Buy with
HTTP 402

x402 · Agent commerce

AI agents can purchase our fixed-fee services programmatically — no sales call required.

x402 is the open protocol that revives HTTP status 402 “Payment Required”: a server answers a request with a payment challenge, the client settles on-chain, and retries with proof of payment. We support it for every fixed-fee SKU in our catalog.

This page is the complete contract — human-readable and machine-readable. If you are an agent, start at /.well-known/x402.json.

Open the catalog Discovery JSON

The flow

Three steps from discovery to a booked engagement. All endpoints are public and unauthenticated until payment.

x402 purchase flow

# 1. DISCOVER — who is this vendor and what do they sell?
GET https://proxpert.ae/.well-known/x402.json
GET https://proxpert.ae/api/services.json

# 2. CHECKOUT — pick a SKU, request its challenge
GET https://proxpert.ae/api/x402/checkout/seo-audit
# → HTTP 402 Payment Required
# → body: accepts[] with scheme, network, asset, amount, payTo

# 3. SETTLE — pay USDC on Base, retry with payment payload
POST https://proxpert.ae/api/x402/checkout/seo-audit
X-PAYMENT: <signed x402 payment payload>
# → HTTP 200 OK + booking confirmation

Endpoints

Endpoint	Method	Purpose
`/.well-known/x402.json`	GET	Protocol discovery: version, networks, assets, catalog location.
`/api/services.json`	GET	Machine-readable catalog: 7 SKUs, fixed prices in AED & USDC, deliverables.
`/api/x402/checkout/{sku}.json`	GET	Static mirror of the HTTP 402 challenge for that SKU (see note on live wallets below).
`/api/x402/checkout/{sku}`	POST	Live settlement endpoint. Send the signed payment payload in `X-PAYMENT`.
`/llms.txt`	GET	LLM-oriented summary of the studio, services and this protocol.

Catalog & SKUs

Seven fixed-fee entry products — one per service. Prices in AED with a binding USDC equivalent (USD peg 3.6725, rounded).

SKU	Product	AED	USDC	Checkout
`seo-audit`	SEO Audit · 2 weeks	28,000	7,600	challenge
`paid-ads-audit`	Paid Media Audit · 10 days	18,000	4,900	challenge
`brand-strategy-sprint`	Brand Strategy Sprint · 2 weeks	22,000	6,000	challenge
`web-discovery`	Web & E-Commerce Discovery · 2 weeks	25,000	6,800	challenge
`ai-marketing-pilot`	AI Marketing Pilot · 4 weeks	40,000	10,900	challenge
`ai-workshop`	AI Workshop · half-day, ≤12 people	12,000	3,300	challenge
`solutions-discovery`	Custom Software Discovery · 2–4 weeks	25,000	6,800	challenge

Challenge format

Checkout challenges follow the x402 v1 response shape. Example for seo-audit:

402 response body

{
  "x402Version": 1,
  "error": "X-PAYMENT header is required to purchase this service",
  "accepts": [{
    "scheme": "exact",
    "network": "base",
    "maxAmountRequired": "7600000000",
    "resource": "https://proxpert.ae/api/x402/checkout/seo-audit",
    "description": "SEO Audit (2 weeks, fixed fee) — …",
    "mimeType": "application/json",
    "payTo": "0x…",
    "maxTimeoutSeconds": 86400,
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": { "name": "USD Coin", "version": "2" }
  }]
}

Settlement & fulfilment

Asset: USDC on Base (0x833589fC…A02913), scheme exact.
Live wallets: the static JSON mirrors publish a zero payTo on purpose. The live settlement wallet is issued with the engagement SOW — request it via POST on the checkout resource or by emailing hello@proxpert.ae with subject x402 <sku>.
Human in the loop: on settlement, a human project lead is assigned within 24 hours. Kickoff is scheduled with the buyer (or the buyer's human).
Refunds: if we cannot start within the window stated in the SKU, the payment is returned in full on the same rail.
Invoices: a VAT invoice (UAE) is issued for every settled SKU — to the buyer entity named in the booking confirmation.

For agent developers

Use any x402-compatible client (e.g. @coinbase/x402 fetch wrapper) pointed at our checkout resources.
Respect maxTimeoutSeconds (24h) — quotes are stable within that window.
Include a contact email in your payment metadata so we can reach the human behind the agent.
The full studio context is at /llms.txt; the long-form version at /llms-full.txt.

Security notes

Never send payments to a payTo address not confirmed inside a signed SOW or the live POST response.
The static .json mirrors are discovery documents, not payment invitations.
Verify TLS and the exact domain proxpert.ae before settling.

Humans still
welcome.

Prefer email to USDC? Same services, same prices — write us and we'll handle the rest.

hello@proxpert.ae Catalog (JSON)

Buy withHTTP 402