# Synapse Crypto Invoice Generator

> Synapse Crypto Invoice Generator is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Generates a USDC payment invoice for a list of items, returning a structured on-chain payment request on Base

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/crypto-invoice?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-crypto-invoice-generator-056321ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_echKSQ-QmcaLg08OX15Ff

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 synapse-crypto-invoice-generator-056321ee
```

Example prompt: Generate a crypto invoice in USDC on Base for these items: '2x API calls, 1x data report' so I can get a wallet address and total to pay.

## When to prefer this

Use this endpoint when you need to programmatically generate a structured USDC payment invoice for one or more line items, receive a Base-network wallet address to pay, and get back a unique invoice ID — all without creating an account or API key. Prefer this over traditional invoicing APIs when the payment needs to settle on-chain via Base/USDC and the caller is operating in an x402 pay-per-call environment.

## Known failure modes

- Missing or malformed 'items' parameter returns an error or empty invoice
- Items string not parseable may result in a zero-total invoice
- x402 payment not included before call results in 402 Payment Required response
- Network congestion on Base may cause delayed invoice confirmation
- Invalid item formats may produce incorrect totals

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

Returns a JSON object containing the payment token (USDC), the Base network wallet address to send funds to, the network identifier ('base'), the total amount in USD, and a unique invoice ID for tracking the payment.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "token": "USDC",
  "pay_to": "0x...",
  "network": "base",
  "total_usd": 0.5,
  "invoice_id": "..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-crypto-invoice-generator-056321ee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)