sigtap - Email deliverability check: SPF, DKIM, DMARC and MX record audit for a sending domain
https://sigtap-outreach-api.sigtap.workers.dev/deliverabilityOverview
x402 USDC on Base - no signup, the wallet is the account. Free check: GET https://sigtap-outreach-api.sigtap.workers.dev/preview/deliverability returns a 200 sample. Paid call in 3 steps: GET https://sigtap-outreach-api.sigtap.workers.dev/deliverability -> 402 challenge (payTo+amount) -> sign and retry with the X-PAYMENT header (@x402/fetch does this) -> 200 + settled on-chain. Catalog + MCP twin: GET /llms.txt on this origin.
Protocol
x402
Price
$0.0030
Payment Asset
USDC
Payment Network
Base
Category
email-marketing
Provider
sigtap
Source
self-registered
Indexed
2026-09-05 12:51:36
Health
Status
healthy
Latency (p50)
816ms
Uptime (30d)
100.0%
Reliability Score
90/100
Last Checked
2026-09-13 14:00:34
Last Healthy
2026-09-13 14:00:34
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Recent Health Checks
| Time | Status | HTTP | Latency | Error |
|---|---|---|---|---|
| 2026-09-13 14:00:34 | healthy | 402 | 609ms | |
| 2026-09-13 02:07:39 | healthy | 402 | 662ms | |
| 2026-09-12 12:26:30 | healthy | 402 | 1322ms | |
| 2026-09-12 04:26:28 | healthy | 402 | 622ms | |
| 2026-09-11 07:50:57 | healthy | 402 | 6053ms | |
| 2026-09-11 01:22:45 | healthy | 402 | 898ms | |
| 2026-09-10 14:38:11 | healthy | 402 | 816ms |