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Synapse API — opBNB Transaction History
x402
Synapse API — opBNB Transaction History is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Retrieves paginated transaction history for addresses on the opBNB blockchain network
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
Returns a list of transaction records on the opBNB network matching the specified filters, including transaction hashes, block numbers, from/to addresses, values, and optional metadata. Supports pagination via pageKey for large result sets.
Example use cases
Wallet activity audit for compliance
“Show me all transactions from opBNB address 0xDEF...456 between block 1000000 and 2000000, sorted ascending, with metadata included so I can audit the full activity trail.”
Incoming payment monitoring for a dApp
“Fetch the most recent 50 incoming transactions to my opBNB contract address 0x789...ABC, newest first, and exclude any zero-value ones so I only see real payments.”
Portfolio history for tax reporting
“Get the complete transaction history for opBNB wallet 0x111...222, all categories, sorted ascending from the earliest block, with metadata so I can calculate gains and losses for tax reporting.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/opbnb/tx/historyWhen to prefer
Choose this endpoint when you need historical transaction data specifically on the opBNB (BNB Layer 2) network, with fine-grained filtering by address, block range, category, and sort order. It supports pagination for large datasets and optional metadata enrichment. Prefer this over generic blockchain explorers when programmatic, pay-per-call access is needed within an automated agent workflow.
Side effects
- Invalid or malformed address returns an error or empty result
- Block range out of bounds or toBlock before fromBlock causes an error
- Unsupported category value returns a validation error
- Invalid pageKey causes pagination failure or empty response
- Payment not included or insufficient triggers a 402 Payment Required response
- Rate limiting or network congestion may cause timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| order | string | |
| pageKey | string | |
| toBlock | string | |
| category | array | |
| maxCount | number | |
| fromBlock | string | |
| toAddress | string | |
| fromAddress | string | |
| withMetadata | boolean | |
| excludeZeroValue | boolean |
Tags
x402
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