Vend API Merchant

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

Start from extract.paypercall.dev — the other endpoints are on their own subdomains:

check — https://check.paypercall.dev/api/v1/check-link
domain — https://domain.paypercall.dev/api/v1/domain-info
search — https://search.paypercall.dev/api/v1/web-search

All four accept Nano (XNO) via x402 v2. See the x402 manifest for the full capability list.

Nano (XNO) x402 v2 Zero-fee No signup Self-verifying

Quick start

Any x402-capable client can call Vend. The flow is:

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

# 2. Pay the quoted Nano amount to nano_1yo6c1t6...hnjmnx7

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

API endpoints

Extract — clean text from any URL

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

Parameter	`url` (required)
Response 200	`{url, title, text, markdown, error, payment, receipt}`
Response 402	Payment required — x402 challenge in `PAYMENT-REQUIRED` header
Payment	`0.0001 XNO` to `nano_1yo6c1t6...`

Check Link — inspect an HTTP URL

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

Parameter	`url` (required)
Response 200	`{url, status_code, response_time_ms, final_url, redirect_chain, content_type, content_length, error, payment, receipt}`
Response 402	Payment required — x402 challenge in `PAYMENT-REQUIRED` header
Payment	`0.0001 XNO` to `nano_1yo6c1t6...`

Domain Info — DNS, WHOIS, SSL intelligence

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

Parameter	`domain` (required)
Response 200	`{domain, resolved_ip, dns, whois, ssl, http_headers, lookup_time_ms, error, payment, receipt}`
Response 402	Payment required — x402 challenge in `PAYMENT-REQUIRED` header
Payment	`0.0005 XNO` to `nano_1yo6c1t6...`

Web Search — search the web via DuckDuckGo

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

Parameter	`q` (required) — search query
Response 200	`{query, results: [{title, url, snippet, source}...], result_count, payment, receipt}`
Response 402	Payment required — x402 challenge in `PAYMENT-REQUIRED` header
Payment	`0.0001 XNO` to `nano_1yo6c1t6...`

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
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.

Comparison

Provider	Price	Settlement	Signup
Vend	$0.0002	Nano (XNO)	None
MERCURY Web Fetch	$0.003	USDC on Base	None
x402engine	$0.005	USDC on Base	None
x402 Valkyry	$0.002	USDC on Base	None

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

Last updated: 2026-09-17 · Source