# Halliday

**Canonical:** https://apis.io/providers/halliday/  
**Website:** https://docs.halliday.xyz  
**APIs profiled:** 1

Halliday is a web3 payments and agentic-workflow company (a16z crypto Series A) building the end-to-end onchain deposit platform. Its Agentic Workflow Protocol (AWP) lets developers compose high-level, AI-executable workflows behind immutable guardrails without writing smart-contract code. The flagship product, Halliday Payments, is a unified cross-chain payments API and drop-in widget that lets users onramp from fiat, bridge, and swap to acquire any asset on any chain in a fully self-custodial way, routing intelligently across onramps (MoonPay, Transak, Stripe), swaps, and bridges. The Halliday API V2 (https://v2.prod.halliday.xyz) exposes chains, assets, quotes, payments, balances, withdrawals, and signed workflow webhooks, authenticated with publishable API keys, alongside JS/React/React Native SDKs and a published Claude Code integration skill.

## Kin Score — 51.8 / 100 (developing)

Scored 2026-08-30 under rubric 0.17.2. Trend: flat (-0.6 from 52.4).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 71.9 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 73.8 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

Regulatory layer — **Payments**: 46.9 (matched via tags).

## Agent readiness — 36.0 (agent-ready)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (4)

- **Halliday Assets API** — Asset information, discovery, and supported asset pairs
- **Halliday Chains API** — Blockchain network information and configuration
- **Halliday Payments API** — Core payment operations including quotes, confirmation, and status tracking
- **Halliday Webhooks API** — Register HTTPS endpoints to receive signed notifications when a workflow reaches a terminal state, instead of polling for status. You subscribe to one or more event types per we...

## MCP servers (1)

- **Halliday MCP Server**

## Agentic access (1)

- **Halliday Agentic Access** — 16 operations · 9 acting

## Security (2)

- **Halliday Authentication** — http · 1 scheme
- **Halliday Domain Security** — TLSv1.3 · DMARC

## Tags

Company, Payments, Cryptocurrency, Blockchain, Web3, Onramp, Swaps, DeFi, Agentic Workflows, Fintech

---

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