x402 Services
| Rank | Service | Category | Chains | Volume · 30d | Transactions · 30d | Buyers |
|---|---|---|---|---|---|---|
| — | HALOWERK spacewerk space.halowerk.com HALOWERK spacewerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet. | AI | Base | $0.00 | 0 | 0 |
| — | Space Weather Intelligence space-weather.use.x402atlas.com !x402 Atlas | Data | Base, Solana | $0.00 | 0 | 0 |
| — | Spark Invocation Assurance spark-api-preflight.replit.app Validates intended paid API requests against declared contracts without calling the target URL. | AI | Base | $0.001 | 1 | 2 |
| — | spark-solana-oracle-production.up.railway.app spark-solana-oracle-production.up.railway.app Detects newly active Solana tokens after prolonged dormancy and returns activation timing and evidence metadata. | Chain infra | Base | $0.00 | 0 | 0 |
| — | SparkPulse spark.lonestaroracle.xyz Wholesale US power prices, volatility and battery-arbitrage signal (CAISO/ERCOT), real-time and day-ahead $/MWh. | Data | Base, Solana | $0.00 | 0 | 0 |
| — | sparky-works.vercel.app sparky-works.vercel.app Provides bounty-truth data through an API. | Data | Base | $0.05 | 1 | 1 |
| — | SpawnXchange Public Agent API spawnxchange.com Public OpenAPI projection for SpawnXchange agent-facing endpoints. Covers discovery, public item detail/status, service health, the direct public x402… | AI | Base | $0.00 | 0 | 0 |
| — | The Speaking Guild Agent Tools API speaking-guild-agent-tools.thespeakingguild.workers.dev A paid x402 API for structured professional communication planning. | AI | Base | $0.00 | 0 | 0 |
| — | SpendPreflight spendpreflight.com Operated by SpendPreflight. Call this BEFORE your agent pays anyone: before settling an x402 402 challenge, before agent checkout, or before sending funds to… | AI | Base | $0.00 | 0 | 0 |
| — | SpendPreflight payee-check.payee-check.workers.dev Spend preflight for AI agents. Send the x402 PaymentRequired body (v1 or v2) you received, or a cart, plus optional rules (per-payment max, hold threshold… | AI | Base | $0.03 | 2 | 1 |
| — | Spreadsheet Modification & Audit sheets.api.williamrobinson.dev Apply cell and named-range edits to an .xlsx, recalculate it with a real spreadsheet engine, and return the modified workbook alongside a dependency-impact… | Other | Base | $0.00 | 0 | 0 |
| — | Spreadsheet References spreadsheet.openverbs.com A1 / R1C1 cell-reference arithmetic — convert A1 references to row/column coordinates and back, translate column letters to indices, and parse A1 ranges into… | Utility | Base | $0.00 | 0 | 0 |
| — | SQLGuard Instant Cert sqlguard.io AI agents need permission before they modify production data. Authorization Receipt + Gateway (invoice primary $299/mo). Wealth Exact: Pilot Challenge POST… | Utility | Base | $0.40 | 4 | 4 |
| — | SQLPermit sqlpermit.schemasure.com SQLPermit parses a candidate statement with PostgreSQL's own grammar (libpg-query, PG 18), walks the syntax tree, and reports whether it complies with the… | AI | Base | $0.00 | 0 | 0 |
| — | SqueezeSignal squeeze.lonestaroracle.xyz Short-squeeze setup signal from short-percent-float, days-to-cover and momentum. Pass ?ticker=. | Data | Base, Solana | $0.00 | 0 | 0 |
| — | SRI sri-test.biz MCP Server Inspector | Other | Base | $0.00 | 0 | 0 |
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