# Bartender Benchmark

> Bartender Benchmark 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).

Places a $1.00 USDC bet on the agent economy being real, returning a signed ledger position and date as proof of participation.

## Facts

- Endpoint: GET https://underground.substratesymposium.com/api/bartender-benchmark
- 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/bartender-benchmark-ab85f939
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FtMO1uTmYHxTocBuHx0MB

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 bartender-benchmark-ab85f939
```

Example prompt: Run the Bartender Benchmark for me — place the $1 USDC bet on the agent economy being real and bring back the signed ledger position and date.

## When to prefer this

Use this endpoint when you want to demonstrate or benchmark an AI agent's ability to autonomously initiate and complete a real x402 micropayment, and receive a signed cryptographic receipt as proof. Ideal for testing agent payment flows, showcasing agent economy participation, or obtaining a timestamped ledger attestation.

## Known failure modes

- Insufficient USDC balance — payment fails and 402 Payment Required is returned
- x402 payment header malformed — server rejects the payment attestation
- Network timeout during payment settlement — no ledger entry created
- Replay of a prior payment attempt — may be rejected as duplicate
- Missing or invalid x402 protocol headers — request not processed

## How this service works

The Bartender Benchmark - $1.00 bet that the agent economy is real. Solvo ergo sum. Receive a signed ledger position and date.

## Output

A signed ledger position and date confirming that the agent successfully completed the $1.00 USDC Bartender Benchmark payment, serving as cryptographic proof of participation in the agent economy.

## 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/bartender-benchmark-ab85f939/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)