Halliday

aid: halliday
name: Halliday
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/halliday/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://halliday.xyz/opengraph-image
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: profiled
x-tier-reason: enriched-from-portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Payments
- Cryptocurrency
- Blockchain
- Web3
- Onramp
- Swaps
- DeFi
- Agentic Workflows
- Fintech
apis:
- aid: halliday:halliday-assets-api
  name: Halliday Assets API
  description: Asset information, discovery, and supported asset pairs
  humanURL: https://docs.halliday.xyz
  baseURL: https://v2.prod.halliday.xyz
  tags:
  - Assets
  properties:
  - type: OpenAPI
    url: openapi/halliday-assets-api-openapi.yml
  - type: Documentation
    url: https://docs.halliday.xyz
  - type: APIReference
    url: https://docs.halliday.xyz/pages/halliday-api-docs.md
  - type: GettingStarted
    url: https://docs.halliday.xyz/pages/api-quickstart.md
- aid: halliday:halliday-chains-api
  name: Halliday Chains API
  description: Blockchain network information and configuration
  humanURL: https://docs.halliday.xyz
  baseURL: https://v2.prod.halliday.xyz
  tags:
  - Chains
  properties:
  - type: OpenAPI
    url: openapi/halliday-chains-api-openapi.yml
  - type: Documentation
    url: https://docs.halliday.xyz
  - type: APIReference
    url: https://docs.halliday.xyz/pages/halliday-api-docs.md
  - type: GettingStarted
    url: https://docs.halliday.xyz/pages/api-quickstart.md
- aid: halliday:halliday-payments-api
  name: Halliday Payments API
  description: Core payment operations including quotes, confirmation, and status tracking
  humanURL: https://docs.halliday.xyz
  baseURL: https://v2.prod.halliday.xyz
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/halliday-payments-api-openapi.yml
  - type: Documentation
    url: https://docs.halliday.xyz
  - type: APIReference
    url: https://docs.halliday.xyz/pages/halliday-api-docs.md
  - type: GettingStarted
    url: https://docs.halliday.xyz/pages/api-quickstart.md
- aid: halliday:halliday-webhooks-api
  name: Halliday Webhooks API
  description: '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 webhook.


    | Event type | Fires when a workflow''s status becomes |

    | --- | --- |

    | `WORKFLOW_COMPLETED` | `COMPLETE` |

    | `WORKFLOW_FAILED` | `FAILED` |


    All management endpoints live under `/orgs/webhooks` and authenticate with a secret API key

    (passed as a bearer token) that has webhook access. Publishable keys cannot manage webhooks.


    **Integration checklist**


    - Receiver is a public HTTPS endpoint (no private IPs).

    - Save the `signing_secret` when you create the webhook — it is shown only once.

    - Verify `X-Halliday-Signature` against the raw body, accepting any of its comma-separated signatures.

    - Respond `2xx` quickly and do the real work afterward.

    - Skip deliveries whose `id` you have already handled.'
  humanURL: https://docs.halliday.xyz
  baseURL: https://v2.prod.halliday.xyz
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/halliday-webhooks-api-openapi.yml
  - type: Documentation
    url: https://docs.halliday.xyz
  - type: APIReference
    url: https://docs.halliday.xyz/pages/halliday-api-docs.md
  - type: GettingStarted
    url: https://docs.halliday.xyz/pages/api-quickstart.md
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: OpenAPI
  url: openapi/_original/halliday-openapi-original.yml
- type: DeveloperPortal
  url: https://docs.halliday.xyz
- type: Documentation
  url: https://docs.halliday.xyz
- type: APIReference
  url: https://docs.halliday.xyz/pages/halliday-api-docs.md
- type: GettingStarted
  url: https://docs.halliday.xyz/pages/api-quickstart.md
- type: Support
  url: https://halliday.xyz/contact
- type: Blog
  url: https://blog.halliday.xyz
- type: GitHubOrganization
  url: https://github.com/HallidayInc
- type: SignUp
  url: https://dashboard.halliday.xyz/
- type: TermsOfService
  url: https://halliday.xyz/legal/terms-of-use
- type: PrivacyPolicy
  url: https://halliday.xyz/legal/privacy-policy
- type: Sandbox
  url: https://demo.halliday.xyz/
- type: Compliance
  url: https://docs.halliday.xyz/pages/compliance-security.md
- type: Authentication
  url: authentication/halliday-authentication.yml
- type: AgenticAccess
  url: agentic-access/halliday-agentic-access.yml
- type: DomainSecurity
  url: security/halliday-domain-security.yml
- type: Packages
  url: packages/halliday-packages.yml
- type: SDKs
  url: packages/halliday-packages.yml
- type: MCPServer
  url: mcp/halliday-mcp.yml
- type: LLMsTxt
  url: llms/halliday-llms.txt
- type: Overlay
  url: overlays/halliday-openapi-overlay.yaml
- type: Conformance
  url: conformance/halliday-conformance.yml
- type: ErrorCatalog
  url: errors/halliday-problem-types.yml
- type: Lifecycle
  url: lifecycle/halliday-lifecycle.yml
- type: Conventions
  url: conventions/halliday-conventions.yml
- type: Components
  url: components/halliday-components.yml
- type: DataModel
  url: data-model/halliday-data-model.yml
- type: Webhooks
  url: asyncapi/halliday-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence