# Relaystation Checkpoint Storage

> Relaystation Checkpoint Storage is a paid API for AI agents from api.relaystation.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Save and restore durable agent state snapshots — write a checkpoint at any point and resume from it later, billed per-use with no account required.

## Facts

- Endpoint: POST https://api.relaystation.ai/v1/storage/checkpoint
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/relaystation-checkpoint-storage-240f037f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ezzKcUA65aAoSADPW9cF-

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 relaystation-checkpoint-storage-240f037f -d '<json body>'
```

Example prompt: Save my current agent state as a checkpoint right now — I'm partway through processing this research task and want to be able to resume from exactly this point if something goes wrong.

## When to prefer this

Choose this endpoint when an AI agent needs durable, resumable state persistence between sessions or across failure boundaries — especially in long-running, multi-step workflows where losing progress is costly. It is particularly well-suited for agentic workloads where there is no persistent user account and the wallet serves as identity, making it ideal for autonomous agents operating in a pay-per-use x402 payment context on the Relaystation platform.

## Known failure modes

- Payload too large — checkpoint size exceeds allowed limits, returns size error
- Insufficient x402 wallet balance — payment fails, returns payment required error
- Malformed state payload — invalid or unserializable data, returns validation error
- Checkpoint ID not found on restore — snapshot expired or never written, returns not found
- Network timeout — transient failure during write, returns 5xx error

## How this service works

Save and restore agent state — durable snapshots you overwrite as you go and resume from anywhere. From $0.001, metered by size, lifetime, egress; no account, the wallet is the identity. Part of Relaystation: 155 agent tools on one balance — relaystation.ai

## Output

Returns a confirmation of the saved checkpoint including a checkpoint ID, size metadata, and any cost breakdown. The agent can later reference this checkpoint ID to restore the full state snapshot and resume execution from that point.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/relaystation-checkpoint-storage-240f037f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.relaystation.ai](https://www.zero.xyz/host/api.relaystation.ai/llms.txt)