IOTA Transaction Builder API

Build unsigned transactions for transfers, staking, Move calls (unsafe_ prefix)

Operations 15

POST /unsafe_batchTransaction unsafe_batchTransaction #
POST /unsafe_mergeCoins unsafe_mergeCoins #
POST /unsafe_moveCall unsafe_moveCall #
POST /unsafe_pay unsafe_pay #
POST /unsafe_payAllIota unsafe_payAllIota #
POST /unsafe_payIota unsafe_payIota #
POST /unsafe_publish unsafe_publish #
POST /unsafe_requestAddStake unsafe_requestAddStake #
POST /unsafe_requestAddTimelockedStake unsafe_requestAddTimelockedStake #
POST /unsafe_requestWithdrawStake unsafe_requestWithdrawStake #
POST /unsafe_requestWithdrawTimelockedStake unsafe_requestWithdrawTimelockedStake #
POST /unsafe_splitCoin unsafe_splitCoin #
POST /unsafe_splitCoinEqual unsafe_splitCoinEqual #
POST /unsafe_transferIota unsafe_transferIota #
POST /unsafe_transferObject unsafe_transferObject #

Work with this as data

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

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • 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 API
curl "https://apis.io/api/v1/apis/iota:iota-transaction-builder-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

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

OpenAPI Specification

iota-transaction-builder-api-openapi.yml Raw ↑
openapi: 3.2.0
info:
  title: IOTA JSON-RPC Transaction Builder API
  description: IOTA JSON-RPC API for interaction with IOTA full node or indexer. All requests are HTTP POST to the node endpoint. Covers iota_ (Read, Write, Move Utils), iotax_ (Extended, Coin Query, Governance), and unsafe_ (Transaction Builder) method namespaces.
  version: 1.26.0-alpha
  contact:
    name: IOTA Foundation
    email: info@iota.org
    url: https://docs.iota.org/
  license:
    name: Apache-2.0
    url: https://opensource.org/licenses/Apache-2.0
  x-openrpc-source: https://raw.githubusercontent.com/iotaledger/iota/develop/crates/iota-open-rpc/spec/openrpc.json
servers:
- url: https://api.mainnet.iota.cafe
  description: IOTA Mainnet full node
- url: https://api.testnet.iota.cafe
  description: IOTA Testnet full node
- url: https://api.devnet.iota.cafe
  description: IOTA Devnet full node
- url: https://indexer.mainnet.iota.cafe
  description: IOTA Mainnet indexer (iotax_ methods)
- url: https://indexer.testnet.iota.cafe
  description: IOTA Testnet indexer (iotax_ methods)
tags:


# --- truncated at 32 KB (37 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/iota/refs/heads/main/openapi/iota-transaction-builder-api-openapi.yml