# PoolProof Chain Liveness Check

> PoolProof Chain Liveness Check is a paid API for AI agents from poolproof.ru, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Analyzes whether a blockchain is still alive by examining TVL trends across 1-year, 6-month, 90-day, and 30-day windows, flagging collapsed or declining ecosystems.

## Facts

- Endpoint: POST https://poolproof.ru/v1/chain
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/poolproof-chain-liveness-check-77d177d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VM4Ovaip7iBElUQ3tYni6

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 poolproof-chain-liveness-check-77d177d9 -d '<json body>'
```

Example prompt: Is the Fantom chain still alive? Check its TVL trend over the last year and flag it if it's collapsed, still falling, or just tiny.

## When to prefer this

Use this endpoint when you need a structured, multi-window TVL-based verdict on whether a blockchain is still viable — not just a current TVL snapshot. It is especially valuable when you need categorical flags (COLLAPSED, STILL_FALLING, TINY) to programmatically filter out dead or dying chains before routing capital, deploying contracts, or sourcing yield opportunities. Prefer this over raw TVL APIs when you need pre-computed trend analysis and risk flags rather than raw numbers.

## Known failure modes

- Unknown or unsupported chain identifier returns an error or empty verdict
- Chain with no indexed TVL history may return insufficient data
- Misspelled chain name may fail to resolve to a known chain
- Newly launched chains may lack enough historical windows to render a verdict

## How this service works

Is this chain alive: TVL trend over 1y/6m/90d/30d

## Output

Returns a JSON object with an 'ok' boolean, a 'verdict' string summarizing chain liveness, a 'disclaimer', and a 'flags' array of objects containing 'code' and 'msg' fields. Flag codes include COLLAPSED, STILL_FALLING, and TINY. An empty flags array means the chain passed all checks.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
   "ok": {
    "type": "boolean"
   },
   "flags": {
    "type": "array",
    "items": {
     "type": "object",
     "properties": {
      "msg": {
       "type": "string"
      },
      "code": {
       "type": "string"
      }
     }
    },
    "description": "Empty means nothing failed the checks"
   },
   "verdict": {
    "type": "string"
   },
   "disclaimer": {
    "type": "string"
   }
  }
 },
 "description": "TVL across 1y/6m/90d/30d windows. Separates a quiet ecosystem from an abandoned one. Flags COLLAPSED, STILL_FALLING, TINY."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/poolproof-chain-liveness-check-77d177d9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from poolproof.ru](https://www.zero.xyz/host/poolproof.ru/llms.txt)