HUD Income Limits (IL) for a US county or state — the program-eligibility thresholds for HUD assistance, derived from Area Median Family Income: extremely-low (30% AMI), very-low (50% AMI), and low (80% AMI) income limits for household sizes 1–8, plus the area median income. Look up by 5-digit county FIPS or by 2-letter state. Optional year (defaults to latest). The raw HUD il30/il50/il80 codes are reshaped into clear nested limits by household size. Source: HUD USER Income Limits API (US public domain).
/api/gov/income-limitsPAYMENT-SIGNATURE.The income limits API is a pay-per-call gov endpoint built for AI agents and autonomous software. HUD Income Limits (IL) for a US county or state — the program-eligibility thresholds for HUD assistance, derived from Area Median Family Income: extremely-low (30% AMI), very-low (50% AMI), and low (80% AMI) income limits for household sizes 1–8, plus the area median income.
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in income limits data source for an agent tool-use loop, an MCP host, or a backend that needs gov data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
fips | string | 5-digit US county FIPS, e.g. 06037 (Los Angeles County). match ^\d{5}$ |
state | string | 2-letter US state abbreviation, e.g. CA. match ^[A-Za-z]{2}$ |
year | string | Income-limit year, e.g. 2026. Omit for the latest. match ^\d{4}$ |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/gov/income-limits?fips=12345&state=example&year=12345' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/gov/income-limits?fips=12345&state=example&year=12345' \ -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/income-limits?fips=12345&state=example&year=12345'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.gov.incomeLimits({
"fips": "12345",
"state": "example",
"year": "12345"
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.gov.income_limits(fips="12345", state="example", year="12345")
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 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.income-limits",
"arguments": {
"fips": "12345",
"state": "example",
"year": "12345"
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"scope": "county",
"fips": "example",
"state": "example",
"year": "example",
"areaName": "example",
"medianIncome": 1,
"extremelyLow30pct": {
"hh1": 1,
"hh2": 1,
"hh3": 1,
"hh4": 1,
"hh5": 1,
"hh6": 1,
"hh7": 1,
"hh8": 1
},
"veryLow50pct": {
"hh1": 1,
"hh2": 1,
"hh3": 1,
"hh4": 1,
"hh5": 1,
"hh6": 1,
"hh7": 1,
"hh8": 1
},
"lowIncome80pct": {
"hh1": 1,
"hh2": 1,
"hh3": 1,
"hh4": 1,
"hh5": 1,
"hh6": 1,
"hh7": 1,
"hh8": 1
}
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}