Anvil

Anvil is a PDF infrastructure platform providing REST and GraphQL APIs for filling PDF templates with JSON data, generating PDFs from HTML or Markdown, collecting e-signatures (Etch), building web forms, and extracting data from documents via OCR and Document AI. Designed for developers embedding paperwork automation into applications across HR, insurance, financial services, and legal workflows.

Anvil publishes 2 APIs on the APIs.io network: Fill API and Generate Pdf API. Tagged areas include PDF, PDF Filling, PDF Generation, E-Signatures, and Document Automation.

The Anvil catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Anvil’s developer surface includes authentication, documentation, getting-started guide, engineering blog, pricing, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub

49.0/100 developing ▬ flat Agent 33/100 agent ready saas Full breakdown ↓
scored 2026-09-10 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

2 APIs

PDFPDF FillingPDF Generation E-Signatures Document Automation OCR Document AI GraphQL REST Workflows Web FormsPaperwork Automation

Kin Score

Kin Score How this is scored →
scored 2026-09-10 · rubric v0.20.0

Composite quality — 49.0/100 · developing

Contract Quality 15.5 / 23

Developer Ergonomics 6.9 / 18

Access Clarity 9.0 / 18

Operational Transparency 6.2 / 12

Contract Governance 1.1 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 33/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

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 github.com/api-evangelist/anvil: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

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

Anvil Etch E-Sign API

Embed white-labeled e-signature collection into applications. Create e-sign packets, route documents to multiple signers, and receive webhook notifications on completion. Suppor...

Anvil GraphQL API

The primary query and mutation interface for Anvil. Covers e-sign packets, workflows, PDF operations, webforms, and document AI. The complete schema is downloadable via GET http...

Anvil Document AI & OCR API

Extract structured data from uploaded PDF documents using AI-powered OCR, automatic field detection, box finding, and schema mapping. Accelerates workflow building by inferring ...

Anvil Webhooks

Event-driven notifications for Anvil workflow events. Receive HTTP POST callbacks when e-sign packets are completed, web forms are submitted, workflow steps are finished, and mo...

Anvil Fill API

The Fill API from Anvil — 1 operation(s) for fill.

Anvil Generate Pdf API

The Generate Pdf API from Anvil — 1 operation(s) for generate pdf.

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Anvil PDF Filling Fill API

OPEN COLLECTION

Anvil PDF Filling Fill Generate Pdf API

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Anvil GraphQL API

The Anvil GraphQL API is the primary query and mutation interface for the Anvil platform. It exposes the full range of Anvil's document automation capabilities, including e-sign...

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Anvil Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Anvil Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Anvil Finops

FINOPS

Semantic Vocabularies 1

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

Anvil Context

4 classes · 24 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Anvil API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 2

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

Anvil Fill PDF Request

9 properties

JSON SCHEMA

Anvil Generate PDF Request

9 properties

JSON SCHEMA

Examples 2

Example request and response payloads for these APIs.

Anvil Fill Pdf Example

4 fields

EXAMPLE

Anvil Generate Pdf Html Example

4 fields

EXAMPLE

Security Posture 2

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

Anvil Authentication

http · 1 scheme

SECURITY

Anvil Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Anvil Agentic Access

2 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

GraphQLReference

GraphQLReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 6

SDKs, sample code, and the tooling you integrate with

GitHubOrg

Postman

SDKNodeJS

SDKPython

SDKCSharp

SDKReact

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 4

The organization behind the API

Website

Website

Blog

Blog

EngineeringBlog

EngineeringBlog

LinkedIn

Other 2

Properties that don't map to a standard resource type

OpenSource

OpenSource

Source (apis.yml)

aid: anvil
name: Anvil
description: Anvil is a PDF infrastructure platform providing REST and GraphQL APIs for filling PDF templates with JSON data,
  generating PDFs from HTML or Markdown, collecting e-signatures (Etch), building web forms, and extracting data from documents
  via OCR and Document AI. Designed for developers embedding paperwork automation into applications across HR, insurance,
  financial services, and legal workflows.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/anvil.png
url: https://raw.githubusercontent.com/api-evangelist/anvil/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- PDF
- PDF Filling
- PDF Generation
- E-Signatures
- Document Automation
- OCR
- Document AI
- GraphQL
- REST
- Workflows
- Web Forms
- Paperwork Automation
apis:
- aid: anvil:etch-esign-api
  name: Anvil Etch E-Sign API
  description: Embed white-labeled e-signature collection into applications. Create e-sign packets, route documents to multiple
    signers, and receive webhook notifications on completion. Supports interactive, progressive, and unordered signing flows
    (higher-tier plans).
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.useanvil.com/docs/api/e-signatures/
  baseURL: https://app.useanvil.com/graphql
  tags:
  - E-Signatures
  - GraphQL
  - Etch
  properties:
  - type: Documentation
    url: https://www.useanvil.com/docs/api/e-signatures/
  - type: GraphQLReference
    url: https://www.useanvil.com/docs/api/graphql/reference/
- aid: anvil:graphql-api
  name: Anvil GraphQL API
  description: The primary query and mutation interface for Anvil. Covers e-sign packets, workflows, PDF operations, webforms,
    and document AI. The complete schema is downloadable via GET https://app.useanvil.com/graphql/sdl.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.useanvil.com/docs/api/graphql/
  baseURL: https://app.useanvil.com/graphql
  tags:
  - GraphQL
  - E-Signatures
  - PDF
  - Workflows
  properties:
  - type: Documentation
    url: https://www.useanvil.com/docs/api/graphql/
  - type: GraphQLReference
    url: https://www.useanvil.com/docs/api/graphql/reference/
  - type: GraphQLSchema
    url: https://app.useanvil.com/graphql/sdl
- aid: anvil:document-ai-api
  name: Anvil Document AI & OCR API
  description: Extract structured data from uploaded PDF documents using AI-powered OCR, automatic field detection, box finding,
    and schema mapping. Accelerates workflow building by inferring field structure from existing documents.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.useanvil.com/docs/api/document-ai/
  baseURL: https://app.useanvil.com
  tags:
  - OCR
  - Document AI
  - Data Extraction
  - GraphQL
  properties:
  - type: Documentation
    url: https://www.useanvil.com/docs/api/document-ai/
- aid: anvil:webhooks
  name: Anvil Webhooks
  description: Event-driven notifications for Anvil workflow events. Receive HTTP POST callbacks when e-sign packets are completed,
    web forms are submitted, workflow steps are finished, and more. Configurable per organization.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.useanvil.com/docs/api/webhooks/
  baseURL: https://app.useanvil.com
  tags:
  - Webhook
  - Event
  - E-Signatures
  - Workflows
  tags_raw:
  - Webhooks
  - Events
  - E-Signatures
  - Workflows
  properties:
  - type: Documentation
    url: https://www.useanvil.com/docs/api/webhooks/
- aid: anvil:anvil-fill-api
  name: Anvil Fill API
  description: The Fill API from Anvil — 1 operation(s) for fill.
  humanURL: https://www.useanvil.com/products/pdf-filling-api/
  baseURL: https://app.useanvil.com
  tags:
  - Fill
  properties:
  - type: OpenAPI
    url: openapi/anvil-fill-api-openapi.yml
  - type: Documentation
    url: https://www.useanvil.com/docs/api/fill-pdf/
  - type: GraphQL
    url: graphql/anvil-graphql.md
  - type: Documentation
    url: https://www.useanvil.com/docs/api/generate-pdf/
- aid: anvil:anvil-generate-pdf-api
  name: Anvil Generate Pdf API
  description: The Generate Pdf API from Anvil — 1 operation(s) for generate pdf.
  humanURL: https://www.useanvil.com/products/pdf-filling-api/
  baseURL: https://app.useanvil.com
  tags:
  - Generate Pdf
  properties:
  - type: OpenAPI
    url: openapi/anvil-generate-pdf-api-openapi.yml
  - type: Documentation
    url: https://www.useanvil.com/docs/api/fill-pdf/
  - type: GraphQL
    url: graphql/anvil-graphql.md
  - type: Documentation
    url: https://www.useanvil.com/docs/api/generate-pdf/
common:
- type: AgenticAccess
  url: agentic-access/anvil-agentic-access.yml
- type: DomainSecurity
  url: security/anvil-domain-security.yml
- type: Authentication
  url: authentication/anvil-authentication.yml
- type: Website
  url: https://www.useanvil.com/
- type: Documentation
  url: https://www.useanvil.com/docs/
- type: GettingStarted
  url: https://www.useanvil.com/docs/api/getting-started/
- type: GitHubOrg
  url: https://github.com/anvilco
- type: Blog
  url: https://www.useanvil.com/blog/
- type: EngineeringBlog
  url: https://www.useanvil.com/blog/engineering/
- type: Pricing
  url: https://www.useanvil.com/pricing/
- type: StatusPage
  url: https://status.useanvil.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/anvil-foundry
- type: X
  url: https://x.com/useanvil
- type: OpenSource
  url: https://www.useanvil.com/open-source/
- type: Postman
  url: https://www.postman.com/anvilco
- type: SDKNodeJS
  url: https://github.com/anvilco/node-anvil
- type: SDKPython
  url: https://github.com/anvilco/python-anvil
- type: SDKCSharp
  url: https://github.com/anvilco/dotnet-anvil
- type: SDKReact
  url: https://github.com/anvilco/react-ui
- type: GraphQLReference
  url: https://www.useanvil.com/docs/api/graphql/reference/
- type: Plans
  url: plans/anvil-plans-pricing.yml
- type: RateLimits
  url: rate-limits/anvil-rate-limits.yml
- type: FinOps
  url: finops/anvil-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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