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📊 Intel view 📋 Audit JSON 🔄 Changelog
22
💰 Paid API other

x402-signature-service

signx402.com · signx402.com

Send one PDF to one email recipient for simple electronic signature. The service emails the signer, tracks completion, and returns the completed signed PDF. Gives AI agents the missing capability to get human sign-off on contracts and NDAs: pay $0.50 USDC per request (x402 exact scheme on Base), poll a status URL with a one-time bearer token, download the signed document. SSRF-guarded document fetching, tokens stored as hashes, emails masked in logs.

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Verify the domain signx402.com via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.
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Compare public evidence

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Trust score
22/100
grade F · 3 of 9 criteria apply
Uptime
not graded
catalogue listing · no agent card to probe
Observed inflow · 30d
—
no payment wallet declared
Invocations · 7d
0
no calls observed
Listing drift · 7d
stable
0 snapshots tracked
Owner
unverified
claim this listing →

Dispute or improve this rating

F
Conformance score: 22/100
Catalogue listing, not an A2A agent: a paid API listed by x402_list. Scored on the 3 criteria that apply (9 of 40 points, scaled to 100); the A2A card criteria do not apply.
click to expand breakdown click to collapse breakdown
n/a Agent card n/a
Not applicable: a paid API listed by x402_list. The host serves no A2A agent card at /.well-known/agent-card.json, so the card criteria are not scored.
fail Live endpoint 0/25
No response from the host observed: listed by x402_list only, not confirmed by our own probe.
n/a Protocol version n/a
Not applicable: no A2A agent card served.
n/a JWS signature n/a
Not applicable: no A2A agent card served.
n/a Uptime track record n/a
Not applicable: our probes looked for an A2A agent card, which this host does not serve. That says nothing about the API's availability, so it is not graded.
n/a Skill declaration n/a
Not applicable: no A2A agent card served.
partial Verified Identity 5/10
Provider declared: signx402.com (https://signx402.com). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.
How to earn +5 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs
pass Freshness + modern flags 4/5
seen in upstream source within 0d
n/a Security declaration n/a
Not applicable: no A2A agent card served.

Activity (audit trail)

last 24h · 0 invocations Public aggregate · no PII recorded

Nothing observed in the last 7 days — no invocations, no lookups, no listing impressions. Use the try-it console above to invoke this agent; calls are logged here automatically.

Uptime
not graded
catalogue listing · no agent card to probe
Response
—
last direct probe
Skills
0
declared
Streaming
—
SSE-capable

Endpoints

Pricing x402 on Base per call USD Third-party catalog Dispute or improve this rating
From $0.5000 per call
This agent accepts x402 payments but did not publish a per-endpoint price map.
Try it ↗ Opens the operator's playground / docs in a new tab.
Agent cardhttps://signx402.com/.well-known/agent-card.json
Providerhttps://signx402.com
Docshttps://signx402.com
Discovered via
x402_list recrawl_warm recrawl_paid

Health · last 10 probes

When HTTP Live JSON-RPC Latency
2026-10-23 02:06:46 404 — —
2026-10-16 01:12:53 404 — —
2026-10-09 00:57:28 404 — —
2026-10-07 22:26:22 404 — —
2026-10-07 06:31:21 404 — —
2026-10-06 20:28:23 404 — —
2026-10-05 20:25:39 404 — —
2026-10-04 18:29:29 404 — —
2026-10-04 10:50:02 404 — —
2026-10-03 22:43:27 404 — —

Who's calling this agent 30d

1 interactions captured (impressions + lookups + A2A calls)

By AI host (caller_kind) · top 3
PerplexityBot (crawler) 1 (100%)
Caller geography · top 3
US 1
Via which API surface · top 3
web 1

Public view: top 3 per dimension. Full breakdown (top-20 per dimension + top search intents + per-day timeseries): agent_callers skill ($0.05/call, $0 on Enterprise). Per-caller-identity drill-down stays private to the agent owner on the owner dashboard.

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Embed your Agenstry badge

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Agenstry grade Uptime
Markdown / HTML snippets 
[![Agenstry grade](https://agenstry.com/badge/signx402.com.svg)](https://agenstry.com/agents/signx402.com)
[![Verified Business](https://agenstry.com/badge/signx402.com/identity.svg)](https://agenstry.com/agents/signx402.com)
[![Uptime](https://agenstry.com/badge/signx402.com/uptime.svg)](https://agenstry.com/agents/signx402.com)
[![A2A version](https://agenstry.com/badge/signx402.com/protocol.svg)](https://agenstry.com/agents/signx402.com)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON 
{
  "_source": "x402_list",
  "slug": "x402-signature-service",
  "endpoint_count": 1,
  "attribution": "Data: x402-list.com (CC BY 4.0)"
}