriptions across API elements.

View full reportHow the score is calculatedMore about the dimensions

Score it yourself

Every API in the directory is allowlisted, so you can re-score it with no key required.

Score your own APIScoring CLI agent skill
npx @jentic/api-scorecard-cli score <openapi-url>

Why Jentic?

What agents get from Jentic-routed access to this vendor.

Setup

Wiring the Clientary API by hand means setting the Authorization API key header on every call to www.clientary.com/api/v2 and mapping the right operation across invoices, estimates, and clients yourself. Through Jentic you install once, import the Clientary API from the API Directory, store the API key once, and your agent calls it.

Permission scoping

Clientary puts resource ids in the URL path (/invoices/{id}, /clients/{id}), so a rule can pin your agent to a specific invoice or client. You choose the operations it may call, so invoice updates are not included unless you add them.

Credential isolation

Your Clientary API key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'create an invoice in Clientary' or 'list unpaid invoices', and Jentic returns the matching Clientary operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Xero Accounting API

→

Full general-ledger accounting platform with invoicing and payments.

Choose Xero when full accounting (chart of accounts, bank feeds, payroll integration) is needed; choose Clientary for lightweight freelancer and agency billing.

Complementary

Stripe API

Payment processing for cards, wallets, and bank debits.

Pair Stripe with Clientary so an agent can take card payment for a Clientary invoice and then POST the matching /payments record.

Alternative

PayPal Invoicing API

→

PayPal's standalone invoicing service.

Use PayPal Invoicing when the buyer flow must finish inside PayPal; use Clientary for the broader project, time, and expense context.

FAQs

Specific to using Clientary API through Jentic.

Why is there no official OpenAPI spec for Clientary API?

Clientary does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Clientary API via structured tooling. It is validated against the live API and kept up to date. Get started with Jentic One, the self-hosted execution layer.

What authentication does the Clientary API use?

The API uses an API key in the Authorization header. Through Jentic, the key is stored encrypted in the vault and never enters the agent's context - the agent gets a scoped execution token instead.

Can I create invoices and estimates with the Clientary API?

Yes. POST /invoices creates an invoice and POST /estimates creates an estimate. Both accept line items, client id, and tax fields, so an agent can convert an accepted estimate into an invoice by reusing the same line-item payload.

How do I record a payment against an invoice with the Clientary API?

POST /payments with the invoice id, amount, and date. The endpoint links the payment to the invoice and updates its status. Through Jentic, search for 'record a payment in clientary' to load the schema and execute.

What are the rate limits for the Clientary API?

Clientary does not publish hard rate limits in the spec. Build clients to handle 429 responses with exponential backoff and check current limits with Clientary support for your account tier.

How do I generate an invoice from time entries through Jentic?

Run pip install jentic, then chain three calls: list /time-entries filtered by project and date, group by project, and POST /invoices with one line per project. Jentic returns each operation's input schema so the agent can build payloads without manual reference to docs.

Can I limit what my agent is allowed to do with the Clientary API?

Yes. Because you run Jentic One yourself, your own rules decide which Clientary operations and credentials the agent may use. You can allow read-only calls like GET /invoices and GET /clients/{id} while withholding write operations such as POST /invoices or PUT /invoices/{id}, so the agent never creates or edits records unless you add those operations. Since Clientary keeps resource ids in the URL path (/invoices/{id}, /clients/{id}), a rule can also pin the agent to a specific invoice or client.

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View OpenAPI Document