robots.txt Linter (RFC 9309)
Eleven paid HTTP endpoints on the x402 protocol: German law and German text — agent-readiness, accessibility (BFSG), imprint (§ 5 DDG), public holidays per federal state, cold-outreach policy, invoice details (§ 14 UStG), statutory deadlines (§§ 187-193 BGB), German readability, an llms.txt generator, a robots.txt linter (RFC 9309) — plus this service
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.05 USDC on Base to 0x4Dd5…cC1Dc. The signed payment is good for 5 minutes.
- Paid to
- 0x4Dd5…cC1Dc
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 50000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4Dd5E59475A55f1C2c0816469600663cb74cC1Dc",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"urls": [
"/example/page.html",
"/example/other"
],
"robots_txt": "User-Agent: *\nDisallow: *.gif$\nDisallow: /example/\nAllow: /publications/\nSitemap: https://example.de/sitemap.xml\n\nUser-Agent: foobot\nDisallow: /\nAllow: /example/page.html\n",
"user_agent": "foobot"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"note": "…",
"input": {
"bytes": 180,
"lines": 10,
"rules": 5,
"groups": 2,
"other_records": 1
},
"checks": [
{
"key": "product_token_charset",
"rfc": "§2.2.1",
"status": "ok",
"findings": 0
}
],
"groups": [
{
"line": 8,
"rules": [
{
"line": 9,
"type": "allow",
"effect": "matching",
"pattern": "/example/page.html"
}
],
"user_agents": [
"foobot"
]
}
],
"limits": {
"bytes": 180,
"within_limit": true,
"rfc_parsing_limit_bytes": 512000
},
"summary": {
"infos": 0,
"errors": 0,
"warnings": 1
},
"findings": [
{
"key": "path_starts_with_wildcard",
"rfc": "§2.2 (ABNF) vs §5.1",
"line": 2,
"check": "path_leading_slash",
"detail": "…",
"severity": "warning"
}
],
"decisions": [
{
"url": "/example/page.html",
"rule": "allow: /example/page.html",
"octets": 18,
"reason": "most_specific_match",
"decision": "allowed",
"tiebreak": null,
"rule_type": "allow",
"normalized": "/example/page.html"
}
],
"linted_at": "2026-07-26T09:00:00.000Z",
"applies_to": {
"match": "exact",
"rules": 2,
"user_agent": "foobot",
"merged_from": 1
},
"other_records": [
{
"key": "sitemap",
"line": 5,
"value": "https://example.de/sitemap.xml",
"standard": false
}
],
"interpretations": [
{
"rfc": "§2.2.2",
"why": "…",
"topic": "octet_counting",
"choice": "…"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"required": [
"robots_txt"
],
"properties": {
"urls": {
"type": "array",
"items": {
"type": "string"
},
"description": "URLs or paths whose access decision should be recomputed, at most 50"
},
"robots_txt": {
"type": "string",
"description": "Contents of the robots.txt to check"
},
"user_agent": {
"type": "string",
"description": "Product token to evaluate for, e.g. 'GPTBot'. A full User-Agent header is resolved to the token it contains. Required when 'urls' is given."
}
}
},
"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
- 2026-09-16 15:39Z
- Last indexed by Roundhouse
- 2026-09-24 14:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-11 17:46Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 405
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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 11 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service robots.txt Linter (RFC 9309) 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=robots.txt%20Linter%20(RFC%209309)' 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.ozdreamtools.de/api/robots/lint, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.