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Blocknative for AI agents

Blocknative gives blockchain developers real-time visibility into the mempool, tracking pending transactions and gas prices across chains before those transactions confirm. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect BlocknativeSee the 10 actions ↓
Developer toolsAPI keyMCP + RESTblocknative.com
AUDIT LOG · BLOCKNATIVEPOLICY: acme-support
09:41:07 · claude · u_8f2read
blocknative.get_gas_prices
Get Gas Prices✓ allowed · 212ms
09:41:08 · claude · u_8f2read
blocknative.get_gas_oracles
Get Gas Oracles✓ allowed · 164ms
09:41:09 · claude · u_8f2write
blocknative.configure_filters
Configure Mempool Filters✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
blocknative.unsubscribe_multichain
Unsubscribe Multichain✕ blocked · policy: deny
EVERY BLOCKNATIVE CALL, ON THE RECORD
01 · USE CASES

What agents do in Blocknative.

01

Check current gas prices

Read-only lookup of gas price and base fee estimates across supported chains before submitting a transaction.

02

Track a pending transaction

Subscribe to a specific transaction hash so the agent can alert the user when it confirms or drops.

03

Require approval before changing filters

Treat updating mempool filters for a chain as a change needing confirmation before it alters what gets monitored.

02 · ACTIONS

10 Blocknative actions, graded by risk.

Every Blocknative action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

4

Look things up. Allowed by default.

  • blocknative.get_gas_prices
    Get Gas Prices
  • blocknative.get_gas_oracles
    Get Gas Oracles
  • blocknative.get_gas_distribution
    Get Gas Price Distribution
  • blocknative.get_supported_chains
    Get Supported Chains

write

4

Create and change things. Allow, or ask the user first.

  • blocknative.configure_filters
    Configure Mempool Filters
  • blocknative.subscribe_multichain
    Subscribe Multichain
  • blocknative.subscribe_transaction_hash
    Subscribe Transaction Hash
  • blocknative.prediction_api_basefee_estimates
    Get Base Fee Estimates

destructive

2

Delete, cancel or archive. Ask first, or deny outright.

  • blocknative.unsubscribe_multichain
    Unsubscribe Multichain
  • blocknative.unsubscribe_transaction_hash
    Unsubscribe Transaction Hash
03 · HOW IT WORKS

Blocknative in three steps.

  1. 01Your users connect BlocknativeThey add their Blocknative api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “configure Mempool Filters” can wait for the user, and “unsubscribe Multichain” can be denied outright.
  3. 03Any agent can actYour agent calls Blocknative through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('blocknative', {
  read: 'allow',
  write: 'ask',        // configure_filters
  destructive: 'deny',  // unsubscribe_multichain
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Blocknative connects.

Users add their Blocknative api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Blocknative connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Blocknative from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More developer tools apps.

GitHub896 actionsSupabase129 actions0CodeKit8 actionsAbly25 actionsAbstract3 actionsAddressfinder17 actionsAddresszen2 actionsAlchemy36 actions
ALL DEVELOPER TOOLS APPS →
07 · FAQ

Blocknative and Arc0, answered.

Q01

Can I use Blocknative with Claude, ChatGPT or Cursor?

Yes. Connect Blocknative to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Blocknative actions you allow.

Q02

How do users connect Blocknative?

Users add their Blocknative api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Blocknative actions can my agent take?

10 in total: 4 read, 4 write and 2 destructive, such as “configure Mempool Filters”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Blocknative?

Yes. Actions like “unsubscribe Multichain” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Blocknative too?

Yes. The same Blocknative connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Blocknative into your agent.

Your users connect Blocknative once, under your brand. Your agent gets 10 actions behind your policies, with every call on the record.

Connect BlocknativeBrowse all apps →

Free to build · MCP + REST · Audit log on every plan