x402 payments

developerreadiness check

Pay-per-request over HTTP 402: flow, live Bankr services on Base, and the Meridian Robinhood Chain lane.

What x402 is

x402 is pay-per-request over HTTP: a paid endpoint answers 402 Payment Required with machine-readable payment requirements; the client pays (USDC or USDG, depending on the lane) and retries with a payment proof. No accounts, no API keys, no credentials — which is exactly the property HISS needs, because HISS never accepts credentials.

The two payment lanes

HISS tracks the payment chain separately from the vault chain. Vault deposits and contracts live on Robinhood Chain regardless of how a service call is paid.

x402 payment lane endpoints
Method	Path	Mode	Description
POST	Bankr x402 Cloud (lane)	live	Production paid-service rail, settles on Base (USDC) where configured. Hosts the 11 live HISS services for the Bankrbot autonomy path and the original CoilOps tools.
POST	Meridian x402 (lane)	configurable	Meridian documents x402 facilitator support for Robinhood Chain with USDG. HISS uses it as the Robinhood Chain lane for vault services when configured and verified.
POST	Self-hosted (lane)	disabled	A research candidate only. Not deployed, not claimed.

The flow

402 challenge → pay → retry

# 1. Call a paid service without payment — you get the challenge:
curl -s -i https://x402.bankr.bot/0x403bad53f39a74154a1c9a86852e443738328761/compile-coil-for-robinhood \
  -H "content-type: application/json" -d '{"coil": { … }}'
# HTTP/2 402  ← paymentRequirements in the body

# 2. Pay with an x402-capable client (x402-fetch, Bankr, or any agent wallet)
#    and retry with the X-PAYMENT header the client produces.

Service directory

The live per-service directory — provider, payment chain, price, and settlement asset — is served by the API rather than duplicated here:

curl

curl -s https://www.hiss.finance/api/x402/providers

Current services include the five Bankrbot autonomy-path services (compile, validate, prompt, simulate, audit — $0.50–$1.00), the original CoilOps services, and the eight vault services (validate fuses, rebalance policy, simulation, receipts, audits, risk score, due-diligence pack, comparison — $0.25–$2.00).