phone.normalize

Parse, validate and canonicalize a phone number using Google's libphonenumber metadata. Query: number (required; E.164 like "+14155552671" or national like "(415) 555-2671"), country (optional ISO 3166-1 alpha-2 like US/GB/JP — required when number is not E.164). Returns {input, valid (matches a real number range), possible (right shape/length), e164, national, international, rfc3966, country, countryCallingCode, type (mobile|fixed_line|fixed_line_or_mobile|toll_free|premium_rate|shared_cost|voip|personal_number|pager|uan|voicemail|unknown), possibleCountries[]}. Returns valid:false (not an error) for unparseable input.

price

$0.0010 USDC per call

method

GET/api/phone/normalize

payment

x402 v2 · EIP-3009 transferWithAuthorization · USDC on Base mainnet

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`number`required	string	Phone number to normalize. E.164 (+15555551234) or a national format if country is provided. min 1 chars · max 40 chars
`country`	string	ISO 3166-1 alpha-2 country code (e.g. US, GB, JP). Required when number is not in E.164 form. match ^[A-Z]{2}$

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/phone/normalize?number=example&country=example'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/phone/normalize?number=example&country=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/phone/normalize?number=example&country=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.phone.normalize({
  "number": "example",
  "country": "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.phone.normalize(number="example", country="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": "phone.normalize",
    "arguments": {
      "number": "example",
      "country": "example"
    }
  }
}

Response

Field	Type	Description
`input`	string	The exact input string we received.
`valid`	boolean	True if the number matches a real, in-use number range for its country.
`possible`	boolean	True if the number is the right length/shape, even if not necessarily assigned.
`e164`	string	E.164 canonical form (e.g. +14155552671). Null if unparseable.
`national`	string	Country-local format (e.g. "(415) 555-2671"). Null if unparseable.
`international`	string	Pretty international format (e.g. "+1 415 555 2671"). Null if unparseable.
`rfc3966`	string	RFC 3966 tel: URI form (e.g. "tel:+14155552671"). Null if unparseable.
`country`	string	ISO 3166-1 alpha-2 country code, or null when ambiguous across +cc.
`countryCallingCode`	string	Country calling code with leading + (e.g. "+1"). Null if unparseable.
`type`	string	Number type. "unknown" when libphonenumber cannot classify. one of: fixed_line \| mobile \| fixed_line_or_mobile \| toll_free \| premium_rate \| shared_cost \| voip \| personal_number \| pager \| uan \| voicemail \| unknown
`possibleCountries`	array	All ISO 3166-1 alpha-2 codes this number could belong to.

Example response datajson

{
  "input": "example",
  "valid": false,
  "possible": false,
  "e164": "example",
  "national": "example",
  "international": "example",
  "rfc3966": "example",
  "country": "example",
  "countryCallingCode": "example",
  "type": "fixed_line",
  "possibleCountries": [
    "example"
  ]
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

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.