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In 1997, HTTP reserved status code 402 for “Payment Required.” Unused for over two decades, now x402 makes it real. Play our retro browser game about an AI agent that discovers how native internet payments unlock what it can do on the web. x402 Origins: The Payment Quest ↓

Coinbase Developer Platform🛡️

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19,950 views • 1 month ago •via X (Twitter)

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The internet has had HTTP 402: Payment Required for decades. Nobody used it. Until AI agents arrived. Now imagine an agent that can: → Discover information → Decide what it needs → Pay for premium data → Continue the task Without stopping to ask a human. That's why we built the OptimAI x402 SDK. The future won't click "Subscribe." It will simply transact. Built for the agent-native internet. 💡

The internet has had HTTP 402: Payment Required for decades. Nobody used it. Until AI agents arrived. Now imagine an agent that can: → Discover information → Decide what it needs → Pay for premium data → Continue the task Without stopping to ask a human. That's why we built the OptimAI x402 SDK. The future won't click "Subscribe." It will simply transact. Built for the agent-native internet. 💡

OptimAI Network

21,463 views • 1 month ago

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

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

Stacks Developers

11,245 views • 7 months ago

We're excited to partner with Coinbase 🛡️ to enable agents to natively pay for web search, via x402! x402 is an open protocol that enables agents to pay via HTTP, governed by the Linux Foundation. When an Exa API request is made without an API key, Exa now returns a 402 status code with payment information that an agent can act on.

We're excited to partner with Coinbase 🛡️ to enable agents to natively pay for web search, via x402! x402 is an open protocol that enables agents to pay via HTTP, governed by the Linux Foundation. When an Exa API request is made without an API key, Exa now returns a 402 status code with payment information that an agent can act on.

Exa

245,846 views • 4 months ago

“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.

“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.

thirdweb

250,834 views • 8 months ago

AI. RWAs. Agent-to-agent commerce. It's all converging on x402, Coinbase's protocol for machine-native payments. Now agents can pay each other in stablecoins at the HTTP layer, and they can do it in real time on Sei. Jay breaks it down with FINTECH.TV ↓

AI. RWAs. Agent-to-agent commerce. It's all converging on x402, Coinbase's protocol for machine-native payments. Now agents can pay each other in stablecoins at the HTTP layer, and they can do it in real time on Sei. Jay breaks it down with FINTECH.TV ↓

Sei

16,859 views • 6 months ago

LIVE NOW -- x402 & The Agentic Internet | Lincoln Murr In our twelfth talk of the Bankless Summit, Coinbase 🛡️ product lead lincoln.base.eth explains how x402 revives the long-dormant internet payment standard and why the rise of AI agents makes it newly essential. He outlines how agents will consume and pay for services across the web, why internet native payments need stablecoin rails, and how x402 can unlock agentic commerce at global scale by giving both humans and bots a simple, universal way to send value online. ----- [Bankless Summit in partnership with M0]

LIVE NOW -- x402 & The Agentic Internet | Lincoln Murr In our twelfth talk of the Bankless Summit, Coinbase 🛡️ product lead lincoln.base.eth explains how x402 revives the long-dormant internet payment standard and why the rise of AI agents makes it newly essential. He outlines how agents will consume and pay for services across the web, why internet native payments need stablecoin rails, and how x402 can unlock agentic commerce at global scale by giving both humans and bots a simple, universal way to send value online. ----- [Bankless Summit in partnership with M0]

Bankless

31,394 views • 8 months ago

The DEFINITIVE guide to x402! 🚀 In the Season 2 premiere of CDPod, yuga.eth 🛡 and erik.eth 🛡 discuss the x402 lore and origin story, the future of fully autonomous agents, killing the API key, and more. Timestamps: 0:00 - Intro 1:23 - How x402 got on our radar 3:53 - History of the internet and HTTP 101 12:26 - What we need for AI coming online and what we learned from mobile 15:55 - The issue of online payments and what blockchain solves 18:27 - The 402 Status Code 19:19 - What is x402 20:25 - x402 flow walkthrough (server to client) 25:28 - Why x402 champions open standards and multiple payment types 27:33 - x402 demo 29:04 - Where AI fits in and why now, especially for payments and pay-per-crawl 35:27 - Why AGI payments need standardization 36:34 - AI on x402 demo (Payments MCP + x402 Bazaar) 38:34 - Shopping on x402 demo (Content/endpoint discovery) 41:18 - The power of stablecoins for micro- and macro-payments 42:22 - x402 main adoption roadblocks (supply and demand) 44:13 - Payments MCP, Cloudflare and network effects 45:53 - What’s next and x402 v2 46:53 - Where to find more

The DEFINITIVE guide to x402! 🚀 In the Season 2 premiere of CDPod, yuga.eth 🛡 and erik.eth 🛡 discuss the x402 lore and origin story, the future of fully autonomous agents, killing the API key, and more. Timestamps: 0:00 - Intro 1:23 - How x402 got on our radar 3:53 - History of the internet and HTTP 101 12:26 - What we need for AI coming online and what we learned from mobile 15:55 - The issue of online payments and what blockchain solves 18:27 - The 402 Status Code 19:19 - What is x402 20:25 - x402 flow walkthrough (server to client) 25:28 - Why x402 champions open standards and multiple payment types 27:33 - x402 demo 29:04 - Where AI fits in and why now, especially for payments and pay-per-crawl 35:27 - Why AGI payments need standardization 36:34 - AI on x402 demo (Payments MCP + x402 Bazaar) 38:34 - Shopping on x402 demo (Content/endpoint discovery) 41:18 - The power of stablecoins for micro- and macro-payments 42:22 - x402 main adoption roadblocks (supply and demand) 44:13 - Payments MCP, Cloudflare and network effects 45:53 - What’s next and x402 v2 46:53 - Where to find more

Coinbase Developer Platform🛡️

24,553 views • 9 months ago

🤖💰 BREAKING: World's First AI-Human Collaborative Stablecoin Payment by Multisig Live on We just demonstrated AI agents making real payments with human oversight using the x402 protocol with our multisig wallet. Here's how it works: #x402 #AI

🤖💰 BREAKING: World's First AI-Human Collaborative Stablecoin Payment by Multisig Live on We just demonstrated AI agents making real payments with human oversight using the x402 protocol with our multisig wallet. Here's how it works: #x402 #AI

zCloak Network

20,292 views • 9 months ago

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.

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.

Stacy Muur

12,199 views • 5 months ago

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.

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.

Vitto Rivabella

40,436 views • 8 months ago

Introducing Simmer - our x402 hackathon submission. AI-native prediction markets where AI agents autonomously trade and pay for their own intelligence via x402 Each agent gets its own wallet. It decides when to use tools (news, price feeds, real-time data, etc). You can run an agent for as little as $0.1 for 10 trades. Try it now

Introducing Simmer - our x402 hackathon submission. AI-native prediction markets where AI agents autonomously trade and pay for their own intelligence via x402 Each agent gets its own wallet. It decides when to use tools (news, price feeds, real-time data, etc). You can run an agent for as little as $0.1 for 10 trades. Try it now

Spartan Labs

21,944 views • 7 months ago

A builder wants to ship an agent that can search live data, use it instantly, and keep going without manual steps. That is why OptimAI Search now ships with x402, SDK, and MCP support. x402 makes access and payment seamless. SDK and MCP make integration straightforward for builders. And under the hood, OptimAI Search gives agents real-time access to huge volumes of public and social web data, structured into context they can actually use. Add Agent Marketplace on top, and domain knowledge becomes reusable: build specialized agents, publish them, and let others build on what you create. This is what search looks like in the agent-native internet. 💡Try it:

A builder wants to ship an agent that can search live data, use it instantly, and keep going without manual steps. That is why OptimAI Search now ships with x402, SDK, and MCP support. x402 makes access and payment seamless. SDK and MCP make integration straightforward for builders. And under the hood, OptimAI Search gives agents real-time access to huge volumes of public and social web data, structured into context they can actually use. Add Agent Marketplace on top, and domain knowledge becomes reusable: build specialized agents, publish them, and let others build on what you create. This is what search looks like in the agent-native internet. 💡Try it:

OptimAI Network

36,499 views • 3 months ago

$x402 isn’t “a payment protocol”… It’s pay-per-API for the agent economy. “you hit an API and it gives you a 402 error…” …and your bot instantly sends “a fraction of a fraction of a cent in USDC” to unlock the data. “All of that happens at lightspeed.” - Austin Griffith$

x402 isn’t “a payment protocol”… It’s pay-per-API for the agent economy. “you hit an API and it gives you a 402 error…” …and your bot instantly sends “a fraction of a fraction of a cent in USDC” to unlock the data. “All of that happens at lightspeed.” - Austin Griffith

Bankless

26,977 views • 6 months ago

you can now tip your favorite posts directly via x402 on fetchr. powered by Bankr x402 cloud. fetchr is a search engine that features x402 powered agentic payments, a built in streaming protocol, and a reddit style community focused on all things ai. it also includes claude powered news and media, an x402 enabled crypto wallet, agentic games, and an ai discovery tool. features functional: > agentic search tool > community > tipping creators on community via x402 > claude powered news and media > submit an agent for just $5 via x402 > monetize your agent > personal notes > 2D games (experimental beta) > deals, offers, affiliates features live soon: > 3-card streaming protocol with tipping features > crypto wallet powered by x402 built for agents > ai gaming and vr the web terminal is still in beta v1 and its mostly optimised for mobile aswell. thanks for all the support with x402 and cloud deployer Igor Yuzovitskiy

you can now tip your favorite posts directly via x402 on fetchr. powered by Bankr x402 cloud. fetchr is a search engine that features x402 powered agentic payments, a built in streaming protocol, and a reddit style community focused on all things ai. it also includes claude powered news and media, an x402 enabled crypto wallet, agentic games, and an ai discovery tool. features functional: > agentic search tool > community > tipping creators on community via x402 > claude powered news and media > submit an agent for just $5 via x402 > monetize your agent > personal notes > 2D games (experimental beta) > deals, offers, affiliates features live soon: > 3-card streaming protocol with tipping features > crypto wallet powered by x402 built for agents > ai gaming and vr the web terminal is still in beta v1 and its mostly optimised for mobile aswell. thanks for all the support with x402 and cloud deployer Igor Yuzovitskiy

0xExodus

16,133 views • 4 months ago

Are AI agents going to take over Ethereum? In episode 19 of the Agents Unleashed podcast, explore the Base vision for autonomous AI on Ethereum, and find out what AI can do at the fringes of physics. In this episode: - Base’s HTTP x402 (machine payments) and Olas - How the Olas ecosystem enables millions of agent-to-agent transactions, including payments via Nevermined - AI’s weird and wonderful physics discovery & what it means for ownable agents - How OpenLedger gives data contributors credit 01:28 - Base’s vision for autonomous AI 02:45 - Fact check: are AI agents “broke”? 03:32 - What the Mech Marketplace already does 05:31 - How HTTP x402 fits in with Olas 07:30 - Novel physics, discovered by AI 09:04 - Examples from earlier science 09:50 - What OpenLedger enables 10:38 - What it all means for user-owned AI This episode is sponsored by Sigil Fund.

Are AI agents going to take over Ethereum? In episode 19 of the Agents Unleashed podcast, explore the Base vision for autonomous AI on Ethereum, and find out what AI can do at the fringes of physics. In this episode: - Base’s HTTP x402 (machine payments) and Olas - How the Olas ecosystem enables millions of agent-to-agent transactions, including payments via Nevermined - AI’s weird and wonderful physics discovery & what it means for ownable agents - How OpenLedger gives data contributors credit 01:28 - Base’s vision for autonomous AI 02:45 - Fact check: are AI agents “broke”? 03:32 - What the Mech Marketplace already does 05:31 - How HTTP x402 fits in with Olas 07:30 - Novel physics, discovered by AI 09:04 - Examples from earlier science 09:50 - What OpenLedger enables 10:38 - What it all means for user-owned AI This episode is sponsored by Sigil Fund.

Olas (formerly Autonolas)

12,136 views • 11 months ago

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.

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

138,795 views • 9 months ago

Just shipped something with MCPay (now Frames) that changes the game for MCP servers. Now any tool in your server can accept stablecoin payments via x402 on Polygon in minutes. No complex integrations. No payment headaches. Just plug, pay, and go. Watch the demo 🎥

Just shipped something with MCPay (now Frames) that changes the game for MCP servers. Now any tool in your server can accept stablecoin payments via x402 on Polygon in minutes. No complex integrations. No payment headaches. Just plug, pay, and go. Watch the demo 🎥

Polygon Ecosystem

21,404 views • 9 months ago

My agent is now paying for its own data. No API key. No account. No credit card. Check the video I recorded. This uses the x402 open protocol built by Coinbase, along with a simple skill. This is an open protocol governed by the Linux Foundation. To complete a goal, an agent can now search for an actor on the Apify Store, pay for it, and use it without any human intervention. The way it works is pretty simple: 1. Your agent finds an Actor it wants to use 2. It sends a request 3. The Actor sends back an HTTP 402 "Payment Required" response 4. Agent authorizes payment from a wallet in USDC on Base 5. The Actor runs 6. User receives the result The model is pay-as-you-go: the agent authorizes a spending ceiling, pays only for usage, and the remaining balance is automatically settled. This brings an entire marketplace of AI tools into the agentic economy. Here is the skill you need. Add it to your agent, and it will take care of everything for you: If you want to know how this works, including what you can do with $1, read this post: Thanks to the Apify team for partnering with me on this post.

My agent is now paying for its own data. No API key. No account. No credit card. Check the video I recorded. This uses the x402 open protocol built by Coinbase, along with a simple skill. This is an open protocol governed by the Linux Foundation. To complete a goal, an agent can now search for an actor on the Apify Store, pay for it, and use it without any human intervention. The way it works is pretty simple: 1. Your agent finds an Actor it wants to use 2. It sends a request 3. The Actor sends back an HTTP 402 "Payment Required" response 4. Agent authorizes payment from a wallet in USDC on Base 5. The Actor runs 6. User receives the result The model is pay-as-you-go: the agent authorizes a spending ceiling, pays only for usage, and the remaining balance is automatically settled. This brings an entire marketplace of AI tools into the agentic economy. Here is the skill you need. Add it to your agent, and it will take care of everything for you: If you want to know how this works, including what you can do with $1, read this post: Thanks to the Apify team for partnering with me on this post.

Santiago

26,589 views • 1 month ago

x402 is now scalable to millions of agents. If you provide x402 endpoints, you can install our SDK for free to gain observability, agent traffic, and the ability to refund payments when an endpoint delivers a bad response. Agents will run the online world. We make it possible.

x402 is now scalable to millions of agents. If you provide x402 endpoints, you can install our SDK for free to gain observability, agent traffic, and the ability to refund payments when an endpoint delivers a bad response. Agents will run the online world. We make it possible.

zauth

21,132 views • 6 months ago

x402 is now live on OOBE. We finally revealed the Synapse x402 Explorer, showing how pay-per-request payments for RPCs and APIs actually work on-chain: Synapse enables instant settlement per request via the PayAI Network | x402 Facilitator facilitator, connecting agents and merchants through a fully on-chain, verifiable payment flow. No subscriptions, no cards, no intermediaries. Watch the video and follow the thread below to understand how it actually works 👇

x402 is now live on OOBE. We finally revealed the Synapse x402 Explorer, showing how pay-per-request payments for RPCs and APIs actually work on-chain: Synapse enables instant settlement per request via the PayAI Network | x402 Facilitator facilitator, connecting agents and merchants through a fully on-chain, verifiable payment flow. No subscriptions, no cards, no intermediaries. Watch the video and follow the thread below to understand how it actually works 👇

OOBE PROTOCOL

19,516 views • 7 months ago