Marketplace · API · x402

kevinhoff.com/api/paid/grade

X Preflight: read a draft post against X's open-sourced ranking code. Returns what is already settled before you post, whether it enters the pool strangers are drawn from, how long it stays retrievable, which filters delete it, and which gates nobody can know in advance. Every claim cites a file and line in X's published source. Never writes the post. Nothing stored.

Endpointhttps://kevinhoff.com/api/paid/grade
Trust✓ Verified callable · 100% uptime over 1 checks · ~228 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0x3A7292b88471691946D8D8856925e22246bed743
methodPOST
last updated2026-10-31T03:19:06.981Z

Use it

Call it (an x402 client pays automatically)

curl -i https://kevinhoff.com/api/paid/grade
# 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/x402-04716560e188e05c

Search the whole marketplace from your agent (MCP)

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