RFC 9110 Content Negotiation Enabled

API cheat sheets built for humans & AI agents

Token-dense API references, runnable cURL commands, and critical provider gotchas. Zero client-side framework bloat, sub-250-token markdown payloads, and instant edge routing.

Live Providers

519

Normalized Endpoints

< 250

Tokens / Cheat Sheet

0 KB

Framework JS

API Providers

View Full /llms.txt →

ElevenLabs ai-voice 388 endpoints

Base URL: https://api.elevenlabs.io • Auth: xi-api-key

Browse Endpoints → llms.txt

Critical Gotcha: Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.

Sample Endpoints:

POST /v1/text-to-speech/{voice_id}

→

POST /v1/speech-to-speech/{voice_id}/stream

→

GET /v1/voices

→

POST /v1/sound-generation

→

Resend messaging 109 endpoints

Base URL: https://api.resend.com • Auth: Authorization

Browse Endpoints → llms.txt

Critical Gotcha: All requests must include a `User-Agent` header (e.g. `User-Agent: my-app/1.0`) or the API returns HTTP 403.

Sample Endpoints:

Firecrawl scraping 22 endpoints

Base URL: https://api.firecrawl.dev/v1 • Auth: Authorization

Browse Endpoints → llms.txt

Critical Gotcha: The `formats` field controls the output shape and defaults to `["markdown"]`. Omitting it does not return HTML — request `["markdown","html"]` explicitly.

Sample Endpoints:

Using with Autonomous AI Agents & Cursor

apicheats.dev supports RFC 9110 content negotiation at the edge. Any client requesting an endpoint with Accept: text/markdown instantly receives the compact Markdown cheat sheet without HTML wrappers.

# Curl with Accept header for raw token-dense markdown:

curl -H "Accept: text/markdown" https://apicheats.dev/resend/emails-send

# Or fetch the direct markdown sibling file:

curl https://apicheats.dev/resend/emails-send.md