Build unsigned EVM transactions ready for signing. Returns the raw unsigned transaction hex and fee details. After preparing, use a signing tool (e.g. evm_sign) to sign locally, then broadcast via broadcast_signed_transaction.

Actions: • prepare-transaction-from-address: Build an unsigned native coin transfer (e.g. ETH, BNB) • prepare-fungible-token-transfer: Build an unsigned ERC-20 token transfer • prepare-nft-transfer: Build an unsigned ERC-721 NFT transfer

Credits by action (source: OpenAPI): • prepare-fungible-token-transfer: 24 • prepare-nft-transfer: 24 • prepare-transaction-from-address: 24

Credits are indicative only and may change at any time. The actual credits spent for each API request are returned in the response headers.

CryptoAPIs reference documentation — no API call, no credits consumed.

Actions: • blockchains — Supported blockchains, networks, products per chain, denominations, fiat currencies • errors — Complete error code table (HTTP status, error code, message) • credits — Credit charging structure, cost multipliers per blockchain, monitoring & operations taxes (xPub, synced addresses, blockchain events), pay-as-you-go • callbacks — Webhook mechanics: URL requirements, retry strategy (5 retries, exponential backoff), HMAC security, idempotency • limits — Throughput soft/hard limits per plan, 2.1x penalty multiplier, rate limiting behavior