# Saylor Innovations Transit — Boston MBTA Real-Time Arrivals

> Saylor Innovations Transit — Boston MBTA Real-Time Arrivals is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-03).

Returns real-time arrival predictions for Boston MBTA subway, commuter rail, and bus lines at a given stop

## Facts

- Endpoint: GET https://saylorinnovations.com/api/transit/boston/arrivals?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-transit-boston-mbta-real-time-arrivals-c3d81dc3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Kc1ORFpNJB-Psl6m2hm23

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-transit-boston-mbta-real-time-arrivals-c3d81dc3
```

Example prompt: What are the next arrivals at Park Street station right now — I need to know if I can catch a subway or commuter rail train in the next few minutes.

## When to prefer this

Choose this endpoint when you need real-time Boston MBTA arrival predictions for a specific stop covering subway, commuter rail, or bus lines. Prefer this over generic transit APIs when the user is specifically in the Boston metro area and needs live departure boards rather than static schedule lookups.

## Known failure modes

- Stop name not recognized or misspelled — returns found: false with empty arrivals
- MBTA data feed temporarily unavailable — may return empty or stale results
- Ambiguous stop name matching multiple stations — may return results for wrong stop
- No upcoming arrivals scheduled (off-hours or service gap) — found: true but empty arrivals array
- Invalid or missing 'stop' query parameter — may return error or no results

## How this service works

Boston MBTA Real-Time Arrivals (subway, commuter rail, bus). Boston MBTA real-time departures at any station by name: subway, Green Line branches, commuter rail and bus, with destination, direction and minutes away.

## Output

Returns a JSON object with a 'found' boolean and, when found, an 'arrivals' array of objects containing real-time arrival predictions for the specified MBTA stop — including upcoming trains, buses, or commuter rail vehicles and their estimated arrival times.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "stop": {
       "type": "string",
       "description": "station name, e.g. Park Street, South Station (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "found"
     ],
     "properties": {
      "found": {
       "type": "boolean"
      },
      "arrivals": {
       "type": "array",
       "items": {
        "type": "object"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-transit-boston-mbta-real-time-arrivals-c3d81dc3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)