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QuantaFlow x402 API Gateway – Zippopotam Proxy
x402
QuantaFlow x402 API Gateway – Zippopotam Proxy is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).
Proxies requests to the Zippopotam postal code lookup API via x402 micropayment protocol, charging $0.01 USDC per call.
Price / call$0.01
Success—
StatusUnknown
How this service works
Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.
Output
Returns the upstream Zippopotam JSON response, which typically includes the postal code, country, country abbreviation, and an array of places with city name, state, state abbreviation, latitude, and longitude.
Example use cases
ZIP code to city name lookup
“What city and state does ZIP code 10001 belong to? I need the full place name and state abbreviation.”
Postal code validation for checkout
“Check if postal code SW1A 1AA is a valid UK postcode and tell me what place it maps to.”
Address enrichment from ZIP
“I have a list of US ZIP codes — start with 94103 and tell me the city, state, and country it corresponds to so I can fill in missing address fields.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/zippopotam?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need postal code geographic lookups (city, state, country, coordinates) and are operating in a web3/x402 micropayment context where per-call USDC billing is acceptable. Prefer it over direct Zippopotam access when you need payment-gated, metered usage without managing API keys, or when building DeFi-adjacent workflows that already use x402 payment rails.
Side effects
- Payment failure if wallet lacks sufficient USDC, returning a 402 Payment Required error
- Invalid or non-existent postal code returns a 404 from upstream Zippopotam
- Malformed path or query parameters result in an upstream error passed through
- Rate limiting or upstream Zippopotam downtime returns a 5xx error
- Incorrect country code prefix in path yields empty or error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| body | string | Optional JSON body forwarded to POST requests. |
| path | string | Path below the selected upstream origin. |
| query | object | |
| method | string |
Output
Schema · Response
{
"description": "The upstream response body and content type are passed through after successful payment."
}Tags
x402
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