# Seiche Undertow Attested Feed

> Seiche Undertow Attested Feed is a paid API for AI agents from api.seiche.info, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).

Returns a real-time, cryptographically attested snapshot of global money-market conditions, FX references, capital-market stress tiers, and bounded China macro signals with explicit timestamps and rights metadata.

## Facts

- Endpoint: GET https://api.seiche.info/undertow/x402/feed
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/seiche-undertow-attested-feed-81d6f709
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WJrX7GWBr8v3mQRtLrdWm

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 seiche-undertow-attested-feed-81d6f709
```

Example prompt: Pull the latest Seiche Undertow attested feed and tell me which money-market segments — especially HY and US Treasuries — are in stressed or normal tiers right now, along with the attestation hash so I can verify the data.

## When to prefer this

Choose this endpoint when you need a cryptographically attested, point-in-time snapshot of global money-market stress tiers, FX references, and macro conditions — especially when verifiability and data provenance (via post-quantum signatures) matter. Prefer it over generic financial data APIs when you need explicit rights metadata, bounded China macro signals, and sealed call audit trails in a single call.

## Known failure modes

- Payment not included or invalid — returns HTTP 402 requiring USDC payment via x402 protocol
- Malformed properties filter — may return empty or partial segment data
- Service temporarily unavailable — upstream data source lag may delay or block response
- Attestation generation failure — hash or signature fields may be null or incomplete
- Rate limiting — repeated calls in short succession may be throttled

## How this service works

Seiche connects dollar funding, an 11-pack global money-market atlas, public FX references, bounded capital-market transmission and metadata-only China macro evidence with explicit clocks, rights and gaps.

## Output

A JSON object with: an 'asof' date string, a 'board' object containing segment-level tier classifications (e.g. HY: STRAINED, UST: NORMAL), a 'service' label, an 'attestation' block with a how-to verification instruction, a pit_head hash, and a pqsig_root for post-quantum signature verification, plus a 'sealed_calls' array recording call IDs and cache outcomes (HIT/MISS).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asof": "2026-07-18",
  "board": {
   "segments": {
    "HY": {
     "tier": "STRAINED"
    },
    "UST": {
     "tier": "NORMAL"
    }
   }
  },
  "service": "undertow-attested-feed",
  "attestation": {
   "verify": {
    "howto": "python3 scripts/verify_record.py"
   },
   "pit_head": {
    "hash": "…"
   },
   "pqsig_root": {
    "root": "…"
   }
  },
  "sealed_calls": {
   "calls": [
    {
     "id": "…",
     "outcome": "HIT"
    }
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/seiche-undertow-attested-feed-81d6f709/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.seiche.info](https://www.zero.xyz/host/api.seiche.info/llms.txt)