SPF Include Budget
Compute the exact SPF lookup cost across a supplied include tree. The budget of ten resolving mechanisms is shared across the whole evaluation rather than per record, which is why a record with three includes can cost fourteen lookups and no single record looks wrong. Reports the total against the limit, the headroom left, a cycle in the include chain, and every include whose record was not supplied so the total is a floor.
SearchLiveeip155:8453Exactvia cdp
SpfEmail authenticationDomain trustCapacityDeveloper tooling
Settlements · 30d
219↓ 38%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$25.35
Verified settled volume
256 settlements proven x402 by their on-chain EIP-3009 marker.
$0.180
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-04 08:41Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "180000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://api.zfinia.com/x402/v1/spf-include-budget-audit",
"tags": [
"spf",
"email authentication",
"domain trust",
"capacity",
"developer tooling"
],
"mimeType": "application/json",
"description": "Compute the exact SPF lookup cost across a supplied include tree. The budget of ten resolving mechanisms is shared across the whole evaluation rather than per record, which is why a record with three includes can cost fourteen lookups and no single record looks wrong. Reports the total against the limit, the headroom left, a cycle in the include chain, and every include whose record was not supplied so the total is a floor.",
"serviceName": "SPF Include Budget"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"domain": "example.test",
"records": [
{
"domain": "example.test",
"record": "v=spf1 include:_spf.vendor-a.test include:_spf.vendor-b.test include:_spf.shared.test ~all"
},
{
"domain": "_spf.vendor-a.test",
"record": "v=spf1 a mx include:_spf.shared.test include:_spf.regional.test ip4:203.0.113.0/24 ~all"
},
{
"domain": "_spf.vendor-b.test",
"record": "v=spf1 a:mail.vendor-b.test mx include:_spf.vendor-a.test ip4:198.51.100.0/24 ~all"
},
{
"domain": "_spf.shared.test",
"record": "v=spf1 a mx exists:%{i}._auth.shared.test ip4:192.0.2.0/24 ~all"
},
{
"domain": "_spf.regional.test",
"record": "v=spf1 include:_spf.unsupplied.test a ~all"
}
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"domain": "example.test",
"limits": {
"maxRecords": 2000,
"maxFindings": 500,
"maxHeaderBytes": 131072,
"maxIncludeTree": 200,
"spfLookupLimit": 10,
"maxRecordLength": 4096,
"spfVoidLookupLimit": 2
},
"passed": false,
"domains": [
{
"terms": 6,
"domain": "_spf.vendor-a.test",
"record": "v=spf1 a mx include:_spf.shared.test include:_spf.regional.test ip4:203.0.113.0/24 ~all",
"own_lookups": 4
},
{
"terms": 6,
"domain": "_spf.vendor-a.test",
"record": "v=spf1 a mx include:_spf.shared.test include:_spf.regional.test ip4:203.0.113.0/24 ~all",
"own_lookups": 4
},
{
"terms": 5,
"domain": "_spf.shared.test",
"record": "v=spf1 a mx exists:%{i}._auth.shared.test ip4:192.0.2.0/24 ~all",
"own_lookups": 3
}
],
"complete": false,
"findings": [
{
"code": "LOOKUP_LIMIT_EXCEEDED",
"detail": "The whole evaluation needs 27 DNS-resolving mechanisms against a limit of 10. Beyond the limit the result is a permanent error, which most receivers treat as the domain having no SPF, so every message..."
}
],
"headroom": -17,
"request_id": "example-request",
"service_id": "spf_include_budget_audit",
"assumptions": [
"The budget is shared across the whole evaluation rather than per record, as the specification defines it. That is why a record with three includes can cost fourteen lookups and no single record looks ...",
"A domain included from two places spends its lookups on each path, because there is no cache across mechanisms within one evaluation. That is noted, since it is the usual reason a budget is spent fast...",
"An include whose record was not supplied contributes nothing, so the total is a floor rather than the true count, and every such domain is listed."
],
"limitations": [
"The tree supplied. Nothing resolves DNS, so a vendor record that has grown since the tree was captured is not reflected here.",
"within_budget is true only when the whole tree was supplied and the total stayed clear of the limit."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"lookup_limit": 10,
"not_examined": [
"DOMAIN_INCLUDED_TWICE: _spf.vendor-a.test is included from more than one place. Its lookups are spent on each path, which is what makes a shared vendor include expensive.",
"DOMAIN_INCLUDED_TWICE: _spf.shared.test is included from more than one place. Its lookups are spent on each path, which is what makes a shared vendor include expensive.",
"DOMAIN_INCLUDED_TWICE: _spf.regional.test is included from more than one place. Its lookups are spent on each path, which is what makes a shared vendor include expensive."
],
"finding_count": 1,
"within_budget": false,
"service_version": "1.0.0",
"findings_by_code": {
"LOOKUP_LIMIT_EXCEEDED": 1
},
"total_dns_lookups": 27,
"unresolved_includes": [
"_spf.unsupplied.test"
],
"supplied_record_count": 5,
"evaluated_domain_count": 9
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"domain",
"records"
],
"properties": {
"domain": {
"type": "string",
"maxLength": 253
},
"records": {
"type": "array",
"items": {
"type": "object",
"required": [
"domain",
"record"
],
"properties": {
"domain": {
"type": "string",
"maxLength": 253
},
"record": {
"type": "string",
"maxLength": 4096
}
},
"additionalProperties": false
},
"maxItems": 200,
"minItems": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.18USDC≈ $0.18 USD
on Base · exact scheme
Pay 0.18 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.
- Paid to
- 0x25e8…a9608
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 180000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "180000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"domain": "example.test",
"records": [
{
"domain": "example.test",
"record": "v=spf1 include:_spf.vendor-a.test include:_spf.vendor-b.test include:_spf.shared.test ~all"
},
{
"domain": "_spf.vendor-a.test",
"record": "v=spf1 a mx include:_spf.shared.test include:_spf.regional.test ip4:203.0.113.0/24 ~all"
},
{
"domain": "_spf.vendor-b.test",
"record": "v=spf1 a:mail.vendor-b.test mx include:_spf.vendor-a.test ip4:198.51.100.0/24 ~all"
},
{
"domain": "_spf.shared.test",
"record": "v=spf1 a mx exists:%{i}._auth.shared.test ip4:192.0.2.0/24 ~all"
},
{
"domain": "_spf.regional.test",
"record": "v=spf1 include:_spf.unsupplied.test a ~all"
}
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"domain": "example.test",
"limits": {
"maxRecords": 2000,
"maxFindings": 500,
"maxHeaderBytes": 131072,
"maxIncludeTree": 200,
"spfLookupLimit": 10,
"maxRecordLength": 4096,
"spfVoidLookupLimit": 2
},
"passed": false,
"domains": [
{
"terms": 6,
"domain": "_spf.vendor-a.test",
"record": "v=spf1 a mx include:_spf.shared.test include:_spf.regional.test ip4:203.0.113.0/24 ~all",
"own_lookups": 4
},
{
"terms": 6,
"domain": "_spf.vendor-a.test",
"record": "v=spf1 a mx include:_spf.shared.test include:_spf.regional.test ip4:203.0.113.0/24 ~all",
"own_lookups": 4
},
{
"terms": 5,
"domain": "_spf.shared.test",
"record": "v=spf1 a mx exists:%{i}._auth.shared.test ip4:192.0.2.0/24 ~all",
"own_lookups": 3
}
],
"complete": false,
"findings": [
{
"code": "LOOKUP_LIMIT_EXCEEDED",
"detail": "The whole evaluation needs 27 DNS-resolving mechanisms against a limit of 10. Beyond the limit the result is a permanent error, which most receivers treat as the domain having no SPF, so every message..."
}
],
"headroom": -17,
"request_id": "example-request",
"service_id": "spf_include_budget_audit",
"assumptions": [
"The budget is shared across the whole evaluation rather than per record, as the specification defines it. That is why a record with three includes can cost fourteen lookups and no single record looks ...",
"A domain included from two places spends its lookups on each path, because there is no cache across mechanisms within one evaluation. That is noted, since it is the usual reason a budget is spent fast...",
"An include whose record was not supplied contributes nothing, so the total is a floor rather than the true count, and every such domain is listed."
],
"limitations": [
"The tree supplied. Nothing resolves DNS, so a vendor record that has grown since the tree was captured is not reflected here.",
"within_budget is true only when the whole tree was supplied and the total stayed clear of the limit."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"lookup_limit": 10,
"not_examined": [
"DOMAIN_INCLUDED_TWICE: _spf.vendor-a.test is included from more than one place. Its lookups are spent on each path, which is what makes a shared vendor include expensive.",
"DOMAIN_INCLUDED_TWICE: _spf.shared.test is included from more than one place. Its lookups are spent on each path, which is what makes a shared vendor include expensive.",
"DOMAIN_INCLUDED_TWICE: _spf.regional.test is included from more than one place. Its lookups are spent on each path, which is what makes a shared vendor include expensive."
],
"finding_count": 1,
"within_budget": false,
"service_version": "1.0.0",
"findings_by_code": {
"LOOKUP_LIMIT_EXCEEDED": 1
},
"total_dns_lookups": 27,
"unresolved_includes": [
"_spf.unsupplied.test"
],
"supplied_record_count": 5,
"evaluated_domain_count": 9
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"domain",
"records"
],
"properties": {
"domain": {
"type": "string",
"maxLength": 253
},
"records": {
"type": "array",
"items": {
"type": "object",
"required": [
"domain",
"record"
],
"properties": {
"domain": {
"type": "string",
"maxLength": 253
},
"record": {
"type": "string",
"maxLength": 4096
}
},
"additionalProperties": false
},
"maxItems": 200,
"minItems": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-04 08:41Z
- Last indexed by Roundhouse
- 2026-10-05 00:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-05 00:45Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service SPF Include Budget and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=SPF%20Include%20Budget' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.zfinia.com/x402/v1/spf-include-budget-audit, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.