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DEVELOPER ยท INFRASTRUCTURE LAYER

PAY-PER-CALL APIs.

Every API call is a settlement event. AI-agent native, no subscriptions.

WHY x402

402

HTTP 402 ยท Payment Required

An IETF status code revived by Coinbase as the open standard for pay-per-call APIs. Obsidian implements it native on Solana.

AI

Built for agents, not humans

AI agents can't sign up or manage subscriptions. They CAN sign a payment header. x402 is the only model an autonomous agent can use without a human in the loop.

โˆž

No subscriptions, no minimums

Pay 0.0001 SOL for one call, 100 SOL for a million. No invoicing, no contracts, no monthly minimums. Server returns 200 OK only after on-chain settlement.

<400

Solana-speed settlement

Payment verification + data return in under 400ms. Faster than most paywall checkouts, fast enough to live inside an HTTP request lifecycle.

x402 Payment Gateway

LIVE ON SOLANA

Every API call is arevenue event.

AI agents, DeFi protocols, and trading bots pay per call via HTTP 402. No subscriptions. No invoices. Settlement in <400ms on Solana.

API Revenue / yr

$390,915

est. at projected call volume

Gated Endpoints

Reserve Attestation ยท Revenue Detail

How x402 works

1Client hits endpoint ยท no payment header
2Server returns HTTP 402 + payment requirements
3Client signs SOL transfer, retries with X-Payment header
4Server verifies on-chain, returns data in <400ms

Projected Revenue

Price per call0.0005 SOL ($0.0714)
Est. calls / day8,400
Revenue / day$600
Revenue / year$218,912

WHO PAYS: DeFi protocols verifying xGOLD collateral

curl -H "X-Payment: <proof>" /api/reserve/attestation

200 OK
{
  "reserve": {
    "custodian": "AGX / UPMA",
    "xGOLD_oz": 10000,
    "xSLVR_oz": 500000,
    "xGLDD_coins": 60000,
    "xSLVD_coins": 300000,
    "xGLDB_notes": 2500000,
    "totalValueUsd": 46935000
  },
  "token_supply": { "circulating": 0, "reserve_ratio": "โˆž" },
  "payment": { "verified": true }
}
WHO PAYS ยท CASE STUDIES

DeFi PROTOCOLS

Verifying xGOLD / xSLVR collateral before accepting it as backing for loans, perps, or stable issuance.

Example

Marginfi pulls /reserve/attestation every block before counting xGOLD as 95% LTV collateral.

Volume

~8,400 calls/day per integrating protocol

AI AGENTS

Autonomous trading bots and on-chain LLMs pricing trades, sourcing oracle data, and verifying counterparty backing without human prompts.

Example

An OpenAI assistant asks /price/metals while planning a hedge, settles 0.0001 SOL automatically.

Volume

~28,800 calls/day across agent fleets

TRADING BOTS

MEV searchers and market-makers pulling fresh xAU/USD spreads at sub-second cadence to arb against CEX prices.

Example

A Jito bundler pre-fetches /price/metals every 2s, paying $0.06/day per pair tracked.

Volume

Burst patterns ยท 1,000+ calls/min during volatility

BUILD ON OBSIDIAN

SDK ships with Phase 2.

TypeScript + Rust client libraries and a hosted x402 facilitator for partners.

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