Protocol Guides
One SDK. Multiple Protocols. Zero Vendor Lock-in.
SettleGrid integrates the major AI agent payment protocols. Wrap your tool once to reach agents across the Anthropic, Google, Stripe, Visa, Mastercard, Coinbase, OpenAI, Circle, Shopify, Lightning Labs, Ant Group, and Skyfire ecosystems.
MCP
ProductionAnthropic
The open standard for connecting AI assistants to external tools and data.
MPP
PendingStripe + Tempo
Autonomous machine-to-machine payments backed by Stripe infrastructure.
x402
ProductionCoinbase
On-chain USDC payments via HTTP 402 for trustless machine commerce.
AP2
PendingBudget-capped credentials for AI agents in Google's partner ecosystem.
Visa TAP
PendingVisa
Tokenized agent payments backed by Visa's global payment network.
UCP
PendingGoogle + Shopify
Universal checkout for AI agents — discover, negotiate, and purchase services.
ACP
ReadyOpenAI + Stripe
Seamless agent-to-service commerce powered by OpenAI and Stripe.
Mastercard Verifiable Intent
PendingMastercard
Verified intent-based payments preventing unauthorized agent spending.
Circle Nanopayments
TestnetCircle (USDC)
Sub-cent USDC micropayments via payment channels for AI workloads.
REST
ProductionAny HTTP API
Per-call billing for any HTTP endpoint — Express, Next.js, Fastify, and more.
L402
TestnetLightning Labs
Bitcoin Lightning micropayments with macaroon authentication — pseudonymous, per-request.
ACTP
PendingAnt Group / Alipay
Delegated authorization for agentic commerce across Alipay's user base.
KYAPay
ReadySkyfire + Visa
JWT-based verified agent identity + payment — the fastest protocol in the stack.
EMVCo
PendingVisa + MC + Amex + Discover + JCB + UnionPay
Global card-based agent payment standard with 3-D Secure and tokenisation.
DRAIN
TestnetBittensor / Handshake58
Off-chain USDC micropayments via EIP-712 vouchers on Polygon — $0.0001 per request.
All protocols use the same sg.wrap() interface. No protocol-specific code required.