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x402

x402 is an open protocol using the HTTP 402 status code to let software agents pay per API call in stablecoins like USDC, without accounts or pre-funding.

Known aliases

  • Binance x402
  • HTTP 402
  • HTTP 402 payment convention
  • HTTP 402 payment protocol
  • HTTP 402 Payment Required
  • HTTP 402 payments
  • @x402/core
  • x402 exact scheme
  • @x402/fetch
  • x402 Foundation
  • x402 payment standard
  • x402 protocol
  • x402 SDK
  • x402 specification
  • x402 standard
  • x402 v2
  • x402Version 2
  • X-PAYMENT

Current stories

investConfirmed6 publishers

Chainalysis counts 138 million x402 agent payments, most of them worth 10 cents or less

Chainalysis counted more than 138 million agent payments through x402 on Base, over 87% of them worth 10 cents or less. CoinDesk noted that transaction counts alone do not establish how much is genuine commercial demand.

Perspective Coverage

7 publishers
Builder
Builder 33%
Operator
Operator 25%
Investor
Investor 42%

Reality

Evidence55
Adoption38
Hype gap+30
Incentives
Not scored
Confidence62
productOne report1 publisher

XDC AI agents can now carry a badge saying a passport-checked owner stands behind them

XDC Network has named Concordium the exclusive identity provider for XDC AI, letting agents show a passport-checked owner stands behind them. A buyer cannot yet assume every agent has one.

Publishers:thenextweb.com

Reality

Evidence25
Adoption
Not scored
Hype gap+35
Incentives80
Confidence50
investConfirmed6 publishers

Stripe's Privy adds XRP Ledger wallets as Ripple cites 13 million agent payments it counted itself

Stripe-owned Privy is bringing its wallets to the XRP Ledger, where Ripple says agents have made 13 million payments. Ripple is the only source for that count. The announcements leave developers free to settle in XRP or in other assets.

Perspective Coverage

6 publishers
Builder
Builder 42%
Operator
Operator 27%
Investor
Investor 31%

Reality

Evidence35
Adoption20
Hype gap+40
Incentives70
Confidence62
investOne report1 publisher

XRP Ledger's 13.5 million AI-agent payments have settled 12,010 RLUSD and 6,982 XRP

XRP Ledger payments by AI agents over the x402 protocol passed 13 million across 166 merchants, RippleX engineering head J. Ayo Akinyele said on October 10. On the tracker run by Ripple-backed t54, they have settled less than one RLUSD per thousand payments, so merchants are getting traffic with very little income behind it so far.

Publishers:crypto.news

Reality

Evidence45
Adoption25
Hype gap+55
Incentives80
Confidence55
investOne report1 publisher

RBA submissions find chargeback liability unclear when AI agents exceed their authority

Merchants, issuers and payment firms among 75 RBA submitters said chargeback liability is unclear when an AI agent exceeds its authority. Amazon's AgentCore Payments already lets agents pay in stablecoins, so for now merchants and networks are left to price the risk of a disputed order.

Publishers:cryptoslate.com

Reality

Evidence50
Adoption20
Hype gap+25
Incentives70
Confidence45
investOne report1 publisher

Mysten Labs and Google Cloud split AI agent audit trails between customer buckets and Sui

Mysten Labs and Google Cloud launched an audit layer for AI agents on October 6, ahead of EU AI Act fines of up to 3% of global turnover from 2027. Agent logs stay in customer-controlled Google storage and only the proofs go to Sui and Walrus, with no price or customer yet disclosed.

Reality

Evidence35
Adoption
Not scored
Hype gap+35
Incentives60
Confidence40
investConfirmed3 publishers

ARK backs Cathie Wood's agent-spending thesis with $24.7 million of CoreWeave shares

ARK Invest bought about $24.7 million of CoreWeave shares days before Cathie Wood urged investors to track where AI agents spend money. For now ARK's money is on the compute agents consume, and the fight over which payment network they use is still being argued in papers and protocols.

Perspective Coverage

3 publishers
Builder
Builder 24%
Operator
Operator 28%
Investor
Investor 48%

Reality

Evidence45
Adoption20
Hype gap+40
Incentives65
Confidence55
investOne report1 publisher

XRP Ledger x402 payments near 12 million as Ripple credits AI agent demand

XRP Ledger x402 payments ran at about 525,000 a day over the latest week, taking the total from 1 million in July to 11,965,947 by Oct. 3. The count shows software paying for services at volume, but it is a tally of payments published without a dollar value.

Publishers:news.bitcoin.com

Reality

Evidence40
Adoption40
Hype gap+35
Incentives80
Confidence40
buildOne report1 publisher

A listed seller finds stale prices in its own row of Coinbase's 2,980-service x402 index

Minia2a checked its row in Coinbase's Agentic.market against its live 402 challenges and found two of its 20 endpoint prices frozen at values it no longer charges. Every endpoint still answered with the standard x402 challenge, so the payment rail held and the drift sat in the crawled listing.

Publishers:dev.to

Reality

Evidence40
Adoption35
Hype gap+15
Incentives70
Confidence40
buildOne report1 publisher

Agents paying over x402 still need spend controls their own teams write

The Linux Foundation named payments executive Michael Hursta to run the 50-plus-member x402 Foundation on October 1, 2026. A vendor's post says conformance still means only a valid signature, so agent teams have to write their own approval logic.

Publishers:dev.to

Reality

Evidence30
Adoption40
Hype gap+30
Incentives80
Confidence30
buildConfirmed3 publishers

Cloudflare opens a closed beta that bills AI agents per request over HTTP 402

Cloudflare put its Monetization Gateway into closed beta, letting domain owners charge AI agents per request via HTTP 402, with four use cases in production. Cloudflare scopes it to APIs, tools and data, where each request is a single use.

Perspective Coverage

3 publishers
Builder
Builder 58%
Operator
Operator 22%
Investor
Investor 20%

Reality

Evidence60
Adoption20
Hype gap+20
Incentives70
Confidence60
buildOne report1 publisher

Live MCP servers trail the stateless 2026-07-28 revision that clients already ship

Pennyforge found 7 of 72 responding MCP registry endpoints on the stateless 2026-07-28 revision that clients already ship. Servers answer with whatever in-range version a client offers, so a client learns what one supports only by offering the newest revision and reading the reply.

Publishers:dev.to

Reality

Evidence55
Adoption9
Hype gap+15
Incentives
Not scored
Confidence45
investConfirmed2 publishers

Petrobras tests Cardano to keep jet fuel emissions benefits from being claimed twice

Petrobras is testing the Cardano blockchain in two research projects that track emissions claims on sustainable jet fuel and renewable diesel. With no fuel volumes or timeline attached, the test cannot yet be sized against Shell's Avelia registry, credited with more than 84 million gallons since 2022.

Reality

Evidence45
Adoption12
Hype gap+25
Incentives70
Confidence60
buildOne report1 publisher

MCP's September 28 release lets any server behind a load balancer answer any request

Agentic AI Foundation's September 28 MCP release finalizes stateless servers and bars removing deprecated features before July 2027. Teams moving servers off sessions now have a dated floor to plan migrations against.

Publishers:dev.to

Reality

Evidence35
Adoption
Not scored
Hype gap+30
Incentives55
Confidence30
investOne report1 publisher

Each x402 payment by an AI agent triggers a full US tax calculation

Coinbase's x402 lets AI agents pay in USDC for under $0.001 a transaction, yet CryptoBriefing reports US rules make every payment a taxable event. Coinbase has not formally addressed the reporting load, so each agent's cost-basis records become its deployer's job.

Reality

Evidence35
Adoption
Not scored
Hype gap+30
Incentives40
Confidence35
buildOne report1 publisher

x402's Bazaar catalog refreshes a listed price only when a buyer pays

One operator's sweep of x402's Bazaar catalog found 20 of its 154 listings showing stale prices, including a $50 code audit listed at $0.01. Rows change only when a payment settles, so agents have to price from the live 402 challenge.

Publishers:dev.to

Reality

Evidence55
Adoption25
Hype gap+5
Incentives
Not scored
Confidence50
investConfirmed2 publishers

Block's Lightning work gives the x402 agent-payment standard a bitcoin rail beside stablecoins

Block joined the x402 Foundation on Sept. 24 and is adding Bitcoin Lightning to the agent-payment protocol Coinbase built for stablecoins. The move puts a second settlement asset, and a second large payments company, into a standard its creator handed to the Linux Foundation this year.

Reality

Evidence50
Adoption15
Hype gap+35
Incentives70
Confidence60
buildOne report1 publisher

Header pricing in x402 v2 and MCP 2026-07-28 leaves spend approval for enterprises to build

Prakash Rao and Marco Gonzalez say x402 v2 and MCP 2026-07-28 expose a tool call's price to the gateway but leave undefined who may approve the spend. Their demo treats the agent as hostile, so the budget check must sit out of its reach.

Publishers:dev.to

Reality

Evidence45
Adoption
Not scored
Hype gap+10
Incentives35
Confidence40
buildOne report1 publisher

x402 turns a paid API call into a 402 retry with two headers and a USDC transfer

The published client retries a 402 by signing a USDC transfer on Base and stuffing the transaction hash into a header. It works inside an ordinary httpx call, and it blocks for about three seconds before the retry goes out.

Publishers:dev.to

Reality

Evidence40
Adoption
Not scored
Hype gap+30
Incentives
Not scored
Confidence45

Earlier coverage

  1. TRM sizes this year's AI agent payments on x402 at $4 million at the outside

    Invest · September 23, 2026 · Confirmed3 publishers