payment-ready until 2026-08-20
API-first email inboxes for AI agents. Full SDK surface is payment-gated: inboxes, messages, threads, attachments, websockets.
Pay from $2.00 in USDC on Avalanche / Base / Polygon / Solana, settled onchain via the x402 protocol, no signup, no API key needed.
first settlement 2026-01-30 · $678.35 all-time · settled via payAI, coinbase
ASSESSMENT
updated 3h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 99.9%
- uptime 24h
- 98.3%
- uptime 7d
- 99.8%
- uptime 30d
- 99.9%
- uptime 90d
- 99.9%
- response p95
- 1385ms
- avg response
- 887ms
- total checks
- 7,304
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.
price $2.00 (p92 in AI)
- price (min)
- $2.00
- category percentile (min)
- p92 in AI
- endpoints / prices
- 1 / 1
- model
- flat
- 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
- 593d
- registrar
- NAMECHEAP
- hosting
- custom
- domain created
- 2024-12-25
Identity facts, not a risk score.
traction $50.39 30d · 14 buyers
- volume 30d
- $50.39
- buyers 30d
- 14
- settlements 30d
- 259
- first settlement
- 2026-01-30
- last settlement
- 2026-08-13
- top buyer share
- 24% of 30d volume
- trend 7d vs 30d
- 1.58x the 30d daily rate
- networks
- eip155:137, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
- volume all-time
- $678.35
- settlements all-time
- 2,391
- median settlement 30d
- $0.01
- max settlement 30d
- $10.00
- settled via
- payAI ($48.39, 258 tx), coinbase ($2.00, 1 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.
WHAT IT DOES
ai-derivedProvides email inbox management services with API endpoints for creating, listing, and managing inboxes, pods, drafts, domains, and webhooks.
- category
- email-api
- in
- body
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| POST | /v0/inboxes | Create an inbox | $2.00 | Avalanche/Base/Polygon/Solana | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to POST /v0/inboxes returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i -X POST 'https://x402.api.agentmail.to/v0/inboxes'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x6e3184C204e596dED89E8A5693B602097F4Ab687",
"amount": "2000000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "2wKupLR9q6wXYppw8Gr2NvWxKBUqm4PPJKkQfoxHDBg4"
},
"payTo": "7r4e5dwNS68MDaxbw7N8jbzHq7RCMBp9z6smHFH4NXWw",
"amount": "2000000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 300
},
{
"asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x6e3184C204e596dED89E8A5693B602097F4Ab687",
"amount": "2000000",
"scheme": "exact",
"network": "eip155:43114",
"maxTimeoutSeconds": 300
},
{
"asset": "0x74b7f16337b8972027f6196a17a631ac6de26d22",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x6e3184C204e596dED89E8A5693B602097F4Ab687",
"amount": "2000000",
"scheme": "exact",
"network": "eip155:196",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x6e3184C204e596dED89E8A5693B602097F4Ab687",
"amount": "2000000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.paysponge.com/v0/inboxes",
"mimeType": "application/json",
"description": "Service: AgentMail API (https://api.paysponge.com/v0/inboxes)"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"domain": "<domain>",
"username": "<username>",
"client_id": "<client_id>",
"display_name": "<display_name>"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {}
}
},
"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",
"title": "CreateInboxRequest",
"properties": {
"domain": {
"type": "string",
"description": "Domain of address. Must be verified domain. Defaults to `agentmail.to`."
},
"username": {
"type": "string",
"description": "Username of address. Randomly generated if not specified."
},
"client_id": {
"type": "string",
"title": "ClientId",
"description": "Client ID of inbox."
},
"display_name": {
"type": "string",
"title": "DisplayName",
"description": "Display name: `Display Name <[email protected]>`."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"additionalProperties": true
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/agentmail/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.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
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.
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-07-20 · last up 2026-08-13
- 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
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