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💰 Paid API

checkdigit.openverbs.com

checkdigit.openverbs.com · checkdigit.openverbs.com

Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.

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Verify the domain checkdigit.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.

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🔔 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

Trust score

34/100

grade F · 9 criteria

Uptime

not measured

no direct probes in 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 0 probes 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: checkdigit.openverbs.com (https://checkdigit.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

not measured

0 direct probes · 30d

Response

—

no direct probe retained

Skills

declared

Streaming

—

SSE-capable

Endpoints

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

From $0.0020 per call

Endpoint	Price	Currency
`https://checkdigit.openverbs.com/v1/ean`	0.002	USDC
`https://checkdigit.openverbs.com/v1/imei`	0.002	USDC
`https://checkdigit.openverbs.com/v1/isbn`	0.002	USDC
`https://checkdigit.openverbs.com/v1/luhn`	0.002	USDC
`https://checkdigit.openverbs.com/v1/routing`	0.002	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://checkdigit.openverbs.com`
Provider	https://checkdigit.openverbs.com
Docs	https://checkdigit.openverbs.com

Discovered via

agentic_market cdp_discovery

Health · last 0 probes

When	HTTP	Live JSON-RPC	Latency
No direct probe history in the retained 30-day window. Upstream catalogue observations do not count as uptime probes.

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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/checkdigit.openverbs.com.svg)](https://agenstry.com/agents/checkdigit.openverbs.com)
[![Verified Business](https://agenstry.com/badge/checkdigit.openverbs.com/identity.svg)](https://agenstry.com/agents/checkdigit.openverbs.com)
[![Uptime](https://agenstry.com/badge/checkdigit.openverbs.com/uptime.svg)](https://agenstry.com/agents/checkdigit.openverbs.com)
[![A2A version](https://agenstry.com/badge/checkdigit.openverbs.com/protocol.svg)](https://agenstry.com/agents/checkdigit.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": "checkdigit-openverbs-com",
    "name": "checkdigit.openverbs.com",
    "description": "",
    "domain": "checkdigit.openverbs.com",
    "provider": "checkdigit.openverbs.com",
    "providerUrl": "",
    "category": "",
    "networks": [
      "Base"
    ],
    "enriched": false,
    "endpoints": [
      {
        "url": "https://checkdigit.openverbs.com/v1/ean",
        "description": "Validate a GTIN barcode number \u2014 EAN-8, UPC-A (12), EAN-13 or GTIN-14 \u2014 by the standard mod-10 check digit. Length selects the scheme.",
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "number",
            "type": "string",
            "description": "",
            "example": "example",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "EAN / UPC / GTIN check",
        "tags": [
          "gtin validation",
          "validate barcode number",
          "ean upc check digit",
          "upc validation",
          "ean 13 checksum"
        ],
        "quality": {
          "l30DaysTotalCalls": "3",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://checkdigit.openverbs.com/v1/imei",
        "description": "Validate a 15-digit mobile device IMEI by its Luhn check digit. Spaces and hyphens are ignored.",
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "imei",
            "type": "string",
            "description": "",
            "example": "example",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "IMEI check",
        "tags": [
          "imei validation",
          "validate imei number",
          "mobile device imei",
          "imei check digit",
          "imei luhn check"
        ],
        "quality": {
          "l30DaysTotalCalls": "3",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://checkdigit.openverbs.com/v1/isbn",
        "description": "Validate an ISBN-10 (mod-11, trailing X allowed) or ISBN-13 (GTIN mod-10) book number. Length after removing spaces/hyphens selects the scheme.",
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "isbn",
            "type": "string",
            "description": "",
            "example": "example",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "ISBN check",
        "tags": [
          "isbn validation",
          "validate isbn",
          "isbn check digit",
          "isbn 10 isbn 13",
          "book number lookup"
        ],
        "quality": {
          "l30DaysTotalCalls": "3",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://checkdigit.openverbs.com/v1/luhn",
        "description": "Validate a number by the Luhn (mod-10) algorithm \u2014 the scheme behind credit/debit card numbers and many IDs. Spaces and hyphens are ignored. A mismatched check digit is a successful { valid: false }.",
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "number",
            "type": "string",
            "description": "",
            "example": "example",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Luhn check",
        "tags": [
          "luhn validation",
          "validate credit card number",
          "mod 10 check digit",
          "luhn checksum api",
          "check card number"
        ],
        "quality": {
          "l30DaysTotalCalls": "3",
          "l30DaysUniquePayers": "1"
        }
      },
      {
        "url": "https://checkdigit.openverbs.com/v1/routing",
        "description": "Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.",
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "routingNumber",
            "type": "string",
            "description": "",
            "example": "example",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "ABA routing check",
        "tags": [
          "aba routing validation",
          "validate routing number",
          "bank routing checksum",
          "us routing number lookup",
          "aba check digit"
        ],
        "quality": {
          "l30DaysTotalCalls": "3",
          "l30DaysUniquePayers": "1"
        }
      }
    ],
    "integrationType": "",
    "isNew": false,
    "priceSummary": {
      "minAmount": "0.002",
      "maxAmount": "0.002",
      "avgCostPerTransaction": "0.002",
      "avgCostBasis": "exact",
      "currency": "USDC"
    },
    "serviceName": "",
    "tags": [
      "gtin validation",
      "validate barcode number",
      "ean upc check digit",
      "upc validation",
      "ean 13 checksum",
      "imei validation",
      "validate imei number",
      "mobile device imei",
      "imei check digit",
      "imei luhn check",
      "isbn validation",
      "validate isbn",
      "isbn check digit",
      "isbn 10 isbn 13",
      "book number lookup",
      "luhn validation",
      "validate credit card number",
      "mod 10 check digit",
      "luhn checksum api",
      "check card number",
      "aba routing validation",
      "validate routing number",
      "bank routing checksum",
      "us routing number lookup",
      "aba check digit"
    ],
    "iconUrl": ""
  }
}

Activity (audit trail)

Endpoints

Health · last 0 probes

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Audit-grade evidence bundle

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