Paid Agent APIs

Pay-per-call MCP APIs for AI agents. Every call is settled in USDC via the x402 protocol on Base — no accounts, no API keys, no subscriptions. Payment is the auth: your agent pays per call and gets the result.

Operated by Harrison Truong · Contact: theharrisontruong@gmail.com

Products

Service	What it does	MCP tool	Price	Status
AI Storefront Readiness Grader	Grades any storefront URL A–F across 20 weighted conversion-readiness checks (checkout friction, trust signals, mobile readiness, merchandising completeness) and returns the failing checks	`grade_storefront`	$1.00 / call	✅ LIVE
GEO Audit	Scores any URL's visibility to AI search engines (ChatGPT, Perplexity, Claude, Google AI Overviews) across 20 weighted checks and returns concrete fixes. Free tier: `audit_geo_lite`, rate-limited	`audit_geo`	$1.50 / call	✅ LIVE
A11y Audit	Accessibility lawsuit-risk scan: 20 weighted WCAG checks plus a lawsuit-risk level, framed as risk reduction for US businesses. Automated triage, not a certification	`audit_a11y`	$1.50 / call	Code complete — deploys with the next release
Feed Audit	Product-feed hygiene audit: flags the feed errors that get listings disapproved or suppressed before they cost sales	—	$1.00 / call	Code complete — deploys with the next release

Live endpoints

Service	MCP endpoint	HTTP endpoint
Storefront Grader	`POST https://grader-al6bxcngia-ue.a.run.app/mcp`	`POST https://grader-al6bxcngia-ue.a.run.app/grade`
GEO Audit	`POST https://geo-al6bxcngia-ue.a.run.app/mcp`	`POST https://geo-al6bxcngia-ue.a.run.app/geo` · free: `POST /geo-lite`

Both take { "url": "https://your-site.example" }. Source for every service lives in this repo (grader/, geo/, a11y/).

Add either live service to any MCP client as a remote server:

{
  "mcpServers": {
    "storefront-grader": { "url": "https://grader-al6bxcngia-ue.a.run.app/mcp" },
    "geo-audit": { "url": "https://geo-al6bxcngia-ue.a.run.app/mcp" }
  }
}

For agents: how payment works

Call the tool or endpoint without payment → you get an HTTP 402 with the full payment requirements (amount, network, pay-to address).
Pay in USDC on Base mainnet (eip155:8453) with any x402 client (@x402/fetch, the x402 Python package, CDP or PayAI wrappers) and retry with the payment proof.
The call runs and returns the result. No signup, no key management, no invoice.

Discovery documents (/.well-known/x402):

Both services also declare the Bazaar discovery extension (extensions.bazaar) in their 402 responses, so catalog crawlers can index the paid routes from the 402 alone.

Payment terms: x402 exact scheme · asset USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) · pay to 0xd702C8A8Ee30F6950A2a663010d12FC195D5348e · facilitator PayAI (https://facilitator.payai.network), with Coinbase CDP facilitator support built in.

Listed on

Official MCP Registry — io.github.theharrisontruong-web/storefront-grader · io.github.theharrisontruong-web/geo-audit
Glama (both A-rated) — Storefront Grader · GEO Audit
Smithery — namespace theharrisontruong: storefront-grader · geo-audit
x402scan — Storefront Grader

Registry metadata in this repo

server.json — Official MCP Registry manifest for the Storefront Grader (remote).
server-geo.json — Official MCP Registry manifest for GEO Audit (remote).
server-a11y.json — Official MCP Registry manifest for A11y Audit (publishes on deploy).
glama.json — Glama maintainer claim for this repository.

License

MIT — see LICENSE. The license covers this documentation/metadata repo; the hosted services themselves are pay-per-call as described above.

geo-audit

Documentation