gov.risk-index

FEMA National Risk Index for a US county — the authoritative natural-hazard risk profile. Look up by countyFips (5-digit STCOFIPS), by state + county name, or by a lat/lon point. Returns the composite Risk Index score/rating/national-percentile (an 18-hazard model combining Expected Annual Loss × Social Vulnerability ÷ Community Resilience), each component (expected annual loss in dollars, social vulnerability, community resilience) with its rating, and per-hazard risk ratings + expected-annual-loss for all 18 natural hazards (wildfire, earthquake, hurricane, riverine & coastal flooding, tornado, heat/cold wave, drought, etc.). The structural natural-hazard risk picture an LLM can't recall — for siting, insurance, and resilience planning. Free, public-domain. Complements geo.flood-zone (which is flood SFHA only).

price

$0.0018 USDC per call

method

GET/api/gov/risk-index

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

Name	Type	Description
`countyFips`	string	match ^\d{5}$
`state`	string	min 2 chars · max 40 chars
`county`	string	min 2 chars · max 60 chars
`lat`	number	min -90 · max 90
`lon`	number	min -180 · max 180

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/gov/risk-index?countyFips=12345&state=xx&county=xx&lat=-90&lon=-180'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/gov/risk-index?countyFips=12345&state=xx&county=xx&lat=-90&lon=-180' \
  -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/gov/risk-index?countyFips=12345&state=xx&county=xx&lat=-90&lon=-180'

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.gov.riskIndex({
  "countyFips": "12345",
  "state": "xx",
  "county": "xx",
  "lat": -90,
  "lon": -180
})

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.gov.risk_index(countyFips="12345", state="xx", county="xx", lat=-90, lon=-180)

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": "gov.risk-index",
    "arguments": {
      "countyFips": "12345",
      "state": "xx",
      "county": "xx",
      "lat": -90,
      "lon": -180
    }
  }
}

Response

Field	Type	Description
`query`	object
`found`	boolean
`county`	string
`state`	string
`stateAbbrev`	string
`countyFips`	string
`population`	number
`riskIndex`	object
`expectedAnnualLoss`	object
`socialVulnerability`	object
`communityResilience`	object
`hazards`	array
`sources`	array
`note`	string

Example response datajson

{
  "query": {
    "countyFips": "example",
    "state": "example",
    "county": "example",
    "lat": 1,
    "lon": 1
  },
  "found": false,
  "county": "example",
  "state": "example",
  "stateAbbrev": "example",
  "countyFips": "example",
  "population": 1,
  "riskIndex": {
    "score": 1,
    "rating": "example",
    "nationalPercentile": 1
  },
  "expectedAnnualLoss": {
    "totalUSD": 1,
    "rating": "example",
    "nationalPercentile": 1
  },
  "socialVulnerability": {
    "score": 1,
    "rating": "example",
    "nationalPercentile": 1
  },
  "communityResilience": {
    "score": 1,
    "rating": "example",
    "nationalPercentile": 1
  },
  "hazards": [
    {
      "code": "example",
      "hazard": "example",
      "riskRating": "example",
      "riskScore": 1,
      "expectedAnnualLossUSD": 1
    }
  ],
  "sources": [
    {
      "provider": "example",
      "url": "example",
      "license": "example"
    }
  ],
  "note": "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.