AgentKit x402

A small set of utility endpoints for AI agents. Each call is paid individually in USDC on Base using the x402 protocol: no account, no API key. Unpaid requests receive HTTP 402 with the payment requirements.

Endpoints

Endpoint	Price per call	What it does	Free sample
`GET /v1/email-check`	$0.002	Email address check	sample
`GET /v1/email-auth`	$0.01	Email authentication audit (SPF, DKIM, DMARC)	sample
`GET /v1/domain-dns`	$0.005	DNS records lookup	sample
`GET /v1/site-contacts`	$0.02	Website contact extraction	sample
`GET /v1/site-audit`	$0.02	One-page technical SEO audit and tech detection	sample
`GET /v1/url-markdown`	$0.005	URL to Markdown	sample
`GET /v1/se/validate`	$0.001	Swedish identifier validator	sample
`GET /v1/iban`	$0.001	IBAN validator	sample
`GET /v1/se/account-to-iban`	$0.002	Swedish bank account to IBAN	sample
`GET /v1/bank-days`	$0.001	Swedish bank-day calculator	sample

Machine-readable: openapi.json, llms.txt, /.well-known/x402, MCP. Send Accept: application/json to this page for JSON.

Payment

Scheme exact, x402 v2, network eip155:8453, asset USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, pay to 0x9f950fbeE661D8867750750F600Ff03fb7BAbe8D, facilitator https://facilitator.payai.network. Payment is settled only after a successful (2xx) response.

import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const signer = privateKeyToAccount(process.env.PRIVATE_KEY);
const client = new x402Client().register("eip155:*", new ExactEvmScheme(signer));
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agentkit-x402.erikssonanton2001.workers.dev/v1/email-check?email=anna@example.com");
console.log(await res.json());

Limits

Each paid call makes at most 6 outbound HTTP requests (robots.txt, redirects and extra pages included), with an 8 second timeout and a 1.5 MB cap per page. Larger pages are truncated and flagged.
Only http/https on ports 80 and 443 and public DNS names are fetched. IP addresses, localhost, internal names and URLs with credentials are rejected.
robots.txt is honoured for the user agent AgentKitBot and for "*". Disallowed pages return 403 blocked_by_robots.
No JavaScript is executed. Single-page applications that render in the browser return little or no content.
Email checks use syntax rules, lists and DNS only. No SMTP connection is made, so a deliverable mailbox is not confirmed.
DNS data comes from one resolver (cloudflare-dns.com over HTTPS) and can differ from what other resolvers return.
Swedish validators check formats and checksums. They do not prove that a person, company or account exists.
Requests that fail (HTTP 4xx or 5xx) are not settled; you are charged only when the response is successful (HTTP 2xx).
No guaranteed uptime or accuracy. The service runs on a free Cloudflare Workers plan and may rate-limit or fail under load.

Privacy

Contact extraction returns only information that a site publishes on its own pages. The caller is responsible for lawful use, in particular for email addresses and phone numbers of private individuals and sole traders (GDPR and similar laws). The service has no application-level storage and does not use a database or key-value store.

Crawler details: AgentKitBot. Contact: zenith-ops@mail.grokbot.com.