Integrate x402 for Internet-Native Micropayments

We implement x402 for autonomous micropayments—enabling AI agents, IoT devices, and applications to pay for APIs and services without accounts or API keys.

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x402 for internet-native micropayments

Traditional payment systems require AI agents to maintain accounts, API keys, and subscriptions. x402 uses HTTP 402 status codes and blockchain micropayments for pay-per-use transactions. AI agents send requests, receive payment requirements, pay with stablecoins, and get immediate access. Cloudflare’s Agents SDK and Coinbase’s AgentKit natively support x402, enabling API monetization, AI agent commerce, and machine-to-machine payments.

Our capabilities include:

x402 protocol implementation & integration
AI agent payment wallet configuration
API monetization with pay-per-use pricing
Blockchain payment verification systems
Stablecoin transaction handling (USDC, Base)
Machine-to-machine payment automation

Who we support

x402 suits companies building AI agents requiring autonomous payments or monetizing APIs with pay-per-use models. We work with organizations exploring blockchain micropayments or machine-to-machine commerce.

Companies Building AI Agents

Your AI agents need to autonomously pay for API access, data, or compute resources without human intervention. x402 integration enables agents to make micropayments per request, eliminating account setup, API key management, and pre-funded balances.

API Providers Monetizing Services

You provide APIs and want pay-per-call monetization instead of subscriptions. x402 lets you charge micropayments for each request—data APIs, AI services, or compute resources—enabling new revenue models without payment processors.

Companies Exploring Agentic Commerce

You're building machine-to-machine payment systems for IoT devices, autonomous services, or AI-driven marketplaces. x402 enables frictionless micropayments between systems without intermediaries, accounts, or traditional payment infrastructure.

Ways to engage

We offer a wide range of engagement models to meet our clients’ needs. From hourly consultation to fully managed solutions, our engagement models are designed to be flexible and customizable.

Staff Augmentation

Get access to on-demand product and engineering team talent that gives your company the flexibility to scale up and down as business needs ebb and flow.

Retainer Services

Retainers are perfect for companies that have a fully built product in maintenance mode. We'll give you peace of mind by keeping your software running, secure, and up to date.

Project Engagement

Project-based contracts that can range from small-scale audit and strategy sessions to more intricate replatforming or build from scratch initiatives.

We'll spec out a custom engagement model for you

Invested in creating success and defining new standards

At Curotec, we do more than deliver cutting-edge solutions — we build lasting partnerships. It’s the trust and collaboration we foster with our clients that make CEOs, CTOs, and CMOs consistently choose Curotec as their go-to partner.

Helping a Series B SaaS company refine and scale their product efficiently

Why choose Curotec for x402 implementation?

We implement x402 protocol with secure AI agent wallet configuration, payment verification systems, and blockchain transaction integration. We handle stablecoin payments on Base/Layer 2 networks, create pay-per-use API models, and manage complex autonomous payment systems for AI agents.

1 Extraordinary people, exceptional outcomes

Our outstanding team represents our greatest asset. With business acumen, we translate objectives into solutions. Intellectual agility drives efficient software development problem-solving. Superior communication ensures seamless teamwork integration.

2 Deep technical expertise

We don’t claim to be experts in every framework and language. Instead, we focus on the tech ecosystems in which we excel, selecting engagements that align with our competencies for optimal results. Moreover, we offer pre-developed components and scaffolding to save you time and money.

3 Balancing innovation with practicality

We stay ahead of industry trends and innovations, avoiding the hype of every new technology fad. Focusing on innovations with real commercial potential, we guide you through the ever-changing tech landscape, helping you embrace proven technologies and cutting-edge advancements.

4 Flexibility in our approach

We offer a range of flexible working arrangements to meet your specific needs. Whether you prefer our end-to-end project delivery, embedding our experts within your teams, or consulting and retainer options, we have a solution designed to suit you.

Key x402 capabilities for micropayments

Autonomous Payment Flow

Enable AI agents to request resources, handle HTTP 402 responses, execute blockchain transactions, and retry requests autonomously.

Wallet & Key Management

Configure crypto wallets for AI agents with secure key storage, delegated authorization, and transaction signing capabilities for autonomous payments.

Pay-Per-Use API Monetization

Implement payment requirements for API endpoints defining prices, accepted tokens, and wallet addresses for instant micropayment collection per request.

Blockchain Transaction Verification

Verify on-chain payments through facilitator services, confirm transaction settlement, and validate payment details before granting resource access.

Stablecoin Payment Processing

Process payments in USDC or stablecoins across Base, Ethereum, or Solana—enabling fast, low-fee transactions with predictable pricing.

Deferred Payment Aggregation

Aggregate multiple small transactions into periodic settlements, reducing blockchain costs for high-frequency API users while maintaining pay-per-use pricing flexibility.

Tools & technologies for x402 integration

x402 Protocol Implementation

We integrate x402 protocol into APIs and applications, implementing HTTP 402 responses with payment requirements.

HTTP 402 Response Handling – Implement server-side logic returning HTTP 402 “Payment Required” status codes with payment details including amount, recipient wallet address, and accepted tokens in response bodies.
Payment Request Formatting – Structure payment requirement responses with JSON payloads specifying price, supported cryptocurrencies, blockchain networks, and wallet addresses for client payment processing.
X-PAYMENT Header Processing – Parse and validate X-PAYMENT headers containing signed payment authorization payloads that clients include when retrying requests after payment execution.
Client SDK Integration – Integrate x402 client libraries enabling applications and AI agents to automatically detect 402 responses, execute payments, and retry requests with payment proofs.
Payment Middleware Development – Build middleware functions wrapping API endpoints with x402 payment requirements, automatically enforcing payment before granting access to protected resources.
Protocol Version Management – Implement version compatibility handling for x402 protocol updates, managing transitions between protocol versions and maintaining backward compatibility where possible.

Blockchain Wallet Configuration

Our team configures crypto wallets for AI agents with secure key management and transaction signing capabilities.

AI Agent Wallet Setup – Configure cryptocurrency wallets for AI agents using services like Coinbase Wallet SDK or MetaMask, enabling autonomous transaction signing and payment execution.
Private Key Management – Implement secure key storage using hardware security modules (HSMs), encrypted key vaults, or cloud KMS services preventing unauthorized access to agent wallet credentials.
Delegated Authorization – Configure delegated signing mechanisms like ERC-7710 allowing AI agents limited payment authority without exposing master private keys or compromising wallet security.
Multi-Signature Wallets – Set up multi-sig wallets requiring multiple approvals for high-value transactions, adding security layers for autonomous agent payments above threshold amounts.
Wallet Funding & Balance Management – Implement automated wallet funding systems monitoring balances, triggering refills when low, and alerting administrators about insufficient funds for agent operations.
Transaction Signing Automation – Configure automated transaction signing for AI agents evaluating payment requests, validating amounts and recipients, and executing blockchain transactions programmatically.

Smart Contract Integration

We implement smart contracts for payment verification, escrow, and automated settlement on blockchain networks.

Payment Verification Contracts – Deploy smart contracts verifying on-chain payment completion, validating transaction amounts, sender addresses, and recipient wallets before authorizing resource access.
Escrow Contract Implementation – Create escrow smart contracts holding payments until service delivery confirmation, releasing funds automatically when conditions are met or enabling dispute resolution.
Automated Settlement Logic – Implement smart contracts automatically distributing payments to multiple parties, handling revenue splits, platform fees, or affiliate commissions without manual intervention.
Payment Threshold Enforcement – Deploy contracts enforcing minimum payment amounts, rate limits, or usage quotas, preventing abuse while enabling legitimate micropayment transactions.
Refund & Dispute Mechanisms – Build smart contract logic handling payment refunds for failed services, implementing time-locked disputes, and managing resolution workflows on-chain.
Cross-Chain Payment Bridges – Implement bridge contracts enabling payment verification across multiple blockchain networks, supporting payments on Ethereum, Base, Solana, or other Layer 2 solutions.

Payment Facilitator Services

Curotec integrates payment facilitators verifying on-chain transactions and confirming settlement before resource access.

Coinbase Facilitator Integration – Integrate Coinbase’s x402 facilitator service for payment verification, delegating blockchain monitoring and transaction confirmation to managed infrastructure.
Transaction Verification APIs – Connect to facilitator APIs that verify payment authenticity, check blockchain settlement status, and validate payment amounts before granting API access.
Payment Proof Validation – Implement validation logic checking signed payment proofs from X-PAYMENT headers against facilitator services, ensuring payments are legitimate and properly executed.
Settlement Confirmation Handling – Configure settlement confirmation thresholds determining when payments are considered final, balancing speed with security based on blockchain finality requirements.
Facilitator Webhook Integration – Set up webhook endpoints receiving real-time payment notifications from facilitator services, triggering resource access or business logic upon confirmed payments.
Fallback Verification Systems – Implement backup verification methods for facilitator service outages, including direct blockchain queries or cached validation to maintain service availability.

Stablecoin Transaction Handling

We configure stablecoin payments across Base, Ethereum, and Solana for fast, low-fee micropayment processing.

USDC Payment Integration – Configure USDC stablecoin payments as the primary transaction currency, providing price stability and predictable costs for AI agent micropayments.
Multi-Chain Token Support – Implement payment handling across Base, Ethereum mainnet, Polygon, and Solana networks, allowing flexibility in blockchain selection based on fees and speed.
Layer 2 Optimization – Configure payments on Layer 2 networks like Base or Arbitrum for near-zero transaction fees and instant settlement, making sub-cent micropayments economically viable.
Token Balance Monitoring – Implement real-time balance tracking for AI agent wallets across multiple chains, alerting when stablecoin balances fall below operational thresholds.
Gas Fee Management – Configure gas fee strategies for blockchain transactions, implementing dynamic fee pricing and fee sponsorship models to optimize transaction costs.
Currency Conversion Handling – Build systems converting between different stablecoins or cryptocurrencies when needed, supporting payments in various tokens while settling in preferred currencies.

API Monetization Architecture

Our developers build pay-per-use pricing models, usage tracking, and payment enforcement for monetizing API endpoints.

Dynamic Pricing Models – Implement flexible pricing strategies charging per API call, by data volume, compute time, or resource complexity with real-time price calculations.
Usage Metering & Tracking – Build metering systems tracking API consumption, recording request counts, data transfer volumes, and resource usage for accurate payment calculation.
Payment Gateway Integration – Connect API endpoints to x402 payment gateways, automatically returning 402 responses with payment requirements when unpaid requests arrive.
Rate Limiting by Payment – Implement rate limiting tied to payment status, allowing higher request volumes for paid users while restricting unpaid or free-tier access.
Revenue Analytics & Reporting – Build dashboards tracking micropayment revenue, popular endpoints, customer acquisition costs, and monetization metrics for API business intelligence.
Batch Payment Optimization – Configure batch payment settlement for high-frequency API users, aggregating multiple small transactions into periodic settlements reducing blockchain transaction costs.

FAQs about x402 protocol integration

Is x402 ready for production use?

x402 launched in May 2025 and lacks formal security audits. It’s suitable for experimental projects and pilot programs but not mission-critical payment systems yet. A V2 upgrade is planned to address architectural issues. We recommend starting with low-risk use cases while the protocol matures.

What blockchains does x402 support?

x402 is blockchain-agnostic but primarily runs on Base (Coinbase’s Layer 2). We can implement on Ethereum, Solana, Polygon, or other networks supporting stablecoins like USDC. Base offers the lowest fees and fastest settlement for micropayments under 1 cent.

How do AI agents securely manage crypto wallets?

We configure wallets with delegated authorization to limit agent spending, secure key storage (HSMs/cloud KMS), and automated balance monitoring. Multi-signature wallets can require human approval for transactions over thresholds, balancing autonomy with security.

What are the transaction costs?

Transaction costs depend on the blockchain. Base Layer 2 enables micropayments under 1 cent with near-zero gas fees. Ethereum mainnet costs are higher but unnecessary for most x402 use cases. Stablecoin payments eliminate cryptocurrency volatility affecting pricing predictability.

Can we monetize existing APIs with x402?

We add x402 middleware to existing APIs. Your API returns 402 responses with payment requirements. Clients pay with stablecoins, and you grant access after verification. This enables pay-per-call monetization, replacing subscriptions or API keys.

What happens during blockchain network issues?

Payment verification fails if blockchain networks have outages or congestion. We implement fallback verification, cached validation, and graceful degradation ensuring service availability. For critical applications, we recommend hybrid payment systems supporting both x402 and traditional methods during blockchain disruptions.

Does x402 work with other payment protocols?

Yes. x402 is composable, working with emerging protocols like ATXP (Agent Transaction Protocol) and AP2 (authorization primitives). This interoperability means x402 integrates with broader AI agent payment ecosystems as standards evolve, avoiding an isolated solution.

Ready to have a conversation?

We’re here to discuss how we can partner, sharing our knowledge and experience for your product development needs. Get started driving your business forward.