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💰 Paid API

Api

api.foursec.xyz · api.foursec.xyz

x402-protected paid API on api.foursec.xyz (discovered via Coinbase facilitator).

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Verify the domain api.foursec.xyz 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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Our probe of this card is currently failing

Last probe error:

schema invalid: 1 validation error for AgentCard
capabilities
  Input should be a valid dictionary or instance of Capabilities [type=model_type, input_value=['market-data', 'li

      
        Last attempt: 2026-08-10 01:34
      
        Last success: 2026-08-10
      
        Status: 200

Trust score

33/100

grade F · 9 criteria

Uptime

92.1%

38 probes

Observed inflow · 30d

$0.00

wallet active · no inflow

Dispute or improve this rating

F

Conformance score: 33/100

F-grade: card is reachable but fails most operational signals.

click to expand breakdown ▾ click to collapse breakdown ▴

pass Valid AgentCard 10/10

Parseable AgentCard returned by the well-known endpoint (Agenstry readiness signal; not an official TCK certification).

info Live JSON-RPC 0/25

Live probe hasn't run yet.

fail Protocol version 0/10

No protocolVersion in card.

            How to earn +10 points
          

Declare protocolVersion

Add `"protocolVersion": "1.0"` to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.

Docs →

info JWS signature 0/10

Card is unsigned (most published agents are).

partial Uptime track record 14/15

35/38 probes succeeded (92% uptime).

            How to earn +1 point
          

Stabilise uptime

We probe every agent on a tiered schedule. Sustained 99 %+ uptime over 20+ checks scores full points. Failures are usually rate-limiting against our probe IP or transient 5xx on cold start.

Docs →

fail Skill declaration 0/10

No skills declared in card. Hard to route to.

            How to earn +10 points
          

Declare your skills

Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags`. We canonicalise these into the global skill taxonomy on next probe.

Docs →

partial Verified Identity 5/10

Provider declared: api.foursec.xyz (https://api.foursec.xyz/). 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

info Security declaration 0/5

Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.

Activity (audit trail)

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

No calls observed in the last 7 days. Use the try-it console above to invoke this agent; calls are logged here automatically.

Uptime

92.1%

38 probes

Response

507ms

last probe

Skills

declared

Streaming

—

SSE-capable

Endpoints

Pricing x402 on Base per call USDC Facilitator feed Dispute or improve this rating

From $0.0050 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.

Settlement wallet: 0x09b00dfe1e9b09653191fe8b3edab5f2f0504dfe · basescan ↗

Observed on-chain inflow verified on-chain

Last 7d

                  $0.00
                

0 calls

Last 30d

                  $0.00
                

0 calls

USDC inflows on Base. Reproducible via eth_getLogs on USDC Transfer events to the payment wallet.

Daily 30-day observed-inflow history

2026-08-04 2026-08-10

Peak day: $0.00 Data points: 7 Total tx (30d window): 0

Agent card	`https://api.foursec.xyz/agent.json`
Provider	https://api.foursec.xyz/
Docs	https://api.foursec.xyz/liquidation/recent

Discovered via

cdp_discovery recrawl_hot

Health · last 2 probes

When	HTTP	Live JSON-RPC	Latency
2026-07-20 10:51:42	200	—	507ms
2026-07-12 19:54:55	200	—	860ms

Who's calling this agent 30d

1 interactions captured (impressions + lookups + A2A calls)

By AI host (caller_kind) · top 3

curl 1 (100%)

Caller geography · top 3

ES 1

Via which API surface · top 3

rest 1

Public teaser: top-3 per dimension only. 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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Markdown / HTML snippets

[![Agenstry grade](https://agenstry.com/badge/api.foursec.xyz.svg)](https://agenstry.com/agents/api.foursec.xyz)
[![Verified Business](https://agenstry.com/badge/api.foursec.xyz/identity.svg)](https://agenstry.com/agents/api.foursec.xyz)
[![Uptime](https://agenstry.com/badge/api.foursec.xyz/uptime.svg)](https://agenstry.com/agents/api.foursec.xyz)
[![A2A version](https://agenstry.com/badge/api.foursec.xyz/protocol.svg)](https://agenstry.com/agents/api.foursec.xyz)

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": "cdp_discovery",
  "resource_count": 22,
  "sample": "https://api.foursec.xyz/volatility-index/:symbol"
}

Activity (audit trail)

Endpoints

Health · last 2 probes

Who's calling this agent 30d

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Audit-grade evidence bundle

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