toolgrep / Payments & billing / SpendPreflight
Alternatives to SpendPreflight
SpendPreflight: Trust and verification tools for stablecoin payments, built for AI agents and the people who run them. 8 products similar to SpendPreflight, compared on pricing, free tier, API, MCP server, SDK and open source. 7 of 8 have a free tier, 8 of 8 have an API, 8 of 8 offer an MCP server.
- x402 Preflight
Launch diagnostics for x402 API developers
- Stablecoin Scanner
Onchain dollar telemetry for humans and AI agents
- Settlens
x402 security and testing for agentic payments
- Lumière PayCheck
Trust scores for x402 payment endpoints, checked before an AI agent pays
- 402cron
Scheduled webhook delivery for AI agents, paid per run in USDC on Base via x402
- Agent Tollgate Engine
Pay-per-call market intelligence and fee-bearing swap routing for autonomous trading agents, paid in USDC per request via HTTP 402.
- naxytra
Pay-per-call tools for AI agents with x402 USDC settlement on Base
- agentsvc.io
Pay-per-call API marketplace for AI agents with 127 services settled in USDC via x402
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| SpendPreflight | Usage-based · from 0.001 USDC per check | yes | yes | yes | yes | — |
| x402 Preflight | Freemium | yes | yes | yes | no | no |
| Stablecoin Scanner | Free | yes | yes | yes | no | — |
| Settlens | Usage-based | yes | yes | yes | no | no |
| Lumière PayCheck | Freemium | yes | yes | yes | yes | — |
| 402cron | Usage-based · from $0.0005 per delivery attempt | no | yes | yes | no | no |
| Agent Tollgate Engine | Usage-based | yes | yes | yes | — | — |
| naxytra | Usage-based · from $0.01 USDC per call (Base mainnet); $0.02 for attesting tools; $1.00 = 400 prepaid credits | yes | yes | yes | yes | — |
| agentsvc.io | Usage-based · from $0.002 per call | yes | yes | yes | no | — |
Facts come from each product's own website, or from its verified owner when they have edited the listing. Each product page shows when it was last verified and how it was extracted. Similarity comes from the products' descriptions.
API
curl https://toolgrep.com/api/products/spendpreflight/alternatives