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Documentation Index

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BlockRazor’s BSC Fast mode accelerates transaction submission by routing signed transactions through a globally distributed high-performance network with direct, low-latency connections to BSC validators. Compared to submitting through a standard public RPC node, Fast mode reduces the time from submission to block inclusion by bypassing conventional gossip propagation. New registered users receive a default throughput of 10 TPS. Three submission variants are available depending on your use case and tip configuration.

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Endpoint

POST https://fast.blockrazor.io/bsc
All requests must include your BlockRazor API token in the Authorization header.

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Authentication

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Authorization
string
required
Your BlockRazor API token formatted as a Bearer token: Bearer YOUR_AUTH_TOKEN. Obtain your token from the BlockRazor dashboard.

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Submission Variants

BlockRazor’s BSC Fast endpoint supports three methods for transaction submission. Each trades off tip requirements and rate limits differently.
The standard Fast mode submission path. Submit a signed transaction that includes a tip to BlockRazor’s designated address embedded in the transaction itself. The tip incentivizes validator prioritization and maximizes the speed of block inclusion.
  • Method: eth_sendRawTransaction
  • Tip required: Yes — include a BNB transfer to BlockRazor’s tip address
  • Default rate: 10 TPS for new registered users

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Request Parameters

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jsonrpc
string
required
JSON-RPC version string. Must be "2.0".
​
method
string
required
The RPC method for transaction submission: "eth_sendRawTransaction".
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params
array
required
Array with one element — the signed transaction data.
​
id
integer
Client-chosen request ID echoed in the response.

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Response

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result
string
The 32-byte transaction hash (0x-prefixed hex string) for the submitted transaction. Use eth_getTransactionReceipt to check confirmation status.
​
error
object
Present when the submission fails.

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Examples

curl -X POST https://fast.blockrazor.io/bsc \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer YOUR_AUTH_TOKEN' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sendRawTransaction",
    "params": ["0xSIGNED_TX_WITH_TIP"],
    "id": 1
  }'
For eth_sendRawTransaction and v2, you must include a BNB transfer to BlockRazor’s designated tip address within the transaction. Transactions submitted without a tip via these methods will not be prioritized and may be rejected by the Fast mode routing layer.
Use the Fast-Tx (SendTx) variant when you need fast submission without restructuring your transactions to include a tip. This is especially useful for simple transfer transactions where adding a separate tip output is not practical.

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Rate Limits

VariantNew User LimitSubscribed Limit
eth_sendRawTransaction10 TPS (default)Custom
eth_sendRawTransaction v210 TPS (default)Custom
Fast-Tx (SendTx)10 txs / 5s, 10 txs / day$500/month (no limits)
The Fast-Tx subscription service ($500/month) removes the daily and per-window rate limits for SendTx and enables high-throughput transaction propagation using BlockRazor’s high-performance network. Visit the BlockRazor pricing page for details.

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