DELTA Witness — Trust Layer for Autonomous Actions

Machine-verifiable capture and preflight verification of public web sources. Returns timestamped content hashes plus a public verifier, keeping raw capture artifacts private. Access is payment-gated via the x402 v2 protocol using USDC on Base mainnet. Proves observation and change, not truth.

DELTA Witness — Trust Layer for Autonomous Actions publishes 10 API contracts indexed on the APIs.io network, including browser verification API, Capture API, Demo API, and 7 more. Tagged areas include web-verification, proof-of-observation, page-state-monitoring, content-hashing, and agent-guardrails.

The DELTA Witness — Trust Layer for Autonomous Actions catalog on APIs.io includes 1 Spectral governance ruleset.

DELTA Witness — Trust Layer for Autonomous Actions’ developer surface includes authentication and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.2/100 thin ▬ flat Agent 37/100 agent ready Front door AI 1/6 silent Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

2 published contracts 1 MCP Servers 3 Agent Skills

web-verificationproof-of-observationpage-state-monitoringcontent-hashingagent-guardrailspreflight-checksx402 PaymentsPay-per-use base-usdc Autonomous Agents MCP A2A Agent Skills Trust and Safety

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 31.2/100 · thin

Contract Quality 9.0 / 19

Developer Ergonomics 6.0 / 15

Access Clarity 3.8 / 15

Operational Transparency 0.5 / 10

Contract Governance 1.2 / 9

Discoverability 4.5 / 8

Regulatory Posture 1.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified) Ask about this →

3 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 25.5 — up to +14.9 composite points Ask about this →
Contract Quality scores 48.1 — up to +13.0 composite points Ask about this →
Operational Transparency scores 4.8 — up to +12.4 composite points Ask about this →

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.

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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/delta-witness/apis.yml: open an issue on github.com/api-evangelist/delta-witness 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
x402 Micropayments & Agentic Pay-per-Call	undeclared	-	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 4

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.

Agent Skills

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

Agent2Agent

measured — observed by APIs.io (flavored)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 10

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

DELTA Witness — Trust Layer for Autonomous Actions browser verification API

The browser verification API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for browser verification.

DELTA Witness — Trust Layer for Autonomous Actions Capture API

The Capture API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for capture.

DELTA Witness — Trust Layer for Autonomous Actions Demo API

The Demo API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for demo.

DELTA Witness — Trust Layer for Autonomous Actions Guarded Action Pilot API

The guarded-action-pilot API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for guarded-action-pilot.

DELTA Witness — Trust Layer for Autonomous Actions Health API

The Health API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for health.

DELTA Witness — Trust Layer for Autonomous Actions Preflight API

The Preflight API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for preflight.

DELTA Witness — Trust Layer for Autonomous Actions preflight autonomous action API

The preflight autonomous action API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for preflight autonomous action.

DELTA Witness — Trust Layer for Autonomous Actions Proofs API

The Proofs API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for proofs.

DELTA Witness — Trust Layer for Autonomous Actions Quote API

The Quote API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for quote.

DELTA Witness — Trust Layer for Autonomous Actions Watch API

The Watch API from DELTA Witness — Trust Layer for Autonomous Actions — 2 operation(s) for watch.

Scroll for all 10

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

DELTA Witness MCP

First-party MCP server exposing the paid DELTA Witness Capture and Guard (preflight) tools for public-source observation before autonomous actions.

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

delta-witness-guarded-action-pilot

AGENT SKILL

delta-witness-preflight-guard

AGENT SKILL

delta-witness

AGENT SKILL

DELTA Witness — Trust Layer for Autonomous Actions API pricing

Prices published by DELTA Witness — Trust Layer for Autonomous Actions.

Plan	Price
Capture	$1 per call
Preflight (Guard)	$5 per call
Guarded-Action Pilot	$10

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

DELTA Witness — Trust Layer for Autonomous Actions Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

DELTA Witness — Trust Layer for Autonomous Actions Rate Limits

0 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

DELTA Witness — Trust Layer for Autonomous Actions API Rules

47 rules · 45 error-severity 1 warn-severity 1 info-severity

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

DELTA Witness — Trust Layer for Autonomous Actions Openapi Overlay

4 actions · update

GENERATED

Security Posture 2

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

DELTA Witness — Trust Layer for Autonomous Actions Authentication

2 schemes

SECURITY

DELTA Witness — Trust Layer for Autonomous Actions Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

MCPServer

WellKnown

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

Idempotency

Build 4

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

ToolCrosswalk

ToolCrosswalk

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 1

Pricing, plans, and the legal terms of use

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

AgentCard

AgentCard

Overlay

Overlay

Source (apis.yml)

name: DELTA Witness — Trust Layer for Autonomous Actions
description: Machine-verifiable capture and preflight verification of public web sources. Returns timestamped content hashes
  plus a public verifier, keeping raw capture artifacts private. Access is payment-gated via the x402 v2 protocol using USDC
  on Base mainnet. Proves observation and change, not truth.
url: https://raw.githubusercontent.com/api-evangelist/delta-witness/refs/heads/main/apis.yml
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
created: '2026-09-11'
modified: '2026-09-11'
specificationVersion: '0.21'
tags:
- web-verification
- proof-of-observation
- page-state-monitoring
- content-hashing
- agent-guardrails
- preflight-checks
- x402 Payments
- Pay-per-use
- base-usdc
- Autonomous Agents
- MCP
- A2A
- Agent Skills
- Trust and Safety
tags_raw:
- web-verification
- proof-of-observation
- page-state-monitoring
- content-hashing
- agent-guardrails
- preflight-checks
- x402-payments
- pay-per-use
- base-usdc
- autonomous-agents
- mcp
- a2a
- agent-skill
- trust-and-safety
apis:
- aid: delta-witness:delta-witness-browser-verification-api
  name: DELTA Witness — Trust Layer for Autonomous Actions browser verification API
  description: The browser verification API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for browser
    verification.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  tags:
  - browser verification
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-browser-verification-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-capture-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Capture API
  description: The Capture API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for capture.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  baseURL: https://delta-witness-partner-gateway.ruphussten.workers.dev
  tags:
  - Capture
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-capture-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-demo-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Demo API
  description: The Demo API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for demo.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  tags:
  - Demo
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-demo-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-guarded-action-pilot-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Guarded Action Pilot API
  description: The guarded-action-pilot API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for guarded-action-pilot.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  tags:
  - guarded-action-pilot
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-guarded-action-pilot-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-health-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Health API
  description: The Health API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for health.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  baseURL: https://delta-witness-partner-gateway.ruphussten.workers.dev
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-health-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-preflight-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Preflight API
  description: The Preflight API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for preflight.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  baseURL: https://delta-witness-partner-gateway.ruphussten.workers.dev
  tags:
  - Preflight
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-preflight-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-preflight-autonomous-action-api
  name: DELTA Witness — Trust Layer for Autonomous Actions preflight autonomous action API
  description: The preflight autonomous action API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s)
    for preflight autonomous action.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  tags:
  - preflight autonomous action
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-preflight-autonomous-action-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-proofs-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Proofs API
  description: The Proofs API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for proofs.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  tags:
  - Proofs
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-proofs-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-quote-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Quote API
  description: The Quote API from DELTA Witness — Trust Layer for Autonomous Actions — 1 operation(s) for quote.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  tags:
  - Quotes
  tags_raw:
  - Quote
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-quote-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
- aid: delta-witness:delta-witness-watch-api
  name: DELTA Witness — Trust Layer for Autonomous Actions Watch API
  description: The Watch API from DELTA Witness — Trust Layer for Autonomous Actions — 2 operation(s) for watch.
  humanURL: https://delta-witness-api.ruphussten.workers.dev/docs
  baseURL: https://delta-witness-partner-gateway.ruphussten.workers.dev
  tags:
  - Watch
  properties:
  - type: OpenAPI
    url: openapi/delta-witness-watch-api-openapi.yml
  - type: PostmanCollection
    url: https://delta-witness-api.ruphussten.workers.dev/postman.json
  - type: Documentation
    url: https://delta-witness-api.ruphussten.workers.dev/docs
  - type: LLMsTxt
    url: https://delta-witness-api.ruphussten.workers.dev/llms.txt
maintainers:
- FN: DELTA Witness
  email: ruphussten@163.com
  url: https://delta-witness-api.ruphussten.workers.dev
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 95
  at: '2026-09-11T15:17:37.825Z'
common:
- type: AgentSkill
  url: https://delta-witness-api.ruphussten.workers.dev/SKILL.md
- type: Website
  url: https://delta-witness-api.ruphussten.workers.dev
- type: DomainSecurity
  url: security/delta-witness-domain-security.yml
- type: SDKs
  url: packages/delta-witness-packages.yml
- type: Packages
  url: packages/delta-witness-packages.yml
- type: MCPServer
  url: mcp/delta-witness-mcp.yml
- type: ToolCrosswalk
  url: mcp/delta-witness-tool-crosswalk.yml
- type: AgentCard
  url: a2a/delta-witness-a2a.yml
- type: WellKnown
  url: well-known/delta-witness-well-known.yml
- type: Overlay
  url: overlays/delta-witness-openapi-overlay.yaml
- type: Conformance
  url: conformance/delta-witness-conformance.yml
- type: ErrorCatalog
  url: errors/delta-witness-problem-types.yml
- type: Lifecycle
  url: lifecycle/delta-witness-lifecycle.yml
- type: Authentication
  url: authentication/delta-witness-authentication.yml
- type: Conventions
  url: conventions/delta-witness-conventions.yml
- type: Idempotency
  url: conventions/delta-witness-conventions.yml
- type: Plans
  url: plans/delta-witness-plans-pricing.yml
- type: RateLimits
  url: rate-limits/delta-witness-rate-limits.yml
- type: AgentSkill
  url: skills/_index.yml
- type: GitHubOrganization
  url: https://github.com/15998194110/delta-witness
x-enrichment:
  date: '2026-09-11'
  status: enriched
  artifacts_added: 18
  pass: local-v3

DELTA Witness — Trust Layer for Autonomous Actions API — frequently asked questions

Does DELTA Witness — Trust Layer for Autonomous Actions have an API?

Yes. APIs.io lists 10 APIs from DELTA Witness — Trust Layer for Autonomous Actions, including DELTA Witness — Trust Layer for Autonomous Actions browser verification API, DELTA Witness — Trust Layer for Autonomous Actions Capture API and DELTA Witness — Trust Layer for Autonomous Actions Demo API, and 7 more.

Is there an OpenAPI specification for the DELTA Witness — Trust Layer for Autonomous Actions API?

Yes. APIs.io indexes 10 OpenAPI specifications for DELTA Witness — Trust Layer for Autonomous Actions, each linked for download from this page.

How do I authenticate with the DELTA Witness — Trust Layer for Autonomous Actions API?

DELTA Witness — Trust Layer for Autonomous Actions uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as DELTA Witness — Trust Layer for Autonomous Actions Authentication.

How much does the DELTA Witness — Trust Layer for Autonomous Actions API cost?

DELTA Witness — Trust Layer for Autonomous Actions publishes its prices; its Capture plan is $1 per call as of 2026-09-11. APIs.io lists 3 pricing plans for DELTA Witness — Trust Layer for Autonomous Actions, with each plan's price, limits and inclusions under Pricing on this page.

Does DELTA Witness — Trust Layer for Autonomous Actions have an MCP server?

Yes. APIs.io lists 1 MCP server for DELTA Witness — Trust Layer for Autonomous Actions: First-party MCP server exposing the paid DELTA Witness Capture and Guard (preflight) tools for public-source observation before autonomous actions.

Is the DELTA Witness — Trust Layer for Autonomous Actions API ready for AI agents?

DELTA Witness — Trust Layer for Autonomous Actions has a Kin Score of 31.2 out of 100 (thin) and an Agent Readiness score of 36.8 (agent-ready), scored by API Evangelist on 2026-11-13.

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