Primer

Primer is a payment orchestration platform that enables merchants to build flexible payment flows across multiple processors through a single REST API integration. The platform provides intelligent routing, automatic fallback logic, fraud detection integrations, and a no-code Workflows builder for managing payment rules without engineering effort. Primer supports 60+ payment methods including cards, digital wallets, and regional alternatives such as iDEAL, Klarna, and Alipay. The platform delivers unified observability, reconciliation, and analytics across all connected payment providers, and processes billions of dollars monthly with 99.99% uptime.

Primer publishes 5 API contracts indexed on the APIs.io network, including Client Session API, Dispute & Chargebacks Webhooks API, Payment Methods API, and 2 more. Tagged areas include Payments, Payment Orchestration, Payment Processing, Fintech, and Fraud Prevention.

The Primer catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Primer’s developer surface includes authentication, documentation, engineering blog, pricing, changelog, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

41.3/100 developing ▬ flat Agent 36/100 agent ready Front door AI 3/6 light Heartbeat 80/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

2 published contracts

Payments Payment Orchestration Payment Processing Fintech Fraud Prevention Smart Routing Checkout Payment Methods Reconciliation Webhook

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Subscription Billing & Revenue Management

BC-4250

Payment Methods APIPayments API

Consumer Commerce

AE-140

Client Session API

POST /client-session

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 41.3/100 · developing

Contract Quality 10.4 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 3.6 / 15

Operational Transparency 5.1 / 10

Contract Governance 2.1 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 36/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 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 0 / 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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Agent Skills +5 pts — skills artifact present, graded by who authored it

5 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 23.7 — up to +15.3 composite points
Developer Ergonomics scores 32.1 — up to +13.6 composite points
Contract Quality scores 55.2 — up to +11.2 composite points

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.

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/primer/apis.yml: open an issue on github.com/api-evangelist/primer 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
Agent Skills (SKILL.md packages)	undeclared	-	-	1

Not yet checked against Primer's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure.

Plan	Price
Primer for Growth	—
Enterprise	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Primer Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Primer Rate Limits

3 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Primer

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Primer Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Primer Context

16 classes · 27 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Primer — jsonschema rules

6 rules · 4 warnings 2 info

SPECTRAL

1 fields

EXAMPLE

Scroll for all 27

Security Posture 4

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

Primer Authentication

apiKey · 1 scheme

SECURITY

Primer Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Primer Vulnerability Disclosure

no policy recorded

SECURITY

Primer Trust Center

SOC 2, ISO 27001

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Primer Agentic Access

20 operations · 16 acting

AGENTIC

Resources

Documentation 6

Reference material describing how the API behaves

Documentation

JSONSchema

JSONSchema

JSONSchema

JSONSchema

JSONSchema

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLDContext

JSONLDContext

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: primer
name: Primer
type: Index
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: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/primer.png
url: https://raw.githubusercontent.com/api-evangelist/primer/refs/heads/main/apis.yml
created: 2026-06-12
modified: '2026-09-16'
specificationVersion: '0.23'
description: 'Primer is a payment orchestration platform that enables merchants to build flexible payment flows across multiple
  processors through a single REST API integration. The platform provides intelligent routing, automatic fallback logic, fraud
  detection integrations, and a no-code Workflows builder for managing payment rules without engineering effort. Primer supports
  60+ payment methods including cards, digital wallets, and regional alternatives such as iDEAL, Klarna, and Alipay. The platform
  delivers unified observability, reconciliation, and analytics across all connected payment providers, and processes billions
  of dollars monthly with 99.99% uptime.

  '
tags:
- Payments
- Payment Orchestration
- Payment Processing
- Fintech
- Fraud Prevention
- Smart Routing
- Checkout
- Payment Methods
- Reconciliation
- Webhook
tags_raw:
- payments
- payment orchestration
- payment processing
- fintech
- fraud detection
- smart routing
- checkout
- payment methods
- reconciliation
- webhooks
- Fraud Detection
apis:
- aid: primer:primer-client-session-api-api
  name: Primer Client Session API
  description: The Client Session API API from Primer — 1 operation(s) for client session api.
  humanURL: https://primer.io/docs/api-reference/get-started/overview
  baseURL: https://api.primer.io
  tags:
  - Client Session API
  properties:
  - type: OpenAPI
    url: openapi/primer-client-session-api-api-openapi.yml
  - type: Documentation
    url: https://primer.io/docs/api-reference/get-started/overview
  - type: Sandbox
    url: https://api.sandbox.primer.io
- aid: primer:primer-dispute-chargebacks-webhooks-api
  name: Primer Dispute & Chargebacks Webhooks API
  description: The Dispute & Chargebacks Webhooks API from Primer — 2 operation(s) for dispute & chargebacks webhooks.
  humanURL: https://primer.io/docs/api-reference/get-started/overview
  baseURL: https://api.primer.io
  tags:
  - Dispute & Chargebacks Webhooks
  properties:
  - type: OpenAPI
    url: openapi/primer-dispute-chargebacks-webhooks-api-openapi.yml
  - type: Documentation
    url: https://primer.io/docs/api-reference/get-started/overview
  - type: Sandbox
    url: https://api.sandbox.primer.io
- aid: primer:primer-payment-methods-api-api
  name: Primer Payment Methods API
  description: The Payment Methods API API from Primer — 4 operation(s) for payment methods api.
  humanURL: https://primer.io/docs/api-reference/get-started/overview
  baseURL: https://api.primer.io
  tags:
  - Payment Methods API
  properties:
  - type: OpenAPI
    url: openapi/primer-payment-methods-api-api-openapi.yml
  - type: Documentation
    url: https://primer.io/docs/api-reference/get-started/overview
  - type: Sandbox
    url: https://api.sandbox.primer.io
- aid: primer:primer-payment-webhooks-api
  name: Primer Payment Webhooks API
  description: The Payment Webhooks API from Primer — 2 operation(s) for payment webhooks.
  humanURL: https://primer.io/docs/api-reference/get-started/overview
  baseURL: https://api.primer.io
  tags:
  - Payment Webhooks
  properties:
  - type: OpenAPI
    url: openapi/primer-payment-webhooks-api-openapi.yml
  - type: Documentation
    url: https://primer.io/docs/api-reference/get-started/overview
  - type: Sandbox
    url: https://api.sandbox.primer.io
- aid: primer:primer-payments-api-api
  name: Primer Payments API
  description: The Payments API API from Primer — 8 operation(s) for payments api.
  humanURL: https://primer.io/docs/api-reference/get-started/overview
  baseURL: https://api.primer.io
  tags:
  - Payments API
  properties:
  - type: OpenAPI
    url: openapi/primer-payments-api-api-openapi.yml
  - type: Documentation
    url: https://primer.io/docs/api-reference/get-started/overview
  - type: Sandbox
    url: https://api.sandbox.primer.io
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/primer/overview
- type: CapabilityMap
  url: capabilities/primer-capability-edges.yml
  name: Primer Business Capability Map
- type: AgenticAccess
  url: agentic-access/primer-agentic-access.yml
- type: TrustCenter
  url: security/primer-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/primer-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/primer-domain-security.yml
- type: Authentication
  url: authentication/primer-authentication.yml
- type: Website
  url: https://primer.io/
- type: Documentation
  url: https://primer.io/docs/api-reference/get-started/overview
- type: GitHubOrganization
  url: https://github.com/primer-io
- type: LinkedIn
  url: https://www.linkedin.com/company/primerapi/
- type: X
  url: https://x.com/primer_io
- type: Blog
  url: https://primer.io/blog
- type: Pricing
  url: https://primer.io/blog/primer-launches-primer-for-growth
- type: StatusPage
  url: https://status.primer.io/
- type: ChangeLog
  url: https://primer.io/docs/changelogs/android-sdk
- type: Plans
  url: plans/primer-plans-pricing.yml
- type: RateLimits
  url: rate-limits/primer-rate-limits.yml
- type: FinOps
  url: finops/primer-finops.yml
- type: JSONSchema
  url: json-schema/primer-clientsession.json
- type: JSONSchema
  url: json-schema/primer-paymentcreation.json
- type: JSONSchema
  url: json-schema/primer-payment.json
- type: JSONSchema
  url: json-schema/primer-paymentrefund.json
- type: JSONSchema
  url: json-schema/primer-paymentcapture.json
- type: Vocabulary
  url: vocabulary/primer-vocabulary.yml
- type: JSONLDContext
  url: json-ld/primer-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Primer API — frequently asked questions

Does Primer have an API?

Yes. APIs.io lists 5 APIs from Primer, including Primer Client Session API, Primer Dispute & Chargebacks Webhooks API and Primer Payment Methods API, and 2 more.

Is there an OpenAPI specification for the Primer API?

Yes. APIs.io indexes 5 OpenAPI specifications for Primer, each linked for download from this page.

How do I authenticate with the Primer API?

Primer uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Primer Authentication.

How much does the Primer API cost?

APIs.io lists 2 pricing plans for Primer, with each plan's price, limits and inclusions under Pricing on this page.

Is the Primer API ready for AI agents?

Primer has a Kin Score of 41.3 out of 100 (developing) and an Agent Readiness score of 36.2 (agent-ready), scored by API Evangelist on 2026-11-06.

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