AI developer tools via MCP. Pay-per-use from $0.01. No subscriptions.
bash
Install and configure for your IDE
npx 50c install
Set API key (get one at https://50c.ai)
50c config key YOUR_API_KEY
Test it
50c hints "api design patterns"
`
MCP Integration
50c is an MCP (Model Context Protocol) server. After install, your AI IDE can use all tools directly.
Supported IDEs: Claude Desktop, Cursor, Windsurf, VS Code, Verdent, Cline, Continue, Roo Code
$3
Add to your IDE's MCP config (~/.cursor/mcp.json, etc.):
`json
{
"mcpServers": {
"50c": {
"command": "npx",
"args": ["-y", "50c@latest"],
"env": {
"FIFTYC_API_KEY": "YOUR_API_KEY"
}
}
}
}
`
Tools
$3
| Tool | Description |
|------|-------------|
| web_search | Internet search |
| page_fetch | Fetch and extract URL content |
| domain_check | Check domain availability |
| fm_index, fm_find, fm_search, fm_lines | Fast file indexing and search |
| dewey_* | Knowledge indexing (add, search, list) |
| fog_check, fog_monitor | Context fog detection |
$3
| Tool | Cost | Description |
|------|------|-------------|
| hints | $0.05 | 5 brutal 2-word hints |
| hints_plus | $0.10 | 10 expanded 4-word hints |
| roast | $0.05 | Brutal code review with fixes |
| genius | $0.50 | Deep problem solving |
| genius_plus | $0.65 | Self-improving code generation |
| bcalc | $0.15 | Mathematical discovery engine |
| bcalc_why | $0.20 | Deep math explanations |
| compute | $0.02 | Python code execution |
| name_it | $0.03 | 5 names + domain availability |
| price_it | $0.05 | SaaS pricing strategy |
| one_liner | $0.02 | 8-word elevator pitch |
| mind_opener | $0.08 | 5 curious angles on a problem |
| prompt_expand | $0.10 | Expand idea into detailed concept |
| handoff | $0.10 | Generate project handoff document |
$3
| Tool | Cost | Description |
|------|------|-------------|
| beacon_compress | $0.02 | Smart context compression |
| beacon_extract | $0.01 | Extract decisions/errors/entities |
| fog_check | FREE | Check context fog level |
| fog_monitor | FREE | Continuous fog monitoring |
| fog_clear | $0.03 | Clear fog (compress/extract/reset) |
| fog_checkpoint | $0.03 | Save conversation checkpoint |
| caz_dedup | $0.02 | Content-addressable deduplication |
| context_compress | $0.03 | CAZ + BM25 relevance compression |
$3
| Tool | Description |
|------|-------------|
| cf_list_zones, cf_list_dns, cf_ssl_status | Cloudflare management (FREE) |
| cf_create_dns, cf_purge_cache | Cloudflare write operations ($0.02) |
| ux_contrast_check, ux_spacing_system | UI/UX utilities (FREE) |
| ux_color_palette, ux_a11y_check, ux_roast | UI/UX analysis ($0.02-$0.05) |
$3
Create and share reusable AI macros:
| Tool | Cost | Description |
|------|------|-------------|
| sub_mint | $5.00 | Mint workflow as reusable macro |
| sub_run | ~$2.00 | Run a minted macro |
| sub_list, sub_get, sub_discover | FREE | Browse macros |
| sub_clone | FREE | Clone public macro to your collection |
| sub_set_public | FREE | List macro on marketplace |
Creators earn 60% revenue share on marketplace sales.
50c Team
Natural language orchestration - describe what you want, Team picks the right tools:
`
"roast my code and suggest fixes" → roast + hints
"check if coolstartup.ai is available" → domain_check
"research AI trends and summarize" → web_search + genius
`
Enterprise-gated tools (require cv_ent_* API key + 50c-vault):
- team_ssh - SSH/SCP/SFTP to servers
- team_deploy - Deploy to production
- team_exec - Execute remote commands
- team_http - HTTP requests to your endpoints
CLI Commands
`bash
50c status # Check connectivity
50c balance # Check credit balance
50c config key # Set API key
50c config show # Show config
Direct tool calls
50c hints "topic"
50c roast "code snippet"
50c genius "complex problem"
`
Companion Packages
- 50c-vault - Secure credential storage with passphrase encryption
`bash
npx 50c-vault init
npx 50c-vault set MY_SECRET
`
Pricing
- Free tier: 40+ tools (search, file indexing, fog detection, etc.)
- Pay-per-use: 1 credit = $0.01, top up anytime
- No subscriptions: Credits never expire
Pre-Publish Verification
Thorough checks before publishing - catch embarrassing mistakes:
`bash
Verify npm package before publish
50c pre_publish npm
Verify arXiv paper
50c pre_publish arxiv
Verify medical/clinical paper
50c pre_publish medical
Other profiles: github, science, math
`
Profiles:
| Profile | Checks | Use Case |
|---------|--------|----------|
| npm | Version bump, links, secrets, syntax, deps | npm publish |
| github | Tags, CI, release notes, secrets in history | GitHub release |
| arxiv | LaTeX compile, refs, placeholders, code repo | arXiv submission |
| medical | IRB, CONSORT, stats, endpoints, disclosures | Clinical papers |
| science | Reproducibility, data, claims, figures | Scientific papers |
| math` | Proofs complete, definitions, notation | Math papers |