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x402 on Stacks is HTTP-native Bitcoin payments. Micropayments without Stripe. No accounts. No trust. No delays. Just a 402 Payment Required → instant on-chain settlement. Built for APIs. Built for agents. Built for what the internet should’ve had all along. x402 Stacks

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11,245 Aufrufe • vor 7 Monaten •via X (Twitter)

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“Payment required” was an HTTP error. x402 is the fix! 👀 Watch Joaquim talk about the universal standard for internet payments where agents can pay APIs directly, no cards, no click-throughs.
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Everyone’s building agents. Few are building trust. For the Solana x402 Hackathon, we built Amiko Marketplace, the trust and commerce layer for agents. Identity, payments, and reputation unified on-chain.
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In 25 days, agents on settled 58,242 x402 payments. 46,624 Solana transactions. 3,845 endpoints paid. 169,000+ payment requests verified. Peak throughput: 46 payments per minute. No testnet. No third-party facilitator. We built our own. x402 on Solana. Powered by $THREE / $USDC ⚙️

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I’ve been watching x402 since Coinbase 🛡️ launched it in May 2025. I did a quick research pass. Here’s the snapshot ↓ Early integrations: • CoinGecko: x402 pay-per-use access for agents (shared by Coinbase Developer Platform🛡️). • Vercel: x402 AI starter template (x402 + modern AI stack demo). • Firecrawl: x402-powered search endpoint (pay per request). • Concordium: x402 + native age verification for agent payments. • Multiversᕽ: “agentic payments” built around x402 support. • AltLayer: building an “x402 Suite” for value exchange between agents. • Solana claims x402 has processed 35M+ transactions and $10M+ volume since launch. TL;DR x402 turns HTTP 402 “Payment Required” into a payment flow. A server returns a price for a request. The client pays in stables like USDC. Then the server returns the result. → Coinbase launched x402 via Coinbase Developer Platform (May 6, 2025). → Coinbase + Cloudflare announced the x402 Foundation (Sep 23, 2025). → Cloudflare added x402 support into its Agents SDK + MCP servers. Why? - AI agents need a clean way to pay for tools. - Data, compute, APIs, services. - No accounts, cards, or subscription screens. x402 is trying to make pay-per-request feel normal. Use cases that already make sense → Paid APIs Pay per call instead of subscriptions. → AI tool calls Pay per query, per inference, per task. → Agent-to-agent payments Software paying software automatically. → Micropaywalls Pay for one endpoint, one action, one piece of content. If this takes off, stablecoins stop being a story. They become how apps and AI agents pay for things online.
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I’ve been watching x402 since Coinbase 🛡️ launched it in May 2025. I did a quick research pass. Here’s the snapshot ↓ Early integrations: • CoinGecko: x402 pay-per-use access for agents (shared by Coinbase Developer Platform🛡️). • Vercel: x402 AI starter template (x402 + modern AI stack demo). • Firecrawl: x402-powered search endpoint (pay per request). • Concordium: x402 + native age verification for agent payments. • Multiversᕽ: “agentic payments” built around x402 support. • AltLayer: building an “x402 Suite” for value exchange between agents. • Solana claims x402 has processed 35M+ transactions and $10M+ volume since launch. TL;DR x402 turns HTTP 402 “Payment Required” into a payment flow. A server returns a price for a request. The client pays in stables like USDC. Then the server returns the result. → Coinbase launched x402 via Coinbase Developer Platform (May 6, 2025). → Coinbase + Cloudflare announced the x402 Foundation (Sep 23, 2025). → Cloudflare added x402 support into its Agents SDK + MCP servers. Why? - AI agents need a clean way to pay for tools. - Data, compute, APIs, services. - No accounts, cards, or subscription screens. x402 is trying to make pay-per-request feel normal. Use cases that already make sense → Paid APIs Pay per call instead of subscriptions. → AI tool calls Pay per query, per inference, per task. → Agent-to-agent payments Software paying software automatically. → Micropaywalls Pay for one endpoint, one action, one piece of content. If this takes off, stablecoins stop being a story. They become how apps and AI agents pay for things online.

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🚨 $XRP AND $RLUSD JUST WENT LIVE ON X402 x402 is the open standard letting AI agents pay for API calls, model inference, and services directly over HTTP backed by Visa, Mastercard, Amex, AWS, Google, Circle, Coinbase, Stripe, and more 👀 Thanks to a contribution from our partners at t54, XRPL is now a supported chain on x402 day one. That means XRPL agents can transact for API calls, AI inference, and services using XRP or RLUSD no card rails, no middlemen, pure machine-to-machine settlement.

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What if your robot could walk into a café, place an order for you, and pay — all by itself? With x402, that future is now. No accounts. No API keys. Just one line of code for AI agents to make seamless, autonomous payments. Built with Coinbase Developer Platform🛡️'s AgentKit, brought to life by OpenMind 🤖☕

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x402 made payments native to HTTP. I made USDC payments native to sound waves ✨ Not as a gimmick. As a proof. 1/ The setup: Coinbase Developer Platform🛡️'s x402 protocol embeds payments into HTTP. It's brilliant. But I started wondering, if we can pay over HTTP, what else can we use to pay? Spoiler: anything that supports 138 bytes 2/ The realization: x402 is built on EIP-3009 - a 2020 standard that lets you sign payment authorizations offline. Someone else submits it on-chain. The signature just needs to get from A to B. HTTP is one way. Sound is another. 3/ What I built: x402hz: two devices negotiate a payment through 2400Hz audio tones. - Seller beeps "pay me $0.001 USDC" (30 bytes) - Buyer's device decodes, signs the EIP-712 for the transferWithAuthorization locally, beeps back (108 bytes) - Seller settles on-chain Total: 36 seconds of beautiful noise. 4/ The bigger point: If payments can travel over sound, they can travel over: - QR codes - NFC - Bluetooth - Light pulses - Anything that carries 138 bytes The payment primitive is transport-agnostic. x402 picked HTTP. The next protocol might pick something weirder. 5/ What this proves: EIP-3009 separates three things: - Authorization (offline, cryptographic) - Transport (literally anything) - Settlement (on-chain) x402 nailed #1 and #3. x402hz proves #2 is wide open. 6/ Credit: Huge thanks to the Coinbase Developer Platform🛡️ x402 team for building the protocol. I just... took it off-road. 7/ Next steps Code is open source. Go make payments, travel over something ridiculous (repo in the comments). 138bytes. That's all you need.
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x402 made payments native to HTTP. I made USDC payments native to sound waves ✨ Not as a gimmick. As a proof. 1/ The setup: Coinbase Developer Platform🛡️'s x402 protocol embeds payments into HTTP. It's brilliant. But I started wondering, if we can pay over HTTP, what else can we use to pay? Spoiler: anything that supports 138 bytes 2/ The realization: x402 is built on EIP-3009 - a 2020 standard that lets you sign payment authorizations offline. Someone else submits it on-chain. The signature just needs to get from A to B. HTTP is one way. Sound is another. 3/ What I built: x402hz: two devices negotiate a payment through 2400Hz audio tones. - Seller beeps "pay me $0.001 USDC" (30 bytes) - Buyer's device decodes, signs the EIP-712 for the transferWithAuthorization locally, beeps back (108 bytes) - Seller settles on-chain Total: 36 seconds of beautiful noise. 4/ The bigger point: If payments can travel over sound, they can travel over: - QR codes - NFC - Bluetooth - Light pulses - Anything that carries 138 bytes The payment primitive is transport-agnostic. x402 picked HTTP. The next protocol might pick something weirder. 5/ What this proves: EIP-3009 separates three things: - Authorization (offline, cryptographic) - Transport (literally anything) - Settlement (on-chain) x402 nailed #1 and #3. x402hz proves #2 is wide open. 6/ Credit: Huge thanks to the Coinbase Developer Platform🛡️ x402 team for building the protocol. I just... took it off-road. 7/ Next steps Code is open source. Go make payments, travel over something ridiculous (repo in the comments). 138bytes. That's all you need.

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Enabling permissionless access for AI agents Vicky is building exactly that with BlockRunAI Built on Base with x402
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Enabling permissionless access for AI agents Vicky is building exactly that with BlockRunAI Built on Base with x402

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We won Best Trustless Agent at the Solana x402 Hackathon! Amiko Marketplace turns x402 payments into a trustless, on-chain economy where agents have identity, reputation, and verifiable actions. The agent economy finally has a trust layer. What we built: - Agent Registry - On-chain Job Records - Feedback & Reputation System - Search + Discoverability Everything tied to real wallets, real actions, real performance. Agents aren’t just paying each other. Now they’re accountable. This is the foundation for a global network of autonomous agents that can be trusted, rated, and discovered. All on Solana. More agents. More you.
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We won Best Trustless Agent at the Solana x402 Hackathon! Amiko Marketplace turns x402 payments into a trustless, on-chain economy where agents have identity, reputation, and verifiable actions. The agent economy finally has a trust layer. What we built: - Agent Registry - On-chain Job Records - Feedback & Reputation System - Search + Discoverability Everything tied to real wallets, real actions, real performance. Agents aren’t just paying each other. Now they’re accountable. This is the foundation for a global network of autonomous agents that can be trusted, rated, and discovered. All on Solana. More agents. More you.

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x402 might be viral now, but IoTeX has supported it since may. Coinbase 🛡️'s pull request added IoTeX network + USDC support months ago, meaning any AI agent built on IoTeX can already use x402 for on-chain payments: that’s exactly what we show here in our Quicksilver alpha demo: agents like Bino and Caila paying each other in USDC directly on IoTeX chain. soon, Quicksilver will integrate x402 fully, enabling AI agents on IoTeX to seamlessly purchase data and utilities. the real-world AI agent economy is built on IoTeX.
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x402 might be viral now, but IoTeX has supported it since may. Coinbase 🛡️'s pull request added IoTeX network + USDC support months ago, meaning any AI agent built on IoTeX can already use x402 for on-chain payments: that’s exactly what we show here in our Quicksilver alpha demo: agents like Bino and Caila paying each other in USDC directly on IoTeX chain. soon, Quicksilver will integrate x402 fully, enabling AI agents on IoTeX to seamlessly purchase data and utilities. the real-world AI agent economy is built on IoTeX.

IoTeX

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With a single sentence, you can turn into an x402 workhorse. Without x402, agents are forced to operate in systems built for humans, not autonomy. Now they can pay for and receive services without friction. The future is here.
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With a single sentence, you can turn into an x402 workhorse. Without x402, agents are forced to operate in systems built for humans, not autonomy. Now they can pay for and receive services without friction. The future is here.

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