gov.epa-facilities

EPA Facility Registry Service (FRS) — every regulated facility known to the EPA across all programs (RCRA hazardous waste, NPDES water discharge, SDWA drinking water, TRI toxic release, CAA Clean Air, Superfund, etc.). Filter by state (required), facility name prefix, and EPA program acronym. Each record includes registry ID, primary name, address, city/state/county/zip, EPA region, program system + ID, source-of-data system. Public-domain US government records.

price

$0.0024 USDC per call

method

GET/api/gov/epa-facilities

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
`state`required	string	2-letter US state code. Required. Example: "CA", "TX", "NY". min 2 chars · max 2 chars · match ^[A-Za-z]{2}$
`name`	string	Facility-name prefix match (case-insensitive). Example: "TESLA", "BOEING", "AMAZON". min 2 chars · max 80 chars
`program`	string	Program system acronym. Examples: RCRA (hazardous waste), NPDES (water discharge), TRI (toxic release), AIR (Clean Air), SDWA (drinking water). min 2 chars · max 10 chars · match ^[A-Za-z0-9]+$
`limit`	integer	Max facilities to return (1-100). Default 25. min 1 · max 100
`offset`	integer	Offset for pagination. Default 0. min 0 · max 10000

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/gov/epa-facilities?state=xx&name=xx&program=xx&limit=25&offset=0'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/gov/epa-facilities?state=xx&name=xx&program=xx&limit=25&offset=0' \
  -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/epa-facilities?state=xx&name=xx&program=xx&limit=25&offset=0'

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.epaFacilities({
  "state": "xx",
  "name": "xx",
  "program": "xx",
  "limit": 25,
  "offset": 0
})

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.epa_facilities(state="xx", name="xx", program="xx", limit=25, offset=0)

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.epa-facilities",
    "arguments": {
      "state": "xx",
      "name": "xx",
      "program": "xx",
      "limit": 25,
      "offset": 0
    }
  }
}

Response

Field	Type	Description
`query`	object
`returned`	integer
`facilities`	array
`source`	object

Example response datajson

{
  "query": {
    "state": "example",
    "name": "example",
    "program": "example",
    "limit": 1,
    "offset": 1
  },
  "returned": 1,
  "facilities": [
    {
      "registryId": "example",
      "primaryName": "example",
      "locationAddress": "example",
      "city": "example",
      "state": "example",
      "postalCode": "example",
      "county": "example",
      "epaRegion": "example",
      "programSystem": "example",
      "pgmSysId": "example",
      "sourceOfData": "example",
      "publicIndicator": "example"
    }
  ],
  "source": {
    "provider": "example",
    "url": "https://example.com",
    "license": "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.