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Synapse API — X Layer Transaction History
x402
Synapse API — X Layer 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 X Layer (OKX) 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 paginated list of transactions on the X Layer network matching the specified filters, including transfer details such as from/to addresses, block numbers, transaction hashes, asset categories, and optionally enriched metadata. A pageKey is provided for fetching subsequent pages.
Example use cases
Wallet audit on X Layer
“Get me the full transaction history for wallet 0xDe...F1 on X Layer, sorted oldest to newest, including all transfer metadata, so I can audit its on-chain activity.”
Monitor incoming transfers to treasury
“Fetch all incoming transactions to address 0xAB...99 on X Layer from block 5000000 to 5500000, excluding zero-value transfers, and show me up to 50 results.”
Paginate through large transaction set
“I already fetched the first page of transactions for 0x12...34 on X Layer — now continue from pageKey 'abc-xyz' and give me the next 100 records in descending order.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/xlayer/tx/historyWhen to prefer
Use this endpoint when you need historical transaction data specifically for the X Layer (OKX Chain) blockchain. It supports flexible filtering by address direction, block range, transaction category, and ordering, making it suitable for wallet audits, portfolio analytics, and on-chain activity monitoring on X Layer. Prefer this over generic blockchain explorers when you need programmatic, paginated access with metadata enrichment.
Side effects
- Invalid address format returns validation error
- Unknown or malformed pageKey causes pagination failure
- fromBlock greater than toBlock returns empty result or error
- maxCount exceeding API limits may return partial results or error
- Unsupported category values may be silently ignored or cause error
- Network downtime on X Layer data provider causes 5xx response
- Missing required fields may return 400 bad request
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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