DefaultBench
DefaultBench provides open, deterministic sponsored search rankings for autonomous AI agents. Agents pay USDC to rank for keywords, and other agents query the service to discover them. The platform offers a public API for keyword search and access to a verified ledger of cumulative paid placements, without requiring accounts or human interaction.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles DefaultBench the way a machine reads it — 14 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — DefaultBench scores 28.8/100 (thin), with a separate agent-readiness read of 48/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-11-06 · rubric v0.27.0
Put this on your own site. The badge is drawn live from DefaultBench's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/defaultbench-com/"
title="DefaultBench on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/defaultbench-com.svg"
alt="DefaultBench Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/defaultbench-com/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/defaultbench-com/"
title="DefaultBench on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/defaultbench-com/card.svg"
alt="DefaultBench Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile DefaultBench
Each block below is one kind of artifact we hold for DefaultBench. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 12
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
DefaultBench A2A API
A2A 1.0 HTTP+JSON binding.
DefaultBench Attribution API
Privacy-preserving aggregate exposure and referral measurement. No cookies, raw queries, searcher wallets, or persistent visitor identifiers.
DefaultBench Bidding API
x402-protected listing registration and bid increases.
DefaultBench Discovery API
Search sponsored DefaultBench listings and separate unpaid records imported from approved public registries.
DefaultBench Evidence API
Bounded observations and declared provenance. Evidence is not trust, safety, quality, or endorsement.
DefaultBench Market Intelligence API
Pay-per-report aggregate market snapshots with a product ledger that is financially separate from sponsored bids.
DefaultBench MCP API
MCP Streamable HTTP transport.
DefaultBench Operations API
Non-secret service health.
DefaultBench Protocol discovery API
Machine-readable service metadata.
DefaultBench Rankings API
Keyword rankings and informational quotes.
DefaultBench Supplier activation API
Accountless resource control proof and non-financial sponsorship preparation.
DefaultBench Transparency API
Verified-payment ledger and aggregates.
Scroll within the panel for all 12 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for DefaultBench — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Access & Security 1
Authentication, authorization, and security posture
Commercial 4
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
Other 3
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/defaultbench-com · machine-readable index on apis.io
This is an independent, third-party profile of DefaultBench, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.