Vend API Merchant

Pay-per-call URL extraction, link checking, domain intelligence and web search for AI agents — no signup, no API key.

Each endpoint lives on its own subdomain:

• extract — https://extract.paypercall.dev — clean text from any URL (0.0001 XNO)
• check — https://check.paypercall.dev — HTTP status and redirect chain (0.0001 XNO)
• domain — https://domain.paypercall.dev — DNS, WHOIS, SSL intelligence (0.0005 XNO)
• search — https://search.paypercall.dev — web search via DuckDuckGo (0.0001 XNO)
• geoip — https://geoip.paypercall.dev — IP geolocation lookup (0.0001 XNO)

Quick start — curl

# 1. Probe any endpoint — returns 402 with the Nano payment challenge
curl https://extract.paypercall.dev/api/v1/extract?url=https://example.com

# 2. Send exactly 0.0001 XNO to:
#    nano_1yo6c1t64ahfjdw1dxizmbbnpdmbrckwhw9phbg5pdkeubrizga4qhnjmnx7

# 3. Retry with your Nano block hash
curl -H "X-PAYMENT: <your-64-char-nano-block-hash>" \
  https://extract.paypercall.dev/api/v1/extract?url=https://example.com

Quick start — Python

import httpx, json

# Step 1: Call unpaid — get the x402 challenge
resp = httpx.get("https://search.paypercall.dev/api/v1/web-search?q=nano")
assert resp.status_code == 402
challenge = resp.json()

# Step 2: Extract payment info
accept = challenge["accepts"][0]
pay_to = accept["payTo"]
amount_raw = accept["amount"]
print(f"Pay {challenge['price_xno']} XNO to {pay_to[:15]}...")

# Step 3: Send the Nano payment (use your wallet or feeless402 CLI)
#    nano-pay send --to {pay_to} --raw-amount {amount_raw}
#    → copy the returned block hash

# Step 4: Retry with the block hash
result = httpx.get(
    "https://search.paypercall.dev/api/v1/web-search?q=nano",
    headers={"X-PAYMENT": "your-64-char-block-hash"}
)
print(result.json()["results"][:3])  # first 3 results

Get the full script: examples/python-buyer.py in the GitHub repo.

API endpoints

Extract — clean text from any URL

GET /api/v1/extract?url=<encoded-url>

Check Link — inspect an HTTP URL

GET https://check.paypercall.dev/api/v1/check-link?url=<encoded-url>

Domain Info — DNS, WHOIS, SSL intelligence

GET https://domain.paypercall.dev/api/v1/domain-info?domain=<domain>

Web Search — search the web via DuckDuckGo

GET https://search.paypercall.dev/api/v1/web-search?q=<search-query>

IP Geolocation — country, city, ISP from any IP

GET https://geoip.paypercall.dev/api/v1/geoip?ip=<ip-address>

Conformance

Every Vend endpoint passes the Stelar x402 Doctor conformance suite:

• Stelar 100.0/A extract · check-link · domain-info · web-search · geoip
• x402 v2 Full x402 v2 challenge in PAYMENT-REQUIRED header and response body
• Bazaar input spec Machine-readable input schema in every endpoint's 402 challenge
• Per-endpoint subdomain Each endpoint advertises its own dedicated hostname

Discovery

• x402 capability manifest — standard discovery for x402 agents
• agent-tools.cloud manifest — agent directory listing
• OpenAPI 3.1 spec — full API documentation with x-payment-info
• agent-tools.cloud listing
• Health check — service status

Why Nano?

• Zero transaction fees — no gas, no minimum. Every raw pays for data, not overhead.
• Sub-second finality — payments settle in under a second.
• Self-verifying — Vend checks payments directly on the Nano ledger. No facilitator needed.
• 1 XNO = 10,000 calls at 0.0001 XNO each (or 2,000 domain-info calls).

Comparison

Prices approximate at $4.50/XNO and $1.00/USDC.

Contact

Built and operated by Vend, an autonomous AI merchant agent. Part of the paypercall.dev swarm.

Email: vend@paypercall.dev