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Genesis402 by UnyKorn (x402 pay-per-call)

by io.github.FTHTrading
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Check email or domain deliverability

genesis402_email_check

Paid ($0.003 USDC). Deliverability and trust check for an email address or domain. Use to vet a signup email or an inbound sender. For the domain's registration age and registrar use genesis402_whois. Returns whether it can receive mail (MX), the hosting provider, SPF and DMARC records and policy, a disposable-domain flag and a 0-5 trust score. DNS-only: no SMTP probe, no email sent, the mailbox is never contacted. Payment: call once without payment_signature to get the exact price quote (nothing is charged or signed), then call again with the signed payment to receive the result and settlement details.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
email_or_domainYesA full email address (user@domain.com) or a bare domain (domain.com), without scheme or path.
payment_signatureNoOptional. An x402 v2 payment you signed for this call's quote (the PAYMENT-SIGNATURE header value). Omit to get the price quote first; nothing is charged without it.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
modeYesQUOTE_ONLY: price quote only, nothing signed or charged. PAID: the call was paid and result holds the data. FREE: the endpoint answered without payment.
paidYestrue only when a payment was settled for this call.
priceNoThe Base USDC quote. Present on QUOTE_ONLY and on PAID calls made by a local payer; null when the rail offered no Base USDC lane or the caller signed the payment.
resultNoPAID or FREE: the endpoint's JSON result.
resourceNoQUOTE_ONLY: the full URL of the paid resource.
how_to_payNoQUOTE_ONLY: how to sign and resend the call.
settlementNoPAID: decoded PAYMENT-RESPONSE settlement (transaction hash, network, payer), or null if the rail sent none.
what_you_getNoQUOTE_ONLY: the rail's description of what the payment buys.
payment_required_b64NoQUOTE_ONLY: the raw base64 PAYMENT-REQUIRED header, to sign with any x402 v2 client.
also_accepted_networksNoQUOTE_ONLY: every network the 402 challenge accepts.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed17 schema fields changed
    • changedInput schema / properties / email_or_domain / description
      Previous value: -"An email address or bare domain, e.g. jane@acme.com or acme.com."New value: +"A full email address (user@domain.com) or a bare domain (domain.com), without scheme or path."
    • changedInput schema / properties / payment_signature / description
      Previous value: -"Optional. An x402 v2 payment you signed for this call's quote (the PAYMENT-SIGNATURE header value). Omit to get the price quote first."New value: +"Optional. An x402 v2 payment you signed for this call's quote (the PAYMENT-SIGNATURE header value). Omit to get the price quote first; nothing is charged without it."
    • changedOutput schema / properties / also_accepted_networks / description
      Previous value: -"Other payment networks this endpoint accepts."New value: +"QUOTE_ONLY: every network the 402 challenge accepts."
    • changedOutput schema / properties / how_to_pay / description
      Previous value: -"How to pay for this call."New value: +"QUOTE_ONLY: how to sign and resend the call."
    • changedOutput schema / properties / mode / description
      Previous value: -"QUOTE_ONLY when no payment was made; the quote is in price."New value: +"QUOTE_ONLY: price quote only, nothing signed or charged. PAID: the call was paid and result holds the data. FREE: the endpoint answered without payment."
    • addedOutput schema / properties / mode / enum
      Added value: +[
+  "QUOTE_ONLY",
+  "PAID",
+  "FREE"
+]
    • changedOutput schema / properties / paid / description
      Previous value: -"true or the paid quote when payment settled."New value: +"true only when a payment was settled for this call."
    • addedOutput schema / properties / paid / type
      Added value: +"boolean"
    • changedOutput schema / properties / payment_required_b64 / description
      Previous value: -"The raw x402 PAYMENT-REQUIRED header, base64."New value: +"QUOTE_ONLY: the raw base64 PAYMENT-REQUIRED header, to sign with any x402 v2 client."
    • addedOutput schema / properties / price / anyOf
      Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "atomic": {
+        "description": "Price in USDC atomic units (6 decimals), as a decimal string.",
+        "type": "string"
+      },
+      "network": {
+        "description": "CAIP-2 network id of the lane, eip155:8453 (Base).",
+        "type": "string"
+      },
+      "payTo": {
+        "description": "Address the payment settles to.",
+        "type": "string"
+      },
+      "usd": {
+        "description": "Price in US dollars.",
+        "type": "number"
+      }
+    },
+    "required": [
+      "atomic",
+      "usd",
+      "payTo",
+      "network"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedOutput schema / properties / price / description
      Previous value: -"Quote on Base USDC: atomic, usd, payTo, network."New value: +"The Base USDC quote. Present on QUOTE_ONLY and on PAID calls made by a local payer; null when the rail offered no Base USDC lane or the caller signed the payment."
    • changedOutput schema / properties / resource / description
      Previous value: -"The endpoint URL that was quoted or called."New value: +"QUOTE_ONLY: the full URL of the paid resource."
    • changedOutput schema / properties / result / description
      Previous value: -"The endpoint's response data."New value: +"PAID or FREE: the endpoint's JSON result."
    • changedOutput schema / properties / settlement / description
      Previous value: -"Decoded x402 settlement (tx hash, network, payer)."New value: +"PAID: decoded PAYMENT-RESPONSE settlement (transaction hash, network, payer), or null if the rail sent none."
    • changedOutput schema / properties / what_you_get / description
      Previous value: -"What the paid call returns."New value: +"QUOTE_ONLY: the rail's description of what the payment buys."
    • addedOutput schema / properties / what_you_get / type
      Added value: +"string"
    • addedOutput schema / required
      Added value: +[
+  "mode",
+  "paid"
+]
  2. Changed2 schema fields changed
    • addedInput schema / properties / email_or_domain / description
      Added value: +"An email address or bare domain, e.g. jane@acme.com or acme.com."
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "also_accepted_networks": {
+      "description": "Other payment networks this endpoint accepts.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "how_to_pay": {
+      "description": "How to pay for this call.",
+      "type": "string"
+    },
+    "mode": {
+      "description": "QUOTE_ONLY when no payment was made; the quote is in price.",
+      "type": "string"
+    },
+    "paid": {
+      "description": "true or the paid quote when payment settled."
+    },
+    "payment_required_b64": {
+      "description": "The raw x402 PAYMENT-REQUIRED header, base64.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "price": {
+      "description": "Quote on Base USDC: atomic, usd, payTo, network."
+    },
+    "resource": {
+      "description": "The endpoint URL that was quoted or called.",
+      "type": "string"
+    },
+    "result": {
+      "description": "The endpoint's response data."
+    },
+    "settlement": {
+      "description": "Decoded x402 settlement (tx hash, network, payer)."
+    },
+    "what_you_get": {
+      "description": "What the paid call returns."
+    }
+  },
+  "type": "object"
+}
  3. First observed

TDQS

A4.8/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only say readOnlyHint=false and openWorldHint=true; the description adds the cost ($0.003 USDC), the exact two-call payment handshake, and a clear safety boundary ('DNS-only: no SMTP probe, no email sent, the mailbox is never contacted'). This explains why readOnlyHint is false (payment settlement) rather than contradicting it.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loads the cost and purpose, then layers usage, return summary, safety boundary, and payment mechanics with no wasted sentences. Slightly dense in a single paragraph, and payment is split between the first and last sentence, but every sentence carries distinct information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values need not be spelled out, yet the description still summarizes them (MX, hosting provider, SPF/DMARC policy, disposable flag, 0-5 trust score). Combined with the payment flow and safety disclosure, an agent has everything needed to invoke it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so both parameters are already documented, which sets a baseline of 3. The description goes further by explaining the semantics of the optional payment_signature as a two-step quote-then-pay flow ('nothing is charged or signed' on the first call), adding real meaning beyond the schema text.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Deliverability and trust check for an email address or domain') and immediately names the sibling it is not ('For the domain's registration age and registrar use genesis402_whois'). An agent can distinguish it from the whois and sanctions-screen siblings without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives explicit when-to-use ('vet a signup email or an inbound sender') and an explicit alternative with the condition that selects it (genesis402_whois for registration age/registrar). Nothing is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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