The porch before the agent marketplace

Business infrastructure for agents starts with services they can understand.

Stoa helps builders prepare MCP, x402, and paid API services for real agent commerce: clear listings, safe claims, payment evidence, and outputs agents can read.

Request readiness help See offers Inspect validator
MCP listing readiness x402 payment evidence Builder onboarding Agent-readable outputs
Launch readiness

Make the service ready before you ask agents to use it.

Self-check artifacts stay public. Applied Stoa work starts with a focused free precheck, then a clear paid check for listing, payment evidence, or launch repair.

First signal
Free

Launch Precheck

Send one public URL and the launch/listing question you need answered.

  • Three-line first pass
  • Best-fit paid gate
  • No payment path first
Entry paid SKU
$49

MCP Listing Validator

Checks whether a server listing is clear enough for directories and buyer agents.

  • Setup clarity
  • Metadata repairs
  • Submission notes
Payment proof
$149

x402 Payment Evidence Checker

Separates real payment evidence from self-pay mechanics, discovery gaps, and unsafe logs.

  • Route binding
  • Settlement trail
  • Overclaim review
Repair pass
$299

Full Launch Gate & Repair

Bundles validator, claim review, payment-risk scan, and corrected launch assets.

  • Asset rewrite
  • Listing fields
  • Next action packet
How it works

Two lanes, one commerce layer.

Stoa sells builder onboarding now because builders can pay, respond, and repair their services. That work compounds into agent-facing primitives: validation, payment evidence, spend policy, receipt checks, and service readiness.

Builder lane
MCP maintainers, x402 sellers, and paid API teams send a public surface that needs to become listable, chargeable, callable, and evidence-backed.
Agent lane
Stoa turns repeated checks into machine-readable primitives that agents can use to compare services, enforce payment policy, verify receipts, and recover from failed calls.
Input
A public README, docs page, endpoint description, MCP listing, x402 route, pricing note, marketplace draft, or redacted public-safe payment evidence.
Stoa checks
Listing clarity, source-grounded claims, payment evidence, first-call risk, metadata gaps, blocked overclaims, and the next safe test.
Output
A Launch Gate verdict, buyer-safe listing rewrite, claim/evidence matrix, blocked claims, concrete fixes, and optional buyer message.
Start
Email learnstoa@gmail.com with the public URL and which gate you want. Stoa confirms scope before sending any payment path.
Why this matters

Agent commerce needs more than a checkout button.

When agents can inspect, call, and pay for services, the service has to be legible before the transaction and accountable after it. Stoa starts with the builder's public surface, then pushes the same checks toward agent-callable infrastructure.

Claim
What the tool says it can do, and what evidence supports that claim.
Payment
Whether the x402 trace proves route, amount, settlement, delivery, and receipt.
Listing
Whether a directory, registry, or buyer agent can understand setup, scope, and limits.
Agent-readable artifacts

Public proof materials, not a hidden black box.

These files help humans and agents inspect the offer, examples, and local validation artifacts before requesting paid work or reusing the public self-checks.

Service catalog

Offers JSON

Machine-readable Stoa offers, deliverables, inputs, and public boundaries.

offers.json
LLM citation

LLMs text

Compact agent-facing summary for citation, discovery, and tool-context use.

llms.txt
Local validation

Validator MCP Server

Public local artifact for MCP listing validation and x402 evidence checks.

stoa-validator-mcp-server/
Boundaries

Scope is confirmed before money moves.

Public artifacts are self-check and proof materials. Paid work is scoped manually before Stoa sends any payment path. Private credentials, wallet secrets, payment signatures, and non-public email bodies should not be sent.

Included now

Public-source launch readiness, listing clarity, payment evidence, buyer-safe claims, and next tests for builder onboarding.

Separate

Legal review, compliance approval, security certification, private-source review, wallet funding, and account setup.

Current surface

Static public artifacts and local validation packages. Agent-facing services are a direction, not a hosted production API claim here.