Exa x402 API

Semantic web search built for agents.

✓ verified Oct 5, 2026

Host: api.exa.ai
Example request: POST https://api.exa.ai/search
Price per call: 0.007 USDC on Base
Network: Base (eip155:8453)
Asset: USDC
Verification: Checked on Oct 5, 2026 at 23:59 UTC without paying: the URL answered a valid x402 v2 challenge, on this host, that Burnbound can pay.
Receiving address: fixed — Burnbound knows the seller's receiving addresses and pauses the listing if they change.
Payment success: Not enough data yet. Burnbound publishes this rate only when at least 5 organizations made 20 payments in 30 days.

Pay it from Claude Code with a spending cap

Add Burnbound's MCP server to Claude Code with your agent's key:

$ claude mcp add burnbound --scope user -e BURNBOUND_KEY=<your-agent-key> -- npx -y @burnbound/mcp

Get an agent key →

Give the agent a policy that allows this host and caps each payment, for example:

allowed hosts    api.exa.ai
max per payment  0.01 USD
daily cap        1 USD
network          Base (eip155:8453)

Ask your agent to call this endpoint. It pays with fetch_paid, inside the policy: anything over the cap is blocked or waits for your approval, and nothing is signed for any other host.POST https://api.exa.ai/search

Tavily — Web search with a summarized answer.
x402 Atlas Web Search — Web search within the x402 Atlas catalog.
You.com — Web and news search.

Learn more

Burnbound is not affiliated with Exa. These data come from Burnbound's own checks; prices can change, and what your agent's policy checks is the seller's 402 at payment time. All x402 APIs →

Pay it from Claude Code with a spending cap

More Search x402 APIs

Learn more

Pay it from Claude Code with a spending cap

More Search x402 APIs

Learn more