Look up or list US Congressional amendments via Congress.gov. Pass congress + type + number to fetch a single amendment with full sponsor + action history. Or filter list by congress + type + date range. Amendment types: hamdt=House Amendment, samdt=Senate Amendment, suamdt=Senate Unprinted Amendment.
/api/gov/congress-amendmentPAYMENT-SIGNATURE.The congress amendment API is a pay-per-call gov endpoint built for AI agents and autonomous software. Look up or list US Congressional amendments via Congress.gov.
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 congress amendment 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 |
|---|---|---|
congress | integer | min 1 · max 200 |
type | string | one of: hamdt | samdt | suamdt |
number | integer | min 1 |
fromDate | string | match ^\d{4}-\d{2}-\d{2}$ |
toDate | string | match ^\d{4}-\d{2}-\d{2}$ |
limit | integer | min 1 · max 250 |
offset | integer | min 0 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/gov/congress-amendment?congress=1&type=hamdt&number=1&fromDate=2024-01-01&toDate=2024-01-01&limit=25&offset=0' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/gov/congress-amendment?congress=1&type=hamdt&number=1&fromDate=2024-01-01&toDate=2024-01-01&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/congress-amendment?congress=1&type=hamdt&number=1&fromDate=2024-01-01&toDate=2024-01-01&limit=25&offset=0'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.gov.congressAmendment({
"congress": 1,
"type": "hamdt",
"number": 1,
"fromDate": "2024-01-01",
"toDate": "2024-01-01",
"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)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.gov.congress_amendment(congress=1, type="hamdt", number=1, fromDate="2024-01-01", toDate="2024-01-01", 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)// 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.congress-amendment",
"arguments": {
"congress": 1,
"type": "hamdt",
"number": 1,
"fromDate": "2024-01-01",
"toDate": "2024-01-01",
"limit": 25,
"offset": 0
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object | |
meta | object |
{
"ok": true,
"items": [
{}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
},
"meta": {
"mode": "lookup"
}
}