gov.inmate-locator

Search the Federal Bureau of Prisons inmate locator — federal inmates from 1982 to present, both currently incarcerated and released. Search by lastName (+ optional firstName/middleName, age, sex, race) or by exact BOP register number (inmateNumber, e.g. "12345-678"). Each match: full name, register number, sex, race, age, current facility (code/name/type), projected release date, actual release date (when released). KYC, due-diligence, journalism, and background-research staple. Federal public data.

price

$0.0024 USDC per call

method

GET/api/gov/inmate-locator

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
`lastName`	string	min 2 chars · max 80 chars
`firstName`	string	min 1 chars · max 80 chars
`middleName`	string	min 1 chars · max 80 chars
`inmateNumber`	string	match ^\d{5}-\d{3}$
`age`	integer	min 18 · max 120
`sex`	string	one of: Male \| Female
`race`	string	max 40 chars

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/gov/inmate-locator?lastName=xx&firstName=example&middleName=example&inmateNumber=12345&age=18&sex=Male&race=example'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/gov/inmate-locator?lastName=xx&firstName=example&middleName=example&inmateNumber=12345&age=18&sex=Male&race=example' \
  -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/inmate-locator?lastName=xx&firstName=example&middleName=example&inmateNumber=12345&age=18&sex=Male&race=example'

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.inmateLocator({
  "lastName": "xx",
  "firstName": "example",
  "middleName": "example",
  "inmateNumber": "12345",
  "age": 18,
  "sex": "Male",
  "race": "example"
})

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.inmate_locator(lastName="xx", firstName="example", middleName="example", inmateNumber="12345", age=18, sex="Male", race="example")

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.inmate-locator",
    "arguments": {
      "lastName": "xx",
      "firstName": "example",
      "middleName": "example",
      "inmateNumber": "12345",
      "age": 18,
      "sex": "Male",
      "race": "example"
    }
  }
}

Response

Field	Type	Description
`count`	number
`capped`	boolean
`inmates`	array
`source`	object

Example response datajson

{
  "count": 1,
  "capped": false,
  "inmates": [
    {
      "name": {
        "first": "example",
        "middle": "example",
        "last": "example",
        "suffix": "example"
      },
      "inmateNumber": "example",
      "sex": "example",
      "race": "example",
      "age": 1,
      "facility": {
        "code": "example",
        "name": "example",
        "type": "example"
      },
      "projectedReleaseDate": "example",
      "actualReleaseDate": "example",
      "releaseCode": "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.