Best Alternatives to POPCORN MCP

Stripe AI

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MCP server integrating with Stripe - tools for customers, products, payments, and more.

Budget-capped x402 payments for AI agents: verifiable receipts, trust routing, 17 free tools.

Blackwall X402 Guardrail

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Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.

Httpayer MCP

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x402 micropayments for AI agents — credits-based, no wallets, no blockchain.

TrustBench

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x402 provider rankings + Ed25519-signed payment receipts + signature verification (3 tools).

Deterministic signed verification of numeric & financial claims for AI agents & spreadsheets.

Hash, encode, UUID, password analysis for AI agents

Drillr — The financial MCP for AI agents

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The financial MCP for AI agents - 90+ financial tables, SEC filings, signals, alt-data.

Blackwall X402 Guardrail

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Pre-signature x402 payment verdict (GO/HOLD/STOP) for AI agents, with a verifiable signed receipt.

Headless Oracle

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Cryptographically signed market state verification for autonomous financial agents.

WingmanProtocol Agent Gateway

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Async errands, artifact hosting, watches, memory + 15 calculators for AI agents. x402 on Base.

XFuel

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Submit AI inference to XFuel, pay per task (USDC via x402 or TFUEL), fetch/verify ZK proofs.