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Synapse Crypto Invoice Generator
x402
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
Price / call$0.002
Success—
StatusUnknown
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.
Example use cases
On-chain invoice for freelance services
“Create a USDC invoice on Base for these services: '3 hours consulting, 1 report delivery' — I need the wallet address to send payment to and the total amount in USD.”
Agent billing a user for API usage
“Generate a crypto payment invoice for the following usage items: '50 API calls at $0.002 each, 1 premium data pull at $0.05' — give me the invoice ID and pay-to address on Base.”
Checkout summary for digital goods
“I need a USDC invoice on Base for '1x market data subscription, 2x email intel lookups' — what's the total and where do I send the payment?”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/crypto-invoice?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | string |
Output
Schema · Response
{
"type": "json",
"example": {
"token": "USDC",
"pay_to": "0x...",
"network": "base",
"total_usd": 0.5,
"invoice_id": "..."
}
}Tags
x402
Reviews
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How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
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