Form3
Form3 is a United Kingdom-headquartered, cloud-native payments technology company offering account-to-account payment processing as a single, unified REST API to banks and fintechs. Founded in 2016 and headquartered in London, Form3 runs a fully managed, Payments-as-a-Service platform that connects customers to domestic and cross-border schemes - UK Faster Payments, Bacs and CHAPS, SEPA Credit Transfer, SEPA Instant and SEPA Direct Debit, and US instant rails - alongside Confirmation of Payee / Verification of Payee name-checking, direct debit mandate management, scheme-addressable account identification, event notifications (webhooks), and full audit trails. Its public API is REST built on the json:api specification, documented at api-docs.form3.tech with a downloadable Swagger 2.0 definition, and authenticated with OAuth2 client-credentials plus HTTP Message Signatures request signing and, in some environments, mutual TLS. Form3 is API-native and developer-facing but is a regulated B2B rail rather than an open self-serve signup product; production access is contracted.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Form3 the way a machine reads it — 15 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Form3 scores 61.3/100 (strong), with a separate agent-readiness read of 87/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Form3
Each block below is one kind of artifact we hold for Form3. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 7
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Form3 Public API
The unified Form3 Public API - a single REST API built on the json:api specification that connects banks and fintechs to domestic and cross-border payment schemes, covering paym...
Form3 Payments API
Send and receive account-to-account payments across supported schemes - UK Faster Payments, Bacs and CHAPS, SEPA Credit Transfer, SEPA Instant, and US instant rails - and handle...
Form3 Direct Debits & Mandates API
Originate and receive Bacs and SEPA direct debits, manage direct debit mandates, and process indemnity claims. Represented by the DirectDebits, DirectDebitsReads and Mandates op...
Form3 Account Identification & Verification API
Generate and manage scheme-addressable customer account numbers, validate UK sort code / account number combinations, and run Confirmation of Payee (UK) and Verification of Paye...
Form3 Files API
Submit and receive bulk payment instructions and scheme messages as files. Represented by the Transaction File API and Scheme File API operations under /files in the Form3 Publi...
Form3 Event Notifications API
Subscribe to and receive event notifications (webhooks) for payment and platform lifecycle events, and verify their signatures. Represented by the Subscriptions and notification...
Form3 Security & Access API
Manage users, roles, access-control entries and public keys under a flexible security and approval model, and read full audit trails and platform metrics. Represented by the Use...
Scroll within the panel for all 7 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
form3-mcp.yml
MCP SERVEREvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Form3 Notifications Webhooks
ASYNCAPISecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Form3 — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 7
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 7 ·
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 8
Authentication, authorization, and security posture
Scroll within the panel for all 8 ·
Operate 2
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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