Marketplace · API · x402

wtsp.dev/v1/exists

Whether a number has a WhatsApp account, and nothing else: the cheapest way to clean a list before paying for profiles. /v1/profile gives the same answer plus the account's details. Query param: phone, with country code (e.g. +14155552671). Every answer is charged, “not on WhatsApp” included; a lookup WhatsApp does not answer is free.

Endpoint	`https://wtsp.dev/v1/exists`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~397 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0x539d036a305F78388dcA5FC49c27f9e29b83D315
method	GET
last updated	2026-11-04T03:45:00.876Z

Use it

Call it (an x402 client pays automatically)

curl -i https://wtsp.dev/v1/exists
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-bbb13869d38f8c7b

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}