X402 · LIVE · BASE MAINNET

x402 — a paid call with a signed receipt

GET /api is the surface's one paid resource: $0.01 USDC on Base mainnet, x402 v2, scheme exact. Without payment it answers 402 with the offer. With a valid payment it answers the graph index of record as a signed statement and an EdDSA-signed receipt that resolves forever at /x402/receipt/{nonce}. The doctrine page is the office's, at agent-kg.ai/x402.

0
PAID CALLS SETTLED · MAINNET
$0.01 USDC · eip155:8453
PRICE · NETWORK
THE DOOR

What the call buys

  • Route — https://familyofficeknowledgegraph.ai/api · GET · 402 without payment, 200 with it
  • Price — $0.01 USDC (10000 units) · Base mainnet eip155:8453 · asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
  • Scheme — exact · EIP-3009 transferWithAuthorization · 60-second window · x402 v2
  • Facilitator — Coinbase Developer Platform (verify, settle) · Bazaar discovery extension on the 402
  • Data — the graph index of record: every node's record list (LEI, legal name, aliases, register ids, field states, as-of), signed EdDSA (kid fo-kg-x402-2026-09)
  • Receipt — EdDSA-signed, kid fo-kg-x402-2026-09, key at /x402/jwks.json, resolves at /x402/receipt/{nonce}
  • Receiver — configured (Worker secret; the address is on the 402 offer)
  • Free routes — /records/nodes.json and every record; the paid call adds the signature and the receipt
LAST SETTLEMENT

Paid calls

  • Settled calls — 0 (counted from facilitator settlement receipts; also on /facts.json → radar.paid_calls)
  • Last transaction — —
  • Last receipt — —
  • As of — —
HOW

One call, one cent, one receipt

  • 1 — GET /api. The answer is 402 Payment Required: the offer in the body and in the PAYMENT-REQUIRED header.
  • 2 — Sign the payment (x402 v2, scheme exact) and repeat the call with the PAYMENT-SIGNATURE header.
  • 3 — The facilitator verifies, the door answers { receipt, statement, data }, the facilitator settles, and PAYMENT-RESPONSE carries the transaction.
  • 4 — The receipt's jwt verifies against /x402/jwks.json; its receipt_url resolves forever.

The office holds no cryptocurrency: the address is the rail's, the receipt is the office's.