"X" matching MCP connectors:

Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.

Keyless x402 crypto intel + pre-trade safety: signed SAFE/CAUTION/BLOCK, $0.02. 222 tools, Base

Pay for HTTP APIs and charge for your own: x402 micropayments in USDC on Base.

Pre-signature x402 payment-risk oracle. AI agents call forecast_payment before paying a counterparty and get a GO / HOLD / STOP verdict from settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions screening — plus a third-party-verifiable Ed25519 signed receipt. Verdict only; never takes custody. Free under $10 at risk; returns an x402 payment challenge over that.

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

Pay-per-call JSON repair + JSON Schema validation for AI agents (USDC on Base, x402).

KoSIT-verified German e-invoices: generate & validate ZUGFeRD, Factur-X, XRechnung, EN 16931.

EN 16931-compliant e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS, Facturae or US PDF. Free.

Search the public Xavio catalog and create firm checkout quotes.

MCP tools for x402 readiness, paid-path probes, launch packs, and trust receipts.

Forensic FX audit. Detects hidden bank markups in real time. Returns spread bps + audit score 1-10.

World's first independent FX audit MCP. Detects hidden bank fees in 30 seconds.

Self-facilitated x402/MCP payments for hosted endpoints, rail proofs, receipts, and agents.

78 agent APIs with x402 micropayments on Base. USDC settlement.

Thailand Leceipt e-Tax: AI agents create, poll and download e-Tax Invoices, stateless BYO.

Tanzania payments for AI agents — M-Pesa / Tigo Pesa via Flutterwave. Never holds funds.

Romania e-Factura invoices for AI agents: build UBL 2.1 CIUS-RO, upload to ANAF/SPV, query.

Kenya payments for AI agents — M-Pesa via Flutterwave. Never holds funds.

Brazil NFS-e service invoices for AI agents via Focus NFe and NFe.io. Stateless, never stores data.

Nigeria FIRS/NRS MBS e-invoicing for AI agents - validate, sign, confirm invoices (IRN + QR).