# DELTA Witness — Trust Layer for Autonomous Actions

**Canonical:** https://apis.io/providers/delta-witness/  
**Website:** https://delta-witness-api.ruphussten.workers.dev  
**APIs profiled:** 2

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.

## Kin Score — 30.4 / 100 (thin)

Scored 2026-10-04 under rubric 0.23.0. Trend: flat (-2.4 from 32.8).

| Facet | Score |
|---|---|
| Discoverability | 60.0 |
| Contract Quality | 44.6 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 39.8 |
| Access Clarity | 31.6 |

Regulatory layer — **Payments**: 15.2 (matched via tags).

## Agent readiness — 35.5 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | documented |
| Error Semantics | derived |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | flavored |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## APIs (10)

- **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.

## MCP servers (1)

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

## Security (2)

- **Delta Witness Authentication** — 2 schemes
- **Delta Witness Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Delta Witness Plans Pricing**

## 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

---

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