x402 List

x402 Protocol Service Directory

●

StableEmail

AI PAYMENT-READY

payment-ready until 2026-09-29

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.

measured since 2026-02-11 (start of our harvest window) · $1.1k all-time · settled via coinbase

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

VERDICT

ranking generation 3

solid 89/100 #8 of 144 in AI by measured score

What the score read on this service: status online, 99.9% uptime 30d, 676ms response p95, x402 compliance 14 of 14, $0.02 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside AI, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 144 listings, this one among them. That set is wider than the 144 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN AI

Other AI services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE BAND SCORE UPTIME 30D VOL 30D
Otto AI strong 95 100% $61.29
NetIntel strong 94 100% $20.76
GlianaAI solid 92 100% $87.08
Agent402.tools solid 92 99.4% $136.04
x402engine solid 92 100% $16.44
5 of 143 other ranked services in AI · see the whole category

ASSESSMENT

updated 18m ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 99.9%
uptime 24h
100%
uptime 7d
100%
uptime 30d
99.9%
uptime 90d
100%
response p95
676ms
avg response
345ms
total checks
7,230

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.02 to $5.00 (p63 in AI)
price (min)
$0.02
price (max)
$5.00
category percentile (min)
p63 in AI
category percentile (max)
p89 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.

domain age
-
registrar
-
hosting
custom
domain created
---

Identity facts, not a risk score.

traction $31.161 30d · 36 buyers
volume 30d
$31.161
buyers 30d
36
settlements 30d
1,560
measured since
2026-02-11 (start of our harvest window)
last settlement
2026-09-22
top buyer share
33% of 30d volume
trend 7d vs 30d
1.08x the 30d daily rate
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$1.1k
settlements all-time
33,931
median settlement 30d
$0.001
max settlement 30d
$5.00
settled via
coinbase ($31.16, 1,560 tx)

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.

CHANGES

10 in 30d

Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.

changes schema changed 40m ago (10 in 30d)

schema changed · 40m ago

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schema changed · 4h ago

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schema changed · 7h ago

schema removed POST /api/inbox/buy exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww","lastValidBlockHeight":"427244680","recentBlockhash":"Hqa8WBAcesEKRV4CRTWHTyeHkwnj23r5bEZw8vMdMFHk"}

schema removed POST /api/send exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww","lastValidBlockHeight":"427244680","recentBlockhash":"Hqa8WBAcesEKRV4CRTWHTyeHkwnj23r5bEZw8vMdMFHk"}

schema removed POST /api/subdomain/buy exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww","lastValidBlockHeight":"427244680","recentBlockhash":"Hqa8WBAcesEKRV4CRTWHTyeHkwnj23r5bEZw8vMdMFHk"}

schema added POST /api/inbox/buy exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww","lastValidBlockHeight":"427258594","recentBlockhash":"FaymgfVHnRbw8zLVHrC7owkcJDcTXUbxxdqHVrzvj5R6"}

schema added POST /api/send exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww","lastValidBlockHeight":"427258594","recentBlockhash":"FaymgfVHnRbw8zLVHrC7owkcJDcTXUbxxdqHVrzvj5R6"}

schema added POST /api/subdomain/buy exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww","lastValidBlockHeight":"427258594","recentBlockhash":"FaymgfVHnRbw8zLVHrC7owkcJDcTXUbxxdqHVrzvj5R6"}

see all changes for this service

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET 402 CHANNEL
POST /api/inbox/buy Buy a managed inbox $1.00 Base/Solana USDC header
POST /api/send Send email $0.02 Base/Solana USDC header
POST /api/subdomain/buy Buy a subdomain $5.00 Base/Solana USDC header
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": "20000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
          "recentBlockhash": "AKAufF8rdQJpKSi9xkmn2Pq1AYCK7mKvTKwS6117xqoD",
          "lastValidBlockHeight": "427354526"
        },
        "payTo": "HvBMG7ezcwDssxXP7DPJJsveyDnvUm2wNySBR5WF2XEY",
        "amount": "20000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://stableemail.dev/api/send",
      "tags": [
        "Send"
      ],
      "method": "POST",
      "mimeType": "application/json",
      "description": "Send an email from \"StableEmail\" <[email protected]> ($0.02)",
      "serviceName": "StableEmail"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {},
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          }
        },
        "schema": {
          "type": "object",
          "$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": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
          "recentBlockhash": "AKAufF8rdQJpKSi9xkmn2Pq1AYCK7mKvTKwS6117xqoD",
          "lastValidBlockHeight": "427354526"
        },
        "payTo": "HvBMG7ezcwDssxXP7DPJJsveyDnvUm2wNySBR5WF2XEY",
        "amount": "5000000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://stableemail.dev/api/subdomain/buy",
      "tags": [
        "Subdomain"
      ],
      "method": "POST",
      "mimeType": "application/json",
      "description": "Purchase a custom email subdomain on stableemail.dev ($5)",
      "serviceName": "StableEmail"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "subdomain": "my-brand"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          }
        },
        "schema": {
          "type": "object",
          "$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
  },
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xdb5aa553feeb2c3e3d03e8360b36fb0f7e480671",
        "amount": "1000000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
          "recentBlockhash": "AKAufF8rdQJpKSi9xkmn2Pq1AYCK7mKvTKwS6117xqoD",
          "lastValidBlockHeight": "427354526"
        },
        "payTo": "HvBMG7ezcwDssxXP7DPJJsveyDnvUm2wNySBR5WF2XEY",
        "amount": "1000000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://stableemail.dev/api/inbox/buy",
      "tags": [
        "Inbox"
      ],
      "method": "POST",
      "mimeType": "application/json",
      "description": "Buy an inbox on stableemail.dev ($1, 30 days). forwardTo is optional — omit it to use as a programmatic mailbox via the messages API (retainMessages enabled automatically). Message content and attachments are retained for 90 days.",
      "serviceName": "StableEmail"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "username": "my-inbox"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          }
        },
        "schema": {
          "type": "object",
          "$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
  }
]

OVER TIME

All charts use the 90d selector; each series spans only the dates it has data for. 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). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME
06-25 · uptime 100.0% · 562ms avg06-26 · uptime 100.0% · 588ms avg06-27 · uptime 100.0% · 492ms avg06-28 · uptime 100.0% · 342ms avg06-29 · uptime 100.0% · 352ms avg06-30 · uptime 100.0% · 395ms avg07-01 · uptime 100.0% · 385ms avg07-02 · uptime 100.0% · 376ms avg07-03 · uptime 100.0% · 296ms avg07-04 · uptime 100.0% · 293ms avg07-05 · uptime 100.0% · 294ms avg07-06 · uptime 100.0% · 296ms avg07-07 · uptime 100.0% · 308ms avg07-08 · uptime 100.0% · 302ms avg07-09 · uptime 100.0% · 328ms avg07-10 · uptime 100.0% · 292ms avg07-11 · uptime 100.0% · 278ms avg07-12 · uptime 100.0% · 304ms avg07-13 · uptime 100.0% · 282ms avg07-14 · uptime 100.0% · 296ms avg07-15 · uptime 100.0% · 303ms avg07-16 · uptime 100.0% · 296ms avg07-17 · uptime 100.0% · 273ms avg07-18 · uptime 100.0% · 235ms avg07-19 · uptime 100.0% · 237ms avg07-20 · uptime 100.0% · 223ms avg07-21 · uptime 100.0% · 228ms avg07-22 · uptime 100.0% · 208ms avg07-23 · uptime 100.0% · 224ms avg07-24 · uptime 100.0% · 234ms avg07-25 · uptime 100.0% · 263ms avg07-26 · uptime 100.0% · 234ms avg07-27 · uptime 100.0% · 229ms avg07-28 · uptime 100.0% · 245ms avg07-29 · uptime 100.0% · 260ms avg07-30 · uptime 100.0% · 262ms avg07-31 · uptime 100.0% · 272ms avg08-01 · uptime 100.0% · 276ms avg08-02 · uptime 100.0% · 290ms avg08-03 · uptime 100.0% · 312ms avg08-04 · uptime 100.0% · 279ms avg08-05 · uptime 100.0% · 363ms avg08-06 · uptime 100.0% · 283ms avg08-07 · uptime 100.0% · 276ms avg08-08 · uptime 100.0% · 298ms avg08-09 · uptime 100.0% · 374ms avg08-10 · uptime 100.0% · 289ms avg08-11 · uptime 100.0% · 286ms avg08-12 · uptime 100.0% · 257ms avg08-13 · uptime 100.0% · 279ms avg08-14 · uptime 100.0% · 225ms avg08-15 · uptime 100.0% · 301ms avg08-16 · uptime 100.0% · 308ms avg08-17 · uptime 100.0% · 304ms avg08-18 · uptime 100.0% · 350ms avg08-19 · uptime 100.0% · 299ms avg08-20 · uptime 100.0% · 281ms avg08-21 · uptime 100.0% · 254ms avg08-22 · uptime 100.0% · 268ms avg08-23 · uptime 100.0% · 281ms avg08-24 · uptime 100.0% · 309ms avg08-25 · uptime 100.0% · 403ms avg08-26 · uptime 100.0% · 418ms avg08-27 · uptime 100.0% · 396ms avg08-28 · uptime 100.0% · 376ms avg08-29 · uptime 100.0% · 457ms avg08-30 · uptime 100.0% · 386ms avg08-31 · uptime 100.0% · 346ms avg09-01 · uptime 100.0% · 352ms avg09-02 · uptime 100.0% · 351ms avg09-03 · uptime 100.0% · 417ms avg09-04 · uptime 100.0% · 343ms avg09-05 · uptime 100.0% · 449ms avg09-06 · uptime 100.0% · 406ms avg09-07 · uptime 100.0% · 317ms avg09-08 · uptime 100.0% · 313ms avg09-09 · uptime 100.0% · 289ms avg09-10 · uptime 100.0% · 332ms avg09-11 · uptime 100.0% · 292ms avg09-12 · uptime 100.0% · 322ms avg09-13 · uptime 99.2% · 282ms avg09-14 · uptime 98.7% · 275ms avg09-15 · uptime 100.0% · 330ms avg09-16 · uptime 100.0% · 309ms avg09-17 · uptime 100.0% · 342ms avg09-18 · uptime 100.0% · 299ms avg09-19 · uptime 100.0% · 303ms avg09-20 · uptime 100.0% · 313ms avg09-21 · uptime 100.0% · 326ms avg09-22 · uptime 100.0% · 400ms avg06-2509-22
90d UPTIME 100%
RESPONSE TIME
06-25 · 562ms avg06-25 · 562ms avg06-26 · 588ms avg06-26 · 588ms avg06-27 · 492ms avg06-27 · 492ms avg06-28 · 342ms avg06-28 · 342ms avg06-29 · 352ms avg06-29 · 352ms avg06-30 · 395ms avg06-30 · 395ms avg07-01 · 385ms avg07-01 · 385ms avg07-02 · 376ms avg07-02 · 376ms avg07-03 · 296ms avg07-03 · 296ms avg07-04 · 293ms avg07-04 · 293ms avg07-05 · 294ms avg07-05 · 294ms avg07-06 · 296ms avg07-06 · 296ms avg07-07 · 308ms avg07-07 · 308ms avg07-08 · 302ms avg07-08 · 302ms avg07-09 · 328ms avg07-09 · 328ms avg07-10 · 292ms avg07-10 · 292ms avg07-11 · 278ms avg07-11 · 278ms avg07-12 · 304ms avg07-12 · 304ms avg07-13 · 282ms avg07-13 · 282ms avg07-14 · 296ms avg07-14 · 296ms avg07-15 · 303ms avg07-15 · 303ms avg07-16 · 296ms avg07-16 · 296ms avg07-17 · 273ms avg07-17 · 273ms avg07-18 · 235ms avg07-18 · 235ms avg07-19 · 237ms avg07-19 · 237ms avg07-20 · 223ms avg07-20 · 223ms avg07-21 · 228ms avg07-21 · 228ms avg07-22 · 208ms avg07-22 · 208ms avg07-23 · 224ms avg07-23 · 224ms avg07-24 · 234ms avg07-24 · 234ms avg07-25 · 263ms avg07-25 · 263ms avg07-26 · 234ms avg07-26 · 234ms avg07-27 · 229ms avg07-27 · 229ms avg07-28 · 245ms avg07-28 · 245ms avg07-29 · 260ms avg07-29 · 260ms avg07-30 · 262ms avg07-30 · 262ms avg07-31 · 272ms avg07-31 · 272ms avg08-01 · 276ms avg08-01 · 276ms avg08-02 · 290ms avg08-02 · 290ms avg08-03 · 312ms avg08-03 · 312ms avg08-04 · 279ms avg08-04 · 279ms avg08-05 · 363ms avg08-05 · 363ms avg08-06 · 283ms avg08-06 · 283ms avg08-07 · 276ms avg08-07 · 276ms avg08-08 · 298ms avg08-08 · 298ms avg08-09 · 374ms avg08-09 · 374ms avg08-10 · 289ms avg08-10 · 289ms avg08-11 · 286ms avg08-11 · 286ms avg08-12 · 257ms avg08-12 · 257ms avg08-13 · 279ms avg08-13 · 279ms avg08-14 · 225ms avg08-14 · 225ms avg08-15 · 301ms avg08-15 · 301ms avg08-16 · 308ms avg08-16 · 308ms avg08-17 · 304ms avg08-17 · 304ms avg08-18 · 350ms avg08-18 · 350ms avg08-19 · 299ms avg08-19 · 299ms avg08-20 · 281ms avg08-20 · 281ms avg08-21 · 254ms avg08-21 · 254ms avg08-22 · 268ms avg08-22 · 268ms avg08-23 · 281ms avg08-23 · 281ms avg08-24 · 309ms avg08-24 · 309ms avg08-25 · 403ms avg08-25 · 403ms avg08-26 · 418ms avg08-26 · 418ms avg08-27 · 396ms avg08-27 · 396ms avg08-28 · 376ms avg08-28 · 376ms avg08-29 · 457ms avg08-29 · 457ms avg08-30 · 386ms avg08-30 · 386ms avg08-31 · 346ms avg08-31 · 346ms avg09-01 · 352ms avg09-01 · 352ms avg09-02 · 351ms avg09-02 · 351ms avg09-03 · 417ms avg09-03 · 417ms avg09-04 · 343ms avg09-04 · 343ms avg09-05 · 449ms avg09-05 · 449ms avg09-06 · 406ms avg09-06 · 406ms avg09-07 · 317ms avg09-07 · 317ms avg09-08 · 313ms avg09-08 · 313ms avg09-09 · 289ms avg09-09 · 289ms avg09-10 · 332ms avg09-10 · 332ms avg09-11 · 292ms avg09-11 · 292ms avg09-12 · 322ms avg09-12 · 322ms avg09-13 · 282ms avg09-13 · 282ms avg09-14 · 275ms avg09-14 · 275ms avg09-15 · 330ms avg09-15 · 330ms avg09-16 · 309ms avg09-16 · 309ms avg09-17 · 342ms avg09-17 · 342ms avg09-18 · 299ms avg09-18 · 299ms avg09-19 · 303ms avg09-19 · 303ms avg09-20 · 313ms avg09-20 · 313ms avg09-21 · 326ms avg09-21 · 326ms avg09-22 · 400ms avg09-22 · 400ms avg06-2509-22
AVG RESP 345ms
PRICE (captured 402, USD)
06-24 · $1.0006-27 · $1.0007-06 · $1.0009-22 · $1.00$1.0006-2409-22

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

SUB-SCORES (uptime + x402 compliance)
07-13 uptime: 100.0% compliance: 92% checks07-14 uptime: 100.0% compliance: 92% checks07-15 uptime: 100.0% compliance: 92% checks07-16 uptime: 100.0% compliance: 92% checks07-17 uptime: 100.0% compliance: 100% checks07-18 uptime: 100.0% compliance: 100% checks07-19 uptime: 100.0% compliance: 100% checks07-20 uptime: 100.0% compliance: 100% checks07-21 uptime: 100.0% compliance: 100% checks07-22 uptime: 100.0% compliance: 100% checks07-23 uptime: 100.0% compliance: 100% checks07-24 uptime: 100.0% compliance: 100% checks07-25 uptime: 100.0% compliance: 100% checks07-26 uptime: 100.0% compliance: 100% checks07-27 uptime: 100.0% compliance: 100% checks07-28 uptime: 100.0% compliance: 100% checks07-29 uptime: 100.0% compliance: 100% checks07-30 uptime: 100.0% compliance: 100% checks07-31 uptime: 100.0% compliance: 100% checks08-01 uptime: 100.0% compliance: 100% checks08-02 uptime: 100.0% compliance: 100% checks08-03 uptime: 100.0% compliance: 100% checks08-04 uptime: 100.0% compliance: 100% checks08-05 uptime: 100.0% compliance: 100% checks08-06 uptime: 100.0% compliance: 100% checks08-07 uptime: 100.0% compliance: 100% checks08-08 uptime: 100.0% compliance: 100% checks08-09 uptime: 100.0% compliance: 100% checks08-10 uptime: 100.0% compliance: 100% checks08-11 uptime: 100.0% compliance: 100% checks08-12 uptime: 100.0% compliance: 100% checks08-13 uptime: 100.0% compliance: 100% checks08-14 uptime: 100.0% compliance: 100% checks08-15 uptime: 100.0% compliance: 100% checks08-16 uptime: 100.0% compliance: 100% checks08-17 uptime: 100.0% compliance: 100% checks08-18 uptime: 100.0% compliance: 100% checks08-19 uptime: 100.0% compliance: 100% checks08-20 uptime: 100.0% compliance: 100% checks08-21 uptime: 100.0% compliance: 100% checks08-22 uptime: 100.0% compliance: 100% checks08-23 uptime: 100.0% compliance: 100% checks08-24 uptime: 100.0% compliance: 100% checks08-25 uptime: 100.0% compliance: 100% checks08-26 uptime: 100.0% compliance: 100% checks08-27 uptime: 100.0% compliance: 100% checks08-28 uptime: 100.0% compliance: 100% checks08-29 uptime: 100.0% compliance: 100% checks08-30 uptime: 100.0% compliance: 100% checks08-31 uptime: 100.0% compliance: 100% checks09-01 uptime: 100.0% compliance: 100% checks09-02 uptime: 100.0% compliance: 100% checks09-03 uptime: 100.0% compliance: 100% checks09-04 uptime: 100.0% compliance: 100% checks09-05 uptime: 100.0% compliance: 100% checks09-06 uptime: 100.0% compliance: 100% checks09-07 uptime: 100.0% compliance: 100% checks09-08 uptime: 100.0% compliance: 100% checks09-09 uptime: 100.0% compliance: 100% checks09-10 uptime: 100.0% compliance: 100% checks09-11 uptime: 100.0% compliance: 100% checks09-12 uptime: 100.0% compliance: 100% checks09-13 uptime: 100.0% compliance: 100% checks09-14 uptime: 99.9% compliance: 100% checks09-15 uptime: 99.9% compliance: 100% checks09-16 uptime: 99.9% compliance: 100% checks09-17 uptime: 99.9% compliance: 100% checks09-18 uptime: 99.9% compliance: 100% checks09-19 uptime: 99.9% compliance: 100% checks09-20 uptime: 99.9% compliance: 100% checks09-21 uptime: 99.9% compliance: 100% checks09-22 uptime: 99.9% compliance: 100% checksuptimecompliance07-1309-22

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)
price percentile in AI
site signals present (of 6)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)
06-25 · $0.4406-26 · $206-27 · $106-28 · $0.0606-29 · $0.5106-30 · $107-01 · $107-02 · $507-03 · $0.1507-04 · $0.0907-05 · $0.1107-06 · $0.1007-07 · $0.1607-08 · $0.3407-09 · $0.2607-10 · $0.1407-11 · $0.1207-12 · $807-13 · $107-14 · $0.2007-15 · $0.3107-16 · $0.1807-17 · $0.5007-18 · $107-19 · $0.1307-20 · $107-21 · $0.7007-22 · $0.2507-23 · $107-24 · $0.4407-25 · $0.1107-26 · $107-27 · $0.1407-28 · $0.1607-29 · $407-30 · $0.1907-31 · $0.2108-01 · $0.3808-02 · $108-03 · $0.1908-04 · $0.2508-05 · $0.3808-06 · $108-07 · $0.4708-08 · $0.5608-09 · $0.2208-10 · $0.2608-11 · $0.3608-12 · $108-13 · $208-14 · $608-15 · $0.2408-16 · $0.2808-17 · $0.2808-18 · $0.2008-19 · $0.4208-20 · $0.3808-21 · $208-22 · $0.6608-23 · $108-24 · $0.5008-25 · $1108-26 · $0.3208-27 · $0.1608-28 · $0.1408-29 · $108-30 · $0.1408-31 · $0.2409-01 · $0.2009-02 · $109-03 · $0.2009-04 · $0.2009-05 · $0.3809-06 · $209-07 · $0.4609-08 · $209-09 · $0.7909-10 · $0.4409-11 · $0.5209-12 · $0.3209-13 · $109-14 · $0.1609-15 · $0.1209-16 · $0.1809-17 · $0.1209-18 · $0.1009-19 · $109-20 · $0.4609-21 · $509-22 · $1peak $1106-2509-22
DISTINCT BUYERS
06-25 · 8 buyers06-26 · 8 buyers06-27 · 6 buyers06-28 · 2 buyers06-29 · 7 buyers06-30 · 12 buyers07-01 · 8 buyers07-02 · 5 buyers07-03 · 7 buyers07-04 · 4 buyers07-05 · 5 buyers07-06 · 4 buyers07-07 · 4 buyers07-08 · 6 buyers07-09 · 9 buyers07-10 · 5 buyers07-11 · 4 buyers07-12 · 5 buyers07-13 · 5 buyers07-14 · 7 buyers07-15 · 8 buyers07-16 · 6 buyers07-17 · 12 buyers07-18 · 8 buyers07-19 · 6 buyers07-20 · 9 buyers07-21 · 11 buyers07-22 · 5 buyers07-23 · 9 buyers07-24 · 8 buyers07-25 · 4 buyers07-26 · 7 buyers07-27 · 5 buyers07-28 · 7 buyers07-29 · 9 buyers07-30 · 5 buyers07-31 · 9 buyers08-01 · 9 buyers08-02 · 5 buyers08-03 · 5 buyers08-04 · 6 buyers08-05 · 4 buyers08-06 · 9 buyers08-07 · 5 buyers08-08 · 6 buyers08-09 · 4 buyers08-10 · 4 buyers08-11 · 4 buyers08-12 · 6 buyers08-13 · 10 buyers08-14 · 5 buyers08-15 · 4 buyers08-16 · 5 buyers08-17 · 6 buyers08-18 · 5 buyers08-19 · 7 buyers08-20 · 7 buyers08-21 · 8 buyers08-22 · 5 buyers08-23 · 7 buyers08-24 · 6 buyers08-25 · 6 buyers08-26 · 6 buyers08-27 · 6 buyers08-28 · 4 buyers08-29 · 5 buyers08-30 · 3 buyers08-31 · 4 buyers09-01 · 6 buyers09-02 · 7 buyers09-03 · 5 buyers09-04 · 4 buyers09-05 · 4 buyers09-06 · 6 buyers09-07 · 5 buyers09-08 · 6 buyers09-09 · 9 buyers09-10 · 7 buyers09-11 · 6 buyers09-12 · 4 buyers09-13 · 4 buyers09-14 · 4 buyers09-15 · 4 buyers09-16 · 3 buyers09-17 · 5 buyers09-18 · 2 buyers09-19 · 6 buyers09-20 · 4 buyers09-21 · 4 buyers09-22 · 2 buyerspeak 12 buyers06-2509-22

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-09-22 · last up 2026-09-22

  • 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
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (18) live · click to expand
TIME STATUS RESP CAUSE
● OK 260ms
● SLOW 530ms
● OK 357ms
● OK 159ms
● OK 201ms
● OK 454ms
● SLOW 559ms
● SLOW 714ms
● SLOW 630ms
● OK 309ms
● OK 331ms
● OK 314ms
● OK 437ms
● OK 149ms
● SLOW 567ms
● SLOW 674ms
● OK 344ms
● OK 389ms
18 of 7,233 checks · live count

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.

StableEmail listed on x402-list
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>

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