gov.lobbying-filings

Search US federal lobbying disclosures (Senate LDA filings) — who lobbies for whom, on what issues, for how much. Filter by registrant (lobbying firm name), client (organization being represented), lobbyist (individual name), year, period (first_quarter|second_quarter|third_quarter|fourth_quarter|mid_year|year_end), and type (e.g. RR=registration, Q1-Q4=quarterly reports). Each filing: type, year/period, reported income or expenses (USD), registrant + client (id/name/description/state), lobbying issues (code + description), lobbyist count, official document URL, posted timestamp. Money-in-politics, journalism, and policy-intelligence staple. Public federal data.

price

$0.0029 USDC per call

method

GET/api/gov/lobbying-filings

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
`registrant`	string	min 2 chars · max 120 chars
`client`	string	min 2 chars · max 120 chars
`lobbyist`	string	min 2 chars · max 120 chars
`year`	integer	min 1999 · max 2030
`period`	string	one of: first_quarter \| second_quarter \| third_quarter \| fourth_quarter \| mid_year \| year_end
`type`	string	max 8 chars
`page`	integer	min 1
`pageSize`	integer	min 1 · max 25

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/gov/lobbying-filings?registrant=xx&client=xx&lobbyist=xx&year=1999&period=first_quarter&type=example&page=1&pageSize=10'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/gov/lobbying-filings?registrant=xx&client=xx&lobbyist=xx&year=1999&period=first_quarter&type=example&page=1&pageSize=10' \
  -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/lobbying-filings?registrant=xx&client=xx&lobbyist=xx&year=1999&period=first_quarter&type=example&page=1&pageSize=10'

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.lobbyingFilings({
  "registrant": "xx",
  "client": "xx",
  "lobbyist": "xx",
  "year": 1999,
  "period": "first_quarter",
  "type": "example",
  "page": 1,
  "pageSize": 10
})

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.lobbying_filings(registrant="xx", client="xx", lobbyist="xx", year=1999, period="first_quarter", type="example", page=1, pageSize=10)

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.lobbying-filings",
    "arguments": {
      "registrant": "xx",
      "client": "xx",
      "lobbyist": "xx",
      "year": 1999,
      "period": "first_quarter",
      "type": "example",
      "page": 1,
      "pageSize": 10
    }
  }
}

Response

Field	Type	Description
`totalRecords`	number
`filings`	array
`source`	object

Example response datajson

{
  "totalRecords": 1,
  "filings": [
    {
      "filingUuid": "example",
      "type": "example",
      "typeDisplay": "example",
      "year": 1,
      "period": "example",
      "periodDisplay": "example",
      "income": 1,
      "expenses": 1,
      "registrant": {
        "id": 1,
        "name": "example",
        "description": "example"
      },
      "client": {
        "id": 1,
        "name": "example",
        "description": "example",
        "state": "example"
      },
      "issues": [
        {
          "code": "example",
          "description": "example"
        }
      ],
      "lobbyistCount": 1,
      "documentUrl": "example",
      "postedAt": "example"
    }
  ],
  "source": {
    "provider": "example",
    "url": "example",
    "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.