Arbitrum × x711 + x711

x402 is live on Arbitrum. x711 agents pay per tool call in USDC — no subscriptions, no infra.

What you get

Arbitrum just made x402 official on May 14, 2026 — agentic commerce on the programmable economy. x711 is the gas station on top: 41 tools (web_search, price_feed, tx_simulate/broadcast, hive_read/write, llm_routing, code_sandbox, and more) accessible via a single endpoint, paid in USDC on Arbitrum via x402. Agents onboard in one curl, get an API key, and pay fractions of a cent per call. No subscription. No servers to run. Treasury: 0xb753be5Eac5B29c711051DfF91279834e9C9b9AC (18% platform fee, verified on Arbiscan). Gas on Arbitrum One is typically 5–10× cheaper than Ethereum L1 — making high-frequency agent loops economically viable. The free tier (10 calls/day, no key) works with zero on-chain setup.

Step 1 — Config

File: Any HTTP-capable agent or script

# Step 1 — Get an API key (free, 30 seconds)
curl -s -X POST https://x711.io/api/onboard \
  -H 'Content-Type: application/json' \
  -d '{"name":"my-arb-agent","framework":"http"}' | jq .api_key

# Step 2 — Call any tool with your key (credits, or x402 USDC on Arbitrum)
curl -X POST https://x711.io/api/refuel \
  -H 'X-API-Key: <your_key>' \
  -H 'Content-Type: application/json' \
  -d '{"tool":"web_search","query":"Arbitrum x402 agent tooling"}'

# Step 2 (alt) — Pay per-call via x402 on Arbitrum One (no key needed)
curl -X POST https://x711.io/api/refuel \
  -H 'X-Payment: x402; chain=arbitrum; token=USDC; tx=<your_arb_tx_hash>' \
  -H 'Content-Type: application/json' \
  -d '{"tool":"price_feed","symbol":"ETH"}'

# Treasury: 0xb753be5Eac5B29c711051DfF91279834e9C9b9AC (Arbitrum One — verify on Arbiscan)

Step 2 — Use it

41 tools, one endpoint. Simulate transactions before broadcasting (tx_simulate → tx_broadcast). Check contract addresses before any on-chain action with the free Hallucination Pill API at /api/pill. Full tool catalog at /api/tools. Machine-readable version of this page: https://x711.io/for-arbitrum.json

Sanity check (no install)

curl -X POST https://x711.io/api/refuel \
  -H 'Content-Type: application/json' \
  -d '{"tool":"web_search","query":"latest AI agent frameworks"}'

If that returns JSON with web search results, your network can reach x711.

Available tools

All prices in USDC, billed per call. Free tier waives the first 10 calls/day.

Why x711 is legit

• Open spec. agent.json · OpenAPI 3.1 · x402 manifest
• Open treasury. Every payment lands at 0xb753be5Eac5B29c711051DfF91279834e9C9b9AC on Base — verifiable on-chain.
• Open ledger. /api/attestations publishes every refuel as a hash-chained attestation.
• Live signal. /api/stats/live is an SSE stream of real refuels.

Other frameworks

Get an API key (free) Open API reference