Blockfrost.io ~ API Documentation
★ Only Publicly Available OpenAPI DocumentFinanceBankingapiKey124 EndpointsREST
For Agents
Query the Cardano blockchain — accounts, addresses, assets, blocks, transactions, governance, and pools — and pin files to IPFS through one hosted API.
Use for: Look up the balance of a Cardano stake address, Find all transactions for a given Cardano payment address, Get the metadata for a native Cardano asset by policy ID, Retrieve the latest Cardano block hash and slot
Not supported: Does not build, sign, or custody Cardano transactions, and does not run smart contracts on-chain — use for reading Cardano state, submitting pre-signed transactions, and IPFS pinning only.
Jentic publishes the only available OpenAPI specification for Blockfrost.io, keeping it validated and agent-ready. Blockfrost is a hosted Cardano backend that exposes accounts, addresses, native assets, blocks, epochs, governance records, mempool state, pool data, scripts, transactions, and metadata across mainnet, preprod, and preview networks. It also includes IPFS pinning endpoints for storing off-chain content alongside Cardano transactions. Authentication uses a per-project header token, and a single project is scoped to one network.
Install Jentic One Beta
Connect the Blockfrost.io ~ API Documentation to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Blockfrost.io ~ API Documentation, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Blockfrost.io ~ API Documentation API.
Resolve a Cardano stake or payment address to its balance, UTxOs, and reward history
Look up native asset metadata, supply, and on-chain transaction history by policy ID
Retrieve block, epoch, and slot data including transaction lists and protocol parameters
Query Cardano governance state including DReps, proposals, votes, and committee members
Submit and inspect transactions, including raw CBOR retrieval for offline analysis
List active stake pools, their saturation, pledge, and historical performance
Pin and retrieve files on IPFS via the integrated gateway with Cardano-linked metadata
Use Cases
Patterns agents use Blockfrost.io ~ API Documentation API for, with concrete tasks.
★ Cardano wallet portfolio dashboard
Build a portfolio dashboard that resolves Cardano stake and payment addresses into balances, UTxO sets, asset holdings, and reward history. Blockfrost exposes /accounts/{stake_address}, /addresses/{address}, and /addresses/{address}/utxos, returning both ADA balances in Lovelaces and any native assets held. Pagination defaults to 100 items with a page query parameter, and results are sorted ascending unless ?order=desc is passed.
Call GET /accounts/{stake_address} for a given stake address and return the controlled_amount in ADA along with the rewards_sum.
Native asset and NFT lookup
Resolve Cardano native assets and NFTs by policy ID or asset fingerprint. The /assets, /assets/{asset}, /assets/policy/{policy_id}, and /assets/{asset}/transactions endpoints return supply, metadata, mint history, and ownership transfers. This supports NFT marketplace listings, collection explorers, and royalty tracking workflows.
Call GET /assets/policy/{policy_id} for a Cardano NFT collection policy ID and return the list of asset names with their initial mint transaction hashes.
Governance and DRep tracking
Track Cardano on-chain governance under the Conway era. Blockfrost exposes /governance/dreps, /governance/dreps/{drep_id}/votes, and /governance/proposals to enumerate delegated representatives, their voting records, and active governance proposals with parameters and withdrawals. Useful for governance dashboards, DRep discovery tools, and on-chain political analytics.
Call GET /governance/dreps and return the top 10 DReps ordered by voting power, including their drep_id and amount.
Stake pool analytics
Power stake pool analytics with /pools, /pools/{pool_id}, /pools/{pool_id}/history, and /pools/{pool_id}/delegators. The endpoints return pledge, saturation, declared margin, fixed cost, and per-epoch rewards. Combine with /epochs/{number}/parameters to compute effective ROA per epoch and surface staking recommendations.
Call GET /pools/{pool_id}/history?count=10 and return the per-epoch rewards and active stake values for the last ten epochs.
AI agent Cardano research assistant
Let an AI agent answer Cardano questions by searching Jentic for the right Blockfrost operation, loading its schema, and executing the call with the project_id token held in the Jentic vault. The agent never reads the Blockfrost docs site or handles the raw API key — it discovers operations by intent and executes against mainnet, preprod, or preview based on which token is loaded.
Search Jentic for 'look up a Cardano address balance', load the schema for the matching Blockfrost operation, and execute it for stake address stake1u9...
Key Endpoints
124 endpoints — jentic publishes the only available openapi specification for blockfrost.
METHOD
PATH
DESCRIPTION
GET
/accounts/{stake_address}
Get balance and reward history for a stake address
GET
/addresses/{address}
Resolve a payment address to its current state
GET
/assets/{asset}
Look up a native asset by fingerprint
GET
/blocks/latest
Return the most recent block on the chain
GET
/governance/dreps
List Cardano DReps and their voting power
GET
/pools/{pool_id}
Get a stake pool's parameters and current state
GET
/epochs/latest/parameters
Return the current epoch's protocol parameters
GET
/genesis
Return Cardano network genesis parameters
GET
/accounts/{stake_address}
Get balance and reward history for a stake address
GET
/addresses/{address}
Resolve a payment address to its current state
GET
/assets/{asset}
Look up a native asset by fingerprint
GET
/blocks/latest
Return the most recent block on the chain
GET
/governance/dreps
List Cardano DReps and their voting power
GET
/pools/{pool_id}
Get a stake pool's parameters and current state
GET
/epochs/latest/parameters
Return the current epoch's protocol parameters
GET
/genesis
Return Cardano network genesis parameters
Why Jentic?
Three things that make agents converge on Jentic-routed access.
Credential isolation
The project_id header token is stored encrypted in the Jentic vault. Agents receive scoped execution access — the raw token never enters agent context, and per-network tokens (mainnet, preprod, preview, IPFS) are isolated under separate credentials.
Intent-based discovery
Agents search by intent (e.g. 'look up a Cardano stake pool') and Jentic returns the matching Blockfrost operation across the 124 endpoints with its input schema, so the agent can call the right path without browsing the docs.
Time to first call
Direct integration: 1-2 days for token rotation per network, pagination, and rate-limit backoff handling. Through Jentic: under 30 minutes — search, load, execute.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Blockfrost.io ~ API Documentation API through Jentic.
Why is there no official OpenAPI spec for Blockfrost.io?
Blockfrost does publish endpoint documentation, but Jentic generates and maintains the structured OpenAPI specification used here so that AI agents and developers can call Blockfrost.io via consistent tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.
What authentication does the Blockfrost API use?
Blockfrost requires a project_id token sent in the project_id HTTP header. Each token is scoped to a single network — mainnet, preprod, preview, or IPFS — so switching networks means switching tokens. Through Jentic, the token is held in the encrypted vault and injected at execution; the agent never sees the raw value.
Can I submit Cardano transactions through this API?
Yes. POST /tx/submit accepts a CBOR-serialised signed transaction and returns the transaction hash if accepted by the network. You build and sign the transaction client-side (typically with cardano-serialization-lib or a wallet), then send the bytes to Blockfrost for relay to the node.
What are the rate limits for the Blockfrost API?
Blockfrost limits each IP to 10 requests per second with a burst of 500 requests, cooling off at 10 requests per second. On top of that, daily request quotas apply per project based on your Blockfrost plan. Exceeding the daily quota returns HTTP 402, and sustained flooding triggers HTTP 418 auto-bans.
How do I look up Cardano native assets through Jentic?
Search Jentic for 'look up a Cardano native asset by policy ID', load the schema for /assets/policy/{policy_id}, and execute it. The returned list contains asset fingerprints you can pass to /assets/{asset} for full metadata. Install the SDK with pip install jentic and call await client.execute(ExecutionRequest(...)).
Does Blockfrost cover Cardano governance and DReps?
Yes. The /governance/dreps, /governance/dreps/{drep_id}/votes, and /governance/proposals endpoints return Conway-era governance state including delegated representatives, voting records, proposals, and parameter change requests. Use these to build governance dashboards or DRep discovery tools.
Can I pin files to IPFS with Blockfrost?
Yes. The IPFS endpoints (/ipfs/add, /ipfs/pin/add/{IPFS_path}, /ipfs/pin/list) let you upload up to 100MB per file, pin content, and query pin status. Note that pinning requires an IPFS-network project_id, not a Cardano network token.
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