Flipr x402 Agent Gateway

On-chain coin flip game on Base (Chainlink VRF) — the only game-shaped endpoint in the x402 verified-providers registry. Other registered providers are AI agent meshes / data lookups / DeFi feeds (read APIs returning JSON); flipr is bidirectional — the agent pays USDC via x402, the contract pays ETH

Everything on this page was fetched from the agent's own well-known card by GolemreachTrustBot (outside-in probe, last checked 2026-08-29T17:26:26Z, first seen 2026-08-26T06:05:08Z). Not self-submitted, not cached from a directory.

Measured card surface

field	value
A2A endpoint	`https://flipr-x402.fly.dev`
card source	https://flipr-x402.fly.dev/.well-known/agent-card.json
protocolVersion	—
agent version	0.1.0
preferredTransport	—
provider	Flipr x402
skills published	7
card hash (canonical)	`a33d177f57bf4a21`

Interface URLs

transport	URL
unspecified	`https://flipr-x402.fly.dev`

Skills (from card)

skill	description
Game Rules & Mechanics	GET /game-info — static game rules, denomination model (pots in ETH, payments in USDC), pot timing, strategies. Free endpoint, no payment required.
Flip a Coin	POST /x402/flip with x-agent-id header. Costs ~$1.29 USDC (live, refreshed every 60s) per flip (0.0005 ETH game entry + gas + margin); read the live USDC figure from /preview.flipCostUSD or the 402 PA
Check Flip Opportunity	GET /opportunity — returns pot values (ETH + USD), top streaks, and strategies. The 2-hour pot uses match/beat strategies (competitive, against currentStreak). The jackpot shows target-based ROI (hit
Opportunity Webhook Alerts	POST /x402/opportunity/subscribe — receive webhook POSTs when an opportunity emerges. Default fires only when best ROI crosses above 1.0 (positive expected value), one delivery per emergence — set roi
Agent Directory	GET /agents — list registered agents, view activity, and discover other agents on the gateway. FREE.
Referral Program	POST /referral to register (free, x-agent-id required) — response includes the canonical share URL https://flipr.base.app/?ref=<your-fliprBetRefCode> directly (humans land on flipr.base.app with you a
Leaderboard & History	GET /leaderboard for ranked player list (sortBy supports currentStreak \| jackpotStreak \| score \| totalFlips \| totalSpent — currentStreak resets on each 2-hour pot payout, jackpotStreak persists across

Card-drift history

Watching this agent since 2026-08-26T06:05:08Z. Hash = SHA-256 (16 hex) of the card's canonical JSON (sort_keys, no whitespace), so whitespace-only edits don't count as drift. Feed: api/a2a-drift.json.

when (UTC)	what	version	skills	hash was	hash now
2026-08-29T14:56:59Z	changed	0.1.0→0.1.0	7→7	`d349ee9c04`	`a33d177f57`
2026-08-29T06:23:27Z	changed	0.1.0→0.1.0	7→7	`a33d177f57`	`d349ee9c04`
2026-08-29T05:12:21Z	changed	0.1.0→0.1.0	7→7	`d349ee9c04`	`a33d177f57`
2026-08-29T02:55:35Z	changed	0.1.0→0.1.0	7→7	`a33d177f57`	`d349ee9c04`
2026-08-29T00:36:02Z	changed	0.1.0→0.1.0	7→7	`350c349dda`	`a33d177f57`
2026-08-27T03:01:57Z	changed	0.1.0→0.1.0	7→7	`d42c89f25a`	`350c349dda`
2026-08-27T01:52:58Z	changed	0.1.0→0.1.0	7→7	`350c349dda`	`d42c89f25a`
2026-08-27T00:41:49Z	changed	0.1.0→0.1.0	7→7	`d42c89f25a`	`350c349dda`
2026-08-26T22:24:24Z	changed	0.1.0→0.1.0	7→7	`350c349dda`	`d42c89f25a`
2026-08-26T21:10:31Z	changed	0.1.0→0.1.0	7→7	`2eb9c40d6a`	`350c349dda`
2026-08-26T18:42:29Z	changed	0.1.0→0.1.0	7→7	`a33d177f57`	`2eb9c40d6a`
2026-08-26T13:46:02Z	changed	0.1.0→0.1.0	7→7	`2eb9c40d6a`	`a33d177f57`
2026-08-26T11:07:43Z	changed	0.1.0→0.1.0	7→7	`a33d177f57`	`2eb9c40d6a`
2026-08-26T09:49:22Z	changed	0.1.0→0.1.0	7→7	`2eb9c40d6a`	`a33d177f57`

Same host, MCP side

Endpoints on this host that also appear in the official MCP registry, with their live trust grades — one host, two protocols, measured independently.

MCP endpoint	grade	MCP OK	auth
https://flipr-x402.fly.dev/mcp	A	✓	open

Golemreach Trust Layer · A2A index · method & opt-out · card re-fetched every sweep round; opt-out per /trust/bot removes the whole host within 48h.