Silverpop Engage is the email marketing, marketing automation and transactional messaging API now sold as Acoustic Campaign, and one of the longest-lived commercial marketing APIs still in production. The operation names an integrator calls today — AddRecipient, ScheduleMailing, RawRecipientDataExport — are the original Silverpop names, unchanged through acquisition by IBM in 2014 (as Watson Campaign Automation) and the carve-out to Acoustic in 2019; silverpop.com now 301s to acoustic.com and the developer portal lives at developer.goacoustic.com. Two surfaces sit behind one per-tenant host: a single-endpoint XML API at /XMLAPI carrying roughly sixty operations across contact databases, contact lists, relational tables, scoring models, templates and mailings, dynamic content and reporting, and a narrower JSON REST API at /rest with eleven resources including gdpr_jobs. Authentication is OAuth 2.0 with the refresh_token grant only and no scope model; the binding runtime limit is a cap of ten concurrent requests per organization rather than a request rate.
Silverpop publishes 6 APIs on the APIs.io network, including Authentication API, Campaigns API, Contacts API, and 3 more. Tagged areas include Email Marketing, Marketing Automation, Campaign Management, Digital Marketing, and Transactional Email.
The Silverpop catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
Silverpop’s developer surface includes authentication, documentation, API reference, getting-started guide, pricing, engineering blog, support, and 27 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Telecommunications 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.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
name: Silverpop
description: 'Silverpop Engage is the email marketing, marketing automation and transactional messaging API now sold as Acoustic
Campaign, and one of the longest-lived commercial marketing APIs still in production. The operation names an integrator
calls today — AddRecipient, ScheduleMailing, RawRecipientDataExport — are the original Silverpop names, unchanged through
acquisition by IBM in 2014 (as Watson Campaign Automation) and the carve-out to Acoustic in 2019; silverpop.com now 301s
to acoustic.com and the developer portal lives at developer.goacoustic.com. Two surfaces sit behind one per-tenant host:
a single-endpoint XML API at /XMLAPI carrying roughly sixty operations across contact databases, contact lists, relational
tables, scoring models, templates and mailings, dynamic content and reporting, and a narrower JSON REST API at /rest with
eleven resources including gdpr_jobs. Authentication is OAuth 2.0 with the refresh_token grant only and no scope model;
the binding runtime limit is a cap of ten concurrent requests per organization rather than a request rate.'
x-successor:
brand: Acoustic
profile: all/acoustic
note: Silverpop is the legacy brand of the platform Acoustic sells today. This profile covers the Silverpop-branded surface
— the github.com/Silverpop SDK organization and the Engage/Campaign API contract that carries the Silverpop operation
names. The live Acoustic Campaign Swagger 1.1 service descriptions are held once, in the Acoustic profile, and are deliberately
not duplicated here.
accessModel:
pricing: paid
onboarding: sales
trial: false
try_now: false
public: true
label: Public docs, sales-gated onboarding
confidence: high
source:
- https://www.acoustic.com/pricing
- https://developer.goacoustic.com/acoustic-campaign/reference/api-developers-guide-and-legal-information
generated: '2026-08-13'
method: searched
note: Corrects a 2026-07-22 derivation that read "freemium / self-serve" off a scaffolded plans file. The provider publishes
three packages (Professional, Premium, Ultimate), no prices, no free tier and no self-serve signup — every tier's call
to action is "Get a demo" — and the API developer's guide states that use of the XML API is "strictly prohibited unless
you have a valid, unexpired Agreement in place." Documentation is fully public and requires no login.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/silverpop.png
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/apis.yml
created: '2026-05-02'
modified: '2026-08-13'
specificationVersion: '0.23'
tags:
- Email Marketing
- Marketing Automation
- Campaign Management
- Digital Marketing
- Transactional Email
- SMS
- Customer Data
- Contact Management
- Mobile Push
- Marketing Analytics
apis:
- aid: silverpop:silverpop-authentication-api
name: Silverpop Authentication API
description: OAuth 2.0 token management
humanURL: https://developer.goacoustic.com/acoustic-campaign/reference/overview
baseURL: https://api-campaign-us-1.goacoustic.com
tags:
- Authentication
properties:
- type: OpenAPI
url: openapi/silverpop-authentication-api-openapi.yml
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: NodeJSSDK
url: https://github.com/Silverpop/node-engage
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: SpectralRules
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/rules/silverpop-rules.yml
- aid: silverpop:silverpop-campaigns-api
name: Silverpop Campaigns API
description: Email campaign management
humanURL: https://developer.goacoustic.com/acoustic-campaign/reference/overview
baseURL: https://api-campaign-us-1.goacoustic.com
tags:
- Campaigns
properties:
- type: OpenAPI
url: openapi/silverpop-campaigns-api-openapi.yml
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: NodeJSSDK
url: https://github.com/Silverpop/node-engage
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: SpectralRules
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/rules/silverpop-rules.yml
- aid: silverpop:silverpop-contacts-api
name: Silverpop Contacts API
description: Contact (recipient) list management
humanURL: https://developer.goacoustic.com/acoustic-campaign/reference/overview
baseURL: https://api-campaign-us-1.goacoustic.com
tags:
- Contacts
properties:
- type: OpenAPI
url: openapi/silverpop-contacts-api-openapi.yml
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: NodeJSSDK
url: https://github.com/Silverpop/node-engage
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: SpectralRules
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/rules/silverpop-rules.yml
- aid: silverpop:silverpop-programs-api
name: Silverpop Programs API
description: Marketing automation program management
humanURL: https://developer.goacoustic.com/acoustic-campaign/reference/overview
baseURL: https://api-campaign-us-1.goacoustic.com
tags:
- Programs
properties:
- type: OpenAPI
url: openapi/silverpop-programs-api-openapi.yml
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: NodeJSSDK
url: https://github.com/Silverpop/node-engage
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: SpectralRules
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/rules/silverpop-rules.yml
- aid: silverpop:silverpop-reports-api
name: Silverpop Reports API
description: Campaign reporting and analytics
humanURL: https://developer.goacoustic.com/acoustic-campaign/reference/overview
baseURL: https://api-campaign-us-1.goacoustic.com
tags:
- Reports
properties:
- type: OpenAPI
url: openapi/silverpop-reports-api-openapi.yml
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: NodeJSSDK
url: https://github.com/Silverpop/node-engage
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: SpectralRules
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/rules/silverpop-rules.yml
- aid: silverpop:silverpop-transactional-api
name: Silverpop Transactional API
description: Transactional email and SMS messaging
humanURL: https://developer.goacoustic.com/acoustic-campaign/reference/overview
baseURL: https://api-campaign-us-1.goacoustic.com
tags:
- Transactional
properties:
- type: OpenAPI
url: openapi/silverpop-transactional-api-openapi.yml
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: NodeJSSDK
url: https://github.com/Silverpop/node-engage
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: SpectralRules
url: https://raw.githubusercontent.com/api-evangelist/silverpop/refs/heads/main/rules/silverpop-rules.yml
common:
- type: AgenticAccess
url: agentic-access/silverpop-agentic-access.yml
- type: DomainSecurity
url: security/silverpop-domain-security.yml
- type: Authentication
url: authentication/silverpop-authentication.yml
- type: LinkedIn
url: https://www.linkedin.com/company/silverpop-systems-inc
- type: GitHubOrganization
url: https://github.com/Silverpop
- type: DeveloperPortal
url: https://developer.goacoustic.com
- type: Documentation
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: Authentication
url: https://developer.goacoustic.com/acoustic-campaign/docs/authentication
- type: APIReference
url: https://developer.goacoustic.com/acoustic-campaign/reference/overview
- type: GettingStarted
url: https://developer.goacoustic.com/acoustic-campaign/reference/getting-started-with-oauth
- type: Postman
url: https://documenter.getpostman.com/view/1643559/2sBXqQEHNz
- type: StatusPage
url: https://status.goacoustic.com
- type: Pricing
url: https://www.acoustic.com/pricing
- type: Blog
url: https://www.acoustic.com/resources/blog
- type: Support
url: https://help.goacoustic.com
- type: SignUp
url: https://www.acoustic.com/demo
- type: Login
url: https://login.goacoustic.com
- type: TermsOfService
url: https://www.acoustic.com/terms-conditions
- type: PrivacyPolicy
url: https://www.acoustic.com/privacy-notice
- type: Packages
url: packages/silverpop-packages.yml
- type: SDKs
url: packages/silverpop-packages.yml
- type: WellKnown
url: well-known/silverpop-well-known.yml
- type: APICatalog
url: well-known/silverpop-api-catalog.json
- type: MCPServer
url: mcp/silverpop-mcp.yml
- type: LLMsTxt
url: llms/silverpop-llms.txt
- type: Conformance
url: conformance/silverpop-conformance.yml
- type: Compliance
url: conformance/silverpop-conformance.yml
- type: ErrorCatalog
url: errors/silverpop-problem-types.yml
- type: Lifecycle
url: lifecycle/silverpop-lifecycle.yml
- type: Deprecation
url: lifecycle/silverpop-lifecycle.yml
- type: Conventions
url: conventions/silverpop-conventions.yml
- type: Plans
url: plans/silverpop-plans-pricing.yml
- type: RateLimits
url: rate-limits/silverpop-rate-limits.yml
- type: FinOps
url: finops/silverpop-finops.yml
maintainers:
- FN: API Evangelist
url: https://apievangelist.com
email: info@apievangelist.com
x-enrichment:
date: '2026-08-13'
status: enriched
artifacts_added: 9
pass: local-v1
note: 'Contract discovery ran to the end of STEP 0b and the honest answer is that this provider publishes no OpenAPI. developer.goacoustic.com
is a ReadMe SuperHub whose catch-all answers HTTP 200 with the same 740,863-byte HTML shell for /openapi.json, /swagger.json,
/api-docs, /redoc and every /.well-known/* path — the classic soft-200. Its server-rendered state does list four uploaded
API definitions (events-2, events-5, events-6, events-7.json) but exposes no public download route, and api.readme.com/v2
401s without a key. Exactly one real document is served from a well-known path: an RFC 9727 api-catalog (application/linkset+json)
with six anchors, saved verbatim. The only machine-readable service description that exists is Swagger 1.1, served live
off the API host itself at /restdoc/<resource> — verified 200 at api-campaign-us-1.goacoustic.com/restdoc/messages. Those
Swagger documents were harvested into the sibling Acoustic profile on the same day and are NOT duplicated here.
Two corrections were more valuable than the additions. The plans and rate-limits files were 2026-05-04 bulk-sweep scaffolds
asserting a free tier with a monthly request quota and a full X-RateLimit-* header set; the provider publishes none of
that. Real pricing is three unpriced sales-gated packages, and the real limit is a concurrency cap of 10 in-flight requests
per organization with no rate-limit headers anywhere on the API. The accessModel block, which had been derived from that
scaffold as "freemium / self-serve", was corrected to paid / sales.
Package currency is the sharpest signal in this profile: the first-party Node client on npm (watson-campaign-automation-api,
named for the IBM era) last shipped 0.1.9 on 2019-11-19, the Java client was never published to Maven Central at all,
and only the mobile SDK still moves — AcousticMobilePush 3.10.6 on CocoaPods, 2026-02-17.
Not written, deliberately: no a2a/ (the agent-card 200s are the SPA shell), no changelog/ (the docs project has its changelog
module disabled), no scopes/ (the OAuth model has none — a refresh token inherits the bound user''s full permissions),
no skills/ and no overlays/ (the six files in openapi/ are pipeline scaffolds, not provider-published, and their operationIds
are invented — grounding skills in them would teach an agent to call paths like /rest/mailings that the live Swagger shows
as /rest/messages).'
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