openapi: 3.1.0 info: title: Helius API Catalog Addresses Sender API version: 1.0.0 summary: Machine-readable discovery document for every Helius API surface on Solana. description: 'This document is a discovery catalog — not an operational spec. It exists so AI agents, codegen tools, and SDK generators can locate the canonical OpenAPI document for every Helius API in one request instead of crawling the docs site. Start with the `x-apis` array: each entry links a Helius API surface to its canonical OpenAPI spec (`specUrl`) and human-readable docs (`docsUrl`). Follow `externalDocs` for the full developer documentation site. ## A note on JSON-RPC APIs Several Helius APIs (Solana RPC, DAS, Sender, Mint, Priority Fee, ZK Compression) follow the JSON-RPC 2.0 convention where every method POSTs to `/` with a `method` field in the request body. For each such API the repository ships both per-method fragment YAMLs (used to render the Mintlify reference pages) and an auto-generated `_combined.yaml` that merges every method into a single OpenAPI document. In the combined documents, colliding paths are disambiguated with a URL-fragment suffix (e.g. `/#getAccountInfo`) and each operation carries an `x-actual-path` extension that records the real request path (`/`). The fragment syntax is schema-only — real calls still go to the `url` in `servers`. All `specUrl` values below point to raw GitHub files on the `main` branch of `helius-labs/docs`. They are stable URLs suitable for downstream tools to pin or fetch. ' contact: name: Helius Support url: https://www.helius.dev/contact email: support@helius.dev license: name: Apache 2.0 url: https://www.apache.org/licenses/LICENSE-2.0.html servers: - url: https://mainnet.helius-rpc.com description: Solana mainnet RPC endpoint (Solana RPC, DAS, Priority Fee, ZK Compression) - url: https://devnet.helius-rpc.com description: Solana devnet RPC endpoint - url: https://sender.helius-rpc.com description: Helius Sender — global transaction submission - url: https://api.helius.xyz description: Helius REST APIs (Wallet API, Enhanced API, Webhooks) - url: https://admin-api.helius.xyz description: Helius Admin API — project usage and billing - url: https://api-mainnet.helius-rpc.com description: Mainnet RPC endpoint - url: https://api-devnet.helius-rpc.com description: Devnet RPC endpoint - url: http://slc-sender.helius-rpc.com description: Salt Lake City - url: http://ewr-sender.helius-rpc.com description: Newark - url: http://lon-sender.helius-rpc.com description: London - url: http://fra-sender.helius-rpc.com description: Frankfurt - url: http://ams-sender.helius-rpc.com description: Amsterdam - url: http://sg-sender.helius-rpc.com description: Singapore - url: http://tyo-sender.helius-rpc.com description: Tokyo tags: - name: Sender paths: /fast: post: tags: - Sender summary: sendTransaction operationId: senderApi_sendTransaction description: 'Submit transactions via Helius Sender for ultra-low latency transaction submission with dual routing to both Solana validators and Jito infrastructure. ' parameters: - name: api-key in: query required: false schema: type: string description: Standard users do not require an API key. Only users with custom TPS limits need to provide an API key. - name: swqos_only in: query required: false schema: type: boolean default: false description: When true, routes exclusively through SWQOS infrastructure, but has a lower minimal tip requirement. requestBody: required: true content: application/json: schema: type: object properties: jsonrpc: type: string enum: - '2.0' description: The JSON-RPC protocol version. example: '2.0' default: '2.0' id: type: string description: A unique identifier for the request. example: '1' default: '1' method: type: string enum: - sendTransaction description: The name of the RPC method to invoke. example: sendTransaction default: sendTransaction params: type: array description: Parameters for sending a transaction via Sender. items: oneOf: - type: string description: The transaction encoded in base64. - type: object description: Configuration options for transaction submission. required: - skipPreflight properties: encoding: type: string description: Data encoding format used for the Solana transaction payload. enum: - base58 - base64 example: base64 skipPreflight: type: boolean description: When true, bypasses Solana's preflight transaction validation for faster submission. Must be set to true for Sender. example: false maxRetries: type: integer description: Maximum number of automatic retry attempts. Should be set to 0. example: 0 example: jsonrpc: '2.0' id: '1' method: sendTransaction params: - Ab/WBgJxCprwWlK2fCxSwm9KrWlJQW8TdnYqXMvg5KropeLqHaa5yJeoWUb+LsGi6zlfs1Z/jA/RgJW++tBhPAKAAQACBGuePYZrXq9Jj+DwkquiMvsrNU5rlcAbmRfuAYui/CwAQr437DqfrFoSt1BSgM/2/0Iqja1QMefnu1hTYX96AA0DBkZv5SEXMv/srbpyw5vnvIzlu8X3EmssQ5s6QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAhWHa4WfUT12o+cyi2WGwfBvngyurXf5VQd4Ukn+5ZSIDAgAFAqCGAQACAAkDQA0DAAAAAAADAgABDAIAAABAQg8AAAAAAAA= - encoding: base64 skipPreflight: true maxRetries: 0 responses: '200': description: Transaction submitted successfully. Since we're skipping preflight checks, a 200 response does not guarantee that the transaction is valid or that it will land onchain. content: application/json: schema: type: object properties: jsonrpc: type: string enum: - '2.0' description: The JSON-RPC protocol version. example: '2.0' id: type: string description: Identifier matching the request. example: '1' result: type: string description: The transaction signature for tracking confirmation status. example: 4qTLpN1sBrp5SzZUKfrSH2897FmxA7AB4EbN4ccgSgEjG9RG2686pSKWhEbz65q4bvaRsdpKRJKZ3dkdGZA78u5s example: jsonrpc: '2.0' id: '1' result: 4qTLpN1sBrp5SzZUKfrSH2897FmxA7AB4EbN4ccgSgEjG9RG2686pSKWhEbz65q4bvaRsdpKRJKZ3dkdGZA78u5s '400': description: Bad Request - Missing tip, priority fee, or invalid submission parameters. content: application/json: schema: $ref: '#/components/schemas/SenderApi_ErrorResponse' example: jsonrpc: '2.0' error: code: -32602 message: Invalid request id: '1' '429': description: Too Many Requests - Rate limit exceeded. content: application/json: schema: $ref: '#/components/schemas/SenderApi_ErrorResponse' example: jsonrpc: '2.0' error: code: -32005 message: Too many requests id: '1' '500': description: Internal Server Error - An error occurred on the server. content: application/json: schema: $ref: '#/components/schemas/SenderApi_ErrorResponse' example: jsonrpc: '2.0' error: code: -32603 message: Internal error id: '1' '503': description: Service Unavailable - The service is temporarily unavailable. content: application/json: schema: $ref: '#/components/schemas/SenderApi_ErrorResponse' example: jsonrpc: '2.0' error: code: -32002 message: Service unavailable id: '1' '504': description: Gateway Timeout - The request timed out. content: application/json: schema: $ref: '#/components/schemas/SenderApi_ErrorResponse' example: jsonrpc: '2.0' error: code: -32003 message: Gateway timeout id: '1' servers: - url: https://sender.helius-rpc.com description: Global HTTPS endpoint (for frontend applications) - url: http://slc-sender.helius-rpc.com description: Salt Lake City - url: http://ewr-sender.helius-rpc.com description: Newark - url: http://lon-sender.helius-rpc.com description: London - url: http://fra-sender.helius-rpc.com description: Frankfurt - url: http://ams-sender.helius-rpc.com description: Amsterdam - url: http://sg-sender.helius-rpc.com description: Singapore - url: http://tyo-sender.helius-rpc.com description: Tokyo /ping: get: tags: - Sender summary: ping operationId: senderApi_ping description: 'Ping request to Helius Sender to maintain a warm connection ' security: [] responses: '200': description: Connection is alive. content: text/plain: schema: type: string example: ok '503': description: Service Unavailable - The service is temporarily unavailable. content: text/plain: schema: type: string servers: - url: https://sender.helius-rpc.com description: Global HTTPS endpoint (for frontend applications) - url: http://slc-sender.helius-rpc.com description: Salt Lake City - url: http://ewr-sender.helius-rpc.com description: Newark - url: http://lon-sender.helius-rpc.com description: London - url: http://fra-sender.helius-rpc.com description: Frankfurt - url: http://ams-sender.helius-rpc.com description: Amsterdam - url: http://sg-sender.helius-rpc.com description: Singapore - url: http://tyo-sender.helius-rpc.com description: Tokyo components: schemas: SenderApi_ErrorResponse: type: object properties: jsonrpc: type: string description: The JSON-RPC protocol version. enum: - '2.0' example: '2.0' error: type: object properties: code: type: integer description: The error code. example: -32602 message: type: string description: The error message. data: type: object description: Additional data about the error. id: type: string description: Identifier matching the request. example: '1' securitySchemes: ApiKeyQuery: type: apiKey in: query name: api-key description: Your Helius API key. You can get one for free in the [dashboard](https://dashboard.helius.dev/api-keys). ApiKeyHeader: type: apiKey in: header name: X-Api-Key description: API key passed in request header externalDocs: description: Helius Documentation (canonical) url: https://www.helius.dev/docs x-apis: - id: rpc-http name: Solana RPC (HTTP) description: JSON-RPC 2.0 methods for Solana mainnet and devnet, plus Helius extensions such as `getTransactionsForAddress` with server-side filtering and token account helpers (`getTokenAccountsByOwnerV2`, `getProgramAccountsV2`). specUrl: https://www.helius.dev/openapi/rpc-http.json docsUrl: https://www.helius.dev/docs/rpc/overview tags: - rpc - json-rpc - solana - accounts - transactions status: stable x-specFragments: https://github.com/helius-labs/docs/tree/main/openapi/rpc-http - id: das-api name: Digital Asset Standard (DAS) API description: Unified NFT and token queries for Solana — regular NFTs, compressed NFTs, and fungible tokens — indexed for fast lookups by owner, creator, authority, collection, or search. specUrl: https://www.helius.dev/openapi/das-api.json docsUrl: https://www.helius.dev/docs/das-api tags: - nft - tokens - compressed-nft - digital-assets - json-rpc status: stable x-specFragments: https://github.com/helius-labs/docs/tree/main/openapi/das-api - id: sender-api name: Helius Sender description: Ultra-low-latency transaction submission with dual routing to validators and Jito infrastructure. Regional endpoints for Salt Lake City, Newark, London, Frankfurt, Amsterdam, Singapore, and Tokyo. specUrl: https://www.helius.dev/openapi/sender-api.json docsUrl: https://www.helius.dev/docs/sending-transactions/sender tags: - transactions - sender - low-latency - jito status: stable x-specFragments: https://github.com/helius-labs/docs/tree/main/openapi/sender-api - id: wallet-api name: Wallet API description: High-performance REST API for Solana wallet data — identity, balances, transaction history, transfers, and funding lineage. Returns pre-indexed results suitable for wallet and portfolio UIs. specUrl: https://www.helius.dev/openapi/wallet-api.json docsUrl: https://www.helius.dev/docs/wallet-api/overview tags: - wallet - portfolio - history - rest status: beta - id: priority-fee-api name: Priority Fee API description: Real-time priority fee recommendations across multiple priority levels, derived from recent network activity. Accepts either account keys or a serialized transaction. specUrl: https://www.helius.dev/openapi/priority-fee-api.json docsUrl: https://www.helius.dev/docs/priority-fee-api tags: - priority-fee - transactions - fees - json-rpc status: stable x-specFragments: https://github.com/helius-labs/docs/tree/main/openapi/priority-fee-api - id: zk-compression name: ZK Compression Indexer description: Indexer API for Solana state compression — compressed accounts, compressed token balances, Merkle proofs, and validity proofs. Enables up to 1000x lower storage costs relative to regular accounts. specUrl: https://www.helius.dev/openapi/zk-compression.json docsUrl: https://www.helius.dev/docs/zk-compression/introduction tags: - zk-compression - state-compression - accounts - proofs - json-rpc status: stable x-specFragments: https://github.com/helius-labs/docs/tree/main/openapi/zk-compression - id: admin-api name: Admin API description: Programmatic access to Helius project usage and billing data — credits consumed, credits remaining, prepaid balances, and subscription details for the current billing cycle. specUrl: https://www.helius.dev/openapi/admin-api.json docsUrl: https://www.helius.dev/docs/api-reference/admin tags: - admin - billing - usage - rest status: stable x-specFragments: https://github.com/helius-labs/docs/tree/main/openapi/admin-api - id: enhanced-api name: Enhanced API description: Decoded, human-readable transaction history, NFT events, and address activity on Solana. Returns typed, parsed data instead of raw instruction bytes. specUrl: https://www.helius.dev/openapi/enhanced-api.json docsUrl: https://www.helius.dev/docs/enhanced-transactions/overview tags: - enhanced - parsed-transactions - nft-events - history - rest status: stable - id: webhooks name: Helius Webhooks description: Real-time HTTP notifications for Solana on-chain events — configure account, transaction, or NFT event subscriptions and receive parsed payloads via HTTPS POST. specUrl: https://www.helius.dev/openapi/webhooks.json docsUrl: https://www.helius.dev/docs/webhooks tags: - webhooks - events - notifications - rest status: stable