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llmstxt.info directory · Standard
_done
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llms.txt reachable
AI Impact Score 90/100 · A
_done provides structured information for AI assistants via an llms.txt file. Industry: Developer Tools. The website underscoredone.com provides its llms.txt at https://underscoredone.com/llms.txt. Listed since 4 August 2026.
llms.txt address
https://underscoredone.com/llms.txt
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# _done
> Actions for AI. Real-world tasks your agent can't do alone.
> via x402/USDC on Base mainnet. No accounts, no API keys, no subscriptions.
API cost starts from $0.01 per request. To call one: POST JSON to the endpoint,
receive HTTP 402 with payment details, sign a USDC authorization, retry
with the X-PAYMENT header, get the result. Supports Base and Solana USDC.
Every API lives at its own subdomain: https://{api-name}.underscoredone.com
Machine-readable discovery: /.well-known/x402.json (all payment-gated
endpoints) and /openapi.json (aggregated OpenAPI 3.1 spec).
## APIs
- [ASN Lookup](https://underscoredone.com/asn_lookup/): Look up the network operator, country, and address block behind any IP address or ASN number. [OpenAPI](https://asn-lookup.underscoredone.com/openapi.json)
- [BIMI Checker](https://underscoredone.com/bimi_checker/): Checks whether a website's email branding setup is correct so its logo shows up in inboxes. [OpenAPI](https://bimi-checker.underscoredone.com/openapi.json)
- [CORS Header Checker](https://underscoredone.com/cors_header_checker/): Send a URL and origin, get back exactly which cross-origin permissions that server grants. [OpenAPI](https://cors-header-checker.underscoredone.com/openapi.json)
- [US CPI Data & Inflation Report](https://underscoredone.com/cpi_report_us/): Returns the latest, a specific month's, or a historical range of official US inflation (CPI) figures from BLS . [OpenAPI](https://cpi-report-us.underscoredone.com/op
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