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Synapse API — Kaia Blockchain Transaction History
x402
Synapse API — Kaia Blockchain 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 2026-09-13).
Retrieves paginated transaction history for addresses on the Kaia blockchain network, with filtering by block range, category, and address.
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 transaction records on the Kaia blockchain matching the specified filters, including sender/receiver addresses, block numbers, transaction categories, and optionally rich metadata such as token names, values, and timestamps. A pageKey is returned when more results are available.
Example use cases
Wallet activity audit for compliance
“Get me the full transaction history for Kaia wallet 0xAbC123... between block 5000000 and 6000000, sorted oldest to newest, and include all transaction metadata.”
Token transfer monitoring for a DApp
“Fetch the most recent 50 incoming transactions to our DApp contract at 0xDeF456... on Kaia, only for token transfer categories, and skip any zero-value ones.”
Paginated history for portfolio tracker
“I need to page through all transactions involving Kaia address 0x789GHI... — start from the page key abc123, pull up to 25 records at a time in descending order.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/kaia/tx/historyWhen to prefer
Choose this endpoint when you need structured, filterable transaction history specifically on the Kaia blockchain, with support for block-range filtering, address-level queries, category filtering, and pagination. Prefer this over generic block explorers when you need programmatic, pay-per-call access without rate-limit subscriptions.
Side effects
- Invalid or malformed address returns error response
- Block range too large may be rejected or timeout
- Invalid pageKey causes pagination failure
- Unsupported category value results in empty or error response
- Network unavailability causes 5xx error
- Payment failure via x402 prevents access
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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