Identity & Enrichment · x402 · early usage

InboxGuards Email Test: Email deliverability and security report for a real email you sent

by api.inboxguardstest.com · discovered, not yet claimed by its owner · updated 2026-10-10

30d calls1

30d payers1

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

InboxGuards Email Test: Email deliverability and security report for a real email you sent. 1) POST /v1/tests (free) for a one-time address + read token. 2) Send one real email to it. 3) GET this with ?test_id= and X-Read-Token. Report: SPF, DKIM (key size, alignment), DMARC, ARC, BIMI, sending IP rDNS + SpamCop, MTA-STS/TLS-RPT, one-click unsubscribe, headers, content, 0-100 score, top fixes. Not-ready/unknown tests: 4xx, never charged.

Tags: email · deliverability · spf · dkim · dmarc · bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-10

Input example from Bazaar metadata

{
  "test_id": "abcdefgh2345"
}

Output example

{
  "authentication": {
    "dkim": [
      {
        "aligned": true,
        "domain": "example.com",
        "key_bits": 2048,
        "result": "pass",
        "selector": "s1"
      }
    ],
    "dmarc": {
      "policy": "quarantine",
      "result": "pass"
    },
    "spf": {
      "evaluated": true,
      "result": "pass"
    }
  },
  "cloudflare": {
    "accepted": true,
    "spam_score": 2
  },
  "connection": {
    "fcrdns": true,
    "helo": "mail.example.com",
    "ip": "192.0.2.10",
    "ptr": [
      "mail.example.com"
    ],
    "source": "cloudflare_received",
    "spamcop": "not_listed"
  },
  "findings": [
    {
      "area": "spf",
      "id": "spf_pass",
      "severity": "pass",
      "title": "SPF pass for example.com"
    }
  ],
  "grade": "B",
  "links": {
    "checked": [],
    "reason": "link reputation not configured",
    "status": "not_checked",
    "unchecked_domains": [
      "example.com"
    ]
  },
  "message": {
    "body_analyzed": true,
    "envelope_from": "[email protected]",
    "from_domain": "example.com",
    "size_bytes": 5321
  },
  "notes": [
    "These are deliverability signals, not a guarantee of inbox placement."
  ],
  "partial_errors": [],
  "received_at": "2026-10-10T06:48:16.999Z",
  "schema_version": "1.0",
  "score": 88,
  "suggestions": [],
  "test_id": "abcdefgh2345",
  "top_fixes": [
    {
      "fix": "Add an https unsubscribe URL plus List-Unsubscribe-Post: List-Unsubscribe=One-Click.",
      "id": "list_unsubscribe_no_one_click",
      "title": "List-Unsubscribe present but not one-click"
    }
  ],
  "transport_policy": {
    "inbound_tls_observed": false,
    "mta_sts": {
      "record": false
    },
    "tls_rpt": false
  }
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/34867.json for the price and payment options.
Pay. Call GET https://api.inboxguardstest.com/v1/report. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.05 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.05	0x2dAF658B01e257206375798a15832E9f547D65dD	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x2dAF658B01e257206375798a15832E9f547D65dD",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "50000",
    "amountUsd": 0.05,
    "maxTimeoutSeconds": 120
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "analyzed_at": {
          "format": "date-time",
          "type": "string"
        },
        "authentication": {
          "description": "SPF, DKIM (each signature: domain, selector, result, aligned, key_bits), DMARC (result, policy, alignment), ARC, BIMI",
          "properties": {
            "arc": {
              "type": "object"
            },
            "bimi": {
              "type": "object"
            },
            "dkim": {
              "type": "array"
            },
            "dmarc": {
              "type": "object"
            },
            "spf": {
              "type": "object"
            }
          },
          "type": "object"
        },
        "cloudflare": {
          "description": "Cloudflare's own Authentication-Results and spam score for the inbound hop",
          "type": "object"
        },
        "connection": {
          "description": "sending IP and HELO from Cloudflare's trace header, PTR, forward-confirmed rDNS, SpamCop",
          "properties": {
            "fcrdns": {
              "type": "boolean"
            },
            "helo": {
              "type": "string"
            },
            "ip": {
              "type": "string"
            },
            "ptr": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "source": {
              "type": "string"
            },
            "spamcop": {
              "type": "string"
            }
          },
          "type": "object"
        },
        "findings": {
          "items": {
            "properties": {
              "area": {
                "type": "string"
              },
              "detail": {
                "type": "string"
              },
              "fix": {
                "type": "string"
              },
              "id": {
                "type": "string"
              },
              "severity": {
                "enum": [
                  "pass",
                  "info",
                  "warn",
                  "fail"
                ],
                "type": "string"
              },
              "title": {
                "type": "string"
              }
            },
            "required": [
              "id",
              "area",
              "severity",
              "title"
            ],
            "type": "object"
          },
          "type": "array"
        },
        "grade": {
          "enum": [
            "A",
            "B",
            "C",
            "D",
            "F"
          ],
          "type": "string"
        },
        "links": {
          "description": "link reputation status per domain (Google Web Risk; 'not_checked' until configured)",
          "type": "object"
        },
        "message": {
          "description": "size, From/envelope domains, Message-ID domain, List-Unsubscribe, content facts (no body text)",
          "type": "object"
        },
        "notes": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "partial_errors": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "received_at": {
          "format": "date-time",
          "type": "string"
        },
        "schema_version": {
          "type": "string"
        },
        "score": {
          "maximum": 100,
          "minimum": 0,
          "type": "integer"
        },
        "suggestions": {
          "description": "Optional improvements; do not lower the score",
          "items": {
            "properties": {
              "fix": {
                "type": "string"
              },
              "id": {
                "type": "string"
              },
              "title": {
                "type": "string"
              }
            },
            "required": [
              "id",
              "title",
              "fix"
            ],
            "type": "object"
          },
          "type": "array"
        },
        "test_id": {
          "type": "string"
        },
        "top_fixes": {
          "description": "Up to 3 fail/warn items to fix first",
          "items": {
            "properties": {
              "fix": {
                "type": "string"
              },
              "id": {
                "type": "string"
              },
              "title": {
                "type": "string"
              }
            },
            "required": [
              "id",
              "title",
              "fix"
            ],
            "type": "object"
          },
          "type": "array"
        },
        "transport_policy": {
          "description": "sender domain MTA-STS and TLS-RPT records",
          "type": "object"
        }
      },
      "required": [
        "schema_version",
        "test_id",
        "received_at",
        "score",
        "grade",
        "top_fixes",
        "suggestions",
        "message",
        "connection",
        "authentication",
        "transport_policy",
        "links",
        "findings",
        "notes"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "analyzed_at": "2026-01-01T00:00:00Z",
    "authentication": {
      "arc": {},
      "bimi": {},
      "dkim": [
        "value"
      ],
      "dmarc": {},
      "spf": {}
    },
    "cloudflare": {},
    "connection": {
      "fcrdns": true,
      "helo": "string",
      "ip": "string",
      "ptr": [
        "string"
      ],
      "source": "string",
      "spamcop": "string"
    },
    "findings": [
      {
        "area": "string",
        "detail": "string",
        "fix": "string",
        "id": "string",
        "severity": "pass",
        "title": "string"
      }
    ],
    "grade": "A",
    "links": {},
    "message": {},
    "notes": [
      "string"
    ],
    "partial_errors": [
      "string"
    ],
    "received_at": "2026-01-01T00:00:00Z",
    "schema_version": "string",
    "score": 0,
    "suggestions": [
      {
        "fix": "string",
        "id": "string",
        "title": "string"
      }
    ],
    "test_id": "string",
    "top_fixes": [
      {
        "fix": "string",
        "id": "string",
        "title": "string"
      }
    ],
    "transport_policy": {}
  },
  "type": "string"
}

Examples

curl

curl "https://api.inboxguardstest.com/v1/report"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.inboxguardstest.com/v1/report");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://api.inboxguardstest.com/v1/report")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: api.inboxguardstest.com
Endpoint: https://api.inboxguardstest.com/v1/report
Machine-readable: /resources/34867.json