Get fee recommendations for UTXO blockchains (bitcoin, bitcoin-cash, litecoin, dogecoin, dash, zcash). Use this before preparing or signing a transaction to determine the appropriate fee rate.

Actions: • get-fee-recommendations: Get recommended fee-per-byte tiers (slow/standard/fast) from the mempool • estimate-transaction-smart-fee: Estimate the fee rate needed for confirmation within a target number of blocks

Credits by action (source: OpenAPI): • estimate-transaction-smart-fee: bitcoin 510, bitcoin-cash 612, dash 561, dogecoin 561, litecoin 561, zcash 663 • get-fee-recommendations: bitcoin 510, bitcoin-cash 612, dash 561, dogecoin 561, litecoin 561, zcash 663

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

Get fee recommendations and estimate gas costs for EVM blockchains. Use this before preparing or signing a transaction to determine appropriate gas parameters.

Actions: • get-fee-recommendations: Get recommended gas price tiers (slow/standard/fast) • get-eip-1559-fee-recommendations: Get EIP-1559 fee parameters (baseFee, maxPriorityFee) for supported chains • estimate-native-coin-transfer-gas: Estimate gas for a native coin transfer (e.g. ETH, BNB) • estimate-token-transfer-gas: Estimate gas for an ERC-20/ERC-721 token transfer • estimate-contract-interaction-gas: Estimate gas for a smart contract call

Credits by action (source: OpenAPI): • estimate-contract-interaction-gas: arbitrum 192, avalanche 216, base 144, binance-smart-chain 300, ethereum 120, ethereum-classic 156, optimism 168, polygon 240, tron 180 • estimate-native-coin-transfer-gas: arbitrum 192, avalanche 216, base 144, binance-smart-chain 300, ethereum 120, ethereum-classic 156, optimism 168, polygon 240, tron 180 • estimate-token-transfer-gas: arbitrum 192, avalanche 216, base 144, binance-smart-chain 300, ethereum 120, ethereum-classic 156, optimism 168, polygon 240, tron 180 • get-eip-1559-fee-recommendations: arbitrum 48, avalanche 54, base 36, binance-smart-chain 75, ethereum 30, ethereum-classic 39, optimism 42, polygon 60, tron 45 • get-fee-recommendations: arbitrum 48, avalanche 54, base 36, binance-smart-chain 75, ethereum 30, ethereum-classic 39, optimism 42, polygon 60, tron 45

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

Blockchain Fees XRP: get fee recommendations. Networks: mainnet, testnet.

Credits per call: 20

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