# Onto

**Canonical:** https://apis.io/providers/buildonto-dev/  
**Website:** https://buildonto.dev/  
**APIs profiled:** 1

Onto provides a platform that makes website content readable to AI agents by serving clean Markdown at the same URLs. It offers a Read API, an MCP server, and tools for indexing, training data collection, and AI search integration. Free tier includes 1,000 credits per month with no credit card required. The service helps improve AI citation accuracy and reduces hallucinations by providing agents with exact page content.

## Kin Score — 46.4 / 100 (developing)

Scored 2026-11-06 under rubric 0.27.0.

| Facet | Score |
|---|---|
| Discoverability | 66.1 |
| Contract Quality | 68.3 |
| Contract Governance | 22.0 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 29.2 |
| Access Clarity | 53.9 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 24.5 (matched via fallback).

## Agent readiness — 45.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | served |
| Idempotency | no |
| Error Semantics | derived |
| OpenAPI Examples | verified |
| Rate Limit Signal | verified |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | served |
| Protected Resource Metadata | verified |
| Dynamic Client Registration | yes |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |
| MCP Tool Quality | na |

## Access

Freemium · Open access — onboarding: open, pricing: freemium, trial: no (confidence: medium).

## APIs (7)

- **Onto Batch API** — Read, score, or extract up to 50 URLs (a list or a whole site) in one call.
- **Onto Extract API** — Return the structured data a page declares (JSON-LD, OpenGraph, meta). Deterministic, no AI.
- **Onto Map API** — Discover a site's URLs via sitemap, then links — without reading them.
- **Onto Read API** — Fetch and clean public URLs into agent-ready Markdown.
- **Onto Read + Score API** — One call, both outputs — Markdown plus the scoring metadata.
- **Onto Score API** — Run the AIO scorer on a URL — returns 0–100 score, penalties, benefits, recommendations.
- **Onto Usage API** — Plan quota, concurrent-slot state, and credit balance.

## Agentic access (1)

- **Buildonto Dev Agentic Access** — 7 operations · 6 acting

## Security (3)

- **Buildonto Dev Authentication** — 2 schemes
- **Buildonto Dev Domain Security** — TLSv1.3 · HSTS · DMARC
- **Buildonto Dev Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Buildonto Dev Plans Pricing**

## Tags

Artificial Intelligence, Content, Markdown, Read API, Platform

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/buildonto-dev/). Scores are computed from the provider's own public artifacts under a published rubric.