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Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
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- Paid calls · 30 days
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AI & agents
6 results
SweetAIAI & agentsCheck if an agent's reputation is real: Sybil forensics for one ERC-8004 AI agent — reviewer concentration, ghost reviewers, burst detection. Is this agent's feedback bought? No account, no API key
BaseSolanaPolygon+1sweetai.tiamatcrypto.comfrom $0.00230 endpoints- PPHION InferenceAI & agents
Bounded low-cost inference with a signed delivery receipt
BasePolygonArbitrum+1phion.systemsfrom $0.0017 endpoints - AAgent Arcade: Reasoning GamesAI & agents
Chess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.
BasePolygonArbitrum+1agent-arcade.use.x402atlas.comfrom $0.00510 endpoints - GGridPulseAI & agents
Home battery storage ROI and payback calculator — Powerwall vs alternatives, backup-power value, with the IRA 30% tax credit and state incentives applied. For homeowner and solar agents.
BaseSolanaPolygon+8gridpulse.theaslangroupllc.comfrom $0.0110 endpoints - WWaterPulseAI & agents
Live USGS river-gauge tick, deterministic. Answers "what is the flow at this gauge right now", "is this river high or low vs this week". Returns the latest streamflow (discharge, cfs) and gage height (ft) for one USGS site plus the 7-day min/max range, reading count, site name and coordinates, straight from USGS instantaneous values. Unknown sites 404 before payment. No LLM, no key, public domain.
BaseSolanaPolygon+8waterpulse.theaslangroupllc.comfrom $0.0111 endpoints 
RecallScoutAI & agentsProduct recalls (US): is a product, brand, food, drug, medical device or vehicle (make, model, year) under an active FDA, NHTSA or CPSC recall? Severity on one scale, hazard, remedy and lot codes. RecallScout
BaseArbitrumPolygon+2recallscout.scalpstream.comfrom $0.011 endpoint
Service data comes from the Coinbase CDP and PayAI discovery lists and refreshes every few hours. Usage is paid calls over the last 30 days. APIs launched here are verified by us; the rest are paid directly to their owners.