maritime.vessel

Look up vessels in the US Coast Guard PSIX registry by name (partial match), call sign, official number, hull number (HIN), flag country, service type, or build year. Returns matching vessels with the USCG vessel id, name, call sign, service type, build year, status, official number, HIN, and flag. Keyless, public-domain. Covers US-flagged vessels (and foreign vessels with US port-state-control activity). Pair the returned vesselId with maritime.cases for the inspection record. (Cross-references trade.locode for ports.)

price

$0.0010 USDC per call

method

GET/api/maritime/vessel

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
`name`	string	max 100 chars
`callSign`	string	max 40 chars
`officialNumber`	string	max 40 chars
`hullNumber`	string	max 40 chars
`flag`	string	max 60 chars
`service`	string	max 60 chars
`buildYear`	string	match ^\d{4}$
`vesselId`	string	match ^\d+$

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/maritime/vessel?name=example&callSign=example&officialNumber=example&hullNumber=example&flag=example&service=example&buildYear=12345&vesselId=12345'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/maritime/vessel?name=example&callSign=example&officialNumber=example&hullNumber=example&flag=example&service=example&buildYear=12345&vesselId=12345' \
  -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/maritime/vessel?name=example&callSign=example&officialNumber=example&hullNumber=example&flag=example&service=example&buildYear=12345&vesselId=12345'

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.maritime.vessel({
  "name": "example",
  "callSign": "example",
  "officialNumber": "example",
  "hullNumber": "example",
  "flag": "example",
  "service": "example",
  "buildYear": "12345",
  "vesselId": "12345"
})

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.maritime.vessel(name="example", callSign="example", officialNumber="example", hullNumber="example", flag="example", service="example", buildYear="12345", vesselId="12345")

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": "maritime.vessel",
    "arguments": {
      "name": "example",
      "callSign": "example",
      "officialNumber": "example",
      "hullNumber": "example",
      "flag": "example",
      "service": "example",
      "buildYear": "12345",
      "vesselId": "12345"
    }
  }
}

Response

Field	Type	Description
`ok`	boolean	one of: true
`items`	array
`total`	integer	Total matching rows upstream; null when unknown.
`source`	object

Example response datajson

{
  "ok": true,
  "items": [
    {
      "vesselId": 1,
      "name": "example",
      "callSign": "example",
      "serviceType": "example",
      "buildYear": 1,
      "status": "example",
      "officialNumber": "example",
      "hullNumber": "example",
      "flag": "example"
    }
  ],
  "total": 1,
  "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.