ProbeKit

Name: ProbeKit service
Creator: Agent GDP
License: https://creativecommons.org/licenses/by/4.0/

Unclassifiedx402 base

The service's listing describes it this way: Parse and evaluate a domain's SPF record: the include and redirect tree, qualifiers and the RFC 7208 limit of ten DNS lookups, with coded findings. Use when an agent must tell whether SPF is valid, why mail from a service fails SPF, or whether one more include would exceed the lookup limit. Website

A service is a tool an AI agent pays to call. ProbeKit is listed on this page settling on Base, through x402. 30-day settled volume on this page is $0.42. The listing comes from the service catalog. Open a row for payments, payers, and chains. See Bazaar, agent payment use cases, and the methodology.

FacilitatorsCoinbase

Payee

0x5be2…bc05Base

Methodology · settled volume through 2026-10-26 · catalog Oct 26, 2026, 4:02 PM UTC

Settled volume, payments, payers, average payment, use-case share, and rank
Metric	24h	7d	30d
Volume	$0.24	$0.42	$0.42
Payments	16	29	29
Payers	9	3	3
Avg payment	$0.0153	$0.0147	$0.0147
Share of use case	—	—	—
Rank	#315	#536	#695

Payers can be counted more than once when they paid through more than one facilitator.

Settled volume

$0.42

n/a

Payments

Payers

Avg payment

$0.0147

volume / payments

Daily volume and buyers

90D 1Y All

Data through Oct 26, 2026. Source: public settlement logs. Methodology

Payers

Buyer concentration

80.0%

Top payer's share of lifetime volume. Not the period selected above.

Repeat buyers

66.7%

Lifetime buyers with more than one payment, divided by all buyers.

Endpoints and prices

Price, network, and asset come from the x402 Bazaar catalog.

Endpoint	Network	Asset	Price	Scheme
https://api.probekit.dev/v1/mail/dkim Fetch and validate the DKIM public key record at selector._domainkey for a domain: key type, key size, revocation and syntax, with coded findings. Use when an agent knows the selector (s= in a DKIM-Signature header) and must confirm that the key is published and usable. It does n	base	USDC	$0.01	exact
https://api.probekit.dev/v1/mail/dmarc Look up the DMARC record of a domain or its organisational domain and explain policy, subdomain policy, alignment and reporting addresses, with coded findings. Use when an agent must tell whether a domain is protected against spoofing, which policy it enforces, or why DMARC repor	base	USDC	$0.01	exact
https://api.probekit.dev/v1/mail/mx List a domain's mail servers in preference order and detect null MX (RFC 7505) and MX targets that do not resolve, with coded findings. Use when an agent must find where mail for a domain is delivered or why a domain cannot receive mail.	base	USDC	$0.01	exact
https://api.probekit.dev/v1/mail/spf Parse and evaluate a domain's SPF record: the include and redirect tree, qualifiers and the RFC 7208 limit of ten DNS lookups, with coded findings. Use when an agent must tell whether SPF is valid, why mail from a service fails SPF, or whether one more include would exceed the lo	base	USDC	$0.01	exact
https://api.probekit.dev/v1/dns/lookup Resolve chosen DNS record types (A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV) for a name through public resolvers, with TTL, observation time and the resolver that answered. Use when an agent needs the current public DNS answer for a name, for example to confirm that a record chan	base	USDC	$0.005	exact
https://api.probekit.dev/v1/mail/check One report on a domain's mail setup: MX, SPF and DMARC, plus DKIM for the selectors you give, with coded findings and an overall status. Use when an agent needs a complete overview of a domain's email authentication and delivery configuration in one call instead of four.	base	USDC	$0.03	exact
https://api.probekit.dev/v1/mail/check/bulk Run the mail configuration check (MX, SPF, DMARC) on up to 20 domains in one request. Results keep the input order, and items that fail for a technical reason come with a token for a free retry. Use when an agent must audit many domains at once, for example a customer list or a p	base	USDC	$0.048	exact
https://api.probekit.dev/v1/dns/caa Evaluate a domain's CAA records (RFC 8659), climbing to parent names up to the registrable domain when the name has none: allowed issuers for normal and wildcard certificates, iodef, unknown critical tags and invalid values. Use when an agent must tell which certificate authoriti	base	USDC	$0.01	exact
https://api.probekit.dev/v1/dns/dnssec Report a domain's DNSSEC status (secure, insecure, bogus or unknown) as validated by public resolvers, with DS and DNSKEY algorithms, deprecated algorithms, SHA-1 digests and DS records without a matching key. Use when an agent must tell whether a domain is signed, why it fails o	base	USDC	$0.01	exact
https://api.probekit.dev/v1/mail/bimi Check a domain's BIMI record (<selector>._bimi, default selector, with fallback to the organisational domain): v=BIMI1 syntax, HTTPS logo and certificate URLs, an SVG logo path and whether DMARC is enforced at quarantine or reject with pct=100. Use when an agent must tell why a b	base	USDC	$0.01	exact
https://api.probekit.dev/v1/mail/ptr Check reverse DNS for a domain's mail servers: up to five MX hosts, their IPv4 and IPv6 addresses, each PTR name and whether it resolves back to the same address (FCrDNS), with coded findings. Use when an agent must tell whether a domain's mail servers have matching reverse DNS,	base	USDC	$0.01	exact
https://api.probekit.dev/v1/domain/health One report on a domain's mail and DNS security: MX, SPF, DMARC, common DKIM selectors, MTA-STS with TLS-RPT, DNSSEC, reverse DNS of the mail servers, BIMI and CAA in one call, each as its own section with coded findings and evidence. Use when an agent must audit a domain's email	base	USDC	$0.08	exact
https://api.probekit.dev/v1/mail/dkim-discover Try 27 common DKIM selectors (Google, Microsoft 365, Mailchimp, SendGrid, Mailgun, Zoho, Proton, Fastmail, Mailjet, Amazon SES and generic names) for a domain and validate every key found: type, size, revocation and testing flag. Use when an agent needs a domain's DKIM keys but d	base	USDC	$0.02	exact
https://api.probekit.dev/v1/mail/mta-sts Check a domain's MTA-STS setup (RFC 8461): the _mta-sts record, the HTTPS policy file with certificate check and no redirects, mode, max_age and whether every MX host is covered, plus the TLS-RPT record (RFC 8460). Use when an agent must tell whether inbound mail is protected aga	base	USDC	$0.02	exact

Facilitators used

Facilitator	Volume	Tx	Share
Coinbasex402	$0.42	29	100.0%

How we count ProbeKit

We read settlements directly from each chain's public records and refresh them every few minutes.

Data through 2026-10-26. Source: public settlement logs.

Full methodology → · How we compare with other trackers →

Cite this

APA

Agent GDP. (2026). ProbeKit [Data set]. Retrieved October 26, 2026, from https://agentgdp.io/service/api.probekit.dev.

MLA

"ProbeKit." Agent GDP, 26 Oct. 2026, https://agentgdp.io/service/api.probekit.dev.

BibTeX

@misc{agentgdp_probekit_2026,
  author = {{Agent GDP}},
  title = {ProbeKit},
  year = {2026},
  url = {https://agentgdp.io/service/api.probekit.dev},
  note = {Retrieved October 26, 2026. Data through 2026-10-26. Licensed under CC BY 4.0.},
  license = {https://creativecommons.org/licenses/by/4.0/}
}

Plain text

ProbeKit: $0.42 settled volume (7d), 29 payments, 3 buyers. Agent GDP, data through 2026-10-26. https://agentgdp.io/service/api.probekit.dev Retrieved October 26, 2026.

Data from Agent GDP (https://agentgdp.io/service/api.probekit.dev), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).

Payers on a day can be counted more than once if they paid through more than one facilitator. Growth compares this period with the previous period of the same length. The page link uses the service's site when we have one, and the payee address otherwise.

Volume and payment counts include earlier days. Transaction-level detail available from October 23, 2026.

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Cite this

APA

Agent GDP. (2026). Service settled volume [Data set]. Retrieved October 26, 2026, from https://agentgdp.io/service/api.probekit.dev.

MLA

"Service settled volume." Agent GDP, 26 Oct. 2026, https://agentgdp.io/service/api.probekit.dev.

BibTeX

@misc{agentgdp_service_settled_volume_2026,
  author = {{Agent GDP}},
  title = {Service settled volume},
  year = {2026},
  url = {https://agentgdp.io/service/api.probekit.dev},
  note = {Retrieved October 26, 2026. Licensed under CC BY 4.0.},
  license = {https://creativecommons.org/licenses/by/4.0/}
}

Plain text

Service settled volume. Agent GDP. https://agentgdp.io/service/api.probekit.dev. Retrieved October 26, 2026.

Data from Agent GDP (https://agentgdp.io/service/api.probekit.dev), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).

Metric

24h

30d

Volume

$0.24

$0.42

Payments

Payers

Avg payment

$0.0153

$0.0147

Share of use case

—

Rank

#315

#536

#695

Daily settled volume for ProbeKit

Time

Daily settled volume for ProbeKit

2026-10-25

$0.38

2026-10-26

$0.05

Daily buyers for ProbeKit

Time

Daily buyers for ProbeKit

2026-10-25

2026-10-26

Endpoint

Network

Asset

Price

Scheme

https://api.probekit.dev/v1/mail/dkim

Fetch and validate the DKIM public key record at selector._domainkey for a domain: key type, key size, revocation and syntax, with coded findings. Use when an agent knows the selector (s= in a DKIM-Signature header) and must confirm that the key is published and usable. It does n

base

USDC

$0.01

exact

https://api.probekit.dev/v1/mail/dmarc

Look up the DMARC record of a domain or its organisational domain and explain policy, subdomain policy, alignment and reporting addresses, with coded findings. Use when an agent must tell whether a domain is protected against spoofing, which policy it enforces, or why DMARC repor

base

USDC

$0.01

exact

https://api.probekit.dev/v1/mail/mx

List a domain's mail servers in preference order and detect null MX (RFC 7505) and MX targets that do not resolve, with coded findings. Use when an agent must find where mail for a domain is delivered or why a domain cannot receive mail.

base

USDC

$0.01

exact

https://api.probekit.dev/v1/mail/spf

Parse and evaluate a domain's SPF record: the include and redirect tree, qualifiers and the RFC 7208 limit of ten DNS lookups, with coded findings. Use when an agent must tell whether SPF is valid, why mail from a service fails SPF, or whether one more include would exceed the lo

base

USDC

$0.01

exact

https://api.probekit.dev/v1/dns/lookup

Resolve chosen DNS record types (A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV) for a name through public resolvers, with TTL, observation time and the resolver that answered. Use when an agent needs the current public DNS answer for a name, for example to confirm that a record chan

base

USDC

$0.005

exact

https://api.probekit.dev/v1/mail/check

One report on a domain's mail setup: MX, SPF and DMARC, plus DKIM for the selectors you give, with coded findings and an overall status. Use when an agent needs a complete overview of a domain's email authentication and delivery configuration in one call instead of four.

base

USDC

$0.03

exact

https://api.probekit.dev/v1/mail/check/bulk

Run the mail configuration check (MX, SPF, DMARC) on up to 20 domains in one request. Results keep the input order, and items that fail for a technical reason come with a token for a free retry. Use when an agent must audit many domains at once, for example a customer list or a p

base

USDC

$0.048

exact

https://api.probekit.dev/v1/dns/caa

Evaluate a domain's CAA records (RFC 8659), climbing to parent names up to the registrable domain when the name has none: allowed issuers for normal and wildcard certificates, iodef, unknown critical tags and invalid values. Use when an agent must tell which certificate authoriti

base

USDC

$0.01

exact

https://api.probekit.dev/v1/dns/dnssec

Report a domain's DNSSEC status (secure, insecure, bogus or unknown) as validated by public resolvers, with DS and DNSKEY algorithms, deprecated algorithms, SHA-1 digests and DS records without a matching key. Use when an agent must tell whether a domain is signed, why it fails o

base

USDC

$0.01

exact

https://api.probekit.dev/v1/mail/bimi

Check a domain's BIMI record (<selector>._bimi, default selector, with fallback to the organisational domain): v=BIMI1 syntax, HTTPS logo and certificate URLs, an SVG logo path and whether DMARC is enforced at quarantine or reject with pct=100. Use when an agent must tell why a b

base

USDC

$0.01

exact

https://api.probekit.dev/v1/mail/ptr

Check reverse DNS for a domain's mail servers: up to five MX hosts, their IPv4 and IPv6 addresses, each PTR name and whether it resolves back to the same address (FCrDNS), with coded findings. Use when an agent must tell whether a domain's mail servers have matching reverse DNS,

base

USDC

$0.01

exact

https://api.probekit.dev/v1/domain/health

One report on a domain's mail and DNS security: MX, SPF, DMARC, common DKIM selectors, MTA-STS with TLS-RPT, DNSSEC, reverse DNS of the mail servers, BIMI and CAA in one call, each as its own section with coded findings and evidence. Use when an agent must audit a domain's email

base

USDC

$0.08

exact

https://api.probekit.dev/v1/mail/dkim-discover

Try 27 common DKIM selectors (Google, Microsoft 365, Mailchimp, SendGrid, Mailgun, Zoho, Proton, Fastmail, Mailjet, Amazon SES and generic names) for a domain and validate every key found: type, size, revocation and testing flag. Use when an agent needs a domain's DKIM keys but d

base

USDC

$0.02

exact

https://api.probekit.dev/v1/mail/mta-sts

Check a domain's MTA-STS setup (RFC 8461): the _mta-sts record, the HTTPS policy file with certificate check and no redirects, mode, max_age and whether every MX host is covered, plus the TLS-RPT record (RFC 8460). Use when an agent must tell whether inbound mail is protected aga

base

USDC

$0.02

exact

Facilitator

Volume

Coinbasex402

$0.42

100.0%

Cite this

APA

Agent GDP. (2026). ProbeKit [Data set]. Retrieved October 26, 2026, from https://agentgdp.io/service/api.probekit.dev.

MLA

"ProbeKit." Agent GDP, 26 Oct. 2026, https://agentgdp.io/service/api.probekit.dev.

BibTeX

@misc{agentgdp_probekit_2026,
  author = {{Agent GDP}},
  title = {ProbeKit},
  year = {2026},
  url = {https://agentgdp.io/service/api.probekit.dev},
  note = {Retrieved October 26, 2026. Data through 2026-10-26. Licensed under CC BY 4.0.},
  license = {https://creativecommons.org/licenses/by/4.0/}
}

Plain text

ProbeKit: $0.42 settled volume (7d), 29 payments, 3 buyers. Agent GDP, data through 2026-10-26. https://agentgdp.io/service/api.probekit.dev Retrieved October 26, 2026.

Data from Agent GDP (https://agentgdp.io/service/api.probekit.dev), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).

Get your badge

Paste this on your site. It says Indexed by Agent GDP, with this name, and it links back to this page.

Source: agentgdp.io · Beta

HTML

<a href="https://agentgdp.io/service/api.probekit.dev?utm_source=badge"><img src="https://agentgdp.io/badge/service/api.probekit.dev.svg" alt="api.probekit.dev · Indexed by Agent GDP" /></a>