Fillo

Fillo is a forms-as-infrastructure product that lets coding agents and developers build structured forms into their own products without hand-building the backend. The service handles validation, file uploads, versioning, response storage, webhooks, and delivery, and exposes a Management API, SDKs, CLI, and embeddable form widgets so flows like support requests, beta access, product feedback, approvals, cancellations, and data export requests can be dropped into any application.

Fillo publishes 14 API contracts indexed on the APIs.io network, including Agents API, Credentials API, Deliveries API, and 11 more. Tagged areas include Forms, Form Builder, Developer Tools, Embeddable Widgets, and Webhook.

The Fillo catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

Fillo’s developer surface includes CLI, changelog, sandbox, authentication, documentation, API reference, getting-started guide, and 35 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

67.5/100 exemplar Agent 51/100 agent ready Heartbeat 61/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 5 Agent Skills

Forms Form Builder Developer ToolsEmbeddable WidgetsWebhook Validation File Uploads SDK CLI Management API

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 67.5/100 · exemplar

Contract Quality 16.5 / 21

Developer Ergonomics 10.8 / 17

Access Clarity 10.5 / 17

Operational Transparency 7.9 / 11

Contract Governance 3.6 / 10

Discoverability 5.5 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 51/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's Ask about this →
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter Ask about this →

2 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Governance scores 35.6 — up to +7.7 composite points Ask about this →
Access Clarity scores 61.7 — up to +7.7 composite points Ask about this →
Developer Ergonomics scores 63.7 — up to +7.3 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/fillo-so/apis.yml: open an issue on github.com/api-evangelist/fillo-so to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 5

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 14

Individual APIs this provider publishes, each with its own machine-readable definition.

Fillo Agents API

The Agents API from Fillo — 2 operation(s) for agents.

Fillo Credentials API

The Credentials API from Fillo — 4 operation(s) for credentials.

Fillo Deliveries API

The Deliveries API from Fillo — 3 operation(s) for deliveries.

Fillo Fillo Management API

The Fillo Management API API from Fillo — 1 operation(s) for fillo management api.

Fillo Forms API

The Forms API from Fillo — 6 operation(s) for forms.

Fillo Insights API

The Insights API from Fillo — 1 operation(s) for insights.

Fillo Integrations API

The Integrations API from Fillo — 8 operation(s) for integrations.

Fillo Members API

The Members API from Fillo — 4 operation(s) for members.

Fillo Respondents API

The Respondents API from Fillo — 3 operation(s) for respondents.

Fillo Responses API

The Responses API from Fillo — 6 operation(s) for responses.

Fillo Settings API

The Settings API from Fillo — 1 operation(s) for settings.

Fillo Storage API

The Storage API from Fillo — 2 operation(s) for storage.

Fillo Webhooks API

The Webhooks API from Fillo — 2 operation(s) for webhooks.

Fillo Workspace API

The Workspace API from Fillo — 5 operation(s) for workspace.

Scroll for all 14

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Fillo MCP server

Fillo's hosted Model Context Protocol server lets a coding agent sign in with OAuth 2.1 (S256 PKCE + Dynamic Client Registration), choose a workspace/project, and build, publish...

MCP SERVER

Agent Skills 5

Packaged agent skills for driving this provider's APIs from an AI assistant.

build-and-publish-form

AGENT SKILL

collect-and-export-responses

AGENT SKILL

configure-webhooks

AGENT SKILL

manage-integrations

AGENT SKILL

operate-workspace

AGENT SKILL

Fillo API pricing

Prices published by Fillo, read 2026-11-07 from fillo.so/pricing.

Plan	Price
Free	€0 or $0 per month
Everything – 5,000 responses (monthly)	€35 or $39 per month
Everything – 25,000 responses (monthly)	€89 or $99
Everything – 100,000 responses (monthly)	€229 or $249
Everything – 5,000 responses (yearly)	€350 or $390
Everything – 25,000 responses (yearly)	€890 or $990
Everything – 100,000 responses (yearly)	€2,290 or $2,490

Plan details, limits and sources →

Rate limits

Management API per key: Project API keys allow 120 requests per minute per key
Management API per workspace: an aggregate ceiling of 240 per minute across the workspace
Public response submissions per form per client IP: The response endpoint allows up to 30 submissions per form and client IP per minute

All 6 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Fillo Plans Pricing

7 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fillo Rate Limits

6 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Fillo So Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Fillo So Context

24 classes · 78 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Fillo API Rules

66 rules · 53 error-severity 12 warn-severity 1 info-severity

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Fillo Openapi Overlay

47 actions · update · fillo-so-openapi.json

GENERATED

JSON Schema 21

Standalone JSON Schema definitions for this provider's data models.

AgentGrant

8 properties

JSON SCHEMA

ConfirmTarget

1 properties

JSON SCHEMA

CredentialSummary

5 properties

JSON SCHEMA

DeliveryHealth

4 properties

JSON SCHEMA

DriveFolderListing

2 properties

JSON SCHEMA

DriveFolder

2 properties

JSON SCHEMA

FormDetail

9 properties

JSON SCHEMA

FormDrafts

4 properties

JSON SCHEMA

FormInsights

20 properties

JSON SCHEMA

FormSettingsEnvelope

1 properties

JSON SCHEMA

FormSettings

0 properties

JSON SCHEMA

FormStorage

3 properties

JSON SCHEMA

FormSummary

6 properties

JSON SCHEMA

FormVersion

4 properties

JSON SCHEMA

IntegrationConnections

3 properties

JSON SCHEMA

Respondent

8 properties

JSON SCHEMA

ResponseSummary

6 properties

JSON SCHEMA

WebhookAuthenticationInput

2 properties

JSON SCHEMA

WebhookCreated

5 properties

JSON SCHEMA

Webhook

5 properties

JSON SCHEMA

WorkspaceMembers

2 properties

JSON SCHEMA

Scroll for all 21

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fillo Authentication

http/oauth2 · 2 schemes

SECURITY

Fillo Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Fillo Scopes

17 scopes

SCOPES

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Fillo Agentic Access

65 operations · 37 acting · 6 human-in-the-loop

65 operations · 37 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

Sandbox

Sandbox

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 10

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

Components

Conventions

Lifecycle

ErrorCatalog

Conformance

Scroll for all 10

Build 6

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

CLI

ToolCrosswalk

SDKs

Packages

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

OAuthScopes

Authentication

DomainSecurity

Security

Operate 4

Status, limits, changes, and where to get help

RateLimits

ChangeLog

Deprecation

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

Hosts

Hosts

Source (apis.yml)

aid: fillo-so
name: Fillo
description: Fillo is a forms-as-infrastructure product that lets coding agents and developers build structured forms into
  their own products without hand-building the backend. The service handles validation, file uploads, versioning, response
  storage, webhooks, and delivery, and exposes a Management API, SDKs, CLI, and embeddable form widgets so flows like support
  requests, beta access, product feedback, approvals, cancellations, and data export requests can be dropped into any application.
url: https://artifacts.apis.io/fillo-so/apis.yml
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-13'
  method: derived
image: https://fillo.so/opengraph-image?48f2a051b4bb8a56
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-07 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-07'
modified: '2026-11-07'
tags:
- Forms
- Form Builder
- Developer Tools
- Embeddable Widgets
- Webhook
- Validation
- File Uploads
- SDK
- CLI
- Management API
tags_raw:
- Forms
- Form Builder
- Developer Tools
- Embeddable Widgets
- Webhooks
- Validation
- File Uploads
- SDK
- CLI
- Management API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: IntegrationEdges
  url: integrations/fillo-so-integration-edges.yml
- type: AgenticAccess
  url: agentic-access/fillo-so-agentic-access.yml
- type: RateLimits
  url: rate-limits/fillo-so-rate-limits.yml
- type: Plans
  url: plans/fillo-so-plans-pricing.yml
- type: Spectral
  url: rules/fillo-so-rules.yml
- type: JSONLD
  url: json-ld/fillo-so-context.jsonld
- type: Vocabulary
  url: vocabulary/fillo-so-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/fillo-so-webhooks.yml
- type: DataModel
  url: data-model/fillo-so-data-model.yml
- type: Components
  url: components/fillo-so-components.yml
- type: CLI
  url: cli/fillo-so-cli.yml
- type: ChangeLog
  url: changelog/fillo-so-changelog.yml
- type: Conventions
  url: conventions/fillo-so-conventions.yml
- type: Sandbox
  url: sandbox/fillo-so-sandbox.yml
- type: OAuthScopes
  url: scopes/fillo-so-scopes.yml
- type: Deprecation
  url: lifecycle/fillo-so-lifecycle.yml
- type: Lifecycle
  url: lifecycle/fillo-so-lifecycle.yml
- type: ErrorCatalog
  url: errors/fillo-so-problem-types.yml
- type: Conformance
  url: conformance/fillo-so-conformance.yml
- type: Overlay
  url: overlays/fillo-so-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/fillo-so-llms.txt
- type: ToolCrosswalk
  url: mcp/fillo-so-tool-crosswalk.yml
- type: MCPServer
  url: mcp/fillo-so-mcp.yml
- type: WellKnown
  url: well-known/fillo-so-well-known.yml
- type: Hosts
  url: hosts/fillo-so-hosts.yml
- type: SDKs
  url: packages/fillo-so-packages.yml
- type: Packages
  url: packages/fillo-so-packages.yml
- type: GitHubOrganization
  url: https://github.com/jacobfunch
- type: Authentication
  url: authentication/fillo-so-authentication.yml
- type: DomainSecurity
  url: security/fillo-so-domain-security.yml
- type: Website
  url: https://fillo.so/
- type: Documentation
  url: https://fillo.so/docs
- type: APIReference
  url: https://fillo.so/docs/reference
- type: GettingStarted
  url: https://fillo.so/docs
- type: ChangeLog
  url: https://fillo.so/changelog
- type: Pricing
  url: https://fillo.so/pricing
- type: SignUp
  url: https://fillo.so/signup
- type: Login
  url: https://fillo.so/login
- type: TermsOfService
  url: https://fillo.so/legal/terms
- type: PrivacyPolicy
  url: https://fillo.so/legal/privacy
- type: Security
  url: https://fillo.so/legal/security
apis:
- aid: fillo-so:fillo-so-agents-api
  name: Fillo Agents API
  description: The Agents API from Fillo — 2 operation(s) for agents.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-agents-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-agent-grant-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-confirm-target-schema.json
- aid: fillo-so:fillo-so-credentials-api
  name: Fillo Credentials API
  description: The Credentials API from Fillo — 4 operation(s) for credentials.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Credentials
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-credentials-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-credential-summary-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-confirm-target-schema.json
- aid: fillo-so:fillo-so-deliveries-api
  name: Fillo Deliveries API
  description: The Deliveries API from Fillo — 3 operation(s) for deliveries.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Deliveries
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-deliveries-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-delivery-health-schema.json
- aid: fillo-so:fillo-so-fillo-management-api-api
  name: Fillo Fillo Management API
  description: The Fillo Management API API from Fillo — 1 operation(s) for fillo management api.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Fillo Management API
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-fillo-management-api-api-openapi.yml
- aid: fillo-so:fillo-so-forms-api
  name: Fillo Forms API
  description: The Forms API from Fillo — 6 operation(s) for forms.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Forms
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-forms-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-form-detail-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-form-summary-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-form-version-schema.json
- aid: fillo-so:fillo-so-insights-api
  name: Fillo Insights API
  description: The Insights API from Fillo — 1 operation(s) for insights.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Insights
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-insights-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-form-insights-schema.json
- aid: fillo-so:fillo-so-integrations-api
  name: Fillo Integrations API
  description: The Integrations API from Fillo — 8 operation(s) for integrations.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Integration
  tags_raw:
  - Integrations
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-integrations-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-integration-connections-schema.json
- aid: fillo-so:fillo-so-members-api
  name: Fillo Members API
  description: The Members API from Fillo — 4 operation(s) for members.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Members
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-members-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-workspace-members-schema.json
- aid: fillo-so:fillo-so-respondents-api
  name: Fillo Respondents API
  description: The Respondents API from Fillo — 3 operation(s) for respondents.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Respondents
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-respondents-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-respondent-schema.json
- aid: fillo-so:fillo-so-responses-api
  name: Fillo Responses API
  description: The Responses API from Fillo — 6 operation(s) for responses.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Responses
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-responses-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-response-summary-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-form-drafts-schema.json
- aid: fillo-so:fillo-so-settings-api
  name: Fillo Settings API
  description: The Settings API from Fillo — 1 operation(s) for settings.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Settings
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-settings-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-form-settings-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-form-settings-envelope-schema.json
- aid: fillo-so:fillo-so-storage-api
  name: Fillo Storage API
  description: The Storage API from Fillo — 2 operation(s) for storage.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Storage
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-storage-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-form-storage-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-drive-folder-listing-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-drive-folder-schema.json
- aid: fillo-so:fillo-so-webhooks-api
  name: Fillo Webhooks API
  description: The Webhooks API from Fillo — 2 operation(s) for webhooks.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-webhook-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-webhook-created-schema.json
  - type: JSONSchema
    url: json-schema/fillo-so-webhook-authentication-input-schema.json
- aid: fillo-so:fillo-so-workspace-api
  name: Fillo Workspace API
  description: The Workspace API from Fillo — 5 operation(s) for workspace.
  humanURL: https://fillo.so/docs/api
  baseURL: https://fillo.so
  tags:
  - Workspace
  properties:
  - type: OpenAPI
    url: openapi/fillo-so-workspace-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fillo-so-confirm-target-schema.json
x-enrichment:
  date: '2026-11-07'
  status: enriched
  artifacts_added: 49
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Fillo API — frequently asked questions

Does Fillo have an API?

Yes. APIs.io lists 14 APIs from Fillo, including Fillo Agents API, Fillo Credentials API and Fillo Deliveries API, and 11 more.

Is there an OpenAPI specification for the Fillo API?

Yes. APIs.io indexes 14 OpenAPI specifications for Fillo, each linked for download from this page.

How do I authenticate with the Fillo API?

Fillo documents its authentication (http/oauth2 · 2 schemes). The details are profiled on APIs.io as Fillo Authentication.

How much does the Fillo API cost?

Fillo publishes its prices; its Free plan is €0 or $0 per month as of 2026-11-07. APIs.io lists 7 pricing plans for Fillo, with each plan's price, limits and inclusions under Pricing on this page.

Does Fillo have an MCP server?

Yes. APIs.io lists 1 MCP server for Fillo: Fillo's hosted Model Context Protocol server lets a coding agent sign in with OAuth 2.1 (S256 PKCE + Dynamic Client Registration), choose a workspace/project, and build, publish, and operate forms aga

Is the Fillo API ready for AI agents?

Fillo has a Kin Score of 67.5 out of 100 (exemplar) and an Agent Readiness score of 51.1 (agent-ready), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/fillo-so"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/fillo-so/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/fillo-so/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

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A second provider on the same verified email joins the account you already have.