Adfin

Adfin is a London-based fintech that combines payment collection and AI-powered credit control so businesses get paid faster. Its developer platform exposes invoicing, payments and credit-control APIs — create and activate invoices, issue payment requests with hosted payment pages, set up direct-debit mandates, and reconcile payments — plus signed webhooks for real-time invoice, mandate and payment events. Authentication is OAuth 2.0 (client-credentials for platforms, authorization-code for biller authorization), with an official Node.js SDK and a first-party MCP server for agent-driven invoicing. Adfin is a portfolio company of Index Ventures.

Adfin publishes 1 API on the APIs.io network. Tagged areas include Company, Fintech, Payments, Invoicing, and Credit Control.

The Adfin catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Adfin’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, changelog, pricing, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.7/100 thin Agent 39/100 agent aware Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyFintechPaymentsInvoicingCredit ControlDirect DebitBillingAccounts ReceivableUnited Kingdom

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 36.7/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 14.8 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 3.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 39/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/adfin: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

Adfin API

Invoicing, payments and credit-control API — customers, invoices, payment requests, direct-debit mandates, payments and signed webhooks.

MCP Servers

adfin-mcp.yml

MCP SERVER

Event Specifications

Adfin Webhooks

ASYNCAPI

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 Webhooks
Webhooks
 DataModel
DataModel
 Conformance
Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: adfin
name: Adfin
description: Adfin is a London-based fintech that combines payment collection and AI-powered credit control so businesses
  get paid faster. Its developer platform exposes invoicing, payments and credit-control APIs — create and activate invoices,
  issue payment requests with hosted payment pages, set up direct-debit mandates, and reconcile payments — plus signed webhooks
  for real-time invoice, mandate and payment events. Authentication is OAuth 2.0 (client-credentials for platforms, authorization-code
  for biller authorization), with an official Node.js SDK and a first-party MCP server for agent-driven invoicing. Adfin is
  a portfolio company of Index Ventures.
image: https://assets.adfin.com/frontend-resources/favicon/web-app-manifest-512x512.png
url: https://raw.githubusercontent.com/api-evangelist/adfin/refs/heads/main/apis.yml
x-type: company
x-source: index-ventures-portfolio
x-tier: profiled
x-tier-reason: enrichment-pipeline
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Fintech
- Payments
- Invoicing
- Credit Control
- Direct Debit
- Billing
- Accounts Receivable
- United Kingdom
apis:
- name: Adfin API
  description: Invoicing, payments and credit-control API — customers, invoices, payment requests, direct-debit mandates,
    payments and signed webhooks.
  humanURL: https://developer.adfin.com/docs/welcome
  baseURL: https://api.adfin.com
  properties:
  - type: Documentation
    url: https://developer.adfin.com/docs/welcome
  - type: APIReference
    url: https://developer.adfin.com/reference/welcome-1
  - type: GettingStarted
    url: https://developer.adfin.com/products/direct-integration/guides/get-started/1_get-access
  - type: Authentication
    url: authentication/adfin-authentication.yml
  - type: Webhooks
    url: asyncapi/adfin-webhooks.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://adfin.com
- type: DeveloperPortal
  url: https://developer.adfin.com/
- type: Documentation
  url: https://developer.adfin.com/docs/welcome
- type: APIReference
  url: https://developer.adfin.com/reference/welcome-1
- type: GettingStarted
  url: https://developer.adfin.com/products/direct-integration/guides/get-started/1_get-access
- type: Support
  url: https://support.adfin.com/en/
- type: Blog
  url: https://adfin.com/blog
- type: ChangeLog
  url: https://developer.adfin.com/changelog
- type: GitHubOrganization
  url: https://github.com/Adfin-Engineering
- type: Pricing
  url: https://adfin.com/pricing
- type: SignUp
  url: https://console.adfin.com/auth/signup
- type: Login
  url: https://console.adfin.com/auth/login
- type: TermsOfService
  url: https://adfin.com/terms-of-service
- type: PrivacyPolicy
  url: https://adfin.com/privacy-policy
- type: Authentication
  url: authentication/adfin-authentication.yml
- type: Conventions
  url: conventions/adfin-conventions.yml
- type: Idempotency
  url: conventions/adfin-conventions.yml
- type: Webhooks
  url: asyncapi/adfin-webhooks.yml
- type: Packages
  url: packages/adfin-packages.yml
- type: SDKs
  url: packages/adfin-packages.yml
- type: MCPServer
  url: mcp/adfin-mcp.yml
- type: LLMsTxt
  url: llms/adfin-llms.txt
- type: WellKnown
  url: well-known/adfin-well-known.yml
- type: Sandbox
  url: sandbox/adfin-sandbox.yml
- type: DataModel
  url: data-model/adfin-data-model.yml
- type: Conformance
  url: conformance/adfin-conformance.yml
- type: DomainSecurity
  url: security/adfin-domain-security.yml