# Cryptanio API documentation > Public server-side REST API. Contract v1; product release 1.0.0 62; documentation updated 2026-10-10. Read the relevant method before invoking it. Examples operate on live data; no public sandbox is offered. A documentation release does not establish deployment. ## Start and concepts - [English guide](https://cryptanio.com/docs.md): setup, permissions, guides, payment states, signed webhooks, pagination, errors and retry rules. - [Russian guide](https://cryptanio.com/ru/docs.md): the same content in Russian. - [OpenAPI](https://cryptanio.com/openapi.json): exact request and response schemas, security and operation identifiers. ## SDK Single-file server-side clients cover all 16 operations, with no automatic retries, pagination or redirects. See the guide's SDK section for installation, signatures and examples. Invoice creation requires a caller-supplied stable Idempotency-Key. SSE exposes raw closable bytes, not parsed events or automatic replay. - [SDK manifest](https://cryptanio.com/files/sdk/manifest.json): shared product release, API contract, requirements and SHA-256. - [Node.js](https://cryptanio.com/files/sdk/node/cryptanio.mjs): Node.js 18+. - [Python](https://cryptanio.com/files/sdk/python/cryptanio.py): Python 3.10+. - [PHP](https://cryptanio.com/files/sdk/php/Cryptanio.php): PHP 8.1+ / cURL. - [Go](https://cryptanio.com/files/sdk/go/cryptanio.go): Go 1.22+. - [Rust](https://cryptanio.com/files/sdk/rust/cryptanio.rs): Rust 2021 / reqwest 0.12 / serde_json 1. ## Method reference - [Cryptanio MCP](https://cryptanio.com/mcp/index.md): remote HTTP and local stdio setup, read-only default, optional writes and example conversations. [Russian guide](https://cryptanio.com/ru/mcp/index.md). - [MCP package manifest](https://cryptanio.com/files/mcp/manifest.json): downloadable runtime, shared product release and SHA-256. The package is not a remote endpoint or a customer sandbox; check the guide's deployment notice before connecting. - [POST /v1/watches](https://cryptanio.com/docs/reference/create-watch/index.md): Create a Monitoring watch. [Russian reference](https://cryptanio.com/ru/docs/reference/create-watch/index.md). - [GET /v1/watches](https://cryptanio.com/docs/reference/list-watches/index.md): List Monitoring watches. [Russian reference](https://cryptanio.com/ru/docs/reference/list-watches/index.md). - [GET /v1/watches/{id}](https://cryptanio.com/docs/reference/get-watch/index.md): Get a Monitoring watch. [Russian reference](https://cryptanio.com/ru/docs/reference/get-watch/index.md). - [DELETE /v1/watches/{id}](https://cryptanio.com/docs/reference/delete-watch/index.md): Delete a Monitoring watch. [Russian reference](https://cryptanio.com/ru/docs/reference/delete-watch/index.md). - [GET /v1/events](https://cryptanio.com/docs/reference/list-events/index.md): List events. [Russian reference](https://cryptanio.com/ru/docs/reference/list-events/index.md). - [GET /v1/payments](https://cryptanio.com/docs/reference/list-payments/index.md): List Payments events. [Russian reference](https://cryptanio.com/ru/docs/reference/list-payments/index.md). - [POST /v1/invoices](https://cryptanio.com/docs/reference/create-invoice/index.md): Create an invoice. [Russian reference](https://cryptanio.com/ru/docs/reference/create-invoice/index.md). - [GET /v1/invoices](https://cryptanio.com/docs/reference/list-invoices/index.md): List invoices. [Russian reference](https://cryptanio.com/ru/docs/reference/list-invoices/index.md). - [GET /v1/invoices/{id}](https://cryptanio.com/docs/reference/get-invoice/index.md): Get an invoice. [Russian reference](https://cryptanio.com/ru/docs/reference/get-invoice/index.md). - [POST /v1/invoices/{id}/cancel](https://cryptanio.com/docs/reference/cancel-invoice/index.md): Cancel an invoice. [Russian reference](https://cryptanio.com/ru/docs/reference/cancel-invoice/index.md). - [POST /v1/endpoints](https://cryptanio.com/docs/reference/create-endpoint/index.md): Create a webhook endpoint. [Russian reference](https://cryptanio.com/ru/docs/reference/create-endpoint/index.md). - [GET /v1/endpoints](https://cryptanio.com/docs/reference/list-endpoints/index.md): List webhook endpoints. [Russian reference](https://cryptanio.com/ru/docs/reference/list-endpoints/index.md). - [DELETE /v1/endpoints/{id}](https://cryptanio.com/docs/reference/delete-endpoint/index.md): Delete a webhook endpoint. [Russian reference](https://cryptanio.com/ru/docs/reference/delete-endpoint/index.md). - [GET /v1/stream](https://cryptanio.com/docs/reference/stream-events/index.md): Stream events. [Russian reference](https://cryptanio.com/ru/docs/reference/stream-events/index.md). - [GET /v1/health](https://cryptanio.com/docs/reference/get-health/index.md): Get API health. [Russian reference](https://cryptanio.com/ru/docs/reference/get-health/index.md). - [GET /v1/chains](https://cryptanio.com/docs/reference/list-chains/index.md): List networks. [Russian reference](https://cryptanio.com/ru/docs/reference/list-chains/index.md). ## Integration safety Use https://api.cryptanio.com/v1. Keep API keys on the caller's server, not in browser code or URLs. Use only the granted projects/scopes. IDs and monetary amounts are strings. Invoice retries reuse the original Idempotency-Key and request. Other write methods are not universally retry-safe. Verify webhook signatures against raw bytes, persistently deduplicate signed event_id, and never treat a pending or simulated event as a confirmed payment. ## Localized guides - [en](https://cryptanio.com/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [fr](https://cryptanio.com/fr/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [es](https://cryptanio.com/es/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [ru](https://cryptanio.com/ru/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [de](https://cryptanio.com/de/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [pt](https://cryptanio.com/pt/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [ko](https://cryptanio.com/ko/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [ja](https://cryptanio.com/ja/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English. - [zh](https://cryptanio.com/zh/docs.md): localized guide and method reference; code examples and the public OpenAPI contract remain English.