# PolySign

> PolySign, Inc. is a financial technology company building blockchain-enabled infrastructure for
> institutional digital asset capital markets and payments. It operates AtomicNet, a permissioned
> settlement network on which participants publish assets, orders, escrow and beneficiary
> authorizations, settlements and book transfers as signed records, and it was the parent of Standard
> Custody & Trust Company (acquired by Ripple in 2024). PolySign publishes three OpenAPI 3.0.3
> contracts — 78 operations in total — all secured with OAuth 2.0 client credentials.

This file was generated by API Evangelist from PolySign's published OpenAPI documents and live probes
on 2026-08-02. PolySign does not publish an llms.txt of its own.

## APIs

- [AtomicNet API Server](https://docs.polynet.sandbox.polysign.io/): 56-operation node interface for assets, partners, investors, orders, escrow and beneficiary authorizations, settlements, settlement confirmations, book transfers, status updates, data sync and system health.
- [AtomicNet Merchant Gate Node](https://docs.polynet.sandbox.polysign.io/merchant-gate.html): 8-operation merchant-facing gate — submit an order, submit a book transfer, register assets.
- [AtomicNet ABC Proxy Service](https://docs.polynet.sandbox.polysign.io/abc-service.html): 14-operation proxy for the ABC ledger — register accounts, memorialize and verify digests, sign and verify signatures, create and faucet testnet accounts.

## Specs

- [AtomicNet API Server OpenAPI 3.0.3](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/openapi/polysign-atomicnet-api-server-openapi.json)
- [AtomicNet Merchant Gate OpenAPI 3.0.3](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/openapi/polysign-merchant-gate-openapi.json)
- [AtomicNet ABC Proxy Service OpenAPI 3.0.3](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/openapi/polysign-abc-proxy-service-openapi.json)

## Authentication

- Token endpoint: `POST /v1/auth/token`, `application/x-www-form-urlencoded`, body `grant_type=client_credentials&scope=participant`, with an `authorization: Basic <base64 client_id:secret>` header.
- Single scope: `participant`. Applied globally to every operation in all three documents.
- Profile: [authentication](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/authentication/polysign-authentication.yml) · [scopes](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/scopes/polysign-scopes.yml)

## Conventions

- Base URL is **not published**: the specs carry no `servers[]` block and AtomicNet is participant-deployed. All paths are rooted at `/v1`.
- No `operationId` on any operation — address operations by method + path.
- Writes use `PUT` with a client-supplied record identifier; there is no `Idempotency-Key` contract.
- List operations take `status` / `role` filters only — no pagination.
- Correlation lives in the record body as `metadata.request_id`, not in an HTTP header.
- Every record is `{record, metadata, signature, schema_version}` with an ABC signature over the canonical record; `GET /v1/utils/canonicalize` reproduces that canonical form.
- Details: [conventions](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/conventions/polysign-conventions.yml) · [data model](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/data-model/polysign-data-model.yml) · [errors](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/errors/polysign-problem-types.yml) · [lifecycle](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/lifecycle/polysign-lifecycle.yml)

## Skills

- [Authenticate against an AtomicNet node](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/skills/polysign-authenticate-atomicnet.md)
- [Escrowed order to settlement](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/skills/polysign-escrowed-order-to-settlement.md)
- [Book transfer between investors](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/skills/polysign-book-transfer.md)
- [Memorialize and verify a digest on ABC](https://raw.githubusercontent.com/api-evangelist/polysign/refs/heads/main/skills/polysign-abc-memorialize-and-verify.md)

## Docs

- [Company site](https://www.polysign.io/)
- [Contact](https://www.polysign.io/contact.html) — hello@polysign.io
- [Legal notice](https://www.polysign.io/legal.html)
- [GitHub organization](https://github.com/PolySignInc)

## Not published

PolySign publishes no changelog, no status page, no deprecation policy, no pricing or sign-up page, no
terms of service or privacy policy, no security.txt or trust center, no client SDKs, no CLI, no
webhooks or AsyncAPI, no MCP server, and no A2A agent card. Every `/.well-known/` path probed on
www.polysign.io and docs.polynet.sandbox.polysign.io returned 404 on 2026-08-02.