●

StableEmail

AI ✓ VERIFIED

verified until 2026-07-27

Pay-per-send email via micropayments. AWS SES backend. Supports subdomains, inboxes, and replies. USDC on Base or Solana.

Pay from $0.02 to $5.00 in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

UPTIME 24H 100% │ 7D 100% │ 30D 100%

BASE URL https://stableemail.dev │ ENDPOINTS 3 │ NETWORK Base / Solana │ ASSET USDC │ MEMBER SINCE 2026-02-05 │ MONITORED SINCE 2026-04-15

ASSESSMENT

updated 1h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%

uptime 24h: 100%
uptime 7d: 100%
uptime 30d: 100%
uptime 90d: 100%
response p95: 414ms
avg response: 360ms
total checks: 7,232

compliance A (11/11)

11 of 11 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.02 to $5.00 (p70 in AI)

price (min): $0.02
price (max): $5.00
category percentile (min): p70 in AI
category percentile (max): p85 in AI
endpoints / prices: 3 / 3
model: tiered
stability: 100%

risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

traction $26.15 30d · 64 buyers

volume 30d: $26.15
buyers 30d: 64
settlements 30d: 520
last settlement: 2026-07-20
top buyer share: 33% of 30d volume
trend 7d vs 30d: 0.47x the 30d daily rate
networks: eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

StableEmail provides email delivery services with managed inboxes, subdomain purchases, and email sending capabilities.

category: email-service
in: body
auth: none

emaildeliveryinbox-managementsubdomain

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD	PATH	DESCRIPTION	PRICE	NETWORK	ASSET
POST	/api/inbox/buy	Buy a managed inbox	$1.00	Base/Solana	USDC
POST	/api/send	Send email	$0.02	Base/Solana	USDC
POST	/api/subdomain/buy	Buy a subdomain	$5.00	Base/Solana	USDC

3 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to POST /api/inbox/buy returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request

curl -i -X POST 'https://stableemail.dev/api/inbox/buy'

// 402 response (captured by monitor) · 3 payloads · click to expand

[
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xdb5aa553feeb2c3e3d03e8360b36fb0f7e480671",
        "amount": "1000000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "2wKupLR9q6wXYppw8Gr2NvWxKBUqm4PPJKkQfoxHDBg4"
        },
        "payTo": "HvBMG7ezcwDssxXP7DPJJsveyDnvUm2wNySBR5WF2XEY",
        "amount": "1000000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://stableemail.dev/api/inbox/buy",
      "method": "POST",
      "mimeType": "application/json",
      "description": "Buy an inbox on stableemail.dev ($1, 30 days). forwardTo is optional — omit it to use as a programmatic mailbox via the messages API (retainMessages enabled automatically). Message content and attachments are retained for 90 days."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "username": "my-inbox"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "type": "object",
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "required": [
                    "username"
                  ],
                  "properties": {
                    "username": {
                      "type": "string",
                      "allOf": [
                        {
                          "pattern": "^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$"
                        },
                        {
                          "pattern": "^(?!.*--)"
                        }
                      ]
                    },
                    "forwardTo": {
                      "type": "string",
                      "format": "email",
                      "pattern": "^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
                    }
                  },
                  "additionalProperties": false
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xdb5aa553feeb2c3e3d03e8360b36fb0f7e480671",
        "amount": "20000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "2wKupLR9q6wXYppw8Gr2NvWxKBUqm4PPJKkQfoxHDBg4"
        },
        "payTo": "HvBMG7ezcwDssxXP7DPJJsveyDnvUm2wNySBR5WF2XEY",
        "amount": "20000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://stableemail.dev/api/send",
      "method": "POST",
      "mimeType": "application/json",
      "description": "Send an email from \"StableEmail\" <[email protected]> ($0.02)"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {},
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "type": "object",
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "required": [
                    "to",
                    "subject"
                  ],
                  "properties": {
                    "cc": {
                      "type": "array",
                      "items": {
                        "type": "string",
                        "format": "email",
                        "pattern": "^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
                      },
                      "maxItems": 50,
                      "minItems": 1
                    },
                    "to": {
                      "type": "array",
                      "items": {
                        "type": "string",
                        "format": "email",
                        "pattern": "^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
                      },
                      "maxItems": 50,
                      "minItems": 1
                    },
                    "html": {
                      "type": "string",
                      "maxLength": 256000
                    },
                    "text": {
                      "type": "string",
                      "maxLength": 256000
                    },
                    "replyTo": {
                      "type": "string",
                      "format": "email",
                      "pattern": "^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
                    },
                    "subject": {
                      "type": "string",
                      "maxLength": 998,
                      "minLength": 1
                    },
                    "attachments": {
                      "type": "array",
                      "items": {
                        "type": "object",
                        "required": [
                          "content",
                          "contentType",
                          "filename"
                        ],
                        "properties": {
                          "content": {
                            "type": "string",
                            "maxLength": 5000000
                          },
                          "filename": {
                            "type": "string",
                            "maxLength": 255,
                            "minLength": 1
                          },
                          "contentType": {
                            "type": "string",
                            "maxLength": 255,
                            "minLength": 1
                          }
                        },
                        "additionalProperties": false
                      },
                      "maxItems": 5
                    }
                  },
                  "additionalProperties": false
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xdb5aa553feeb2c3e3d03e8360b36fb0f7e480671",
        "amount": "5000000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "2wKupLR9q6wXYppw8Gr2NvWxKBUqm4PPJKkQfoxHDBg4"
        },
        "payTo": "HvBMG7ezcwDssxXP7DPJJsveyDnvUm2wNySBR5WF2XEY",
        "amount": "5000000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://stableemail.dev/api/subdomain/buy",
      "method": "POST",
      "mimeType": "application/json",
      "description": "Purchase a custom email subdomain on stableemail.dev ($5)"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "subdomain": "my-brand"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "type": "object",
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "required": [
                    "subdomain"
                  ],
                  "properties": {
                    "subdomain": {
                      "type": "string",
                      "allOf": [
                        {
                          "pattern": "^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$"
                        },
                        {
                          "pattern": "^(?!.*--)"
                        }
                      ]
                    }
                  },
                  "additionalProperties": false
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  }
]

UPTIME

RESPONSE TIME

30d UPTIME 100%

UPTIME 30D 100%

AVG RESP 359ms

TOTAL CHECKS 7,244

RECENT CHECKS

TIME STATUS RESP

14:11:01 UTC ● OK 189ms

14:05:01 UTC ● OK 276ms

13:59:00 UTC ● OK 208ms

13:53:01 UTC ● OK 200ms

13:47:02 UTC ● OK 148ms

13:41:01 UTC ● OK 171ms

13:35:00 UTC ● OK 186ms

13:29:00 UTC ● OK 196ms

13:23:01 UTC ● OK 143ms

13:17:01 UTC ● OK 429ms

13:11:01 UTC ● OK 270ms

13:05:01 UTC ● OK 241ms

12:59:01 UTC ● OK 180ms

12:53:01 UTC ● OK 207ms

12:47:01 UTC ● OK 295ms

12:41:01 UTC ● OK 268ms

12:35:01 UTC ● OK 237ms

12:29:01 UTC ● OK 307ms

OVER TIME

All charts share the 30d window selected here. Every series is also served as JSON at /api/v1/services/stableemail/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted).

PRICE (captured 402, USD)

Median across 3 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)

VOLUME (on-chain settlement, USD)

DISTINCT BUYERS

COMPLIANCE

11/11 checks pass · grade A

402 payload captured
accepts[] array present
payTo address recoverable
payTo at accepts[0].payTo (conformant shape)
payTo is a valid on-chain address
atomic price declared
atomic price in a sane range
asset (token) address declared
network resolves to CAIP-2
payment scheme declared
served over HTTPS

EMBED THIS BADGE

Show that StableEmail is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

status

StableEmail uptime on x402-list — live uptime

// HTML

<a href="https://x402-list.com/services/stableemail?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/stableemail.svg" alt="StableEmail listed on x402-list" height="28">
</a>

// Markdown

[![StableEmail on x402-list](https://x402-list.com/badge/stableemail.svg)](https://x402-list.com/services/stableemail?utm_source=badge&utm_medium=referral&utm_campaign=embed)

// HTML · live uptime variant

<a href="https://x402-list.com/services/stableemail?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/stableemail.svg?data=uptime" alt="StableEmail uptime on x402-list" height="28">
</a>

RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

[ update this listing ]