net.asn

Look up an Autonomous System (BGP) by AS number. Pass asn as AS3333 or 3333. Returns the AS holder/operator name, the IANA/RIR allocation block it falls in, whether it is currently announced, and a live routing-status block: first/last seen prefixes, announced IPv4/IPv6 prefix + address counts, RIS peer visibility, and observed BGP neighbour count. Data: RIPEstat (RIPE NCC), free and public. Distinct from geo.ip (host geolocation) and dns/whois (name lookups) — this is who-owns-and-routes-this-AS, observed live from the global routing table. For network forensics, abuse/security triage, and infrastructure mapping.

price
$0.0012 USDC per call
method
GET/api/net/asn
payment
x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)
auth
None. Sign the payment, retry with PAYMENT-SIGNATURE.
tier
Tier 0 — no paid upstream

Parameters

NameTypeDescription
asnrequiredstringAS number, e.g. AS3333 or 3333.
min 1 chars · max 15 chars

Code samples

cURLbash
# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/net/asn?asn=example'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/net/asn?asn=example' \
  -H 'PAYMENT-SIGNATURE: <base64-json-payload>'

# Or use the canonical runner (handles probe → sign → retry):
#   EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
#     --experimental-strip-types scripts/x402-pay.ts \
#     'https://2s.io/api/net/asn?asn=example'
TypeScript / Node — @2sio/sdktypescript
import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.net.asn({
  "asn": "example"
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)
Python — 2siopython
import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.net.asn(asn="example")

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)
MCP — Claude Desktop / AgentKit / any MCP hostjson
// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
//    EVM_PRIVATE_KEY funds x402 payments per call.

// claude_desktop_config.json
{
  "mcpServers": {
    "2sio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": { "EVM_PRIVATE_KEY": "0x..." }
    }
  }
}

// 2. Once the server is running, agents call this tool via standard MCP:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "net.asn",
    "arguments": {
      "asn": "example"
    }
  }
}

Response

FieldTypeDescription
asnnumber
resourcestring
holderstring
announcedboolean
blockobject
routingobject
sourcesarray
Example response datajson
{
  "asn": 1,
  "resource": "example",
  "holder": "example",
  "announced": false,
  "block": {
    "resource": "example",
    "name": "example",
    "description": "example"
  },
  "routing": {
    "found": false,
    "error": "example",
    "firstSeen": {
      "prefix": "example",
      "time": "example"
    },
    "lastSeen": {
      "prefix": "example",
      "time": "example"
    },
    "announcedV4": {
      "prefixes": 1,
      "ips": 1
    },
    "announcedV6": {
      "prefixes": 1,
      "slash48s": 1
    },
    "visibilityV4": {
      "seeing": 1,
      "total": 1
    },
    "visibilityV6": {
      "seeing": 1,
      "total": 1
    },
    "observedNeighbours": 1
  },
  "sources": [
    {
      "provider": "example",
      "url": "example",
      "license": "example"
    }
  ]
}

Discovery

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.