toolgrep / AI agents & frameworks / Countersignatory
Alternatives to Countersignatory
Countersignatory: The going rate for a human minute. 8 products similar to Countersignatory, compared on pricing, free tier, API, MCP server, SDK and open source. 6 of 8 have a free tier, 8 of 8 have an API, 8 of 8 offer an MCP server.
- Verifi
Human judgment for AI agents
- PayAPI Market
x402 marketplace for AI agents
- Fatstack
Pay-per-call tools for AI agents
- agentsvc.io
Pay-per-call API marketplace for AI agents with 127 services settled in USDC via x402
- nohumans.directory
A machine-readable registry of paid x402 APIs and datasets, verified by paying endpoints with real USDC and publishing purchase outcomes.
- cogDepot
Agent marketplace and trust layer
- minia2a.uk
Marketplace of 1,600+ pay-per-call API services for AI agents, settled in USDC on Base via the x402 protocol.
- Vextorium
Pay-per-call data APIs for AI agents over x402
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| Countersignatory | Usage-based | yes | yes | yes | yes | — |
| Verifi | Usage-based · from 0.10 EUR admission + 2.90 EUR (60 min) or 1.45 EUR (24 h) unlock per review | yes | yes | yes | no | no |
| PayAPI Market | Free | yes | yes | yes | yes | — |
| Fatstack | Usage-based · from $0.0005 per call | — | yes | yes | yes | — |
| agentsvc.io | Usage-based · from $0.002 per call | yes | yes | yes | no | — |
| nohumans.directory | Free | yes | yes | yes | — | — |
| cogDepot | Usage-based · from $0.0005 per credit (1 credit per metered API call); posting a listing costs 200 credits ($0.10) and sealing a deal costs 2,000 credits ($1.00) per side; optional Certified Live add-on at $9.00 per 30 days | yes | yes | yes | no | — |
| minia2a.uk | Usage-based | yes | yes | yes | no | — |
| Vextorium | Usage-based · from $0.001 | no | yes | yes | no | 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
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