Gleeful AI
Gleeful AI publishes Visibility, an AI-visibility and answer-engine-optimization audit API: it scores how visible and understandable a website is to AI assistants and agents, audits AI crawler access (GPTBot, ClaudeBot and others), generates a production-ready llms.txt and schema.org markup, checks brand citation across assistants, and runs competitor gap analysis. The access model is the notable part — there are no API keys. Every priced endpoint answers an unauthenticated request with HTTP 402 and an x402 v2 challenge in a Payment-Required header, settled in USDC on Base at prices from $0.06 to $0.55 a call, published machine-readably at /api/pricing alongside /api/capabilities and /api/catalog. Discovery, pricing and two preview endpoints are free. It is an agent-native API in both directions: built to be paid for and called by an agent, and built to measure whether agents can read you.
Gleeful AI publishes 17 APIs on the APIs.io network, including Audit API, Bots API, Capabilities API, and 14 more. Tagged areas include Artificial Intelligence, Agents, x402, Micropayments, and SEO.
Gleeful AI’s developer surface includes documentation, pricing, authentication, and 10 more developer resources.
Kin Score
APIs 17
Individual APIs this provider publishes, each with its own machine-readable definition.
Gleeful AI Audit API
The Audit API from Gleeful AI — 3 operation(s) for audit.
Gleeful AI Bots API
The Bots API from Gleeful AI — 1 operation(s) for bots.
Gleeful AI Capabilities API
The Capabilities API from Gleeful AI — 1 operation(s) for capabilities.
Gleeful AI Catalog API
The Catalog API from Gleeful AI — 1 operation(s) for catalog.
Gleeful AI Cite API
The Cite API from Gleeful AI — 2 operation(s) for cite.
Gleeful AI Compare API
The Compare API from Gleeful AI — 2 operation(s) for compare.
Gleeful AI Content API
The Content API from Gleeful AI — 1 operation(s) for content.
Gleeful AI Examples API
The Examples API from Gleeful AI — 1 operation(s) for examples.
Gleeful AI Fixes API
The Fixes API from Gleeful AI — 1 operation(s) for fixes.
Gleeful AI Health API
The Health API from Gleeful AI — 1 operation(s) for health.
Gleeful AI Llms API
The Llms API from Gleeful AI — 1 operation(s) for llms.
Gleeful AI Meta API
The Meta API from Gleeful AI — 1 operation(s) for meta.
Gleeful AI Preview API
The Preview API from Gleeful AI — 2 operation(s) for preview.
Gleeful AI Pricing API
The Pricing API from Gleeful AI — 1 operation(s) for pricing.
Gleeful AI Probe API
The Probe API from Gleeful AI — 1 operation(s) for probe.
Gleeful AI Schema API
The Schema API from Gleeful AI — 1 operation(s) for schema.
Gleeful AI Status API
The Status API from Gleeful AI — 1 operation(s) for status.
Scroll for all 17
Open Collections 17
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONVisibility AI Audit API
OPEN COLLECTIONVisibility AI Audit Bots API
OPEN COLLECTIONVisibility AI Audit Capabilities API
OPEN COLLECTIONVisibility AI Audit Catalog API
OPEN COLLECTIONVisibility AI Audit Cite API
OPEN COLLECTIONVisibility AI Audit Compare API
OPEN COLLECTIONVisibility AI Audit Content API
OPEN COLLECTIONVisibility AI Audit Examples API
OPEN COLLECTIONVisibility AI Audit Fixes API
OPEN COLLECTIONVisibility AI Audit Health API
OPEN COLLECTIONVisibility AI Audit Llms API
OPEN COLLECTIONVisibility AI Audit Meta API
OPEN COLLECTIONVisibility AI Audit Pricing API
OPEN COLLECTIONVisibility AI Audit Probe API
OPEN COLLECTIONVisibility AI Audit Schema API
OPEN COLLECTIONVisibility AI Audit Status API
OPEN COLLECTIONScroll for all 17
Pricing Plans 1
Published pricing tiers and plan structures.
Gleefulai Plans
PLANSRate Limits 1
Documented rate limits and quota policies.
Gleefulai Rate Limits
RATE LIMITSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 4
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
Source (apis.yml)
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for providers
9 MCP tools reach this
find_providersBrowse and filter every provider in the catalog.get_provider_artifactsEvery artifact this provider publishes, grouped by type.get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.get_provider_toolsEvery MCP tool they ship, with the operation each wraps.get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.get_provider_ratingPRO — composite, band, trend and facet scores.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
curl "https://apis.io/api/v1/providers/gleefulai"
curl "https://apis.io/api/v1/providers?limit=25"
curl "https://apis.io/api/v1/providers/gleefulai/operations?limit=25"
curl "https://apis.io/api/v1/providers/gleefulai/evidence"
Discovery needs no key. Ratings and market analysis are Pro.