Pay-i

Pay-i is a GenAI cost, capacity and ROI optimization platform founded by Microsoft veterans. It instruments generative-AI applications so enterprises can prove the business value of their AI spend. Pay-i exposes a REST API at api.pay-i.com built around three surfaces: a metering proxy that fronts OpenAI, Azure OpenAI, Anthropic, Azure Anthropic, AWS Bedrock and Google Vertex and records cost, latency and failure metadata for every inference request; an ingest API for submitting events from providers Pay-i does not proxy; and a management API covering Limits (spend budgets with risk thresholds and blocking states), Use Cases and their versions and instances, KPIs and value policies, Categories and Resources for model and price catalogs, and Reports. Instrumentation is driven by a family of xProxy-* request headers and first-party Python and TypeScript SDKs, plus an n8n community node and a Databricks integration.

Pay-i publishes 14 APIs on the APIs.io network, including Anthropic Requests API, AWS Bedrock Requests API, Azure Anthropic Requests API, and 11 more. Tagged areas include Company, Artificial Intelligence, FinOps, Observability, and Cost Management.

Pay-i’s developer surface includes documentation, API reference, getting-started guide, signup flow, engineering blog, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.0/100 thin ▬ flat Agent 31/100 agent ready saas Full breakdown ↓
scored 2026-09-02 · rubric v0.18.0

AccessSelf serve

2 APIs 1 MCP Servers

Company Artificial Intelligence FinOps Observability Cost Management Generative AI LLM Analytics Governance Metering

Kin Score

Kin Score How this is scored →
scored 2026-09-02 · rubric v0.18.0

Composite quality — 38.0/100 · thin

Contract Quality 13.3 / 25

Developer Ergonomics 9.4 / 20

Access Clarity 6.8 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.5 / 12

Discoverability 7.6 / 10

Agent readiness — 31/100 · 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 0 / 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 0 / 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 Surface 0 / 5

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 github.com/api-evangelist/pay-i: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 14

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

MCP Servers 1

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

Rate Limits 1

Documented rate limits and quota policies.

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

ErrorCatalog

ErrorCatalog

Lifecycle

Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

ToolCrosswalk

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: pay-i
name: Pay-i
description: 'Pay-i is a GenAI cost, capacity and ROI optimization platform founded by Microsoft veterans. It instruments
  generative-AI applications so enterprises can prove the business value of their AI spend. Pay-i exposes a REST API at api.pay-i.com
  built around three surfaces: a metering proxy that fronts OpenAI, Azure OpenAI, Anthropic, Azure Anthropic, AWS Bedrock
  and Google Vertex and records cost, latency and failure metadata for every inference request; an ingest API for submitting
  events from providers Pay-i does not proxy; and a management API covering Limits (spend budgets with risk thresholds and
  blocking states), Use Cases and their versions and instances, KPIs and value policies, Categories and Resources for model
  and price catalogs, and Reports. Instrumentation is driven by a family of xProxy-* request headers and first-party Python
  and TypeScript SDKs, plus an n8n community node and a Databricks integration.'
url: https://raw.githubusercontent.com/api-evangelist/pay-i/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://cdn.prod.website-files.com/698b13d019d0be64f91a6ae7/69a72aad61995c2a45243b2e_open-graph.png
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-26'
modified: '2026-08-26'
tags:
- Company
- Artificial Intelligence
- FinOps
- Observability
- Cost Management
- Generative AI
- LLM
- Analytics
- Governance
- Metering
apis:
- aid: pay-i:pay-i-anthropic-requests-api
  name: Pay-i Anthropic Requests API
  description: Anthropic Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Anthropic Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-anthropic-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-aws-bedrock-requests-api
  name: Pay-i AWS Bedrock Requests API
  description: AWS Bedrock Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - AWS Bedrock Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-aws-bedrock-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-azure-anthropic-requests-api
  name: Pay-i Azure Anthropic Requests API
  description: Azure Anthropic Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Azure Anthropic Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-azure-anthropic-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-azure-openai-requests-api
  name: Pay-i Azure OpenAI Requests API
  description: Azure OpenAI Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Azure OpenAI Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-azure-openai-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-categories-api
  name: Pay-i Categories API
  description: System and Custom Categories
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Categories
  properties:
  - type: OpenAPI
    url: openapi/pay-i-categories-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-google-vertex-requests-api
  name: Pay-i Google Vertex Requests API
  description: Google Vertex Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Google Vertex Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-google-vertex-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-ingest-events-api
  name: Pay-i Ingest Events API
  description: Ingest Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Ingest Events
  properties:
  - type: OpenAPI
    url: openapi/pay-i-ingest-events-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-kpis-api
  name: Pay-i KP Is API
  description: KPIs
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - KPIs
  properties:
  - type: OpenAPI
    url: openapi/pay-i-kpis-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-limits-api
  name: Pay-i Limits API
  description: Limits
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Limits
  properties:
  - type: OpenAPI
    url: openapi/pay-i-limits-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-openai-requests-api
  name: Pay-i OpenAI Requests API
  description: OpenAI Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - OpenAI Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-openai-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-reports-api
  name: Pay-i Reports API
  description: Public API for retrieving reports.
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Reports
  properties:
  - type: OpenAPI
    url: openapi/pay-i-reports-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-requests-api
  name: Pay-i Requests API
  description: Requests
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Requests
  properties:
  - type: OpenAPI
    url: openapi/pay-i-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-resources-api
  name: Pay-i Resources API
  description: Resources
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Resources
  properties:
  - type: OpenAPI
    url: openapi/pay-i-resources-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
- aid: pay-i:pay-i-use-cases-api
  name: Pay-i Use Cases API
  description: Use Cases
  humanURL: https://docs.pay-i.com/reference/getlimits
  baseURL: https://api.pay-i.com
  tags:
  - Use Cases
  properties:
  - type: OpenAPI
    url: openapi/pay-i-use-cases-api-openapi.yml
  - type: Documentation
    url: https://docs.pay-i.com/docs/getting-started
  - type: APIReference
    url: https://docs.pay-i.com/reference/getlimits
  - type: Authentication
    url: authentication/pay-i-authentication.yml
  - type: ErrorCatalog
    url: errors/pay-i-problem-types.yml
  - type: DataModel
    url: data-model/pay-i-data-model.yml
  - type: Conventions
    url: conventions/pay-i-conventions.yml
  - type: RateLimits
    url: rate-limits/pay-i-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/pay-i-openapi-overlay.yaml
- type: Website
  url: https://www.pay-i.com/
- type: DeveloperPortal
  url: https://developer.pay-i.com
- type: Documentation
  url: https://docs.pay-i.com/docs/getting-started
- type: APIReference
  url: https://docs.pay-i.com/reference/getlimits
- type: GettingStarted
  url: https://docs.pay-i.com/docs/getting-started
- type: SignUp
  url: https://developer.pay-i.com/login
- type: TermsOfService
  url: https://www.pay-i.com/tos
- type: PrivacyPolicy
  url: https://www.pay-i.com/privacy
- type: GitHubOrganization
  url: https://github.com/Pay-i
- type: Blog
  url: https://www.pay-i.com/resources
- type: Packages
  url: packages/pay-i-packages.yml
- type: SDKs
  url: packages/pay-i-packages.yml
- type: MCPServer
  url: mcp/pay-i-mcp.yml
- type: ToolCrosswalk
  url: mcp/pay-i-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/pay-i-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Conformance
  url: conformance/pay-i-conformance.yml
- type: ErrorCatalog
  url: errors/pay-i-error-codes.yml
- type: Lifecycle
  url: lifecycle/pay-i-lifecycle.yml
- type: DomainSecurity
  url: security/pay-i-domain-security.yml
- type: Plans
  url: plans/pay-i-plans-pricing.yml
- type: RateLimits
  url: rate-limits/pay-i-rate-limits.yml
x-enrichment:
  date: '2026-08-26'
  status: enriched
  artifacts_added: 20
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
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.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/pay-i"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/pay-i/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/pay-i/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.