51offer

51offer (Shanghai Huizhi Business Consulting Co., Ltd. / 上海汇紫商务咨询有限公司) is a Shanghai-based one-stop online study-abroad platform for Chinese students applying to universities in the United Kingdom, Australia, the United States, New Zealand, Japan and Singapore. Its consumer surface covers DIY application filing, AI/big-data school and course matching, personal-statement and document services, language training (IELTS/TOEFL), adviser and channel-partner services, a study-abroad mall with online contract signing, payment and refund flows, a GPA calculator and a student content and community section. 51offer publishes no developer program, but its official site www.51offer.com serves a public, unauthenticated Swagger 1.2 API listing at /api-docs ("Horizon Site APIConfig List / 51offer官网所有开放接口清单") describing 24 controllers and several hundred JSON operations, and that listing is the machine-readable contract profiled here.

51offer publishes 21 APIs on the APIs.io network, including Diym API, Ng Adviser API, Ng Alliance API, and 18 more. Tagged areas include Company, Education, Study Abroad, Higher Education, and University Applications.

51offer’s developer surface includes authentication, signup flow, support, engineering blog, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub

20.0/100 emerging ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

26 APIs

Company Education Study Abroad Higher EducationUniversity ApplicationsStudentsLanguage TrainingE-Commerce China Consulting

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 20.0/100 · emerging

Contract Quality 3.1 / 19

Developer Ergonomics 3.7 / 15

Access Clarity 2.6 / 15

Operational Transparency 0.3 / 10

Contract Governance 0.4 / 9

Discoverability 5.4 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 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 Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Education & Research 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/.

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/51offer: 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 21

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

51offer Diym API

diy材料申请信息控制层

51offer Ng Adviser API

顾问控制层

51offer Ng Alliance API

大总管服务控制层

51offer Ng Delivery Channel API

渠道限时兑换礼包相关控制层

51offer Ng Diy API

Diy服务控制层

51offer Ngdiyapplypay API

Diy申请支付服务控制

51offer Ngdiychoose School API

diy选校控制器

51offer Ngdiypositioningnotice API

diy定位通知服务

51offer Ngdiyselectschool API

Diy选校控制器前置

51offer Ngdiysinglepage API

diy单品页控制器

51offer Ng Double Twelve API

双十二活动服务控制层

51offer Ng Enroll API

Enroll Controller

51offer Ng Gpa Calc API

GPA计算器

51offer Ng Home API

H5首页控制层

51offer Ng Lan Correct API

语培口语批改

51offer Ng Mall API

商城控制层

51offer Ng Pay Coupon API

51品牌节支付优惠券

51offer Ng Pic API

文章图片更新控制层

51offer Ngrefund API

订单退款控制层

51offer Ng Sign API

Sign Controller

51offer Ng User Info API

runway用户控制层

Scroll for all 21

Pricing Plans 1

Published pricing tiers and plan structures.

51Offer Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

51Offer Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

51Offer Authentication

apiKey · 1 scheme

SECURITY

51Offer Domain Security

TLSv1.2

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

Login

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Conformance

Conformance

Lifecycle

Lifecycle

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 4

The organization behind the API

Website

About

Blog

Partners

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: 51offer
name: 51offer
description: 51offer (Shanghai Huizhi Business Consulting Co., Ltd. / 上海汇紫商务咨询有限公司) is a Shanghai-based one-stop online study-abroad
  platform for Chinese students applying to universities in the United Kingdom, Australia, the United States, New Zealand,
  Japan and Singapore. Its consumer surface covers DIY application filing, AI/big-data school and course matching, personal-statement
  and document services, language training (IELTS/TOEFL), adviser and channel-partner services, a study-abroad mall with online
  contract signing, payment and refund flows, a GPA calculator and a student content and community section. 51offer publishes
  no developer program, but its official site www.51offer.com serves a public, unauthenticated Swagger 1.2 API listing at
  /api-docs ("Horizon Site APIConfig List / 51offer官网所有开放接口清单") describing 24 controllers and several hundred JSON operations,
  and that listing is the machine-readable contract profiled here.
image: https://static.51offer.com/skin/common/images/favicon.ico
url: https://raw.githubusercontent.com/api-evangelist/51offer/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-09-05'
modified: '2026-09-05'
tags:
- Company
- Education
- Study Abroad
- Higher Education
- University Applications
- Students
- Language Training
- E-Commerce
- China
- Consulting
apis:
- aid: 51offer:51offer-diym-api
  name: 51offer Diym API
  description: diy材料申请信息控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - diym
  properties:
  - type: OpenAPI
    url: openapi/51offer-diym-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngadviser-api
  name: 51offer Ng Adviser API
  description: 顾问控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngAdviser
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngadviser-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngalliance-api
  name: 51offer Ng Alliance API
  description: 大总管服务控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngAlliance
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngalliance-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdeliverychannel-api
  name: 51offer Ng Delivery Channel API
  description: 渠道限时兑换礼包相关控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngDeliveryChannel
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdeliverychannel-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdiy-api
  name: 51offer Ng Diy API
  description: Diy服务控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngDiy
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdiy-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdiyapplypay-api
  name: 51offer Ngdiyapplypay API
  description: Diy申请支付服务控制
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngdiyapplypay
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdiyapplypay-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdiychooseschool-api
  name: 51offer Ngdiychoose School API
  description: diy选校控制器
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags: []
  tags_raw:
  - ngdiychooseSchool
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdiychooseschool-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdiypositioningnotice-api
  name: 51offer Ngdiypositioningnotice API
  description: diy定位通知服务
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngdiypositioningnotice
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdiypositioningnotice-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdiyselectschool-api
  name: 51offer Ngdiyselectschool API
  description: Diy选校控制器前置
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngdiyselectschool
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdiyselectschool-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdiysinglepage-api
  name: 51offer Ngdiysinglepage API
  description: diy单品页控制器
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngdiysinglepage
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdiysinglepage-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngdoubletwelve-api
  name: 51offer Ng Double Twelve API
  description: 双十二活动服务控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngDoubleTwelve
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngdoubletwelve-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngenroll-api
  name: 51offer Ng Enroll API
  description: Enroll Controller
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngEnroll
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngenroll-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-nggpacalc-api
  name: 51offer Ng Gpa Calc API
  description: GPA计算器
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngGpaCalc
  properties:
  - type: OpenAPI
    url: openapi/51offer-nggpacalc-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-nghome-api
  name: 51offer Ng Home API
  description: H5首页控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngHome
  properties:
  - type: OpenAPI
    url: openapi/51offer-nghome-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-nglancorrect-api
  name: 51offer Ng Lan Correct API
  description: 语培口语批改
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngLanCorrect
  properties:
  - type: OpenAPI
    url: openapi/51offer-nglancorrect-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngmall-api
  name: 51offer Ng Mall API
  description: 商城控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngMall
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngmall-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngpaycoupon-api
  name: 51offer Ng Pay Coupon API
  description: 51品牌节支付优惠券
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngPayCoupon
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngpaycoupon-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngpic-api
  name: 51offer Ng Pic API
  description: 文章图片更新控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngPic
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngpic-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngrefund-api
  name: 51offer Ngrefund API
  description: 订单退款控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngrefund
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngrefund-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-ngsign-api
  name: 51offer Ng Sign API
  description: Sign Controller
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngSign
  properties:
  - type: OpenAPI
    url: openapi/51offer-ngsign-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
- aid: 51offer:51offer-nguserinfo-api
  name: 51offer Ng User Info API
  description: runway用户控制层
  humanURL: https://www.51offer.com/
  baseURL: https://m.51offer.com
  tags:
  - ngUserInfo
  properties:
  - type: OpenAPI
    url: openapi/51offer-nguserinfo-api-openapi.yml
  - type: Swagger
    url: openapi/_original/51offer-api-docs-resource-listing.json
  - type: APIReference
    url: https://www.51offer.com/api-docs
  - type: ErrorCatalog
    url: errors/51offer-problem-types.yml
  - type: DataModel
    url: data-model/51offer-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/51offer-horizon-site-overlay.yaml
- type: DomainSecurity
  url: security/51offer-domain-security.yml
- type: Authentication
  url: authentication/51offer-authentication.yml
- type: Website
  url: https://www.51offer.com/
- type: About
  url: https://www.51offer.com/aboutus/
- type: SignUp
  url: https://account.51offer.com/register.html
- type: Login
  url: https://account.51offer.com/login.html
- type: Support
  url: https://account.51offer.com/user/feedback.html
- type: TermsOfService
  url: https://www.51offer.com/aboutus/contract.html
- type: PrivacyPolicy
  url: https://www.51offer.com/aboutus/protection.html
- type: Blog
  url: https://51offer.github.io/
- type: GitHubOrganization
  url: https://github.com/51offer
- type: Partners
  url: https://www.51offer.com/aboutus/cooperation.html
- type: Packages
  url: packages/51offer-packages.yml
- type: Conventions
  url: conventions/51offer-conventions.yml
- type: Conformance
  url: conformance/51offer-conformance.yml
- type: Lifecycle
  url: lifecycle/51offer-lifecycle.yml
- type: Plans
  url: plans/51offer-plans-pricing.yml
- type: RateLimits
  url: rate-limits/51offer-rate-limits.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/51offer-llms.txt
- type: X-MCPServerCandidate
  url: mcp/51offer-mcp.yml
x-enrichment:
  date: '2026-09-05'
  status: enriched
  artifacts_added: 46
  pass: local-v3

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curl "https://apis.io/api/v1/providers/51offer/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/51offer/evidence"

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