OneSource x402 API

Block, balance and token data over RPC.

✓ verified Oct 5, 2026

Host: api.onesource.io
Example request: GET https://api.onesource.io/api/chain/block-number?network=ethereum
Price per call: 0.001 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.onesource.io
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.GET https://api.onesource.io/api/chain/block-number?network=ethereum

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Burnbound is not affiliated with OneSource. 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 On-chain data x402 APIs

Learn more

Pay it from Claude Code with a spending cap

More On-chain data x402 APIs

Learn more