geo.nearby

Everything around a coordinate in one call: nearby airports (IATA/ICAO, type, distance), public K-12 schools (name, district, enrollment, distance), NOAA climate stations (for chaining into /api/climate/station-history), and earthquakes from the past week (magnitude, depth, time). Pass lat/lon plus optional radiusKm (default 25, max 200) and per-category limit (default 5). Each category returns an independent found/error block, so one slow source never empties the rest. Site assessment, relocation research, travel planning, and risk screening. Each category is also a standalone endpoint (/api/airport/near, /api/edu/school-lookup, /api/climate/station-near, /api/quakes/recent).

price

$0.0036 USDC per call

method

GET/api/geo/nearby

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
`lat`required	number	min -90 · max 90
`lon`required	number	min -180 · max 180
`radiusKm`	number	min 1 · max 200
`limit`	integer	min 1 · max 20

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/geo/nearby?lat=-90&lon=-180&radiusKm=25&limit=5'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/geo/nearby?lat=-90&lon=-180&radiusKm=25&limit=5' \
  -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/geo/nearby?lat=-90&lon=-180&radiusKm=25&limit=5'

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.geo.nearby({
  "lat": -90,
  "lon": -180,
  "radiusKm": 25,
  "limit": 5
})

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.geo.nearby(lat=-90, lon=-180, radiusKm=25, limit=5)

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": "geo.nearby",
    "arguments": {
      "lat": -90,
      "lon": -180,
      "radiusKm": 25,
      "limit": 5
    }
  }
}

Response

Field	Type	Description
`lat`	number
`lon`	number
`radiusKm`	number
`airports`	object
`schools`	object
`climateStations`	object
`quakes`	object	Earthquakes within radiusKm (min 50km search radius) from the past 7 days, magnitude ≥ 2.
`sources`	array

Example response datajson

{
  "lat": 1,
  "lon": 1,
  "radiusKm": 1,
  "airports": {
    "found": false,
    "error": "example",
    "count": 1,
    "items": [
      {}
    ]
  },
  "schools": {
    "found": false,
    "error": "example",
    "count": 1,
    "items": [
      {}
    ]
  },
  "climateStations": {
    "found": false,
    "error": "example",
    "count": 1,
    "items": [
      {}
    ]
  },
  "quakes": {
    "found": false,
    "error": "example",
    "count": 1,
    "items": [
      {}
    ]
  },
  "sources": [
    {
      "provider": "example",
      "url": "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.