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StoreFrontSignal

x402 Paid API / Endpoint Implementation

x402 Paid API / Endpoint Implementation

Starting at$5,000.00Final scope and price are confirmed during your free Project Discovery consultation, before any work begins.

Start With a Free Project Consultation

Before purchasing this service, complete the StorefrontSignal Project Discovery Questionnaire.

We will review what you want to accomplish, discuss it with you during a free consultation, and recommend the appropriate service or custom scope before you pay. We will confirm deliverables, exclusions, customer responsibilities, expected timing, integrations, third-party costs, and price before work begins.

Start Project Discovery

Build paid, machine-accessible API endpoints with proper authentication, enforcement, and verification.

Engineering-led endpoint implementation

This service covers the design and implementation of paid API endpoints intended to be consumed by machines and agents, including how access is authenticated, how payment is enforced, and how the endpoint is verified and monitored.

Who It's For

  • Businesses with data, tooling, or capability worth exposing as a paid API
  • Teams that need payment enforcement built into the access path
  • Operators who need endpoints verified rather than assumed to work

What Is Included

  • Endpoint design and specification
  • Authentication and access-control implementation
  • Payment enforcement on the access path
  • Request handling, error responses, and rate considerations
  • Testing and verification against real request flows
  • Monitoring and logging setup
  • Technical documentation and handoff

What Is Not Included

  • Unlimited endpoints or unbounded API surface
  • Long-term hosting or infrastructure costs
  • Ongoing operation or on-call support after handoff
  • Guaranteed consumption by any agent, crawler, or third party

Customer Responsibilities

Access to the systems and data being exposed, decisions on access rules and pricing, and availability for verification.

How Final Pricing Is Determined

The figure above is a starting point, not a quote. Final scope and price are confirmed during your free Project Discovery consultation, before any work begins, and depend on technical factors including:

  • Number and complexity of integrations
  • Infrastructure and hosting requirements
  • Authentication and access-control requirements
  • API design, endpoints, and data handling
  • Agent behavior, permissions, and approval boundaries
  • Payment architecture and settlement requirements
  • Monitoring, logging, and alerting needs
  • Deployment environment and release process
  • Ongoing support and maintenance expectations

Third-Party Costs

Hosting, domains, API usage, software subscriptions, infrastructure, wallet funding, and other third-party provider charges remain the customer's responsibility and are separate from this engagement unless explicitly included in writing.

What We Do Not Promise

  • No guarantee of revenue, traffic, adoption, or marketplace acceptance
  • No guarantee that any third party, agent, or crawler will pay for access
  • No guarantee of specific technical compatibility until scope is confirmed
  • No legal, tax, accounting, security, or financial advice

What Happens Next

Complete the Project Discovery questionnaire, then schedule your free consultation. We will confirm deliverables, exclusions, responsibilities, timing, and price before work begins. After we agree on scope, you receive a Shopify invoice and pay securely through Shopify.

Start Project Discovery

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