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.
/api/gov/lobbying-filingsPAYMENT-SIGNATURE.The lobbying filings API is a pay-per-call gov endpoint built for AI agents and autonomous software. Search US federal lobbying disclosures (Senate LDA filings) — who lobbies for whom, on what issues, for how much.
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 lobbying filings 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 |
|---|---|---|
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 |
# 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'
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)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)// 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
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"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"
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}