# Underground Substrate Symposium Data Daily

> Underground Substrate Symposium Data Daily is a paid API for AI agents from underground.substratesymposium.com, paid per call via x402, $1/call, status unknown (last checked 2026-09-14).

Returns a signed daily snapshot of Underground traffic metrics including total hits, buy attempts, completed payments, unique operators, and paid-attempt rate for today.

## Facts

- Endpoint: GET https://underground.substratesymposium.com/api/data-daily
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/underground-substrate-symposium-data-daily-8299bc94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B9ktd_nCG4ikRYehpprWr

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 underground-substrate-symposium-data-daily-8299bc94
```

Example prompt: Pull today's signed daily snapshot from the Underground — I want to see total hits, completed payments, buy attempts, unique operators, and the paid-attempt rate.

## When to prefer this

Use this endpoint when you need a quick, authoritative, signed daily summary of Underground network activity — especially paid transaction volume and operator counts — without needing individual wallet-level detail. Ideal for monitoring agent economy health or benchmarking daily payment throughput.

## Known failure modes

- Payment not completed — endpoint returns 402 if $1 USDC payment via x402 is not provided
- No data yet for today if called very early in the day
- Network or server unavailability returns 5xx
- Malformed request returns 400

## How this service works

Data Daily - $1 signed snapshot of today's Underground traffic. Total hits, real signal, buy attempts, payments completed, unique named operators, paid-attempt rate. Aggregates only; no wallet addresses.

## Output

A cryptographically signed daily snapshot containing aggregated Underground traffic metrics: total hits, real signal count, buy attempts, payments completed, unique named operators, and paid-attempt rate. No wallet addresses are included — aggregates only.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "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/underground-substrate-symposium-data-daily-8299bc94/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from underground.substratesymposium.com](https://www.zero.xyz/host/underground.substratesymposium.com/llms.txt)