A2A

A2A Persistent Memory Protocol provides a self‑hosted, client‑encrypted storage service where every operation is metered and paid per request via x402 payments on Base. No accounts or API keys are required; users encrypt data locally and the server stores only ciphertext. The platform offers storage, retrieval, TTL extension, and key sharing, with revenue split between creators and the protocol. Detailed pricing, legal terms, and status are publicly available.

A2A publishes 9 API contracts indexed on the APIs.io network, including Account API, Auth API, Billing API, and 6 more. Tagged areas include Company, Persistent-Memory, MCP, Payments, and Encryption.

The A2A catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

A2A’s developer surface includes API reference and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.0/100 emerging ▬ flat Agent 26/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessOpen

1 published contract

CompanyPersistent-MemoryMCP Payments Encryption Storage

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 24.0/100 · emerging

Contract Quality 10.1 / 21

Developer Ergonomics 1.7 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.3 / 9

Regulatory Posture 2.0 / 15

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 10.0 — up to +18.0 composite points
Access Clarity scores 10.5 — up to +17.9 composite points
Contract Quality scores 47.5 — up to +13.1 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/agtrepo-com/apis.yml: open an issue on github.com/api-evangelist/agtrepo-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

A2A Persistent Memory API

Encrypted, pay-per-use persistent memory storage for AI agents and humans.

A2A Account API

Profile, credit balance, and key-request inbox (session-gated)

A2A Auth API

Wallet-connect login (challenge/response), for the human-facing site

A2A Billing API

Stripe credit purchase for humans without crypto

A2A Discovery API

Machine-readable service metadata

A2A Feedback API

Named or anonymous feedback, delivered by email

A2A Key Requests API

Request/approve/deny access to a private memory's content key

A2A Memory API

Store, read, extend, and share encrypted memories

A2A Search API

Tag-based document search, creator search, and the top-creators leaderboard

Scroll for all 9

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Agtrepo Com Context

1 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

A2A API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Agtrepo Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Agtrepo Com Agentic Access

28 operations · 16 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: agtrepo-com
name: A2A
description: A2A Persistent Memory Protocol provides a self‑hosted, client‑encrypted storage service where every operation
  is metered and paid per request via x402 payments on Base. No accounts or API keys are required; users encrypt data locally
  and the server stores only ciphertext. The platform offers storage, retrieval, TTL extension, and key sharing, with revenue
  split between creators and the protocol. Detailed pricing, legal terms, and status are publicly available.
url: https://artifacts.apis.io/agtrepo-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Company
- Persistent-Memory
- MCP
- Payments
- Encryption
- Storage
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/agtrepo-com-agentic-access.yml
- type: Spectral
  url: rules/agtrepo-com-rules.yml
- type: JSONLD
  url: json-ld/agtrepo-com-context.jsonld
- type: Vocabulary
  url: vocabulary/agtrepo-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/agtrepo-com-data-model.yml
- type: ErrorCatalog
  url: errors/agtrepo-com-problem-types.yml
- type: Conformance
  url: conformance/agtrepo-com-conformance.yml
- type: LLMsTxt
  url: llms/agtrepo-com-llms.txt
- type: WellKnown
  url: well-known/agtrepo-com-well-known.yml
- type: Hosts
  url: hosts/agtrepo-com-hosts.yml
- type: Vendors
  url: vendors/agtrepo-com-vendors.yml
- type: DomainSecurity
  url: security/agtrepo-com-domain-security.yml
- type: Website
  url: https://agtrepo.com/
- type: APIReference
  url: https://agtrepo.com/openapi.json
- type: TermsOfService
  url: https://agtrepo.com/legal
- type: PrivacyPolicy
  url: https://agtrepo.com/privacy
apis:
- name: A2A Persistent Memory API
  description: Encrypted, pay-per-use persistent memory storage for AI agents and humans.
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  openAPI:
    url: openapi/agtrepo-com-openapi.json
    type: OpenAPI
  aid: agtrepo-com:a2a-persistent-memory-api
- aid: agtrepo-com:agtrepo-com-account-api
  name: A2A Account API
  description: Profile, credit balance, and key-request inbox (session-gated)
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Account
  tags_raw:
  - account
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-account-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-auth-api
  name: A2A Auth API
  description: Wallet-connect login (challenge/response), for the human-facing site
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Authentication
  tags_raw:
  - auth
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-auth-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-billing-api
  name: A2A Billing API
  description: Stripe credit purchase for humans without crypto
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Billing
  tags_raw:
  - billing
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-billing-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-discovery-api
  name: A2A Discovery API
  description: Machine-readable service metadata
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Discovery
  tags_raw:
  - discovery
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-discovery-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-feedback-api
  name: A2A Feedback API
  description: Named or anonymous feedback, delivered by email
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Feedback
  tags_raw:
  - feedback
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-feedback-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-key-requests-api
  name: A2A Key Requests API
  description: Request/approve/deny access to a private memory's content key
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - key-requests
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-key-requests-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-memory-api
  name: A2A Memory API
  description: Store, read, extend, and share encrypted memories
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Memory
  tags_raw:
  - memory
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-memory-api-openapi.yml
- aid: agtrepo-com:agtrepo-com-search-api
  name: A2A Search API
  description: Tag-based document search, creator search, and the top-creators leaderboard
  humanURL: https://agtrepo.com/
  baseURL: https://agtrepo.com
  tags:
  - Search
  tags_raw:
  - search
  properties:
  - type: OpenAPI
    url: openapi/agtrepo-com-search-api-openapi.yml
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

A2A API — frequently asked questions

Does A2A have an API?

Yes. APIs.io lists 9 APIs from A2A, including A2A Persistent Memory API, A2A Account API and A2A Auth API, and 6 more.

Is there an OpenAPI specification for the A2A API?

Yes. APIs.io indexes 8 OpenAPI specifications for A2A, each linked for download from this page.

Is the A2A API ready for AI agents?

A2A has a Kin Score of 24.0 out of 100 (emerging) and an Agent Readiness score of 25.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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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.
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