PolySign

PolySign, Inc. is an Oakland / San Francisco / New York financial technology company building blockchain-enabled infrastructure for institutional digital asset capital markets and payments. Founded by Arthur Britto, David Schwartz and Jack McDonald, PolySign operates a third-generation permissioned blockchain and the AtomicNet settlement network, and was the parent of Standard Custody & Trust Company, the NYDFS-regulated digital asset custody, trading and settlement platform acquired by Ripple in 2024. PolySign publishes three OpenAPI 3.0.3 contracts for AtomicNet — the AtomicNet API Server (node interface for assets, orders, escrow and beneficiary authorizations, settlements, settlement confirmations, book transfers, partners and investors), the AtomicNet Merchant Gate Node, and the AtomicNet ABC Proxy Service (account registration, digest memorialization, signing and testnet faucet) — all authenticated with OAuth 2.0 client credentials issued by a PolySign-hosted token endpoint.

PolySign publishes 17 APIs on the APIs.io network, including ABC Accounts API, ABC Memorials API, ABC Signing API, and 14 more. Tagged areas include Digital Assets, Blockchain, institutional-custody, Settlement, and Escrow.

PolySign’s developer surface includes documentation, API reference, support, authentication, sandbox, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub
29.1/100 thin ▬ flat Agent 25/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0
17 APIs 1 MCP Servers
Digital AssetsBlockchaininstitutional-custodySettlementEscrowCapital MarketsPaymentsFintechDistributed Ledgeratomicnet

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0
Composite quality — 29.1/100 · thin
Contract Quality 8.8 / 21
Developer Ergonomics 7.2 / 17
Access Clarity 0.0 / 17
Operational Transparency 0.3 / 11
Contract Governance 1.7 / 10
Discoverability 5.5 / 9
Regulatory Posture 6.3 / 15
Agent readiness — 25/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 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 0 / 7
Typed Event Surface 0 / 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 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Surface 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Payments 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.
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/.
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/polysign: 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 17

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

PolySign ABC Accounts API

The ABC Accounts API from PolySign — 3 operation(s) for abc accounts.

PolySign ABC Memorials API

The ABC Memorials API from PolySign — 2 operation(s) for abc memorials.

PolySign ABC Signing API

The ABC Signing API from PolySign — 1 operation(s) for abc signing.

PolySign ABC Testnet API

The ABC Testnet API from PolySign — 2 operation(s) for abc testnet.

PolySign Asset API

The asset API from PolySign — 5 operation(s) for asset.

PolySign Authentication API

The authentication API from PolySign — 1 operation(s) for authentication.

PolySign beneficiary authorization API

The beneficiary authorization API from PolySign — 6 operation(s) for beneficiary authorization.

PolySign book transfer API

The book transfer API from PolySign — 5 operation(s) for book transfer.

PolySign book transfer confirmation API

The book transfer confirmation API from PolySign — 4 operation(s) for book transfer confirmation.

PolySign escrow authorization API

The escrow authorization API from PolySign — 6 operation(s) for escrow authorization.

PolySign Investor API

The investor API from PolySign — 2 operation(s) for investor.

PolySign Order API

The order API from PolySign — 5 operation(s) for order.

PolySign Partner API

The partner API from PolySign — 3 operation(s) for partner.

PolySign Settlement API

The settlement API from PolySign — 5 operation(s) for settlement.

PolySign settlement confirmation API

The settlement confirmation API from PolySign — 6 operation(s) for settlement confirmation.

PolySign System API

The system API from PolySign — 4 operation(s) for system.

PolySign Utility API

The utility API from PolySign — 5 operation(s) for utility.

Scroll for all 17

Open Collections 18

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

API Collection

OPEN COLLECTION

AtomicNet ABC Proxy Service ABC Accounts API

OPEN COLLECTION

AtomicNet ABC Proxy Service ABC Memorials API

OPEN COLLECTION

AtomicNet ABC Proxy Service ABC Signing API

OPEN COLLECTION

AtomicNet ABC Proxy Service ABC Testnet API

OPEN COLLECTION

Polysign Asset API

OPEN COLLECTION

Polysign Authentication API

OPEN COLLECTION

AtomicNet API Server beneficiary authorization API

OPEN COLLECTION

Polysign book transfer API

OPEN COLLECTION

AtomicNet API Server book transfer confirmation API

OPEN COLLECTION

AtomicNet API Server escrow authorization API

OPEN COLLECTION

AtomicNet API Server Investor API

OPEN COLLECTION

Polysign Order API

OPEN COLLECTION

AtomicNet API Server Partner API

OPEN COLLECTION

AtomicNet API Server Settlement API

OPEN COLLECTION

AtomicNet API Server settlement confirmation API

OPEN COLLECTION

Polysign System API

OPEN COLLECTION

AtomicNet API Server Utility API

OPEN COLLECTION

Scroll for all 18

MCP Servers 1

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

PolySign MCP Server

MCP SERVER

Security Posture 2

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

Polysign Authentication

oauth2 · 1 scheme

SECURITY

Polysign Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Polysign Scopes

1 scope · clientCredentials

1 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

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
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 DataModel
DataModel
 Conformance
Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages

Access & Security 3

Authentication, authorization, and security posture

Authentication
Authentication
 OAuthScopes
OAuthScopes
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 1

Pricing, plans, and the legal terms of use

LegalNotice
LegalNotice

Company 3

The organization behind the API

Website
Website
 Twitter
Twitter
 LinkedIn
LinkedIn

Other 2

Properties that don't map to a standard resource type

Overlay
Overlay
 SecondaryMarket
SecondaryMarket

Source (apis.yml)

apis.yml Raw ↑ 
aid: polysign
name: PolySign
description: PolySign, Inc. is an Oakland / San Francisco / New York financial technology company building blockchain-enabled
  infrastructure for institutional digital asset capital markets and payments. Founded by Arthur Britto, David Schwartz and
  Jack McDonald, PolySign operates a third-generation permissioned blockchain and the AtomicNet settlement network, and was
  the parent of Standard Custody & Trust Company, the NYDFS-regulated digital asset custody, trading and settlement platform
  acquired by Ripple in 2024. PolySign publishes three OpenAPI 3.0.3 contracts for AtomicNet — the AtomicNet API Server (node
  interface for assets, orders, escrow and beneficiary authorizations, settlements, settlement confirmations, book transfers,
  partners and investors), the AtomicNet Merchant Gate Node, and the AtomicNet ABC Proxy Service (account registration, digest
  memorialization, signing and testnet faucet) — all authenticated with OAuth 2.0 client credentials issued by a PolySign-hosted
  token endpoint.
image: https://www.polysign.io/images/logo.png
url: https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.23'
created: '2026-08-02'
modified: '2026-08-02'
tags:
- Digital Assets
- Blockchain
- institutional-custody
- Settlement
- Escrow
- Capital Markets
- Payments
- Fintech
- Distributed Ledger
- atomicnet
tags_raw:
- digital-assets
- blockchain
- institutional-custody
- settlement
- escrow
- capital-markets
- payments
- fintech
- distributed-ledger
- atomicnet
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: polysign:polysign-abc-accounts-api
  name: PolySign ABC Accounts API
  description: The ABC Accounts API from PolySign — 3 operation(s) for abc accounts.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - ABC Accounts
  properties:
  - type: OpenAPI
    url: openapi/polysign-abc-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-abc-memorials-api
  name: PolySign ABC Memorials API
  description: The ABC Memorials API from PolySign — 2 operation(s) for abc memorials.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - ABC Memorials
  properties:
  - type: OpenAPI
    url: openapi/polysign-abc-memorials-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-abc-signing-api
  name: PolySign ABC Signing API
  description: The ABC Signing API from PolySign — 1 operation(s) for abc signing.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - ABC Signing
  properties:
  - type: OpenAPI
    url: openapi/polysign-abc-signing-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-abc-testnet-api
  name: PolySign ABC Testnet API
  description: The ABC Testnet API from PolySign — 2 operation(s) for abc testnet.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - ABC Testnet
  properties:
  - type: OpenAPI
    url: openapi/polysign-abc-testnet-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-asset-api
  name: PolySign Asset API
  description: The asset API from PolySign — 5 operation(s) for asset.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Asset
  tags_raw:
  - asset
  properties:
  - type: OpenAPI
    url: openapi/polysign-asset-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-authentication-api
  name: PolySign Authentication API
  description: The authentication API from PolySign — 1 operation(s) for authentication.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Authentication
  tags_raw:
  - authentication
  properties:
  - type: OpenAPI
    url: openapi/polysign-authentication-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-beneficiary-authorization-api
  name: PolySign beneficiary authorization API
  description: The beneficiary authorization API from PolySign — 6 operation(s) for beneficiary authorization.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - beneficiary authorization
  properties:
  - type: OpenAPI
    url: openapi/polysign-beneficiary-authorization-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-book-transfer-api
  name: PolySign book transfer API
  description: The book transfer API from PolySign — 5 operation(s) for book transfer.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Book Transfer
  tags_raw:
  - book transfer
  properties:
  - type: OpenAPI
    url: openapi/polysign-book-transfer-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-book-transfer-confirmation-api
  name: PolySign book transfer confirmation API
  description: The book transfer confirmation API from PolySign — 4 operation(s) for book transfer confirmation.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - book transfer confirmation
  properties:
  - type: OpenAPI
    url: openapi/polysign-book-transfer-confirmation-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-escrow-authorization-api
  name: PolySign escrow authorization API
  description: The escrow authorization API from PolySign — 6 operation(s) for escrow authorization.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - escrow authorization
  properties:
  - type: OpenAPI
    url: openapi/polysign-escrow-authorization-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-investor-api
  name: PolySign Investor API
  description: The investor API from PolySign — 2 operation(s) for investor.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Investor
  tags_raw:
  - investor
  properties:
  - type: OpenAPI
    url: openapi/polysign-investor-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-order-api
  name: PolySign Order API
  description: The order API from PolySign — 5 operation(s) for order.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Order
  tags_raw:
  - order
  properties:
  - type: OpenAPI
    url: openapi/polysign-order-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-partner-api
  name: PolySign Partner API
  description: The partner API from PolySign — 3 operation(s) for partner.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Partner
  tags_raw:
  - partner
  properties:
  - type: OpenAPI
    url: openapi/polysign-partner-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-settlement-api
  name: PolySign Settlement API
  description: The settlement API from PolySign — 5 operation(s) for settlement.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Settlement
  tags_raw:
  - settlement
  properties:
  - type: OpenAPI
    url: openapi/polysign-settlement-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-settlement-confirmation-api
  name: PolySign settlement confirmation API
  description: The settlement confirmation API from PolySign — 6 operation(s) for settlement confirmation.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - settlement confirmation
  properties:
  - type: OpenAPI
    url: openapi/polysign-settlement-confirmation-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-system-api
  name: PolySign System API
  description: The system API from PolySign — 4 operation(s) for system.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - System
  tags_raw:
  - system
  properties:
  - type: OpenAPI
    url: openapi/polysign-system-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
- aid: polysign:polysign-utility-api
  name: PolySign Utility API
  description: The utility API from PolySign — 5 operation(s) for utility.
  humanURL: https://docs.polynet.sandbox.polysign.io/
  tags:
  - Utility
  tags_raw:
  - utility
  properties:
  - type: OpenAPI
    url: openapi/polysign-utility-api-openapi.yml
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/merchant-gate.html
  - type: Documentation
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
  - type: APIReference
    url: https://docs.polynet.sandbox.polysign.io/abc-service.html
common:
- type: MCPServer
  url: mcp/polysign-mcp.yml
- type: Overlay
  url: overlays/polysign-abc-proxy-service-overlay.yaml
- type: Website
  url: https://www.polysign.io/
- type: SecondaryMarket
  url: https://forgeglobal.com/polysign_stock/
- type: Documentation
  url: https://docs.polynet.sandbox.polysign.io/
- type: APIReference
  url: https://docs.polynet.sandbox.polysign.io/
- type: GitHubOrganization
  url: https://github.com/PolySignInc
- type: Support
  url: https://www.polysign.io/contact.html
- type: LegalNotice
  url: https://www.polysign.io/legal.html
- type: Twitter
  url: https://twitter.com/polysigninc
- type: LinkedIn
  url: https://www.linkedin.com/company/polysign
- type: Authentication
  url: authentication/polysign-authentication.yml
- type: OAuthScopes
  url: scopes/polysign-scopes.yml
- type: Conventions
  url: conventions/polysign-conventions.yml
- type: ErrorCatalog
  url: errors/polysign-problem-types.yml
- type: Lifecycle
  url: lifecycle/polysign-lifecycle.yml
- type: DataModel
  url: data-model/polysign-data-model.yml
- type: Conformance
  url: conformance/polysign-conformance.yml
- type: DomainSecurity
  url: security/polysign-domain-security.yml
- type: Packages
  url: packages/polysign-packages.yml
- type: LLMsTxt
  url: llms/polysign-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Sandbox
  url: sandbox/polysign-sandbox.yml
x-enrichment:
  date: '2026-08-02'
  status: enriched
  artifacts_added: 24
  pass: local-v1

Work with this as data

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

MCP server

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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/polysign"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/polysign/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/polysign/evidence"

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