Today we're releasing the Transfa Data API, bringing indexed Tempo blockchain state directly into your application.
What is the Transfa Data API?
The Data API is a hosted service that exposes indexed, queryable blockchain state for the Tempo payment chain. Token metadata, wallet balances, transfer history, allowances, and access keys, all available through a single REST API.
If you've worked with raw blockchain RPCs before, you know the pain. You get low-level primitives: call a contract, read a storage slot, get a transaction by hash. But building a real product means you need higher-level queries. What tokens does this wallet hold? What's the transfer history for this address? You end up building an indexer, a database, and an API layer before you can ship anything useful. We built that so you don't have to.
Available endpoints
The Data API covers the core indexed state for Tempo:
- Tokens — List, search, and filter tokens on the network. Includes metadata like symbol, decimals, and total supply.
- Wallet balances — Get all token balances for a given wallet in a single call. No more iterating over token contracts one by one.
- Transfer history — Full transfer activity for any wallet, with pagination and filtering by token, direction, and date range.
- Access keys — Query account access keys and their permissions. Useful for verifying account configuration and key rotation.
- Allowances — Check token spending allowances between accounts. Critical for building approval-aware flows.
We're adding new endpoints every week. If there's something you need, reach out.
Why Tempo?
Tempo is a Layer 1 blockchain purpose-built for payments. Unlike general-purpose chains where payment workloads compete with DeFi, NFTs, and everything else for blockspace, Tempo treats payments as a first-class primitive. Dedicated payment lanes guarantee reserved throughput, transaction fees target fractions of a cent even under load, and finality is sub-second with no reorgs.
The chain is stablecoin-native. Users pay fees directly in USD stablecoins, no need to hold or manage a separate volatile gas token. Structured memo fields let you attach invoice numbers and identifiers to transactions, which makes reconciliation with accounting systems straightforward instead of an afterthought. These are the kinds of details that matter when you're building real payment products, and they're baked into the protocol rather than bolted on at the application layer.
The Data API currently targets Moderato, Tempo's active testnet.
Built for Tempo
Every endpoint is designed around Tempo's native primitives. Where other providers offer generic EVM indexing that you have to adapt, the Data API understands Tempo's token policies, TIP20 transfers, fee abstraction patterns, and memo-tagged payments out of the box. You get the right data model from the start, not a generic one you have to work around.
Try it out
Send a request to see the response.
Get started
The Data API is currently in preview and free to use while in preview. Sign up for an API key and make your first call in under five minutes. Read the documentation to see all available endpoints and response formats.