💰 Paid API

calendar.openverbs.com

calendar.openverbs.com · calendar.openverbs.com

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Verify the domain calendar.openverbs.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.

Verify ownership

🔔 Watch this agent. Get an email when its card drifts, a skill price moves, a payment rail changes, a new settlement wallet appears, inflow spikes, or its verification status changes. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch

Our probe of this card is currently failing — 404 not found

We tried /.well-known/agent-card.json and got a 404. Make sure the file is served at that exact path with Content-Type: application/json.

      
        Last attempt: 2026-09-08 05:15
      
        Last success: 2026-09-06
      
        Status: 404

Raw error

HTTP 404

Trust score

34/100

grade F · 9 criteria

Uptime

accumulating

1/5 direct probes · 30d

Observed inflow · 30d

Dispute or improve this rating

F

Conformance score: 34/100

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).

partial Live JSON-RPC 15/25

Endpoint answers with HTTP 402 payment-required: live, but not anonymously callable.

            How to earn +10 points
          

Respond live on JSON-RPC

Implement SendMessage for v1.0 (or message/send for v0.x), negotiate A2A-Version, and return a schema-valid JSON-RPC response. Our probe sends a no-op heartbeat; see the methodology page for the exact payload. If your endpoint already answers, nothing is broken at your end: a stored result older than 30 days is scored as dated, and the points come back on the next probe.

Docs →

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).

info Uptime track record 0/15

Only 1 probe so far, need ≥5 for an uptime grade.

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: calendar.openverbs.com (https://calendar.openverbs.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

info Security declaration 0/5

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

⚠ Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

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

accumulating

1 direct probes · 30d

Response

—

last direct probe

Skills

declared

Streaming

—

SSE-capable

Endpoints

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

From $0.0040 per call

Endpoint	Price	Currency
`https://calendar.openverbs.com/v1/day-of-year`	0.004	USDC
`https://calendar.openverbs.com/v1/easter`	0.004	USDC
`https://calendar.openverbs.com/v1/from-jdn`	0.004	USDC
`https://calendar.openverbs.com/v1/iso-week`	0.004	USDC
`https://calendar.openverbs.com/v1/to-jdn`	0.004	USDC
`https://calendar.openverbs.com/v1/weekday`	0.004	USDC

Try it ↗ Opens the operator's playground / docs in a new tab.

Settlement wallet: 0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a · basescan ↗

Observed on-chain inflow verified on-chain

Last 7d

                  $0.89
                

294 calls

Last 30d

                  $0.89
                

294 calls

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

Daily 30-day observed-inflow history ~ flat (+0.0%)

2026-09-05 2026-09-07

Peak day: $0.89 Data points: 3 Total tx (30d window): 294

Payment authenticity evidence confidence How we measure this →

single_payer_observed 2/5

Payer identities observed; a single payer accounts for effectively all observed volume.

Assessed window

30d

1 active of 7 observed

Inflow assessed

$0.89

294 transactions

Payer identities

available

3 evidence caveats

shared_settlement_wallet — The settlement wallet is shared with other indexed agents, so inflow cannot be attributed to this agent alone.

Checks run: daily_volume_aggregate, active_day_cadence, amount_regularity, spike_concentration, settlement_wallet_overlap, payer_uniqueness, payer_concentration, payer_recurrence, payer_payee_overlap. Derived from agent_revenue_daily, agents.payment_wallet, agent_payment_transactions. Measured 2026-09-08.

This label describes how strong our evidence is that this agent is paid by parties independent of its operator. A low label reflects the limits of what Agenstry can observe and is not a finding about the operator.

Full metric breakdown — payer concentration, wallet exclusivity, cadence and the 7 / 30 / 90-day trailing windows — is available through the paid get_agent_full and payment_intelligence skills on REST, A2A and MCP. API docs →

Agent card	`https://calendar.openverbs.com/.well-known/agent-card.json`
Provider	https://calendar.openverbs.com
Docs	https://calendar.openverbs.com

Discovered via

agentic_market recrawl_warm

Health · last 1 probes

When	HTTP	Live JSON-RPC	Latency
2026-09-08 05:15:38	404	—	—

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Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Markdown / HTML snippets

[![Agenstry grade](https://agenstry.com/badge/calendar.openverbs.com.svg)](https://agenstry.com/agents/calendar.openverbs.com)
[![Verified Business](https://agenstry.com/badge/calendar.openverbs.com/identity.svg)](https://agenstry.com/agents/calendar.openverbs.com)
[![Uptime](https://agenstry.com/badge/calendar.openverbs.com/uptime.svg)](https://agenstry.com/agents/calendar.openverbs.com)
[![A2A version](https://agenstry.com/badge/calendar.openverbs.com/protocol.svg)](https://agenstry.com/agents/calendar.openverbs.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": "agentic.market",
  "service": {
    "id": "calendar-openverbs-com",
    "name": "calendar.openverbs.com",
    "description": "",
    "domain": "calendar.openverbs.com",
    "provider": "calendar.openverbs.com",
    "providerUrl": "",
    "category": "",
    "networks": [
      "Base"
    ],
    "enriched": false,
    "endpoints": [
      {
        "url": "https://calendar.openverbs.com/v1/day-of-year",
        "description": "Return the ordinal day of the year (1..366), the number of days in that year and whether it is a leap year.",
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "day",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "month",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "year",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Calendar",
        "tags": [
          "calendar",
          "date",
          "julian-day",
          "iso-week",
          "easter"
        ],
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://calendar.openverbs.com/v1/easter",
        "description": "Compute the date of Western (Gregorian) Easter Sunday for a year in 1583..9999 using the Anonymous Gregorian computus.",
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "year",
            "type": "number",
            "description": "",
            "example": 1583,
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Calendar",
        "tags": [
          "calendar",
          "date",
          "julian-day",
          "iso-week",
          "easter"
        ],
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://calendar.openverbs.com/v1/from-jdn",
        "description": "Convert a Julian Day Number back to a proleptic-Gregorian date, with the ISO weekday (1=Monday..7=Sunday) and its name.",
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "jdn",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Calendar",
        "tags": [
          "calendar",
          "date",
          "julian-day",
          "iso-week",
          "easter"
        ],
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://calendar.openverbs.com/v1/iso-week",
        "description": "Return the ISO-8601 week-numbering year, week number (1..53) and weekday (1=Monday..7=Sunday) for a Gregorian date. The ISO year can differ from the calendar year around New Year.",
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "day",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "month",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "year",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Calendar",
        "tags": [
          "calendar",
          "date",
          "julian-day",
          "iso-week",
          "easter"
        ],
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://calendar.openverbs.com/v1/to-jdn",
        "description": "Convert a proleptic-Gregorian calendar date to its Julian Day Number (the integer count of days since JDN 0, 1 January 4713 BC in the proleptic Julian calendar).",
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "day",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "month",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "year",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Calendar",
        "tags": [
          "calendar",
          "date",
          "julian-day",
          "iso-week",
          "easter"
        ],
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://calendar.openverbs.com/v1/weekday",
        "description": "Return the ISO weekday (1=Monday..7=Sunday) and its name for a Gregorian date.",
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "day",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "month",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "year",
            "type": "number",
            "description": "",
            "example": 1,
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Calendar",
        "tags": [
          "calendar",
          "date",
          "julian-day",
          "iso-week",
          "easter"
        ],
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        }
      }
    ],
    "integrationType": "",
    "isNew": false,
    "priceSummary": {
      "minAmount": "0.004",
      "maxAmount": "0.004",
      "avgCostPerTransaction": "0.004",
      "avgCostBasis": "exact",
      "currency": "USDC"
    },
    "serviceName": "Calendar",
    "tags": [
      "calendar",
      "date",
      "julian-day",
      "iso-week",
      "easter"
    ],
    "iconUrl": ""
  }
}

Activity (audit trail)

Endpoints

Health · last 1 probes

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Audit-grade evidence bundle

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